储能界的一颗新星——M Xene材料

2012年,二维晶体MXenes（过渡金属的碳化物和氮化物）首次引起研究人员的关注。该材料因具有导电性强、扩散系数低,且单层原子薄片结构的稳定性等性能,可满足高性能电池制备材料的要求。现在,MXenes被赋予更高的期望,因为研究人员发现该类材料具有较好的柔韧性、较高的电容,而且可以容易地制备其复合材料和模压材料。新的发现表明MXenes同样可应用于柔性和可穿戴电子设备,这一特性吸引了越来越多的关注。

Emerging monoelemental 2D materials(Xenes)for biosensor applications

Currently,numerous monoelemental two-dimensional(2D)materials,called Xenes,have been discovered,including graphyne(GD),silicene,germanene,arsenene,borophene.Their structures,fabrication methods,as well as properties have been extensively explored.Based on their single-element composition,high optical response capability,excellent electrical-optical properties,large specific surface area(SSA)and easy modification,Xenes have been widely used in photoelectric applications(detection,modulation,light processing)and biomedicine(biological sensing,drug loading,bioimaging,etc.).Especially in the field of biomedicine,Xenes are expected to induce a great breakthrough.In this review,we introduce the structural characteristics,synthesis and modification methods of several common Xenes respectively.The general properties including optical,electronic,physical and chemical properties of Xenes are summarized.Their diverse utilization as biosensors for nucleic acid sequencing,bioactive detection,cancer diagnosis,etc.are also explicitly explored.Finally,the challenges and future perspectives of Xenes in biosensor are discussed.

Photoelectronic properties and devices of 2D Xenes

Two-dimensional materials,especially graphene-like emerging single-element materials two-dimensional(2D)Xenes,have attracted great research interest since the advent of the graphene.In this review paper,12 kinds of different Xenes were introduced according to the group and element quality,and their main synthesis methods are outlined.The advantages and limitations of the synthesis methods are analyzed in detail.By summarizing the current photoelectronic properties of 2D Xenes materials,it is found that Xenes in the same group have similar properties,such as the buckling properties of the fourth group and the anisotropy of the fifth group.In addition,the performance of photoelectronic applications based on 2D Xenes materials are summarized,and some possible methods are proposed to improve the perfor-mance of future 2D Xenes material photoelectronic devices.

Thermoelectric effect and devices on IVA and VA Xenes

Emerging Xenes,mostly group IVA and VA elemental two-dimensional(2D)materials,have small and tunable band gaps between graphene and transition metal dichalcogenides,giving versatile electrical properties.While their microelectronic or optoelectronic properties are being extensively explored,there remains a lack of study on Xenes'uniquely advantageous thermoelectric performance.This review highlights state-of-the-art experimental and theoretical progress in the thermoelectric effect and devices of IVA and VA Xenes.Vertically displaced,a.k.a.“buckled”or“puckered,”atomic arrays result in exotic and tunable electrical or thermal transport behaviors.Different from chemical doping strategies usually employed in bulk thermoelectric materials,2D Xenes can be tuned by physical means,such as atomic layer control and quantum confinement effects.A precise and compatible platform for 2D thermoelectric effect and devices study is available via the engagement between micro/nanofabrication of 2D Xene transistors and thermal property measurement techniques.This review also reveals potential thermoelectric applications of Xenes and their compounds(Bi2Te3,Bi2Se3,etc.),such as accurate stretchable temperature sensors,fast terahertz photodetectors,and so on.

高分子担载苯丙氨酸希夫碱钴配合物催化氧化环己烯研究

研究了高分子担载苯丙氨酸水杨醛希夫碱配合物(PS-Sal-Phe-M)催化氧化环己烯的性能,探讨了高分子担载苯丙氨酸水杨醛希夫碱钴配合物(PS-Sal-Phe-Co)在不同反应条件下催化氧化环己烯的反应性能,找到了高分子担载苯丙氨酸水杨醛希夫碱钴配合物催化氧化环己烯的较好反应条件。