| 학회 |
한국재료학회 |
| 학술대회 |
2005년 봄 (05/26 ~ 05/27, 무주리조트) |
| 권호 |
11권 1호 |
| 발표분야 |
나노 및 생체재료 |
| 제목 |
Pd 담지된 CNT 소자을 이용한 수소센서 제작과 센서 감지원리에 대한 연구 |
| 초록 |
Recently, it has been demonstrated that carbon nanotubes represent a new type of chemical sensor material which is capable of detecting tiny concentrations of molecules with high sensitivity under ambient conditions. But carbon nanotubes are not sensitive to many types of molecules including hydrogen, indicating an apparent lack of specific interactions between nanotubes and these molecules. We believe that nanotube sensors with molecular specificity can be obtained through rational chemical and/or physical modification of nanotubes. Here, we show that excellent molecular hydrogen sensors can be enabled by decorating single-walled carbon nanotubes (SWNT) with palladium (Pd) nanoparticles either by simple evaporation, or chemical treatment. We investigate gas sensing mechanism of the carbon nanotube field effect transistors decorated with Pd nanoparticles. Upon decorating Pd nanoparicles on the carbon nanotube transistor, transfer characters of the device become almost unaffected by the gate voltage changes. Nevertheless, the magnitude of the current through the device shows sensitivity toward the exposures of NO2, NH3 and H2 gas. We suggest that the decorated Pd nanoparticles on carbon nanotube devices not only emasculate the gate field but also induce hole carriers in the carbon nanotube. Such hole carrier density seems to be diluted or enhanced upon the adsorption of NH3 or NO2 molecules, respectively. We attribute the successful sensing mechanism of H2 gas to the work function decrease of the surface of Pd particles. |
| 저자 |
김병계1, 이정오2, 소혜미2, 나필선3, 박동원4, 공기정2, 장현주2, 최영민2, 류병환2, 김주진1
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| 소속 |
1전북대, 2한국화학(연), 3충남대, 4충북대 |
| 키워드 |
CNT; hydorgen sensor
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| E-Mail |
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