Abstract
Recognition and management of illegal drugs is of considerable interest because of the dramatic results of their abuse. Amphetamine (AN) is a popular drug of abuse and its recognition in the biological samples is of great importance for drug communities and the police. Here, we considered the AN drug adsorption on the (12,0) zigzag intrinsic and Pt-decorated SiC nanotubes ([email protected]), in order to inspect their potential application as drug sensing material, by TPSS density functional. We found that the intrinsic SiCNT weakly interacted with the AN drug and cannot recognize it. In order to solve this problem, we decorated the SiCNT surface by Pt atoms. The Pt preferentially attaches to a carbon atom, releasing the energy of 3.02 eV. The AN drug adsorbed via its phenyl ring on the Pt atom forming an η6-Pt half-sandwich structure with binding energy (BE) of −1.49 eV. The sensing response of SiCNT obviously elevated from 4.8 to 190.1 by the Pt decoration. A short recovery time of 1.03 s was also obtained for the AN drug desorption. Water solvent increased the BE or sensing response to −1.63 eV or 240.4. Our results propose the [email protected] as a favorable sensing device for AN detection.
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