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Evaluation of SERS activity for cosputtered Ag-ZnX@PS (X = O, S, Se) composites: Carrier density dependence
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.4 ) Pub Date : 2022-05-18 , DOI: 10.1016/j.saa.2022.121405
Chenghao Tang 1 , Eungyeong Park 2 , Shuang Guo 2 , Sila Jin 3 , Lina Zhao 1 , Lei Chen 1 , Young Mee Jung 4
Affiliation  

Ag-ZnX (X = O, S, Se) composites coated on polystyrene (PS) arrays (Ag-ZnO@PS, Ag-ZnS@PS, Ag-ZnSe@PS) were successfully fabricated by using cosputtering technology. We found that ZnX doping decreased the carrier densities of these composites compared to that of pure Ag@PS, which was due to redistribution of electrons between Ag and ZnX. Thus, the carrier density of Ag was decreased, and the surface plasmon resonance (SPR) of Ag was redshifted in the Ag-ZnX composites. As the redshift of the SPR of Ag induced a high SPR contribution to the surface-enhanced Raman scattering (SERS), the SPR and charge transfer (CT) contributions were simultaneously increased with increasing carrier density in the Ag-ZnX composites. This study opens a new path to designing metal–semiconductor composites with controllable carrier density. Regulation of the carrier density will be of great help in understanding SPR and CT contributions.



中文翻译:

共溅射 Ag-ZnX@PS (X = O, S, Se) 复合材料的 SERS 活性评估:载流子密度依赖性

采用共溅射技术成功制备了涂覆在聚苯乙烯(PS)阵列(Ag-ZnO@PS、Ag-ZnS@PS、Ag-ZnSe@PS)上的 Ag-ZnX(X = O、S、Se)复合材料。我们发现,与纯 Ag@PS 相比,ZnX 掺杂降低了这些复合材料的载流子密度,这是由于 Ag 和 ZnX 之间电子的重新分布。因此,Ag 的载流子密度降低,Ag 的表面等离子共振 (SPR) 在 Ag-ZnX 复合材料中发生红移。由于 Ag 的 SPR 的红移导致 SPR 对表面增强拉曼散射 (SERS) 的贡献很大,因此 SPR 和电荷转移 (CT) 的贡献随着 Ag-ZnX 复合材料中载流子密度的增加而同时增加。这项研究为设计具有可控载流子密度的金属-半导体复合材料开辟了一条新途径。

更新日期:2022-05-18
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