title: Construction of 1D SnO2-coated ZnO nanowire heterojunction for their improved n-butylamine sensing performances.
abstract: One-dimensional (1D) SnO2-coated ZnO nanowire (SnO2/ZnO NW) N-N heterojunctions were successfully constructed by an effective solvothermal treatment followed with calcination at 400 °C. The obtained samples were characterized by means of XRD, SEM, TEM, Scanning TEM coupled with EDS and XPS analysis, which confirmed that the outer layers of N-type SnO2nanoparticles (avg. 4 nm) were uniformly distributed onto our pre-synthesized n-type ZnO nanowire supports (diameter 80~100 nm, length 12~16 μm). Comparisons of the gas sensing performances among pure SnO2, pure ZnO NW and the as-fabricated SnO2/ZnO NW heterojunctions revealed that after modification, SnO2/ZnO NW based sensor exhibited remarkably improved response, fast response and recovery speeds, good selectivity and excellent reproducibility to n-butylamine gas, indicating it can be used as promising candidates for high-performance organic amine sensors. The enhanced gas-sensing behavior should be attributed to the unique 1D wire-like morphology of ZnO support, the small size effect of SnO2nanoparticles, and the semiconductor depletion layer model induced by the strong interfacial interaction between SnO2and ZnO of the heterojunctions. The as-prepared SnO2/ZnO NW heterojunctions may also supply other novel applications in the fields like photocatalysis, lithium-ion batteries, waste water purification, and so on.
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China.
authors.forename: Liwei
authors.initials: L
authors.lastname: Wang
authors.affiliation: Experimental Practising &Teaching center, Hebei GEO University, Shijiazhuang, 050031, China.
authors.forename: Jintao
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China.
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China.
authors.forename: Kefu
authors.initials: K
authors.lastname: Yu
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China.
authors.forename: Xingying
authors.initials: X
authors.lastname: Tang
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China.
authors.forename: Shaopeng
authors.initials: S
authors.lastname: Wang
authors.affiliation: School of Marine Sciences, Guangxi University, Nanning, 530004, China.|Coral Reef Research Center of China, Guangxi University, Nanning, 530004, China.
authors.forename: Chaoshuai
authors.initials: C
authors.lastname: Wei