TiO2 optical sensor for amino acid detection

Alla Tereshchenko; Roman Viter; Igor Konup; Volodymyr Ivanitsa; Sergey Geveliuk; Yuriy Ishkov; Valentyn Smyntyna

doi:10.1117/12.2044464

18 November 2013 TiO₂ optical sensor for amino acid detection

Alla Tereshchenko, Roman Viter, Igor Konup, Volodymyr Ivanitsa, Sergey Geveliuk, Yuriy Ishkov, Valentyn Smyntyna

Proceedings Volume 9032, Biophotonics—Riga 2013; 90320T (2013) https://doi.org/10.1117/12.2044464
Event: 1st International Conference "Biophotonics Riga 2013", 2013, Riga, Latvia

Abstract

A novel optical sensor based on TiO₂ nanoparticles for Valine detection has been developed. In the presented work, commercial TiO₂ nanoparticles (Sigma Aldrich, particle size 32 nm) were used as sensor templates. The sensitive layer was formed by a porphyrin coating on a TiO₂ nanostructured surface. As a result, an amorphous layer between the TiO₂ nanostructure and porphyrin was formed. Photoluminescence (PL) spectra were measured in the range of 370-900 nm before and after porphyrin application. Porphyrin adsorption led to a decrease of the main TiO₂ peak at 510 nm and the emergence of an additional peak of high intensity at 700 nm. Absorption spectra (optical density vs. wavelenght, measured from 300 to 1100 nm) showed IR shift Sorret band of prophiryn after deposition on metal oxide. Adsorption of amino acid quenched PL emission, related to porphyrin and increased the intensity of the TiO₂ emission. The interaction between the sensor surface and the amino acid leads to the formation of new complexes on the surface and results in a reduction of the optical activity of porphyrin. Sensitivity of the sensor to different concentrations of Valine was calculated. The developed sensor can determine the concentration of Valine in the range of 0.04 to 0.16 mg/ml.

Citation Download Citation

Alla Tereshchenko, Roman Viter, Igor Konup, Volodymyr Ivanitsa, Sergey Geveliuk, Yuriy Ishkov, and Valentyn Smyntyna "TiO₂ optical sensor for amino acid detection", Proc. SPIE 9032, Biophotonics—Riga 2013, 90320T (18 November 2013); https://doi.org/10.1117/12.2044464

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