POROUS SILICON BASED OPTICAL DEVICES FOR BIOCHEMICAL SENSING

Rea, Ilaria (2008) POROUS SILICON BASED OPTICAL DEVICES FOR BIOCHEMICAL SENSING. [Tesi di dottorato] (Inedito)

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Abstract

This thesis summarizes a three years scientific research investigation on the design and fabrication of porous silicon based optical devices for applications in the field of biochemical sensing. Porous silicon is an ideal transducer material due to its sponge-like morphology, characterized by a specific surface area up to 500 m2 cm-3, which assures an effective interaction with gas and liquid substances. Moreover, porous silicon is a low cost material, completely compatible with standard microelectronic processes. In this work, different porous silicon structures such as Fabry-Perot interferometer, Bragg mirror, optical microcavity, Thue-Morse sequences and optical waveguide have been realized and characterized as optical transducers for the monitoring of chemical and biological interactions. The selectivity, reversibility and sensitivity of these devices as optical sensors have been discussed. The porous silicon surface has been modified in order to gain chemical stability, proper wettability, and specific features such as biomolecules immobilization. Standard chemical functionalizations, but also an innovative pure biological passivation method based on selfassembled biofilms of the Hydrophobins proteins, have been successfully experimented. Some standard micromachining techniques, such as HF wet etching and anodic bonding, have been optimized to integrate the porous silicon sensing element into a Lab-on-Chip prototype. The integrated devices have been characterized as fast sensors of chemical compounds and response times shorter than 100 ms have been demonstrated. The Direct-Laser-Writing of the porous silicon surface, as alternative process to the photolithographic patterning in the device miniaturization has been also exploited. Finally, a bottom-up approach in microoptics has been developed by using the silica shells of some marine Diatoms, microalgae which show impressive morphological and physical analogies with porous silicon.

Tipologia di documento:Tesi di dottorato
Parole chiave:porous silicon, biosensing
Settori scientifico-disciplinari MIUR:Area 02 Scienze fisiche > FIS/03 FISICA DELLA MATERIA
Coordinatori della Scuola di dottorato:
Coordinatore del Corso di dottoratoe-mail (se nota)
Abbate, Giancarloabbate@na.infn.it
Tutor della Scuola di dottorato:
Tutor del Corso di dottoratoe-mail (se nota)
De Stefano, Lucaluca.destefano@na.imm.cnr.it
Stato del full text:Accessibile
Data:Ottobre 2008
Istituzione:Università degli Studi di Napoli Federico II
Dipartimento o Struttura:Scienze Fisiche
Tipo di tesi:Dottorato
Stato dell'Eprint:Inedito
Scuola di dottorato:Scuola di Dottorato in Ingegneria Industriale
Denominazione del dottorato:Tecnologie Innovative per Materiali, Sensori e Imaging
Ciclo di dottorato:XXI
Numero di sistema:3519
Depositato il:20 Novembre 2009 13:11
Ultima modifica:20 Novembre 2009 13:11

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