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Facet-dependent gas sensing properties of Cu2O crystals
Xie, Zheng1,2; Han, Ning2,3; Li, Wenhui2; Deng, Yuzhou2; Gong, Shuyan2; Wang, Ying2; Wu, Xiaofeng2; Li, Yingxia1,2; Chen, Yunfa2,3

Well-defined polyhedral Cu2O exposing different crystal facets are synthesized via a facile solution-phase method, and the facet-dependent gas sensing properties are investigated. The results show that cubic Cu2O exposing (100) facets has higher sensitivity to NO2, acetone and benzene than octahedral Cu2O with (111) facets. More importantly, the cubic Cu2O has high selectivity to NO2 and acetone at varied working temperatures by different sensing mechanisms of adsorption, chemical reaction, and intrinsic carrier excitation, as verified by the catalytic and electric property measurements. The higher sensitivity and selectivity of cubic Cu2O is explained by the relatively lower work function of (100) surfaces than that of (111), which induces a thicker surface hole accumulation layer and thus, a higher bulk hole activation energy (0.55eV and 0.36eV respectively). The synergistic effect of catalytic and electric properties gives rise to gas sensitivity decrease with the reduced percentage of (111) facets, which is beneficial to the gas sensing material design and also, is promising for the future highly sensitive and selective gas sensor fabrication.

KeywordCatalysis Crystal Facets Cu_2o Gas Sensing Surfaces Work Function
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
Indexed BySCI
WOS KeywordElectrical-conductivity Properties ; Catalytic-activities ; Room-temperature ; Shape Evolution ; Nanocrystals ; Sensitization ; Formaldehyde ; Performance ; Reduction ; Nanowires
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
Funding OrganizationNational Key Research and Development Program(2016YFC0207101) ; National Natural Science Foundation of China(51272253) ; State Key Laboratory of Multiphase Complex Systems(MPCS-2014-C-01)
WOS IDWOS:000403339900014
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, North Third Ring Rd 15, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, North Second St 1, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Jimei Ave 1799, Xiamen 361021, Peoples R China
Recommended Citation
GB/T 7714
Xie, Zheng,Han, Ning,Li, Wenhui,et al. Facet-dependent gas sensing properties of Cu2O crystals[J]. PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE,2017,214(6).
APA Xie, Zheng.,Han, Ning.,Li, Wenhui.,Deng, Yuzhou.,Gong, Shuyan.,...&Chen, Yunfa.(2017).Facet-dependent gas sensing properties of Cu2O crystals.PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE,214(6).
MLA Xie, Zheng,et al."Facet-dependent gas sensing properties of Cu2O crystals".PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE 214.6(2017).
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