Enhanced surface-related ultraviolet–visible photoresponse in carbothermal ZnO nanowires by intertwined single-walled carbon nanotubes
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.
This work was supported by the National Natural Science Foundation of China (Grant Nos. 61574117 and 61274120). Science and Technology Plans of Fujian Province of China (Grant 2017H0039).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 12.Chang J, Khalid Najeeb C, Lee JH, Lee M, Kim JH (2011) High-performance photoresponse from single-walled carbon nanotube-zinc oxide heterojunctions. J Phys D Appl Phys 44:885–896Google Scholar