Pd 나노입자가 코팅된 β-Bi₂O₃ 나노와이어의 NO₂ 검출 특성

• Published in: Biuletyn Uniejowski Vol. 48; no. 6; pp. 303 - 308
• Main Authors: 박성훈(Sunghoon Park), 강우승(Wooseung Kang)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 01.12.2015
• Subjects: 기계공학; gas sensor; NO; β-Bi₂O; Pd; nanowires
• ISSN: 1225-8024; 2299-8403; 2288-8403
• DOI: 10.5695/JKISE.2015.48.6.303

Pd-functionalized β-Bi2O3 nanowires are synthesized by thermal evaporation of Bi powder using VLS mechanism followed by Pd coating and annealing. In this study, sensing properties of Pd-functionalized β-Bi2O3 nanowires sensor to selected concentrations of NO2 gas were examined. Scanning electron microscopy showed that the nanowires with diameters in a range of 100 - 200 nm and lengths of up to a few tens of micrometers. Transmission electron microscopy and X-ray diffraction confirmed that the products corresponded to the nanowires of β-Bi2O3 crystals and Pd nanoparticles. Pd-functionalized β-Bi2O3 nanowires sensor showed an enhanced sensing performance to NO2 gas compared to as-synthesized β-Bi2O3 nanowires sensor. As synthesized and Pd-functionalized β-Bi2O3 nanowire sensors showed responses of 178% - 338% and 196% - 535% at 300oC, respectively, to 0.05 - 2 ppm NO2. In addition, the underlying mechanism of the enhancement of the sensing properties of β-Bi2O3 nanowires by Pd-functionalization is discussed. KCI Citation Count: 0