Observatorio de I+D+i UPM

Descripción
Solidly mounted resonators (SMRs) with a top carbon nanotubes (CNTs) surface coating that doubles as an electrode and as a sensing layer have been fabricated. The influence of the CNTs on the frequency response of the resonators was studied by direct comparison to identical devices with a top metallic electrode. It was found that the CNTs introduced significantly less mass load on the resonators and these devices exhibited a greater quality factor, Q (>2000, compared to ?1000 for devices with metal electrodes), which increases the gravimetric sensitivity of the devices by allowing the tracking of smaller frequency shifts. Protein solutions with different concentrations were loaded on the top of the resonators and their responses to mass-load from physically adsorbed coatings were investigated. Results show that resonators using CNTs as the top electrode exhibited a higher frequency change for a given load (?0.25 MHz cm2 ng?1) compared to that of a metal thin film electrode (?0.14 MHz cm2 ng?1), due to the lower mass of the CNT electrodes and their higher active surface area compared to that of a thin film metal electrode. It is therefore concluded that the use of CNT electrodes on resonators for their use as gravimetric biosensors is a significant improvement over metallic electrodes that are normally employed.
Internacional	Si
JCR del ISI	Si
Título de la revista	Sensors and Actuators B: Chemical
ISSN	0925-4005
Factor de impacto JCR	3,339
Información de impacto
Volumen	160
DOI	10.1016/j.snb.2011.09.083
Número de revista
Desde la página	1386
Hasta la página	1393
Mes	SIN MES
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• Autor: Enrique Iborra Grau (UPM)
• Autor: Marta Clement Lorenzo (UPM)
• Autor: Jimena Olivares Roza (UPM)
• Autor: Luis García-Gancedo (Electrical Engineering Division, University of Cambridge, Cambridge, United Kingdom)
• Autor: Z. Zhu (Electrical Engineering Division, University of Cambridge, Cambridge, United Kingdom)
• Autor: A. J. Flewitt (Electrical Engineering Division, University of Cambridge, Cambridge, United Kingdom)
• Autor: W. I. Milne (Electrical Engineering Division, University of Cambridge, Cambridge, United Kingdom)
• Autor: G. M. Ashley (Electrical Engineering Division, University of Cambridge, Cambridge, United Kingdom)
• Autor: J. K. Luo (Electrical Engineering Division, University of Cambridge, Cambridge, United Kingdom)
• Autor: X. B. Zhao (Electrical Engineering Division, University of Cambridge, Cambridge, United Kingdom)
• Autor: J. R. Lu (Electrical Engineering Division, University of Cambridge, Cambridge, United Kingdom)

• Creador: Grupo de Investigación: Microsistemas y Materiales Electrónicos
• Centro o Instituto I+D+i: Centro de Materiales y Dispositivos Avanzados para Tecnologías de Información y Comunicaciones
• Departamento: Tecnología Electrónica