SPECIAL ISSUE ON SPECTRAL SENSING RESEARCH FOR WATER MONITORING APPLICATIONS & FRONTIER SCIENCE AND TECHNOLOGY FOR CHEMICAL, BIOLOGICAL AND RADIOLOGICAL DEFENSE (VOL. 2) – Frontier Session; EDITED BY J. JENSEN AND D. WOOLARDNo Access

COUMARIN DYE AS A FLUORESCENCE SENSOR FOR METHANOL VAPOR

NATHAN STEVENS

Center for Analysis of Structures and Interfaces (CASI), Department of Chemistry, The City College of New York, Convent Avenue and 138th Street, New York, New York 10031, USA

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and

DANIEL L. AKINS

Center for Analysis of Structures and Interfaces (CASI), Department of Chemistry, The City College of New York, Convent Avenue and 138th Street, New York, New York 10031, USA

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https://doi.org/10.1142/S0129156408005278Cited by:0 (Source: Crossref)

Abstract

The sol-gel method has been employed in the fabrication of mesoporous composite films consisting of a nonionic surfactant, Pluronic P123, as the organic component, and silica as the inorganic component. The hybrid nature of these films resulted in their having an internal structure consisting of nanometer size self-assembled organic mesostructures surrounded by a silica framework. These films served as the host matrix for the laser dye coumarin 481 (C481) and an energy transfer complex formed between C481 and J-aggregated meso-tetra(4-sulfonatophenyl)porphyrin (TSPP). Upon exposure to methanol vapor, a rapid and reversible decrease in fluorescence intensity occurs for films containing C481 alone as well as containing both C481 and TSPP. Steady-state and time-resolved spectroscopic studies suggest that the decrease in fluorescence intensity is primarily due to an excited state interaction between methanol and C481; while, additionally, morphological changes within the film appear to play a role for films containing both C481 and TSPP.

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COUMARIN DYE AS A FLUORESCENCE SENSOR FOR METHANOL VAPOR

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