With the proposal of "peak carbon dioxide emissions" and "carbon neutral" strategic objectives, developing clean energy and promoting the development of new energy industry has become the consensus of the whole society. Lithium battery as the candidate for new generation of energy storage equipment due to its remarkable advantages such as high energy density, high power density, long cycle life and environmental friendliness. Its development plays a significant role in alleviating energy crisis, driving the conversion of old kinetic energy into new and achieving the strategic goal of "carbon peaking and carbon neutrality". In order to further improve the energy density of lithium batteries, the most effective strategy is to use high voltage or high specific capacity cathode materials. However, due to the low oxidation stability and narrow electrochemical window of traditional carbonate ester electrolytes, they are prone to oxidative decomposition when the working voltage exceeds 4.2 V, which cannot be cycled stably at high voltages, so it is particularly important to broaden the electrochemical window of electrolytes. This paper mainly discusses the mechanism of organic solvents and additives in high-voltage electrolytes, explores effective methods to broaden the electrochemical window of new electrolytes, summarizes the characteristics of aqueous electrolytes, solid electrolytes, and polymer gel electrolytes, and finally; summarizes and outlooks the future development and prospects of high-voltage electrolytes to provide scientific basis for the design and development of high-voltage electrolytes for lithium batteries.

Carbon dots (CDs), with particle size less than 10 nm, are a new type of zero-dimensional photoluminescence nanomaterials. Due to the obvious advantages of adjustable fluorescence emission and excitation wavelength, light stability, low toxicity, good water solubility and biocompatibility, etc., CDs have been widely researched in recent years. As a treasure of ancient Chinese science, Traditional Chinese medicine (TCM) is rich in various active ingredients and plays a variety of pharmacodynamic effects, which has been used for thousands of years. TCM-CDs prepared with TCM as carbon source can create some special functions, and then may play a greater medicinal value. In this paper, the synthesis of TCM-CDs and its application in biological imaging and medical therapy are reviewed. Firstly, different synthetic methods of TCM-CDs (including hydrothermal, pyrolysis, solvothermal and microwave assisted method) are introduced in detail, and their advantages and disadvantages are compared. Subsequently, the latest research on TCM-CDs in biological imaging and medical treatment is comprehensively analyzed. This paper focuses on the application of imaging different types of cells in vitro and the distribution and uptake of TCM-CDs guided by imaging in vivo (mice, zebrafish, etc.). In addition, the intrinsic pharmacological activities of these TCM-CDs (including antibacterial, anti-inflammatory, hemostatic, antioxidant and anticancer, etc.) and their mechanisms are also discussed in order to improve and promote their clinical application. Finally, the importance of TCM-CDs research, the main problems and challenges in this fields and the future development direction are summarized and outlooked.

Metal-organic frameworks (MOFs) are a new generation of crystalline porous materials with void space structures constructed from metal ions or clusters and organic ligands through coordination bonds, and have been a hot research topic in the field of coordination chemistry over the past two decades. As the novel multifunctional materials, MOFs have been widely used in various fields due to their high porosities, low densities, large surface areas, tunable pore sizes, diverse topological structures and tailorabilities. Although MOFs have many advantages, most of MOFs materials have relatively lower water and chemical stability and cannot maintain their structures under harsh conditions, which greatly restrict their practical applications under moisture-rich conditions. Therefore, chemically stable MOFs materials will have greater application prospects. In recent years, researchers have carried out a lot of exploration in improving the chemical stability of MOFs, and developed some excellent methods to synthesize chemically stable MOFs. This review will mainly focus on the latest research progress in the syntheses of chemically stable MOFs during the past five years.

