Construction of Co3O4/CoWO4 core-shell urchin-like microspheres through ion-exchange method for high-performance acetone gas sensing performance

被引：47
作者：
Qu, Fengdong [1 ,3 ]
Zhang, Nan [1 ]
Zhang, Shendan [3 ,4 ]
Zhao, Ruiyang [2 ]
Yao, Dong [1 ]
Ruan, Shengping [1 ]
Yang, Minghui [3 ,4 ]
机构：
[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China
[2] Qingdao Univ Sci & Technol, Coll Chem Engn, State Key Lab Base Ecochem Engn, Qingdao 266042, Peoples R China
[3] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China
[4] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2020年 / 309卷
基金：
中国国家自然科学基金;
关键词：
Co3O4/CoWO4; Gas sensor; Core-shell; Heterostructure; Acetone; SELECTIVE DETECTION; HOLLOW SPHERES; CO3O4; HETEROJUNCTIONS; NANOSTRUCTURES; NANOPARTICLES; HETEROSTRUCTURES; NANOCOMPOSITES; SENSITIVITY; NANOCAGES;
D O I：
10.1016/j.snb.2020.127711
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Hierarchical urchin-like Co3O4/CoWO4 core/shell microspheres are fabricated using a hydrothermal ion exchange approach. Co3O4/CoWO4 microspheres are made using Co3O4 nanowires, which are then covered using thin CoWO4 nanosheets. Capture of cobalt ions from Co3O4 nanowires by the tungsten acid radical is responsible for the CoWO4 nanosheet covering. The gas sensing characteristics show that urchin-like Co3O4/CoWO4 core/shell microspheres-based sensors shows high response towards acetone vapor, which is larger than that of either Co3O4 or CoWO4. A possible gas sensing mechanism for the improved performance of Co3O4/CoWO4 core/shell microspheres-sensor is the formation of heterostructure, which modulates the hole accumulation layer of Co3O4.
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页数：7
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