Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Ministry of Education, College of Chemistry, Jilin Normal University, Changchun 130103, PR China.
Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, South Korea.
Spectrochim Acta A Mol Biomol Spectrosc. 2022 Oct 15;279:121405. doi: 10.1016/j.saa.2022.121405. Epub 2022 May 18.
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.
采用共溅射技术成功制备了聚苯乙烯（PS）阵列上包覆的 Ag-ZnX（X=O、S、Se）复合材料（Ag-ZnO@PS、Ag-ZnS@PS、Ag-ZnSe@PS）。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 之间的电子重新分布所致。因此，Ag 的载流子密度降低，Ag 的表面等离子体共振（SPR）在 Ag-ZnX 复合材料中红移。由于 Ag 的 SPR 红移导致 Ag 的 SPR 对表面增强拉曼散射（SERS）的贡献很高，因此随着 Ag-ZnX 复合材料中载流子密度的增加，SPR 和电荷转移（CT）的贡献同时增加。本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。对载流子密度的调节将有助于理解 SPR 和 CT 的贡献。