Polyurethane, a prevalent polymer, has garnered considerable attention owing to its exceptional overall performance within various applications. However, even minor damages can significantly curtail the service life of polyurethane. Consequently, a promising approach to address this challenge involves conferring self-healing properties upon polyurethane. Among the various healing mechanisms found in self-healing polyurethane, the intrinsic driving force stands out as the most common. This mechanism entails the spontaneous re-entanglement of polyurethane molecular chains through meticulous molecular structure design, obviating the necessity for external healing agents. Intrinsic driving force encompasses reversible covalent bonds (e.g., disulfide bonds, Diels-Alder reactions, and boronic ester bonds) as well as dynamic non-covalent interactions (e.g., hydrogen bonds, ionic bonds, metal coordination bonds, and host-guest interactions). The polyurethane main chain can possess a single intrinsic driving force or multiple intrinsic driving forces concurrently. Nevertheless, while self-healing polyurethane alone presents advantages in terms of extending service life and reducing maintenance costs through damage repair, it still falls short of meeting the usage requirements in certain specialized applications. To further enable the versatile application of self-healing polyurethane while preserving its self-healing properties, the incorporation of new functional groups becomes an enticing prospect. These functional groups can bestow specific properties upon polyurethane, such as shape memory, degradability, antibacterial properties and biocompatibility, thereby achieving functional integration within self-healing polyurethane. Importantly, these functionalized self-healing polyurethanes possess the potential to supplant traditional materials as dielectric materials, substrate materials, or encapsulation materials in the realm of flexible sensors. Consequently, they contribute to enhancing the reliability and durability of flexible sensors. Therefore, this article primarily focuses on elucidating the self-healing mechanism of self-healing polyurethane. Subsequently, it delves into the integration of functionality within self-healing polyurethane and its application within the field of flexible sensors. Lastly, based on these insights, the paper provides a glimpse into the future prospects for the development of self-healing polyurethane.

Double Network Hydrogels are polymer materials composed of two interpenetrating or semi-penetrating three-dimensional networks, and their unique contrast interpenetrating network structure and adjustable network crosslinking method overcome the obstacles in mechanical properties of single-network hydrogels, and are widely used in tissue engineering, intelligent sensors, ion adsorption and other fields with their good mechanical, anti-swelling, self-healing and other mechanical properties. However, the existing technologies suffer from numerous synthesis steps, complicated preparation conditions and the use of toxic and harmful chemical cross-linking, which limit the mass production of double network hydrogels for applications. Therefore, in recent years, the modification of double network hydrogels has received more and more attention, and researchers have carried out a series of structural modification studies mainly around how to improve the mechanical properties of double network hydrogels, aiming to broaden their application in various fields. In this paper, the types of double network hydrogels are reviewed, and the preparation methods, structures and unique properties of different hydrogels are introduced in detail. The research on modification to improve mechanical properties, anti-swelling performance and self-healing properties is analyzed, aiming to break through the current limitations of double network hydrogels and provide ideas and directions for their future development.

In recent years, with the development and popularization of Internet and artificial intelligence, the flexible pressure sensor with light, convenience and excellent electronic performance, as the core device of wearable electronic equipment, has a increasingly broad market. Flexible pressure sensors have attracted extensive attention in electronic skin, motion detection, medical monitoring and man-machine interface because of its flexibility, folding and excellent sensing performance. The construction of micro-nano structures is the key to improve the sensitivity and sensing performance of pressure sensors. Based on this, the sensing mechanism (piezoresistive, capacitive, piezoelectric, triboelectric) and key performance parameters (sensitivity, pressure response range, detection limit, response/recovery time, stability of circulation and linearity, etc.) of the high-sensitivity pressure sensors were summarized. Then, research progress of flexible pressure sensors using substrates to construct surface micro-nano structures (micro-convex structure, bramble structure and fold structure) and using conductive materials to construct micro-nano structures (micro-sphere structure, urchin structure and cellular structure) were compared and concluded. Furthermore, the application status of high-sensitivity flexible pressure sensors based on micro-nano structure in pulse detection, electronic skin, motion detection and man-machine interface was concluded. Finally, from the perspective of future application, the challenges and development direction of high sensitivity flexible pressure sensor are summarized.

Prussian blue (PB) and its analogues (PBAs), which are composed of three-dimensional frame structure, are ideal cathode materials for sodium ion battery (SIB) and can provide a wide channel for sodium ion embedding and removal. However, there are a lot of water molecules and vacancies in PBAs materials, which greatly reduces the storage sites of sodium ions. Furthermore, transition metal ions in the metal organic framework are easy to dissolve during the cycles, resulting in limited sodium storage capacity and poor cycle stability of PBAs cathode materials. In recent years, a variety of PBAs modification technologies have been developed to improve their sodium storage performance. Based on recent related work and existing literature reports, this paper summarizes the process design, preparation methods, electrochemical behavior and other aspects of different modification technologies, and systematically reviews and prospects the research progress of various modification technologies of PBAs cathode materials in sodium ion batteries.

