Device for detection of organic solvents by silicon photolumines

Details Device for detection of organic solvents by silicon photolumines Device for detection of organic solvents by silicon photolumines

1994-06-28

1995-09-26

Valentine, Donald R.

Radiant energy

Luminophor irradiation

2504611, 2504831, 2041293, F21V 3300, G01J 158

Patent

active

054536243

ABSTRACT:
An n-type silicon (Si) wafer is galvanostatically etched in a hydrofluoric acid (HF)-containing solution while being illuminated with a 300 watt tungsten light source to form porous silicon with luminescent properties. Photoluminescence of the porous silicon is monitored using a short wavelength visible or ultraviolet light source and a monochromator/CCD detector assembly. Upon exposure to organic solvents, the photoluminescence is quenched. Within seconds of removal of the solvent, the original intensity is recovered and further exposure of the porous silicon to organic solvents will again result in quenching of the luminescence.

REFERENCES:
patent: 4409075 (1983-10-01), Kolbesen
patent: 4415414 (1983-11-01), Burton et al.
patent: 4800282 (1989-01-01), Nishimura
patent: 4874484 (1989-10-01), Foell et al.
patent: 5030009 (1991-07-01), Ando et al.

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