Monitoring penetration of ethanol in a porous silicon microcavity by photoluminescence interferometry
Year: 2001
Authors: Gaburro Z., Daldosso N., Pavesi L., Faglia G., Baratto C., Sberveglieri G.
Autors Affiliation: Univ Trent, Ist Nazl Fis Mat, I-38100 Trent, Italy; Univ Trent, Dept Phys, I-38100 Trent, Italy; Univ Brescia, Ist Nazl Fis Mat, I-25121 Brescia, Italy; Univ Brescia, Dept Chem & Phys, I-25121 Brescia, Italy.
Abstract: A photoluminescent porous silicon microcavity is exposed to saturated vapor of ethanol. The ethanol substitutes the air inside the pores giving rise to a progressive monotonic redshift of the interference pattern of the photoluminescence spectrum. On the other hand, the photoluminescence intensity of the cavity peak oscillates in time. Both effects can be explained in terms of a very simple model based on the progressive change of the effective refractive index of single layers of the cavity. The change is due to the difference between the index of refraction of air and ethanol. The result suggests that a porous silicon microcavity can be a tool to study the dynamics of gas penetration into porous silicon since it allows a monitoring of the depth reached by the ethanol at any given time. (C) 2001 American Institute of Physics.
Journal/Review: APPLIED PHYSICS LETTERS
Volume: 78 (23) Pages from: 3744 to: 3746
KeyWords: Gas Sensor Applications; Identification; Molecules; LayersDOI: 10.1063/1.1377040Citations: 28data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-17References taken from IsiWeb of Knowledge: (subscribers only)