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    Langmuir-Blodgett monolayer of electrochemically synthesized PANI-TiO2 nanocomposites for MSG biosensor

    Year: 2022

    Journal: Appl. Surf. Sci. Adv., Volume 10, AUG

    Authors: Sharma, Devdutt; Dutta, Hemant Sankar; Dhayal, Marshal

    Organizations: Department of Biotechnology (Govt. of India) [BT/PR16223/NER/95/494/2016]; Central Instrument Facility, Indian Institute of Technol-ogy (BHU) Varanasi

    Keywords: Langmuir-Blodgett; Mono-sodium glutamate; Polyaniline-TiO2 nanocomposite; Cyclic voltammetry; Differential pulse voltammetry; Electrochemical immunosensor

    Nanocomposites of polyaniline titanium oxide (PANI-TiO2) have been synthesized by employing the electrochemical technique and their monolayers were prepared on a pre-chemical treated indium tin oxide (ITO) surface through Langmuir-Blodgett (LB) process. The TEM images show the well dispersion of an average similar to 5 nm diameter TiO2 particles in the film of PANI-TiO2 with similar to 0.35 nm interatomic spacing of titanium atoms in the anatase crystalline plane (101). X-ray photoelectron (XPS) spectra of LB film of PANI-TiO2 also confirmed the presence of Ti atoms as a similar observation was also confirmed in energy dispersive X-ray analysis (EDX) analysis of the film surface. Electrochemical conductivity of the PANI-TiO2 LB films showed enhancement in peak current, and subsequent immobilization of monoclonal antibodies specific to L-glutamic acid was achieved. Differential pulse voltammetry (DPV) measurements showed a linear response in the peak current with MSG concentration varying from 1 nM to 500 mu M and 1 mu M to 250 mu M in the electrolyte and tomato sauce, respectively. The detection sensitivity of the immunosensor was similar to 37 mA/nM.
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