1. Enhanced surface-related ultraviolet-visible photoresponse in carbothermal ZnO nanowires by intertwined single-walled carbon nanotubes.
- Author
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Chen, Changsong, Ma, Yang, Chen, Jiang, and San, Haisheng
- Subjects
SINGLE walled carbon nanotubes ,SYNTHESIS of nanowires ,ELECTRODES ,COMPOSITE materials ,IRRADIATION ,SUBSTRATES (Materials science) - Abstract
An intertwined single-walled carbon nanotubes (SWCNTs)/carbothermal ZnO nanowires (ZNWs) composite is synthesized using a facile ultrasonic stirring technology, which is deposited on Au-interdigitated electrodes for ultraviolet-visible (UV-Vis) photoresponse enhancement. It is found that the SWCNT attached on ZNW surface optimizes the surface-related chemical processes and provides effective carrier transport strategies, responsible for the improvement in photo-responsivity and photo-sensing speed. The UV-Vis absorption of ZNWs has been improved after compositing with the high-conductive SWCNTs, contributing to the significantly improved photo-conductance. The photodetector based on SWCNT/ZNW composites (CZWs) with an optimal SWCNT content of 0.1 wt% shows a 300% improvement in photocurrent density, a 200% improvement in responsivity, and a 400% improvement in on/off current ratio over the pure ZNWs-based device under a UV irradiation of 3.26 mW cm
−2 and a bias voltage of 1.0 V. This synthetic method could be scaled up for large-scale fabrication of CZWs on substrate at low cost for practical photodetecting applications. [ABSTRACT FROM AUTHOR]- Published
- 2018
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