GEOMETRIC STRUCTURE ENHANCED NITROGEN GAS SENSING ABILITY FROM CARBON NANOTUBES

Yung-Huang Chang ； Yuan-Tsung Chen ； Chien-Sheng Huang

《Journal of Innovative Technology》 1卷2期 (2019/09) Pp. 41-46

https://doi.org/10.29424/JIT.201909_1(2).0007

摘要

For decades, the nanostructure of carbon nanotubes (CNTs) have attracted ample attention in the application of gas sensors. However, those CNT-based gas sensors are mostly manufactured in the single or film structures. Until now, the CNT bundle structure in gas sensors has not yet been investigated by researchers. In this study, the effects of the film and the bundle structure in CNTs are explored. The abundant interstitial and groove sites, beneficial for N_2 gas absorption and charge transfer, were provided through the CNT bundle with particular geometric structures. In terms of detecting nitrogen gas, the CNT bundle is found to have significantly superior sensitivity, faster response and recover time, comparing to the CNT film. Therefore, the geometric structure of CNTs is approved to be one of the features the designers of the gas sensor should take into consideration in the future.

關鍵字

Gas sensor ； CNT film ； CNT bundle ； thermal CVD

參考文獻

Cantalini, C., Valentini, L., Lozzi, L., Armentano, I., Kenny, J.M., and Santucci, S. (2003). “NO2 gas sensitivity of carbon nanotubes obtained by plasma enhanced chemical vapor deposition.” Sensors and Actuators. B, Chemical, 93, 333-337.

Chang, Y.-H., Lin, H.-W., and Chen, C. (2012). “Growth mechanism of self-assembled TiO2 nanorod arrays on Si substrates fabricated by Ti anodization.” Journal of The Electrochemical Society, 159, D512-D517.

Chang, Y.-H., Lin, C.-T., Chen, T.-Y., Hsu, C.-L., Wei, K.-H., and Li, L.-J. (2013). “Highly Efficient Electrocatalytic Hydrogen Production by MoSx Grown on Graphene-Protected 3-Dimensional Ni Foam.” Advanced Materials, 25, 756-760.

Chang, Y.-H., Nikam, R.D, Lin, C.-T., Huang, J.-K., Tseng, C.-C., Hsu, C.-L., Cheng, C.-C., Su, C.-Y., Li, L.-J., and Chua, D. H.C. (2014). “Enhanced Electrocatalytic Activity of MoSx on TCNQtreated Electrode for Hydrogen Evolution Reaction.” ACS Applied Materials & Interfaces, 6, 17679-17685.

Chang, Y.-H., Zhang, W., Zhu, Y., Han, Y., Pu, J., Chang, J.-K., Hsu, W.-T., Huang, J.-K., Hsu, C.-L., Chiu, M.-H., Takenobu, T., Li, H., Wu, C.-I, Chang, W.-H., Wee, A.T.S., and Li, L.-J. (2014). “Monolayer MoSe2 Grown by Chemical Vapor deposition for Fast Photodetection.” ACS Nano, 8, 8582-8590.