Abstract
A facile and simple route to manufacture active surface-enhanced Raman scattering (SERS) substrate based on Ag-decorated Cu2O micro/nanospheres on Cu foil was systematically investigated. Hierarchical Cu2O micro/nanostructure transfers from CuO nanosheets and Cu(OH)2 nanowires by means of thermally reducing the oxides from Cu2+ to Cu1+ at temperature of 500 °Cunder nitrogen atmosphere. The subsequent decoration of Ag on Cu2O nanostructural substrate was carried out by means of thermal evaporator deposition. Using 4-aminothiophenol (4-ATP) as probing molecules, the SERS experiments showed that the Ag-decorated Cu2O micro/nanospheres exhibit excellent detecting performance, which could be used as effective SERS substrate for ultrasensitive detection. Additionally, these novel hierarchical SERS substrates showed good reproducibility and a linear dependence between analyte concentrations and intensities, revealing the advantage of this method for easily scale-up production.
Highlights
Surface enhanced Raman scattering (SERS) has drew considerable interest since its discovery and highlighted in the area of biomedicine, physics, environmental monitoring, analytical chemistry, etc
substrate based on Ag-decorated Cu2O micro
The reason is mainly attributed to the electromagnetic mechanism
Summary
Surface enhanced Raman scattering (SERS) has drew considerable interest since its discovery and highlighted in the area of biomedicine, physics, environmental monitoring, analytical chemistry, etc. This is due to the highly enhanced vibrational signals, low detection requirements, and good selectivity for adsorbates [1,2,3]. Study of the synergetic effect from incorporated Ag in Cu2O micro/nanospheres as active SERS substrate is still lacking. A facile and simple route to produce the hierarchical Cu2O micro/nanospheres with the decoration of silver was proposed as highly effective SERS substrate. Our results provide a new opportunity to use SERS to explore the molecule-metal-semiconductor interaction, a fundamental but essential question for designing novel devices
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