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 shu

A new semiconductor-based SERS substrate with enhanced charge collection and improved carrier separation: CuO/TiO₂ p-n heterojunction

Dongxue Yu ^a ,
Lin Xu ^a ,
Huizhu Zhang ^a ,
Jia Li ^a ,
Weie Wang ^a ,
Libin Yang ^a, ,
Xin Jiang ^a, ,
Bing Zhao ^b,

a.
College of Materials Science and Engineering, College of Pharmacy, Jiamusi University, Jiamusi 154007, China
b.
State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China

Received Date: 30 June 2022
Revised Date: 22 July 2022
Accepted Date: 20 August 2022
Available Online: 23 August 2022

Figures(3)

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.
- SERS,
- CuO/TiO₂ heterojunction,
- Photo-induced charge transfer,
- Semiconductor substrate,
- Charge collection,
- Carrier separation
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

A new semiconductor-based SERS substrate with enhanced charge collection and improved carrier separation: CuO/TiO2 p-n heterojunction

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通讯作者: 陈斌, bchen63@163.com

A new semiconductor-based SERS substrate with enhanced charge collection and improved carrier separation: CuO/TiO₂ p-n heterojunction