Citation: Dongxue Yu, Lin Xu, Huizhu Zhang, Jia Li, Weie Wang, Libin Yang, Xin Jiang, Bing Zhao. A new semiconductor-based SERS substrate with enhanced charge collection and improved carrier separation: CuO/TiO2 p-n heterojunction[J]. Chinese Chemical Letters, ;2023, 34(7): 107771. doi: 10.1016/j.cclet.2022.107771
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In this paper, CuO/TiO2 p-n heterojunction was developed as a new surface enhanced Raman scattering (SERS) substrate to magnify Raman signal of 4-mercaptobenzoic acid (4-MBA) molecule. In the heterojunction-molecule system, CuO as an "electron capsule" can not only offer more electrons to inject into the surface state energy level of TiO2 and consequently bring additional charge transfer, but also improve photogenerated carrier separation efficiency itself due to strong interfacial coupling in the interface of heterojunction, which together boost SERS performance of the heterojunction substrate. As expected, owing to the enhanced charge collection capacity and the improvement of photogenerated carrier separation efficiency derived from internal electric field and strong interface coupling provided in the interface of heterojunction, this substrate exhibits excellent SERS detection sensitivity towards 4-MBA, with a detection limit as low as 1 × 10−10 mol/L and an enhancement factor of 8.87 × 106.
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