TY - GEN
T1 - Micromachined quartz resonator functionalized with single walled carbon nanotubes
AU - Goyal, Abhijat
AU - Joshi, Prasoon
AU - Tadigadapa, Srinivas
AU - Gupta, Awnish
AU - Eklund, Peter
PY - 2005/12/1
Y1 - 2005/12/1
N2 - Single walled carbon nanotubes (SWNTs) are reservoirs of gases as they can adsorb on their walls as well as retain gas molecules in their hollow cylindrical interior. This has important applications for example in fuel cell technology for hydrogen storage, as a gas sensor for realization of artificial nose, etc. Storage of gases by carbon nanotubes have been recently investigated by monitoring changes in their thermoelectric power and electrical resistivity due to their interaction with gas molecules. In this paper we present a gravimetric study of interaction of gas molecules with isolated SWNTs using a micromachined ultrasensitive quartz crystal microbalance (QCM). The adsorption and desorption of gas molecules with different molecular weights from carbon nanotubes revealed that changes in resonance frequency and quality factor of the resonating crystal scale as approximately M0.45, where M is the mass the of the gas molecule as compared to M1/3 dependence observed in case of changes in thermoelectric power and electrical resistance for thin films of the carbon nanotubes. The use of QCM enables room temperature probing of gas interaction with isolated single walled carbon nanotubes. Specific interaction of gases with carbon nanotubes on QCM provides potential application of the device as a gas sensor.
AB - Single walled carbon nanotubes (SWNTs) are reservoirs of gases as they can adsorb on their walls as well as retain gas molecules in their hollow cylindrical interior. This has important applications for example in fuel cell technology for hydrogen storage, as a gas sensor for realization of artificial nose, etc. Storage of gases by carbon nanotubes have been recently investigated by monitoring changes in their thermoelectric power and electrical resistivity due to their interaction with gas molecules. In this paper we present a gravimetric study of interaction of gas molecules with isolated SWNTs using a micromachined ultrasensitive quartz crystal microbalance (QCM). The adsorption and desorption of gas molecules with different molecular weights from carbon nanotubes revealed that changes in resonance frequency and quality factor of the resonating crystal scale as approximately M0.45, where M is the mass the of the gas molecule as compared to M1/3 dependence observed in case of changes in thermoelectric power and electrical resistance for thin films of the carbon nanotubes. The use of QCM enables room temperature probing of gas interaction with isolated single walled carbon nanotubes. Specific interaction of gases with carbon nanotubes on QCM provides potential application of the device as a gas sensor.
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U2 - 10.1109/ICSENS.2005.1597831
DO - 10.1109/ICSENS.2005.1597831
M3 - Conference contribution
AN - SCOPUS:33847262534
SN - 0780390563
SN - 9780780390560
T3 - Proceedings of IEEE Sensors
SP - 841
EP - 844
BT - Proceedings of the Fourth IEEE Conference on Sensors 2005
T2 - Fourth IEEE Conference on Sensors 2005
Y2 - 31 October 2005 through 3 November 2005
ER -