Improvement of Ethanol Gas-Sensing Responses of ZnO–WO3 Composite Nanorods through Annealing Induced Local Phase Transformation
Open Access
- 30 April 2019
- journal article
- research article
- Published by MDPI AG in Nanomaterials
- Vol. 9 (5) , 669
Abstract
In this study, ZnO–WO3 composite nanorods were synthesized through a combination of hydrothermal growth and sputtering method. The structural analysis results revealed that the as-synthesized composite nanorods had a homogeneous coverage of WO3 crystallite layer. Moreover, the ZnO–WO3 composite nanorods were in a good crystallinity. Further post-annealed the composite nanorods in a hydrogen-containing atmosphere at 400 °C induced the local phase transformation between the ZnO and WO3. The ZnO–WO3 composite nanorods after annealing engendered the coexistence of ZnWO4 and WO3 phase in the shell layer which increased the potential barrier number at the interfacial contact region with ZnO. This further enhanced the ethanol gas-sensing response of the pristine ZnO–WO3 composite nanorods. The experimental results herein demonstrated a proper thermal annealing procedure of the binary composite nanorods is a promising approach to modulate the gas-sensing behavior the binary oxide composite nanorods.Keywords
Funding Information
- Ministry of Science and Technology, Taiwan (MOST 105-2628-E-019-001-MY3, MOST 107-2813-C-019-020-E)
This publication has 30 references indexed in Scilit:
- Enhanced Methane Sensing Properties of WO3 Nanosheets with Dominant Exposed (200) Facet via Loading of SnO2 NanoparticlesNanomaterials, 2019
- Crystal phase content-dependent functionality of dual phase SnO 2 –WO 3 nanocomposite films via cosputtering crystal growthRSC Advances, 2019
- Preparation of Orthorhombic WO3 Thin Films and Their Crystal Quality-Dependent Dye Photodegradation AbilityCoatings, 2019
- Hydrothermal Synthesis of CeO2-SnO2 Nanoflowers for Improving Triethylamine Gas Sensing PropertyNanomaterials, 2018
- Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO LoadingNanomaterials, 2018
- Growth and properties of ZnO nanorods by RF-sputtering for detection of toxic gasesRSC Advances, 2018
- One-step synthesis of flower-shaped WO3 nanostructures for a high-sensitivity room-temperature NOx gas sensorRSC Advances, 2016
- Crystal growth and shell layer crystal feature-dependent sensing and photoactivity performance of zinc oxide–indium oxide core–shell nanorod heterostructuresCrystEngComm, 2015
- Combinational physical synthesis methodology and crystal features correlated with oxidizing gas detection ability of one-dimensional ZnO–VOxcrystalline hybridsCrystEngComm, 2015
- A facile method for enhancing the sensing performance of zinc oxide nanofibers gas sensorsRSC Advances, 2013