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Molecular Imprinted Titania Sol–Gel Layer for Conductometric Sensing of p-Nitrophenol

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Molecularly imprinted titania based conductometric sensor was developed for selective recognition of p-nitrophenol. Titania sol–gel layer imprinted with p-nitrophenol was synthesized and characterized for its rebinding efficiency. Fourier transform infrared spectroscopy (FTIR) studies indicated the successful imprinting of template and its subsequent removal on washing. Scanning electron microscope (SEM) images of imprinted film before and after washing showed a significant change in porosity of molecular imprinted polymer (MIP) layer i.e., favoring analyte adsorption. The conductometric response of the developed sensor was tested for p-nitrophenol in the range of 0.01–0.1 mM. Non-imprinted titania layer was evaluated to compensate the non-specific binding interactions. Selectivity studies were also conducted by exposing equimolar solutions of para, meta and ortho nitrophenol to MIP layer. Results showed that MIP layer is highly responsive towards its template p-nitrophenol as compared to other isomers. The efficiency of regenerated layer was more than 85% of fresh titania layer even after ten rounds of analyses. Finally, imprinted titania layer was fabricated with Ag-nanoparticles for improving sensor response thus, developing composite layer material for enhanced recognition.
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Keywords: CONDUCTOMETRIC; MOLECULAR IMPRINTING; SENSORS; SOL–GEL; TITANIA

Document Type: Research Article

Publication date: November 1, 2014

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