分子自组装薄膜调控MoS_(2)/TiO_(2)的光致发光性质的研究  

Tuning the photoluminescence of MoS_(2)/TiO_(2)by molecular selfassembly films

作　　者：查何辰宇 邢月 项苗苗 邵翔[1] Hechenyu Zha;Yue Xing;Miaomiao Xiang;Xiang Shao(Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学化学物理系,安徽合肥230026

出　　处：《中国科学技术大学学报》2023年第12期39-46,I0006,I0010,共10页JUSTC

基　　金：supported by the National Natural Science Foundation of China(22172152,21872130);the National Key Research and Development Program of China(2021YFA1502801).

摘　　要：自组装薄膜是一种修饰材料表面、使之功能化的有效方法。本文初步探讨了10,12-二十五二炔酸(PCDA)自组装薄膜对生长在金红石型二氧化钛(r-TiO_(2))(110)单晶表面的单层二硫化钼(MoS_(2))光学性能的调节作用。我们通过原子力显微镜(AFM)表征发现,PCDA分子在MoS_(2)/TiO_(2)表面自组装成与在纯MoS_(2)表面相同的片状结构,并在紫外光(UV)照射下进一步聚合成共轭的导电聚二乙炔(PDA)链。在光致发光(PL)测量中观察到,PCDA组装薄膜的添加及其进一步光致聚合,会导致MoS_(2)中的负A激子(A−)发光逐步增加,而总发光强度逐渐下降,表明PCDA的组装及其聚合产物相对于MoS_(2)具有不同的电子给予性。这些结果加深了我们对多组分系统中界面相互作用的理解,同时也证明了自组装薄膜是调整二维材料复合体系的电子与光学特性的一种有效策略。Self-assembly films have demonstrated an efficient method to functionalize the surfaces of variously different materials.In this work,we preliminarily explored the modification effect of 10,12-pentacosadiynoic acid(PCDA)on the optical properties of monolayer molybdenum disulfide(MoS_(2))grown on a rutile titanium dioxide(r-TiO_(2))(110)single crystal surface.Atomic force microscopy(AFM)characterizations directly revealed that the PCDA molecules selfassemble into the same lamella structure as on pure MoS_(2),which can be further polymerized into conductive polydiacetylene(PDA)chains under ultraviolet light(UV)irradiation.Detailed photoluminescence(PL)measurements observed clearly increased luminescence of negative trions(A−)yet decreased total intensities for MoS_(2)upon adding the PCDA assembly,which is further enhanced after stimulating its polymerization.These results indicate that the PCDA assembly and its polymerization have different electron donability to MoS_(2),which hence provides a deepened understanding of the interfacial interactions within a multicomponent system.Our work also demonstrates the self-assembly of films as a versatile strategy to tune the electronic/optical properties of hybridized two-dimensional materials.

关 键 词：10 12-二十五二炔酸 MoS_(2)/TiO_(2) 自组装 光致聚合 光致发光 

分 类 号：O644.1[理学—物理化学]