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Sensors 2006, 6(6), 680-687; doi:10.3390/s6060680

A Microsystem Based on Porous Silicon-Glass Anodic Bonding for Gas and Liquid Optical Sensing

1,* , 1, 2, 2, 1
1 and 1
1 Institute for Microelectronics and Microsystems, National Council of Research, Via P. Castellino 111, 80131 Naples, Italy 2 DIMET “Mediterranea” University of Reggio Calabria, Località Feo di Vito, 89060 Reggio Calabria, Italy
* Author to whom correspondence should be addressed.
Received: 15 March 2006 / Accepted: 22 June 2006 / Published: 23 June 2006
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We have recently presented an integrated silicon-glass opto-chemical sensor forlab-on-chip applications, based on porous silicon and anodic bonding technologies. In thiswork, we have optically characterized the sensor response on exposure to vapors of severalorganic compounds by means of reflectivity measurements. The interaction between theporous silicon, which acts as transducer layer, and the organic vapors fluxed into the glasssealed microchamber, is preserved by the fabrication process, resulting in optical pathincrease, due to the capillary condensation of the vapors into the pores. Using theBruggemann theory, we have calculated the filled pores volume for each substance. Thesensor dynamic has been described by time-resolved measurements: due to the analysischamber miniaturization, the response time is only of 2 s. All these results have beencompared with data acquired on the same PSi structure before the anodic bonding process.
Keywords: Porous Silicon; Anodic Bonding; Microchamber; Lab-on-Chip. Porous Silicon; Anodic Bonding; Microchamber; Lab-on-Chip.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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De Stefano, L.; Malecki, K.; Della Corte, F.G.; Moretti, L.; Rea, I.; Rotiroti, L.; Rendina, I. A Microsystem Based on Porous Silicon-Glass Anodic Bonding for Gas and Liquid Optical Sensing. Sensors 2006, 6, 680-687.

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