Hydrogen Sensing Properties of Multiwall Carbon Nanotubes Decorated with TiO2 Nanoparticles at Room Temperature
TiO2 나노입자가 코팅된 다중 벽 탄소 나노튜브의 상온에서의 수소 가스 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.2015.48.6.309
Multiwall carbon nanotubes are synthesized by using VLS mechanism for the application to $H_2$ gas sensor. MWCNT is not suitable for hydrogen gas sensor due to its low response to the gas. To enhance the gas sensing performance, multiwall carbon nanotubes are coated with $TiO_2$ nanoparticles. Scanning electron microscopy and Transmission electron microscopy showed that the synthesized MWCNT were well dispersed with the diameter and wall thickness of approximately 10-30nm and 5nm, respectively. The MWCNT sensor showed the sensitivities of 1.33-9.5% for the $H_2$ concentration of 100-5000ppm at room temperature. These sensitivities are significantly improved to 6.64-46.65% by coating $TiO_2$ nanoparticles to the MWCNT sensor. The mechanisms of $H_2$ gas sensing improvement of the MWCNT sensor coated with $TiO_2$ nanoparticles are discussed.
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