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Nanostructures and porous silicon: activity at interfaces in sensors and photocatalytic reactors
Author(s) -
Gole James L.,
Lewis Stephen,
Lee Seungwoo
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200674369
Subject(s) - microreactor , microporous material , photocatalysis , nanostructure , materials science , porous silicon , silicon , nanotechnology , nanopore , porosity , mesoporous material , chemical engineering , optoelectronics , catalysis , chemistry , organic chemistry , composite material , engineering
Nanopore covered microporous porous silicon (PS) interfaces have been formed to provide an active scaffolding for the creation of sensor and microreactor configurations. Rapidly responding (≤2s), reversible, and sensitive (≤2 ppm), PS gas sensors, operating at room temperature, and based on a uniquely formed highly efficient electrical contract to the nanopore covered microporous array, are modified by introducing active nanoparticles to establish gas selectivity. In a complementary manner, active sites can be introduced for the purpose of forming a nanostructure based microreactor. Pulsing techniques and FFT analysis allow the gas response of the sensors to be measured, without saturation, and filtered on a drifting baseline to eliminate false positives and the effects of external noise. TiO 2– x N x visible light absorbing photocatalysts are introduced to quartz surfaces and to the PS structure for the purpose of creating a microreactor and subsequently to form the preconditioner for a solar pumped sensor. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)