Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 212, Issue 8, Pages 1851-1857Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201431780
Keywords
electrochemical; electrical sensor; organic molecules; porous silicon
Funding
- Ministry of Higher Education, Kingdom of Saudi Arabia under the Promising Centre for Sensors and Electronic Devices (PCSED) at Najran University, Kingdom of Saudi Arabia [PCSED-019-12]
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An electrical sensor based on porous silicon (PSi) for the detection of various organic molecules in the liquid phase is demonstrated. PSi layers with a thickness of approximate to 4.5m and pore sizes in the range of 30nm were initially synthesized by the electrochemical anodization of a silicon wafer. Anodic oxidation of the mesoporous layers was conducted to passivate the surface and the electrical contacts were created exclusively onto the front porous film. Real-time measurements of conductance were performed at room temperature as a sensing response parameter. The as-fabricated sensors exhibit a sensitive and reversible response upon exposure to polar solvents including ethanol, methanol, acetone, and acetonitrile with a conductance increase. However, an irreversible response was detected upon the addition of non-polar molecules (n-hexane and toluene) with a conductance decrease. The response time covering both infiltration and evaporation times was in the order; acetone
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