A silicon sensor for SO2
Article Abstract:
The photoluminescent property of porous silicon makes it a highly sensitive sensor for sulphur dioxide because oxide-coated porous silicon is quickly and reversibly quenched by gas-phase SO2. Unlike quenching by gas-phase and aqueous Bronsted bases, in SO2 quenching, removal of SO2 source results in restoration of loss of photoluminescence. Reactivity toward SO2 lasts for several weeks. Eventually the oxidised silicon layer thickens and the quenching response weakens. The sensitivity and selectivity of porous silicon for SO2 sensing has applications in environmental monitoring.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Photocurrent generation in metal bisphosphonate multilayer thin films
Article Abstract:
Thin films containing p-phenylenediamine donor layers and viologen-based acceptor layers generate photocurrents on irradiation with ultraviolet and visible light. The process of preparation of the metal bisphosphonate multilayer films allows manipulation of the structure and composition of the multilayer. Efficient photoinduced charge separation and reversal of the electron flow is possible in the films. The preparation and characterization of the multilayer films are discussed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Stable photoinduced charge separation in layered viologen compounds
Article Abstract:
Solar energy can be stored efficiently using the photochromic properties of layered zirconium phosphonate/viologen compounds. These compounds create the necessary state of photoinduced charge transfer by taking on a charge-separated state that is long-lasting in air. Spectroscopic analysis shows that the resulting photoproduct is the dialkyl viologen radical cation that originates from the interlamellar region of the zirconium phosphonate.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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