TY - JOUR
T1 - Application of dielectrophoresis to fabrication of carbon nanohorn gas sensor
AU - Suehiro, Junya
AU - Sano, Noriaki
AU - Zhou, Guangbin
AU - Imakiire, Hiroshi
AU - Imasaka, Kiminobu
AU - Hara, Masanori
N1 - Funding Information:
This work was partly supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (No. 16360207 for J.S. and No. 14750618 for N.S.). J.S. acknowledges the financial support provided by the Iketani Science and Technology Foundation of Tokyo, Japan. N.S. gratefully acknowledges the support from the Hyogo Science and Technology Association.
PY - 2006/6
Y1 - 2006/6
N2 - This paper describes an electrokinetic fabrication method for a gas sensor composed of single-wall carbon nanohorns (SWCNHs) using dielectrophoresis (DEP). The authors have previously demonstrated that DEP manipulation of carbon nanotubes (CNTs) can be applied to the fabrication of a CNT gas sensor. In the present study, we further explored the possibility of electrokinetic manipulation of SWCNHs. The latter have different structures and properties compared to CNTs. The SWCNHs were synthesized using the 'arc in water with gas injection' method. The SWCNH aggregates were dispersed in ethanol and trapped in an interdigitated microelectrode gap under the action of positive DEP. After the DEP process, the ethanol was evaporated and the microelectrode retaining the SWCNHs was exposed to nitrogen dioxide (NO2) or ammonia (NH3) gas while the electrode impedance was monitored. It was found that conductance of the DEP-fabricated SWCNH sensor increased or decreased upon exposure to ppm-levels of NO2 or NH3, respectively. These results were similar to those previously obtained for CNT gas sensors and suggest that the SWCNH aggregate behaves as a p-type semiconductor. The comparison reveals that intrinsic NO2 sensitivity of the SWCNHs is lower than that of single-wall CNTs (SWCNTs) but comparable with the intrinsic sensitivity of multiple-wall CNTs (MWCNTs).
AB - This paper describes an electrokinetic fabrication method for a gas sensor composed of single-wall carbon nanohorns (SWCNHs) using dielectrophoresis (DEP). The authors have previously demonstrated that DEP manipulation of carbon nanotubes (CNTs) can be applied to the fabrication of a CNT gas sensor. In the present study, we further explored the possibility of electrokinetic manipulation of SWCNHs. The latter have different structures and properties compared to CNTs. The SWCNHs were synthesized using the 'arc in water with gas injection' method. The SWCNH aggregates were dispersed in ethanol and trapped in an interdigitated microelectrode gap under the action of positive DEP. After the DEP process, the ethanol was evaporated and the microelectrode retaining the SWCNHs was exposed to nitrogen dioxide (NO2) or ammonia (NH3) gas while the electrode impedance was monitored. It was found that conductance of the DEP-fabricated SWCNH sensor increased or decreased upon exposure to ppm-levels of NO2 or NH3, respectively. These results were similar to those previously obtained for CNT gas sensors and suggest that the SWCNH aggregate behaves as a p-type semiconductor. The comparison reveals that intrinsic NO2 sensitivity of the SWCNHs is lower than that of single-wall CNTs (SWCNTs) but comparable with the intrinsic sensitivity of multiple-wall CNTs (MWCNTs).
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U2 - 10.1016/j.elstat.2005.11.001
DO - 10.1016/j.elstat.2005.11.001
M3 - Article
AN - SCOPUS:33645998085
SN - 0304-3886
VL - 64
SP - 408
EP - 415
JO - Journal of Electrostatics
JF - Journal of Electrostatics
IS - 6
ER -