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The UV-vis absorbance spectrum of LB film assemblies of 5,10,15,20-tetrakis(3,4-bis[2-ethylhexyloxyphenyl])-21H,23H-porphine is very sensitive to low concentrations of NO 2 . LB films prepared at very high deposition rates (~1000 mm min -1 ) yield t 50 response and recovery times of 25 and 33 s, respectively, and show a sensitivity of 60% relative absorbance change...
We investigated the O H stretching frequencies of geminal and triple hydroxyl groups on silica surface by FT-IR spectroscopy. The geminal and triple hydroxyl groups were individually prepared by the chemical reaction of alkylchlorosilane with surface isolated hydroxyl groups which are separated enough and following hydroxylation of surface chlorine groups. The O H stretching frequencies of these...
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