NO2 Sensing Properties of β-Bi2O3 Nanowires Sensor Coated with Pd Nanoparticles
Pd 나노입자가 코팅된 β-Bi2O3 나노와이어의 NO2 검출 특성
박성훈;강우승;
Park, Sunghoon;Kang, Wooseung;
인하대학교 신소재공학과;인하공업전문대학 금속재료과;
Department of Materials Science & Engineering, Inha University;Department of Metallurgical & Materials Engineering, Inha Technical College;
DOI : 10.5695/JKISE.2015.48.6.303
Pd-functionalized ${eta}-Bi_2O_3$ 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 ${eta}-Bi_2O_3$ nanowires sensor to selected concentrations of $NO_2$ 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 ${eta}-Bi_2O_3$ crystals and Pd nanoparticles. Pd-functionalized ${eta}-Bi_2O_3$ nanowires sensor showed an enhanced sensing performance to $NO_2$ gas compared to as-synthesized ${eta}-Bi_2O_3$ nanowires sensor. As synthesized and Pd-functionalized ${eta}-Bi_2O_3$ nanowire sensors showed responses of 178% - 338% and 196% - 535% at $300^{circ}C$, respectively, to 0.05 - 2 ppm $NO_2$. In addition, the underlying mechanism of the enhancement of the sensing properties of ${eta}-Bi_2O_3$ nanowires by Pd-functionalization is discussed.
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