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Hari Krishna Salila Vijayalal Mohan,Jianing An,Kin Liao,Chee How Wong,Lianxi Zheng 한국물리학회 2014 Current Applied Physics Vol.14 No.12
Carbon nanotubes (CNTs) in a chemiresistor setup have been widely explored in bio/chemical sensing. Detection of certain molecules with environmental and health related importance such as 9- anthracenecarboxylic acid, diclofenac sodium, and curcumin using electrochemical methods/unfunctionalized CNTs suffer from lack of response, high limit of detection (LOD) and poor selectivity. The key to overcome these issues is to decorate CNTs with host (receptor) molecules like b-cyclodextrin (b-CD) that interact with guest (target) molecules by hosteguest complex formation. To improve guest recognition, and consequently, the sensor performance, effective immobilization of b-CD on the CNT surface using a non-covalent bridging molecule such as 3, 4, 9, 10-perylene tetracarboxylic acid (PTCA) is required. Furthermore, the selectivity can be assessed using the conductance correlation patterns of different host eguest systems in conjunction with a pattern classification tool. Our results indicate that PTCA linked b- CD-decorated CNT chemiresistors showed a good linear detection range (~100 pMe100 nM), sensitivity (~3 103e9 102 nM1) and LOD (~62 pMe101 nM), compared to devices without PTCA, in the detection of the guest molecules. The distinction in correlation patterns of different hosteguest systems was corroborated by pattern classification yielding a classification accuracy, sensitivity, and specificity of ~91.83%, ~90.13%, and ~85.39%, respectively.
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