한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제48권6호
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  • Pages.303-308
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  • 2015
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지
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Pd 나노입자가 코팅된 β-Bi2O3 나노와이어의 NO2 검출 특성

NO2 Sensing Properties of β-Bi2O3 Nanowires Sensor Coated with Pd Nanoparticles

  • 박성훈 (인하대학교 신소재공학과) ;
  • 강우승 (인하공업전문대학 금속재료과)
  • Park, Sunghoon (Department of Materials Science & Engineering, Inha University) ;
  • Kang, Wooseung (Department of Metallurgical & Materials Engineering, Inha Technical College)
  • 투고 : 2015.12.08
  • 심사 : 2015.12.18
  • 발행 : 2015.12.31
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초록

Pd-functionalized ${\beta}-Bi_2O_3$ 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 ${\beta}-Bi_2O_3$ 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 ${\beta}-Bi_2O_3$ crystals and Pd nanoparticles. Pd-functionalized ${\beta}-Bi_2O_3$ nanowires sensor showed an enhanced sensing performance to $NO_2$ gas compared to as-synthesized ${\beta}-Bi_2O_3$ nanowires sensor. As synthesized and Pd-functionalized ${\beta}-Bi_2O_3$ 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 ${\beta}-Bi_2O_3$ nanowires by Pd-functionalization is discussed.

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