Abstract
A facile hydrothermal method was employed to synthesize silver–reduced graphene oxide (Ag/rGO) plasmon-modified SnO2 composite, by incorporating Ag–reduced graphene oxide (Ag/rGO) into SnO2 nanorods as a photoanode for assembling a self-powered ultraviolet photodetector (UVPD). The as-synthesized samples were investigated in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and UV visible spectrophotometer. The as-prepared Ag/rGO films show enhanced light absorption attributed to the localized surface plasmon resonance (LSPR). The optimized 1.0 wt.% Ag/rGO incorporated into SnO2-based UVPD exhibits a significant photocurrent response due to the enhanced absorption light and effective suppression of charge recombination. This UVPD demonstrates a high performance, with photocurrent density reaching 0.29 mAcm−2 compared to the SnO2-based device with 0.16 mAcm−2. This device also exhibits a high on:off ratio of 195 and fast response time, which are superior to that of the free-modified one. In addition, the UVPD based on plasmon-modified SnO2 photoanode treated with TiCl4-aqueous solution has attained a higher photocurrent with a maximum value reaching 5.4 mAcm−2, making this device favorable in ultraviolet detection.
Highlights
Owing to the arising demand for precise detection of ultraviolet radiation in civil and military applications, the development of ultraviolet photodetectors with energy efficiency, a sustainable optical energy detection system, and essential and cost-effective wide bandgap material, such asTiO2, SnO2, ZnO, GaN, SiC, graphene, MoS, and quantum dots, have become vital [1,2,3,4,5,6,7,8]
Ammonia solution was mixed with graphene (GO) and and reacted with graphene oxide (GO) functional group to form a negative charge on the surface of GO [52]
We successfully prepared Ag/reduced graphene oxide (Ag/reduced graphene oxide (rGO)) incorporated into SnO2 nanorods by hydrothermal method
Summary
Owing to the arising demand for precise detection of ultraviolet radiation in civil and military applications, the development of ultraviolet photodetectors with energy efficiency, a sustainable optical energy detection system, and essential and cost-effective wide bandgap material, such as. The SnO2 -based UVPDs so far have been reported as demonstrating significantly low photocurrent and poor photoresponse, due to their ~300 mV positive shift in the conductive band edge of SnO2 and lower trapping density with numerous recombination sites, which limit their application in optoelectronics devices [26] Several techniques such as shape and particle size control [27,28,29,30], metal deposition [31,32,33], and hybridized carbon material [34,35] have been employed to prepare SnO2 -based photoanode materials. A silver nanoparticles and reduced graphene oxide (Ag/rGO) composite incorporated into SnO2 NRs were utilized as photoanodes for PEC-type self-powered UVPDs. The Ag/rGO plasmonic hybrid composite was synthesized by solvothermal method and simultaneously reduced without using any hazardous reducing agent. To evaluate the performance of PEC-type self-powered UVPDs, the on:off ratio, response time, and the photocurrent vs. light intensity were measured
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