Nanomaterial features a high surface area-to-volume ratio and strong surface effects, offering excellent performance in water treatment and broad application prospects. Incorporating nanoparticles into millimeter-scale hosts to prepare millimeter-sized nanocomposite materials can couple the high reactivity of nanoparticles with the easy operability of millimeter-scale hosts. This is an important technical approach to overcome the engineering application bottlenecks of nanomaterials, such as their tendency to agglomerate, low stability, potential environmental risks, and difficult separation. This review summarizes the preparation methods, structural characteristics, and adsorptive and catalytic oxidative removal of pollutants from aqueous systems by millimeter-sized nanocomposites. It elaborates on the confinement effects from the perspectives of confined growth of nanoparticles, confined adsorption properties, and confined catalytic oxidation properties, as well as the synergistic purification effect between the hosts and nanoparticles. Finally, the scientific issues and practical challenges that urgently need to be addressed in the development of millimeter-sized nanocomposites are discussed. We believe this review will provide theoretical guidance and technical references for promoting the practical applications of nanomaterials.

In recent years, organo-metal halide perovskites materials with ABX₃ crystal structure have shown promising application prospects in the field of photoelectric detection due to their optical and electrical properties such as adjustable bandgap engineering, high absorption coefficient and long carrier transmission distance. Especially, the hybrid perovskite prepared by pure Sn or Sn/Pb mixed cations have excellent near-infrared photoelectroresponse in the range of 760~1050 nm, showing many advantages such as high sensitivity, low dark current and high detection rate. To further broaden the near-infrared and infrared response wavelength range of perovskite, the researchers explored combining organic materials, crystalline silicon/germanium, Ⅲ-Ⅴ compounds, Ⅳ-Ⅵ compounds, upconversion fluorescent materials as complementary light absorption layers with perovskite to prepare heterostructures to construct wide-spectrum response near-infrared photodetectors. Based on the above research, this paper summarizes the current effective ways to broaden the spectrum range of perovskite photodetectors. At the same time, the future development prospect of perovskite material near infrared photodetector is prospected.

Contents

1 Introduction

2 Basic indicators of photodetectors

2.1 Device structure and working principle of photodetectors

2.2 Performance parameters of photodetectors

2.3 Strategy of broadening the spectrum response range of perovskites

3 Pb perovskite for near-infrared photodetectors

3.1 Polycrystalline perovskite materials

3.2 Single crystal perovskite materials

4 Narrow band gap Sn and Sn/Pb Mixed Perovskite- Based near-infrared photodetectors

4.1 Sn-based perovskite near-infrared photodetectors

4.2 Sn/Pb mixed perovskite near-infrared photodetectors

5 Perovskite/inorganic heterojunction near-infrared photodetectors

5.1 Silicon and other classic semiconductors

5.2 Graphene

5.3 Transition metal dichalcogenides

5.4 Ⅲ-Ⅴ compounds semiconductors

5.5 Ⅳ-Ⅳ compounds semiconductors

6 Perovskite/organic heterojunction near-infrared photodetectors

7 Perovskite/upconversion material near-infrared photodetectors

8 Application of near-infrared photodetectors

9 Conclusion and outlook

The optoelectronic properties of organic luminescent materials are strongly correlated with the molecular structure, the flexibility of conformational change and the intermolecular interaction. From the perspective of structure, the carbonyl group and benzene ring of benzophenone have high chemical modifiability. In this paper, the chemical synthesis methods to produce multifunctional organic luminescent materials based on benzophenone framework in recent years are systematically reviewed, including three basic strategies: multiple substitution of benzophenone, using heteroatom as bridging group, vinyl coupling and direct coupling of benzene ring as the center. A variety of multifunctional organic luminescent materials based on this framework have been developed, including fluorescence materials, hosts of precious metal phosphorescence complex, thermally activated delayed fluorescence materials, aggregation-induced emission materials and pure organic room temperature phosphorescence materials. Finally, the development prospect of multi-functional organic luminescent materials based on benzophenone framework is prospected.

