TiO₂ 나노입자가 코팅된 다중 벽 탄소 나노튜브의 상온에서의 수소 가스 검출 특성

• Published in: Biuletyn Uniejowski Vol. 48; no. 6; pp. 309 - 314
• Main Authors: 박성훈(Sunghoon Park), 강우승(Wooseung Kang)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 01.12.2015
• Subjects: 기계공학; H; Carbon Nano Tube; Gas sensor; TiO
• DOI: 10.5695/JKISE.2015.48.6.309
• ISSN: 1225-8024

Multiwall carbon nanotubes are synthesized by using VLS mechanism for the application to H2 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 TiO2 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 H2 concentration of 100–5000ppm at room temperature. These sensitivities are significantly improved to 6.64–46.65% by coating TiO2 nanoparticles to the MWCNT sensor. The mechanisms of H2 gas sensing improvement of the MWCNT sensor coated with TiO2 nanoparticles are discussed. KCI Citation Count: 0