Affinity Control of Aminopropylsiloxane-based Organic/Inorganic Hybrids for Optical Sensors

摘要

The aminopropylsiloxane-based organic/inorganic hybrid is known as a sensitive material toward NO_2 gas for optical sensing systems but it has the irreversible detection.The affinity of the aminopropylsiloxane-based organic/inorganic hybrid toward NO_2 gas was controlled by incorporating an Nb inorganic component derived from Nb(OC_2H_5)_5 into the hybrid structure.The amino groups had a strong coordination bond with hydrolyzed Nb(OC_2H_5)_5 and/or an acid-base pair with an oxoanion formed by hydrolysis of Nb(OC_2H_5)_5.Thus,the strong solid-basicity of the aminopropylsiloxane-based organic/inorganic hybrid was weakened.The aminopropylsiloxane-based organic/inorganic hybrid containing an Nb inorganic component provided reversible sensing toward NO_2 gas in an optical sensing system.NO_2 is thought to be more weakly adsorbed because of the weakened basicity of the amino groups.