Label-free molecular detection with capped carbon nanotubes

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Journal titleApplied Physics Letters
Article number83103
SubjectElectrostatic trapping; Gap distances; Gas molecules; Label-free molecular detection; Polarizabilities; Proof of principles; Selective detection; Sensing region; Binary mixtures; Molecules; Carbon nanotubes
AbstractWe present a theoretical proof-of-principle analysis of a device composed of mutually faced capped carbon nanotubes for the selective detection of hardly distinguishable gas molecules in binary mixtures (methanol/formaldehyde and H2O/H2S). Selectivity arises, on one side, from I-V responses of the sensor in the presence of different gases trapped between the nanotube caps. On the other side, the different dipole moments and polarizabilities of the molecules lead to different population probabilities in the sensing region, acting as a highly selective electrostatic trapping device. The selectivity can be tuned by the bias voltage and by the gap distance between the nanotubes. © 2013 American Institute of Physics.
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NPARC number21270528
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Record identifier0bf84bec-7a19-4b09-a721-eb286e908f51
Record created2014-02-17
Record modified2016-05-09
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