P2NG.1 - UV Enhanced NO2 Sensor at Room Temperature Based on ZnO Nanosphere and Urchin-like array
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- P-2 - Nanomaterials for Gas Sensing
- Author(s)
- H. Tai, Y. Jiang, Z. Yuan, G. Xie, X. Du - School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China , Chengdu (China), J. Li - Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen (China)
- Pages
- 846 - 847
- DOI
- 10.5162/IMCS2018/P2NG.1
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
As a widely employed semiconductor, zinc oxide (ZnO) was regarded as a promising candidate material for NO2 detection. Furthermore, ultraviolet (UV) irradiation was found to be an efficient method to enhance sensing-properties of ZnOfor its intrinsic wide band gap. In this work, novel ZnO thin films withhollow nanosphere (HNS)and urchin-like (UL)array were designed and utilized for NO2 sensing at room temperature.The morphological and spectroscopy properties of films were analyzed via scanning electronic microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible spectroscopy (UV-vis).And NO2-sensing properties of as-fabricated sensors were investigated with and without UV irradiation.After exposing to UV light, both HNS and UL film ZnO sensor achieved a tremendous enhancement in sensing performances. Moreover, ZnO sensor with ULarray showed superior performance with higher response and shorter response time compared with HNS ZnO. In addition, low detection limit (26 ppb) and good repeatability were also obtainedforUL film ZnO sensor. At last, the enhancement mechanism of different structuredZnO sensor was discussed.