材料科学
气凝胶
拉曼散射
半导体
基质(水族馆)
纳米材料
纳米技术
吸附
拉曼光谱
光电子学
光学
海洋学
物理
化学
有机化学
地质学
作者
Wei Liu,Zihan Wang,Xiaoning Tang,Zhongping Liu,Yi–Ming Xiong,Xin Zhou,Guoxiang Zhu,Zhiyang Zhao,Wenqian Yan,Lingyan Shi,Longjin Huang,Yu Liu,Sheng Cui,Xuan He
标识
DOI:10.1002/adom.202300730
摘要
Abstract Recent advances in surface‐enhanced Raman scattering (SERS) on semiconductor substrates offer this technology improved selectivity on top of other advantages, such as cost efficiency. However, the enhancement factor (EF) based on the semiconductors is still low compared with the noble metal substrates. Here, a new strategy of developing the semiconductor substrates based on aerogels is proposed for the first time. According to the modified Herzberg–Teller coupling rule, TiO 2 aerogels are selected as the control object because of their large tunability. The surface area, amorphousness, and surface oxygen vacancy densities of TiO 2 aerogels are regulated synergically. Due to the tuning of band structure, including band gap and defect band, multiresonant interband charge transfer (CT) pathways are generated and enhanced CT efficiency. A strong, intrinsically activated SERS effect is generated. Amorphous TiO 2 aerogel with the highest surface oxygen vacancies shows a significant EF of 2.42 × 10 7 , and TiO 2 aerogels afford the large surface area and more active sites, which is conducive to promoting the adsorption of molecules. The aerogel‐based SERS is demonstrated to have wide applicability for ultrasensitive detection of explosives and organic dyes. The aerogel nanomaterials demonstrated here open a way for the construction of low‐cost and high‐sensitivity SERS substrate materials.
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