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Title: Direct experimental observation of facet‐dependent SERS of Cu2O polyhedra
Authors: Lin, Jie
Hao, Wei
Shang, Yang
Wang, Xiaotian
Qiu, Dengli
Ma, Guanshui
Chen, Chao
Li, Shuzhou
Guo, Lin
Keywords: Engineering::Materials
Issue Date: 2017
Source: Lin, J., Hao, W., Shang, Y., Wang, X., Qiu, D., Ma, G., . . . Guo, L. (2018). Direct experimental observation of facet‐dependent SERS of Cu2O polyhedra. Small, 14(8), 1703274-. doi:10.1002/smll.201703274
Journal: Small
Abstract: Semiconductor-based surface enhanced Raman scattering (SERS) has attracted great attention due to its excellent spectral reproducibility, high uniformity, and good anti-interference ability. However, its relatively low SERS sensitivity still hinders its further developments in both performance and applications. Since the SERS is a peculiar surface effect, investigating the facet-dependent SERS activity of semiconductor nanostructures is crucial to boost their SERS signals. Although the semiconductor facet-dependent SERS effect is predicted via numerical calculations, convincing experimental evidence is scarce due to complicated and undefined surface conditions. In this work, three facet-defined ({100}, {110}, and {111} facets) Cu2 O microcrystals (MCs) with clear surface atomic configuration are utilized to investigate the facet-dependent SERS effect. The results from the Kelvin probe force microscopy measurements on single Cu2 O polyhedron, demonstrate that the facet-dependent work function plays a crucial role in the interfacial charge transfer process. Comparing with the {110} and {111} facets, the {100} facet possesses the lowest electronic work function, which enables more efficient interfacial charge transfer. The simulation results further confirm that the {100}-facets can transfer the most electrons from Cu2 O MCs to molecules due to its lowest facet work function, resulting in the largest increment of the molecular polarization.
ISSN: 1613-6810
DOI: 10.1002/smll.201703274
Rights: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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