CAJ | 학술논문

石墨烯是近年来人们发现和合成的一种新型二维平面纳米材料,由于其优良的导电性能和巨大的比表面积,研究者们用石墨烯与光催化材料复合,改善其光催化性能,这已成为新型光催化材料的研究热点之一。本文阐述了近年来国内外对于石墨烯在光催化反应中应用的研究动态和主要成果,分析了影响半导体材料光催化效率的5个因素,即禁带宽度、能带位置、激发电子-空穴复合概率、光催化剂结晶性和光催化剂吸附性能。介绍了石墨烯提高光催化效率的方法,重点介绍了石墨烯在复合、包覆和自身参与光催化反应3个方法中的具体应用,提出通过石墨烯与某些特定的光催化材料复合而改变其禁带宽度,可为今后通过石墨烯调节其它半导体材料的禁带宽度提供有力的理论和实验依据。
석묵희시근년래인문발현화합성적일충신형이유평면납미재료,유우기우량적도전성능화거대적비표면적,연구자문용석묵희여광최화재료복합,개선기광최화성능,저이성위신형광최화재료적연구열점지일。본문천술료근년래국내외대우석묵희재광최화반응중응용적연구동태화주요성과,분석료영향반도체재료광최화효솔적5개인소,즉금대관도、능대위치、격발전자-공혈복합개솔、광최화제결정성화광최화제흡부성능。개소료석묵희제고광최화효솔적방법,중점개소료석묵희재복합、포복화자신삼여광최화반응3개방법중적구체응용,제출통과석묵희여모사특정적광최화재료복합이개변기금대관도,가위금후통과석묵희조절기타반도체재료적금대관도제공유력적이론화실험의거。
Graphene,an atomic thick nanosheet of covalently organized two-dimensional lattice of sp2 bonded carbon atoms,has recently received tremendous attention as a hot point in the field of new photocatalytic materials.Of particular interest is its efficient charge conductivity in electron-transfer process and large theoretical specific surface area.Thus,graphene has been seen as an ideal substituent of carbon nanotubes with photocatalysts to improve photocatalytic performance.Herein the research achievements on photocatalytic reactions based on grapheme are reviewed.Five factors impacting the photocatalytic efficiency of semiconductors are first analyzed.They are the bandgap,the position of the energy band,the recombination probability of the excited electon/hole pair,the crystallinity of the photocatalyts and the absoptive capacity of the photocatalyts.Then,the fundamental mechanism of enhanced photocatalytic activity is discussed,and the advance in compositing method,coating method,and self-photocatalytic reactions of grapheme to adjust the bandgap of the photocatalyts is summarized.At the end,the evidence from both theory and experiment of regulating the bandgap is presented.