Novel Carbon Nanotube-Based Nanostructures for High-Temperature Gas Sensing

[摘要] The primary objective of this research is to examine the feasibility of using vertically aligned multi-wall carbon nanotubes (MWCNTs) as a high temperature sensor material for fossil energy systems where reducing atmospheres are present. In the initial period of research, we fabricated capacitive sensors for hydrogen sensing using vertically aligned MWCNTs. We found that CNT itself is not sensitive to hydrogen. Moreover, with the help of Pd electrodes, hydrogen sensors based on CNTs are very sensitive and fast responsive. However, the Pd-based sensors can not withstand high temperature (T<200 C). In the last year, we successfully fabricated a hydrogen sensor based on an ultra-thin nanoporous titanium oxide (TiO{sub 2}) film supported by an AAO substrate, which can operate at 500 C with hydrogen concentrations in a range from 50 to 500 ppm.

[发布日期] 2008-08-31

[学科分类] 再生能源与代替技术

[关键词] CARBON;ELECTRODES;ENERGY SYSTEMS;HYDROGEN;NANOSTRUCTURES;NANOTUBES;TITANIUM OXIDES