Pervaporation is a membrane separation technology with the advantages of low energy consumption and easy operation. At present, the traditional polymer pervaporation membrane still lacks in separation performance and stability. Metal-organic framework (MOF) is a crystalline porous material formed by self-assembly of metal ions and organic ligands. It has unique properties such as selective adsorption of target molecules and molecular sieving effect. In recent years, many studies have shown that the introduction of MOF as a filler into the polymer matrix to construct mixed matrix membranes (MMMs) has a good effect on its pervaporation performance. Starting from different series of MOF, this paper discusses the types of MOF suitable for pervaporation mixed matrix membrane, analyzes the preparation methods and modification strategies of MOF-polymer mixed matrix membrane, and reviews the application progress of this kind of mixed matrix membrane in pervaporation (dehydration of organic solvent, recovery of organic matter from dilute solution, separation of organic mixture). The challenges in the research of MOF-polymer mixed matrix membrane for pervaporation are summarized, and its future development is prospected.

Sodium-ion batteries have attracted ever-increasing attention in the fields of low-speed electric vehicles, and large-scale energy storage systems due to the advantages of abundant resources, low cost, high safety, and environmental friendliness. As one of the important components of sodium-ion batteries, the electrolyte is responsible for ion transfer between the cathode and the anode, which has a significant impact on cycle life, high-rate, safety, and self-discharge performance of sodium-ion batteries. However, it is difficult for sodium-ion batteries to perform well at low temperatures due to the decrease in ionic conductivity, the poor compatibility between the electrolyte and the electrode, the increase of desolvating power, and the poor properties of the electrode/electrolyte interphase. In this paper, the new understanding of the Na⁺ solvation structure in the electrolyte and the electrode/electrolyte interphase in recent years are summarized. And the design strategies of low-temperature electrolyte based on H-bond network breakdown, weak solvation, rapid reaction kinetics, and anion intervention are systematically analyzed. Finally, it is pointed out that the key to improving the low-temperature performance of sodium-ion batteries from the perspective of electrolyte is to understand the relationship between the Na⁺ solvation structure, the electrode/electrolyte interface properties, and the low-temperature performance of electrolyte.

Owing to its vast surface area and remarkable electrical conductivity, graphene has attracted extensive attention in the realm of electrochemical energy storage. Nevertheless, its volumetric energy density as an electrode material is quite low, thus presenting certain difficulties in its application as an electrode material. Heteroatom doping is a viable approach to enhance the electrochemical properties of graphene, thereby augmenting the energy storage capability of graphene as an electrode material. This paper provides a summary of the preparation of heteroatom-doped graphene, examines how heteroatom doping affects graphene’s electrochemical properties, explores the application of graphene in supercapacitors, and finally looks ahead to the future development course of this research domain.

All solid-state sodium batteries have great potential for portable electronics, electric vehicles, and large-scale energy storage applications due to the low cost of sodium, high security, and high energy density. However, the development and large-scale application of all-solid-state sodium ion batteries urgently need to solve the problems such as low ion conductivity of solid electrolyte, high charge-transfer impedance on interface, insufficient interfacial contact, and compatibility issues between electrodes and electrolytes solid electrolyte. Herein, combining the latest reports with our research findings, the research progress and development trend of β-Al₂O₃ electrolytes, NASICON electrolytes, sulfide electrolytes, polymer electrolytes, and composite electrolytes were summarized. The latest achievements in interface characteristics, the modification strategies of the interface between the electrodes and solid electrolytes and modification methods for surfaces of solid electrolytes were reviewed. Finally, the development direction of interface modification strategy for solid-state sodium ion batteries was prospected. This review have contributed to understand the interface science issues of all solid-state sodium ion batteries and provides a theoretical guidance for the development and application of solid-state sodium ion batteries.

As a kind of metal-organic framework (MOF) with high valence, titanium-based metal-organic framework (Ti-MOF) has superior chemical stability, appealing photoresponsive properties, low toxicity and so on. However, due to the high reactivity of titanium sources, it brings certain challenges to the synthesis of materials. In this paper, the research progress of Ti-MOF synthesis in recent years is reviewed, and the solvothermal synthesis, post-synthetic modification and in situ SBUs construction methods are introduced in detail. The topological types and crystal structures formed are analyzed, and the synthesis rules of Ti-MOF and the advantages and disadvantages of various methods are summarized. It is pointed out that the control of the metal source and coordination environment is the most important strategy to obtain Ti-MOF, and the construction of Ti-MOF by in-situ formation of SBUs and heterometallic Ti/M-MOF are prospected.

