Chu Qi, Li Jingmeng, Jin Sila, Guo Shuang, Park Eungyeong, Wang Jiku, Chen Lei, Jung Young Mee
College of Chemistry, Jilin Normal University, Siping 136000, China.
School of Public Health and Basic Medicine, The Chinese University of Hong Kong, Hong Kong 999077, China.
Nanomaterials (Basel). 2021 May 14;11(5):1292. doi: 10.3390/nano11051292.
In this paper, an Ag/MoO composite system was cosputtered by Ar plasma bombardment on a polystyrene (PS) colloidal microsphere array. The MoO formed by this method contained abundant oxygen vacancy defects, which provided a channel for charge transfer in the system and compensated for the wide band gap of MoO. Various characterization methods strongly demonstrated the existence of oxygen vacancy defects and detected the properties of oxygen vacancies. 4-Aminothiophenol (p-aminothiophenol, PATP) was used as a candidate surface-enhanced Raman scattering (SERS) probe molecule to evaluate the contribution of the oxygen vacancy defects in the Ag/MoO composite system. Interestingly, oxygen vacancy defects are a kind of charge channel, and their powerful effect is fully reflected in their SERS spectra. Increasing the number of charge channels and increasing the utilization rate of the channels caused the frequency of SERS characteristic peaks to shift. This interesting phenomenon opens up a new horizon for the study of SERS in oxygen-containing semiconductors and provides a powerful reference for the study of PATP.
在本文中，通过氩等离子体轰击在聚苯乙烯（PS）胶体微球阵列上共溅射制备了Ag/MoO复合体系。通过这种方法形成的MoO含有丰富的氧空位缺陷，这些缺陷为体系中的电荷转移提供了通道，并弥补了MoO的宽带隙。各种表征方法有力地证明了氧空位缺陷的存在，并检测了氧空位的性质。4-氨基硫酚（对氨基硫酚，PATP）被用作候选表面增强拉曼散射（SERS）探针分子，以评估Ag/MoO复合体系中氧空位缺陷的作用。有趣的是，氧空位缺陷是一种电荷通道，其强大作用在其SERS光谱中得到充分体现。增加电荷通道数量和提高通道利用率导致SERS特征峰频率发生偏移。这一有趣现象为含氧化合物半导体中SERS的研究开辟了新视野，并为PATP的研究提供了有力参考。
