Pd 나노입자가 코팅된 β-Bi2O3 나노와이어의 NO2 검출 특성
NO2 Sensing Properties of β-Bi2O3 Nanowires Sensor Coated with Pd Nanoparticles
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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.
Abstract
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.
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