Silver nanomaterials have been widely used in catalysis, medicine, environment and other fields due to their high catalytic activity, fine biocompatibility, unique physical and chemical properties. This review first introduced the species, properties and synthetic strategy of silver nanomaterials, summarized controllable synthesis method in detail, and discussed the new achievements of machine learning in the synthesis of silver nanomaterials. Then, we reviewed the applications of silver nanomaterials in the environment such as pollutant removal, sterilization and virus inactivation, sensor and so on. Based on this, the species, controlled synthesis and environmental applications of silver nanomaterials were reviewed and prospected in this paper.

Enzymes are considered as natural biocatalysts, which catalyze many biochemical reactions with good catalytic efficiency, biocompatibility, and substrate specificity. The intrinsic limitations of natural enzymes such as low stability, high cost, and storage difficulty have led to the introduction of artificial enzymes that imitate the activity of natural enzymes. With the rapid development of nanomaterials in the recent decade, novel enzyme-mimicking nanomaterials (nanozymes) have attracted considerable attention from researchers. Nanozymes are defined as a class of artificial nanomaterials possessing intrinsic enzymes-like activities, which have the advantages of simple preparation processes, low cost and some environmental tolerance. However, most of them are limited by their low activity and relatively poor stability, leading to many difficulties in the application of biochemical analysis. Among them, metal-organic framework nanozymes (MOFs) have demonstrated a wide range of uses because of their evident favorable circumstances, including the large surface area and porosity for functionalization, uniform active sites, high catalytic activity and stability, simple and controllable synthesis and low cost. In this review, we provide a summary of the clinical detection application of MOFs in nucleic acid, protein and small molecules based on their different activity classification (peroxidase, oxidase, catalase, superoxide dismutase, and hydrolase). Finally, we look forward to the opportunities and challenges that MOFs will face in clinical detection, promoting their clinical application transformation.

Heat dissipation has emerged as a critical challenge and technical bottleneck which is increasingly restricting the continuous miniaturization of large-power and ultrahigh frequency microelectronic devices and high-voltage electrical insulation equipment. High-performance heat conductive materials are highly desirable for effective thermal management. Compared with conventional heat conductive polymeric composites, the intrinsically thermal conductive polymers have gained extensive research and attention from domestic and overseas owing to their integrated excellent overall properties like high thermal conductivity and high dielectric breakdown strength, excellent flexibility, lightweight and high strength, etc. The present paper first discusses the heat conduction mechanisms in intrinsic polymers, and then systematically analyzes and reviews the following factors influencing phonon transport and polymers’ thermal conductivity: the structures from monomers and molecular chains with diverse scales, crystallinity, orientation, inter-chain interactions, crosslinking, structure defects, as well as temperature, pressure, environmental factors, etc. Further, the strategies to prepare high thermal conductivity polymers have been summarized. Finally, this paper sums up the existing questions and challenges ahead in the study of thermal conductive polymers, and points out their future research direction and prospects potential important applications in various industrial occasions.

Due to the excellent optical properties, good biocompatibility, high reactive oxygen species yield and excellent photothermal conversion ability, aggregation-induced emission (AIE) materials show great potential applications in the fields of photodynamic and photothermal therapy. However, traditional fluorescent materials need light with short wavelength for emission, which has the problem of poor tissue penetration, and further restricts the clinical application. To overcome the problem, AIE materials with emission in the range of second near-infrared (NIR-Ⅱ) emission are employed, which promotes the feasibility of the clinical application. This review summarizes the application of NIR-Ⅱ AIEgens with donor-π-acceptor (D-π-A) and donor-acceptor-donor (D-A-D) structure in photodynamic-photothermal dual-mode synergistic therapy.

With the development of the nuclear industry, radioactive iodine was identified as one of the most hazardous nuclear wastes. Radioactive iodine capture also plays an important role in reducing the contamination of nuclear wastewater. Covalent organic frameworks (COFs), a crystalline porous organic material formed by covalent bond connection, are considered an ideal candidate for iodine capture materials for their large specific surface area, regular pore structure and high chemical stability. COFs are considered as ideal iodine trapping materials due to their structural characteristics and the fact that the adsorption sites of COFs are easily occupied by iodine molecules. This paper mainly reviews the progress of COFs with periodic porous structure and tunable functions in the field of iodine capture. Firstly, the recent progress in iodine capture of imine bonded COFs was briefly reviewed. Secondly, iodine capture capacity of compound COFs and ionic COFs are discussed. Finally, the potential of efficient iodine capture COFs to scale and the future development of this field.