7 December 1992 Sol-gel/rhodamine 6G composite films with tailored microstructures
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A multi-step hydrolysis procedure was developed to prepare composite organic dye/sol-gel thin films with variable porosity for such applications as switches or sensors. Variation of acid and base catalyzed hydrolysis sequences of three sols prepared from tetraethoxysilane with identical H2O/Si ratios, dilution factors, and pH resulted in considerably different silicate speciation. Under conditions where monomer was avoided, the refractive indices of as- deposited films could be varied by an aging step prior to film deposition. This general strategy, which relies on the aggregation of fractal polymeric clusters, is compatible with the low temperature and near neutral pH requirements of both organic dyes and biologically-active species such as enzymes.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Deborah L. Logan, Deborah L. Logan, Carol S. Ashley, Carol S. Ashley, Roger A. Assink, Roger A. Assink, C. Jeffrey Brinker, C. Jeffrey Brinker, "Sol-gel/rhodamine 6G composite films with tailored microstructures", Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992); doi: 10.1117/12.132044; https://doi.org/10.1117/12.132044

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