Progresses of synthetic chemistry methodologies have allowed the preparation of a great variety of artificial receptors that are particularly appealing for chemical sensor development. In this paper, we investigate and compare the properties of gas sensors based on two types of devices, quartz microbalances (QMBs) and field effect transistors (FETs), which give the means to exploit the molecular recognition events occurring in non-conductive sensing layers formed by a thiol-modified cobalt tetraphenylporphyrin (CoTPPSH). Since QMB is sensitive to mass and FET is sensitive to electric dipoles, the resulting sensors are expected to exhibit different sensitivities and selectivities, although both based on the same sensing layer. In particular we show that the high sensitivity of CoTPPSH-coated FETs towards CO and NO is a consequence of the significant CoTPPSH electric dipole change after the gas coordination to the metal centre. © 2008 Elsevier B.V. All rights reserved.
Investigation of quartz microbalance and ChemFET transduction of molecular recognition events in a metalloporphyrin film / Di Natale, Corrado; Buchholt, Kristina; Martinelli, Eugenio; Paolesse, Roberto; Pomarico, Giuseppe; D'Amico, Arnaldo; Lundstrom, Ingemar; Lloyd Spetz, Anita. - In: SENSORS AND ACTUATORS. B, CHEMICAL. - ISSN 0925-4005. - 135:2(2009), pp. 560-567. [10.1016/j.snb.2008.09.055]
Investigation of quartz microbalance and ChemFET transduction of molecular recognition events in a metalloporphyrin film
Pomarico, Giuseppe;
2009
Abstract
Progresses of synthetic chemistry methodologies have allowed the preparation of a great variety of artificial receptors that are particularly appealing for chemical sensor development. In this paper, we investigate and compare the properties of gas sensors based on two types of devices, quartz microbalances (QMBs) and field effect transistors (FETs), which give the means to exploit the molecular recognition events occurring in non-conductive sensing layers formed by a thiol-modified cobalt tetraphenylporphyrin (CoTPPSH). Since QMB is sensitive to mass and FET is sensitive to electric dipoles, the resulting sensors are expected to exhibit different sensitivities and selectivities, although both based on the same sensing layer. In particular we show that the high sensitivity of CoTPPSH-coated FETs towards CO and NO is a consequence of the significant CoTPPSH electric dipole change after the gas coordination to the metal centre. © 2008 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
