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Organotrialkoxysilane-mediated synthesis of functional noble metal nanoparticles and their bimetallic for electrochemical recognition of L-tryptophan

Published online by Cambridge University Press:  14 July 2020

P.C. Pandey Open the ORCID record for P.C. Pandey [Opens in a new window] ,
Shubhangi Shukla ,
Govind Pandey  and
Roger J. Narayan
P.C. Pandey
Affiliation:
Department of Chemistry, Indian Institute of Technology (BHU), Varanasi, India. pcpandey.apc@iitbhu.ac.in
Shubhangi Shukla
Affiliation:
Department of Chemistry, Indian Institute of Technology (BHU), Varanasi, India. pcpandey.apc@iitbhu.ac.in
Govind Pandey
Affiliation:
Department of Pediatrics, King George Medical University, Lucknow, India, gvnd123@gmail.com
Roger J. Narayan*
Affiliation:
Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, NC, USA
*
roger_narayan@unc.edu
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Abstract

Effective and pH-sensitive electrochemical monitoring of L-tryptophan using noble metal nanocatalysts was evaluated in this study. This work examined the electrocatalytic influence of nanoparticles on the oxidation of amino acids with the variation of pH in working media. Bimetallic nanohybrids of palladium, silver, and gold (e.g., Pd/Ag and Pd/Au nanoparticles) were processed using organofunctionalized alkoxysilanes (3-aminopropyltrimethoxysilane (3-APTMS) and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane (EETMOS)) via a sequential reduction pathway. Transmission electron microscopy (TEM) demonstrated the role of the alkoxysilanes in determining the size of the nanoparticles and the distribution of metals in the core-shell configuration. The cluster-like morphology of PdNPs was remodeled to form bimetallic nanomaterials (Pd-AuNPs and Pd-AgNPs) with a core-shell structure. Enhancement in the electrooxidation behavior was shown to depend on the nanomaterial and the pH of the medium. The Pd-AgNPs modified electrode exhibited high sensitivity and selectivity, with characteristic amplification in cathodic peak current at lower oxidation potentials (0.659 V, 0.782 V, and 0.890 V at pH values 4, 7, and 9, respectively) due to its greater stability. Differential pulse voltammetric (DPV) scans were recorded over a wide range of concentrations from 0.1 μM to 1000μM; the Pd-AgNPs modified electrode showed the lowest limit of detection of 0.1μM at pH 4, 0.5 μM at pH 7, and 0.5 μM at pH 9.

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Articles
Information
MRS Advances , Volume 5 , Issue 46-47: Soft Materials and Biomaterials , 2020 , pp. 2429 - 2444
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Copyright © Materials Research Society 2020

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