Enhanced Acetone-Sensing Performance of a Bilayer Structure Gas Sensor Composed of a ZnO Nanorod Top Layer and a ZnFe<sub>2</sub>O<sub>4</sub> Nanoparticle Decorated ZnO Nanorod Bottom Layer
Hao Wu,
Huichao Zhu,
Jianwei Zhang,
Jun Yu,
Zhenan Tang,
Guanyu Yao,
Wenqing Zhao,
Guohui Wu,
Xia Jin
Affiliations
Hao Wu
School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
Huichao Zhu
School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
Jianwei Zhang
School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
Jun Yu
Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
Zhenan Tang
Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
Guanyu Yao
Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
Wenqing Zhao
Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
Guohui Wu
Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
Xia Jin
Department of Biomedical Engineering, School of Intelligent Medicine, China Medical University, Shenyang 110122, China
In this study, we report a high-performance acetone gas sensor utilizing a bilayer structure composed of a ZnO nanorod top layer and a ZnFe2O4 nanoparticle-decorated ZnO nanorod bottom layer. ZnO nanorods were synthesized via a water-bath method, after which the ZnFe2O4 nanoparticle-decorated ZnO nanorods were prepared using a simple immersion and calcination method. SEM and TEM revealed the porous morphology of the samples and the formation of ZnO-ZnFe2O4 heterojunctions. XPS analysis demonstrated an increase in oxygen vacancy content with the introduction of ZnFe2O4 nanoparticles. Compared to pure ZnO nanorods, ZnFe2O4-decorated ZnO nanorods showed a 3.9-fold increase in response to 50 ppm acetone. Covering this layer with ZnO nanorods further increased the response by an additional 1.6 times, and simultaneously enhanced the selectivity to acetone. The top layer improves gas sensing performance by introducing heterojunctions with the bottom layer, partially blocking acetone gas at the bottom layer to facilitate a more complete reaction, and filtering ethanol interference.
