In the present work the composites of the amide- and glycyl-functional porphyrin monomers and single wall carbon nanotubes (SWCNTs) were formulated and then applied as novel sensing materials in a quartz crystal microbalance (QMB) sensory array with an integrated preconcentration unit. Two strategies have been adopted for CNT-prophyrin composites design. In the first approach the electropolymerisation of pyrrole-substituted porphyrin monomers occurred via formation of conjugated positively charged polypyrrole backbone, while negatively charged CNT functionalized with carboxylic groups acted as a polymer dopants. In the second case the CNT-porphyrin composites were chemically synthesized via the amide bond formation between carboxylic groups of functionalized CNTs and amino-substituent of prophyrin or via interaction between glycyl-substituted porphyrin monomers and non-modified CNTs. The application of CNT-porphyrin composites permitted a substantial improvement of the signal to noise ratio and the possibility to measure several analytes odor threshold by QMB sensor array. (C) 2010 Published by Elsevier Ltd.
SWCNTs Modified with Porphyrin Units for Chemical Sensing Applications
Santonico M;Pennazza G.;
2010-01-01
Abstract
In the present work the composites of the amide- and glycyl-functional porphyrin monomers and single wall carbon nanotubes (SWCNTs) were formulated and then applied as novel sensing materials in a quartz crystal microbalance (QMB) sensory array with an integrated preconcentration unit. Two strategies have been adopted for CNT-prophyrin composites design. In the first approach the electropolymerisation of pyrrole-substituted porphyrin monomers occurred via formation of conjugated positively charged polypyrrole backbone, while negatively charged CNT functionalized with carboxylic groups acted as a polymer dopants. In the second case the CNT-porphyrin composites were chemically synthesized via the amide bond formation between carboxylic groups of functionalized CNTs and amino-substituent of prophyrin or via interaction between glycyl-substituted porphyrin monomers and non-modified CNTs. The application of CNT-porphyrin composites permitted a substantial improvement of the signal to noise ratio and the possibility to measure several analytes odor threshold by QMB sensor array. (C) 2010 Published by Elsevier Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
