Synthesis of VO2 thin films from vanadium powder and determination of room-temperature NH3 sensing properties

Hien, Vu Xuan; Thang, Tran Manh; Dong, Vu Thanh; Nhat, Dang Duc; Nghi, Nguyen Thanh; Phuoc, Luong Huu; Khoa, Cao Tien; Vuong, Dang Duc; Chien, Nguyen Duc

doi:10.1007/s10854-021-05956-w

Cited by 5 publications

(1 citation statement)

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“…The mechanism for detecting benzene can be described using the generally accepted views on reactions that occur between gas and semiconductor surfaces [ 72 , 73 , 74 , 75 ]. In ambient air at elevated temperatures, adsorption of oxygen molecules on the semiconductor surface occurs, which results in changes in material resistance due to electrons from the conduction band reducing O 2 to ionic species (reaction 2).…”

Section: Resultsmentioning

confidence: 99%

Microextrusion Printing of Hierarchically Structured Thick V2O5 Film with Independent from Humidity Sensing Response to Benzene

et al. 2022

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The process of V2O5 oxide by the combination of sol-gel technique and hydrothermal treatment using heteroligand [VO(C5H7O2)2–x(C4H9O)x] precursor was studied. Using thermal analysis, X-ray powder diffraction (XRD) and infra-red spectroscopy (IR), it was found that the resulting product was VO2(B), which after calcining at 300 °C (1 h), oxidized to orthorhombic V2O5. Scanning electron microscopy (SEM) results for V2O5 powder showed that it consisted of nanosheets (~50 nm long and ~10 nm thick) assembled in slightly spherical hierarchic structures (diameter ~200 nm). VO2 powder dispersion was used as functional ink for microextrusion printing of oxide film. After calcining the film at 300 °C (30 min), it was found that it oxidized to V2O5, with SEM and atomic force microscopy (AFM) results showing that the film structure retained the hierarchic structure of the powder. Using Kelvin probe force microscopy (KPFM), the work function value for V2O5 film in ambient conditions was calculated (4.81 eV), indicating a high amount of deficiencies in the sample. V2O5 film exhibited selective response upon sensing benzene, with response value invariable under changing humidity. Studies of the electrical conductivity of the film revealed increased resistance due to high film porosity, with conductivity activation energy being 0.26 eV.

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