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Sensors 2009, 9(5), 3469-3490;

Feasibility Studies on Si-Based Biosensors

CNR – IMM Catania, Italy
Università degli Studi di Catania, Dipartimento di Chimica Biologica, Chimica Medica e Biologia Molecolare, Catania, Italy
Università degli Studi di Catania, Dipartimento di Scienze Biomediche, Catania, Italy
Laboratorio Superfici e Interfasi (SUPERLAB), Consorzio Catania Ricerche, Catania, Italy
Author to whom correspondence should be addressed.
Received: 20 February 2009 / Revised: 6 April 2009 / Accepted: 9 April 2009 / Published: 11 May 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Italy)
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The aim of this paperis to summarize the efforts carried out so far in the fabrication of Si-based biosensors by a team of researchers in Catania, Italy. This work was born as a collaboration between the Catania section of the Microelectronic and Microsystem Institute (IMM) of the CNR, the Surfaces and Interfaces laboratory (SUPERLAB) of the Consorzio Catania Ricerche and two departments at the University of Catania: the Biomedical Science and the Biological Chemistry and Molecular Biology Departments. The first goal of our study was the definition and optimization of an immobilization protocol capable of bonding the biological sensing element on a Si-based surface via covalent chemical bonds. We chose SiO2 as the anchoring surface due to its biocompatibility and extensive presence in microelectronic devices. The immobilization protocol was tested and optimized, introducing a new step, oxide activation, using techniques compatible with microelectronic processing. The importance of the added step is described by the experimental results. We also tested different biological molecule concentrations in the immobilization solutions and the effects on the immobilized layer. Finally a MOS-like structure was designed and fabricated to test an electrical transduction mechanism. The results obtained so far and the possible evolution of the research field are described in this review paper. View Full-Text
Keywords: Si-based biosensors; biological molecules immobilization; glutaraldehyde; glucose oxidase; DNA strands; metallothioneines; microelectronic compatibility Si-based biosensors; biological molecules immobilization; glutaraldehyde; glucose oxidase; DNA strands; metallothioneines; microelectronic compatibility
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Libertino, S.; Aiello, V.; Scandurra, A.; Renis, M.; Sinatra, F.; Lombardo, S. Feasibility Studies on Si-Based Biosensors. Sensors 2009, 9, 3469-3490.

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