标题：Synthesis and gas sensing performance of NiO decorated SnO2 vertical-standing nanotubes composite thin films
作者：Zhang, Lei ;He, Jing ;Jiao, Wanli
作者机构：[Zhang, Lei ;He, Jing ;Jiao, Wanli ] School of Material Science and Engineering, Shandong University of Technology, Zibo; 255049, China
来源：Sensors and Actuators, B: Chemical
摘要：In this work, a new type NiO decorated SnO2 vertical-standing nanotubes composite thin film was synthesized successfully via a facile hydrothermal method. The microstructure, physico-chemical surface state and morphology of the composite thin film were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), respectively. The results showed that the NiO decorated SnO2 vertical-standing nanotubes composite thin film with a coral-like microstructure was built of numerous 1D SnO2 nanotubes with the size of 200–300 nm in diameter and 1.5 μm in length; while NiO nanoplates with the size of 20 nm in diameter decorated on the surface of SnO2 nanotubes. Due to the enhanced adsorption of oxygen molecules, formation of p-NiO/n-SnO2 heterojunction and porous structure, the NiO/SnO2 thin film gas sensor with an Ni2+/Sn4+ molar ratio of 5% exhibited high response value, good selectivity and quick response characteristics to ethanol at the optimum working temperature of 250 ℃.
© 2018 Elsevier B.V.