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Abnormal n-p-n type conductivity transition of hollow ZnO/ZnFe2O4 nanostructures during gas sensing process: The role of ZnO-ZnFe2O4 hetero-interface
Li, Wenhui1,2; Wu, Xiaofeng1; Chen, Jiayuan1,2; Gong, Yan1,2; Han, Ning1; Chen, Yunfa1
2017-12-01
Source PublicationSENSORS AND ACTUATORS B-CHEMICAL
ISSN0925-4005
Volume253Issue:DECPages:144-155
Abstract

The hollow ZnO/ZnFe2O4 microspheres with heterogeneous structure are synthesized by direct pyrolysis of metal-organic frameworks. The as-prepared ZnO/ZnFe2O4 microspheres have well-defined spherical morphology with 1.5 pin in diameter and multiple porous shells constructed by interpenetrated ZnO and ZnFe2O4 heterogeneous nanoparticles. Interestingly, the hollow ZnO/ZnFe2O4 microspheres based gas sensors show interestingly temperature-dependent n-p-n type conductivity transition in detecting low-concentration VOC gases including ethanol, acetone, toluene and benzene. This interestingly n-p-n transition phenomenon is mainly ascribed to the trade-off of highly separated electron-hole pairs originated from the staggered type-II band alignment of in-shell ZnO-ZnFe2O4 hetero-interfaces, which is modulated by thermally-dependent ionization reaction of surface-absorbed oxygen molecules and extra electron injection due to surface reaction of reductive VOCs during gas-sensing process. This work presents a facile route to construct hollow nanostructures with heterogeneous feature and provides a new insight into sensing mechanism, exhibiting the potential application of ZnO/ZnFe2O4 microspheres in developing highly sensitive and selective gas-sensing materials in detecting low-concentration VOCs. (C) 2017 Elsevier B.V. All rights reserved.

KeywordZno/znfe2o4 Hollow Microspheres Gas Sensor P-n Conducting Transition
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.snb.2017.06.131
Indexed BySCI
Language英语
WOS KeywordLITHIUM-ION BATTERY ; FERRITE NANOPARTICLES ; FACILE SYNTHESIS ; ACETONE SENSOR ; THIN-FILMS ; PERFORMANCE ; ZNFE2O4 ; MICROSPHERES ; ALPHA-FE2O3 ; SURFACE
WOS Research AreaChemistry ; Electrochemistry ; Instruments & Instrumentation
WOS SubjectChemistry, Analytical ; Electrochemistry ; Instruments & Instrumentation
Funding OrganizationNational Natural Science Foundation of China(51272253 ; 863 Hi-tech Research and Development Program of China(2013AA031801) ; Strategic Project of Science and Technology of Chinese Academy of Sciences(XDB05050000) ; 51672273)
WOS IDWOS:000411124800018
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23287
Collection多相复杂系统国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li, Wenhui,Wu, Xiaofeng,Chen, Jiayuan,et al. Abnormal n-p-n type conductivity transition of hollow ZnO/ZnFe2O4 nanostructures during gas sensing process: The role of ZnO-ZnFe2O4 hetero-interface[J]. SENSORS AND ACTUATORS B-CHEMICAL,2017,253(DEC):144-155.
APA Li, Wenhui,Wu, Xiaofeng,Chen, Jiayuan,Gong, Yan,Han, Ning,&Chen, Yunfa.(2017).Abnormal n-p-n type conductivity transition of hollow ZnO/ZnFe2O4 nanostructures during gas sensing process: The role of ZnO-ZnFe2O4 hetero-interface.SENSORS AND ACTUATORS B-CHEMICAL,253(DEC),144-155.
MLA Li, Wenhui,et al."Abnormal n-p-n type conductivity transition of hollow ZnO/ZnFe2O4 nanostructures during gas sensing process: The role of ZnO-ZnFe2O4 hetero-interface".SENSORS AND ACTUATORS B-CHEMICAL 253.DEC(2017):144-155.
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