A T Charlie Johnson et al 2006 Semicond. Sci. Technol. 21 S17 doi:10.1088/0268-1242/21/11/S03
A T Charlie Johnson1, Cristian Staii1,5, Michelle Chen2, Sam Khamis1, Robert Johnson1, M L Klein3 and A Gelperin4
Show affiliationsWe demonstrate a versatile class of nanoscale chemical sensors based on single-stranded DNA (ssDNA) for chemical recognition and single-walled carbon nanotube field effect transistors (SWNT FETs) for electronic read-out. SWNT FETs with a nanoscale coating of ssDNA respond to vapours that cause no detectable conductivity change in bare devices. The gases tested are methanol, trimethylamine, propionic acid, dimethylmethylphosphonate and dinitrotoluene. Sensor responses differ in sign and magnitude for different gases and can be tuned by choice of the ssDNA base sequence. Sensors respond and recover rapidly (seconds), and the sensor surface is self-regenerating. Preliminary results of all-atom molecular dynamics simulations are consistent with experiment.
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
87.80.-y Biophysical techniques (research methods)
87.15.Cc Folding: thermodynamics, statistical mechanics, models, and pathways
Issue 11 (November 2006)
Received 10 July 2006, in final form 15 September 2006
Published 18 October 2006
A T Charlie Johnson et al 2006 Semicond. Sci. Technol. 21 S17
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