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Counterintuitive sensing mechanism of ZnO nanoparticle based gas sensors
Han, Ning1,2; Wu, Xiaofeng1; Chai, Linyu1,2; Liu, Haidi1; Chen, Yunfa1; Chen, YF
2010-09-21
Source PublicationSENSORS AND ACTUATORS B-CHEMICAL
ISSN0925-4005
Volume150Issue:1Pages:230-238
AbstractZinc oxide nanoparticles are prepated by calcining zinc hydrocarbonate precursors at 300-700 degrees C (ZnO300-700). and corresponding gas sensing property are tested at 300 degrees C by using formaldehyde as the probe Although the nanoparticle sizes are found to gradually increase with calcination temperature, the sensor measurements reveal the size-independent behavior that ZnO500 and ZnO300 have the highest and lowest responses, respectively Spectroscopic characterization further reveals nonstoichiometric compositions of ZnO nanoparticles ZnO300 has the largest excess oxygen (oxygen interstitial, O(1)). whereas ZnO500 has the largest excess zinc (oxygen vacancy, V(o) and/or zinc interstitial, Zn(1)) Accordingly, a new sensing mechanism is proposed for ZnO nanoparticle sensois Excess zinc favors chemisorption of oxygen onto the nanoparticle surface, leading to reacting with mot e formaldehyde molecules to get a high signal On the contrary, excess oxygen inhibits free oxygen to be chemisorbed onto the nanoparticle surface, and thus decreases the gas response Finally, this new sensing mechanism is verified by testing gas response of ZnO500 nanoparticles annealed at different atmospheres (C) 2010 Elsevier B V All lights reserved
KeywordZinc Oxide Nonstoichiometry Spectroscopy Gas Sensor Crystal Defect
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.snb.2010.07.009
Indexed BySCI
Language英语
WOS KeywordZINC-OXIDE ; VAPOR-DEPOSITION ; THERMAL-ANALYSIS ; THIN-FILMS ; DOPED ZNO ; PHOTOLUMINESCENCE ; NANORODS ; DEFECTS ; PROPERTY ; METHANOL
WOS Research AreaChemistry ; Electrochemistry ; Instruments & Instrumentation
WOS SubjectChemistry, Analytical ; Electrochemistry ; Instruments & Instrumentation
WOS IDWOS:000282726200033
Citation statistics
Cited Times:99[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5708
Collection多相复杂系统国家重点实验室
Corresponding AuthorChen, YF
Affiliation1.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Han, Ning,Wu, Xiaofeng,Chai, Linyu,et al. Counterintuitive sensing mechanism of ZnO nanoparticle based gas sensors[J]. SENSORS AND ACTUATORS B-CHEMICAL,2010,150(1):230-238.
APA Han, Ning,Wu, Xiaofeng,Chai, Linyu,Liu, Haidi,Chen, Yunfa,&Chen, YF.(2010).Counterintuitive sensing mechanism of ZnO nanoparticle based gas sensors.SENSORS AND ACTUATORS B-CHEMICAL,150(1),230-238.
MLA Han, Ning,et al."Counterintuitive sensing mechanism of ZnO nanoparticle based gas sensors".SENSORS AND ACTUATORS B-CHEMICAL 150.1(2010):230-238.
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