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A Highly Sensitive Nonenzymatic Glucose Sensor Based on Carbon Electrode Amplified with Pd x Cu y Catalyst
Author(s) -
Chowdhury Sreya Roy,
Mukherjee Parthasarathi,
Bhattacharya Swapan Kumar
Publication year - 2021
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202060268
Subject(s) - chronoamperometry , amperometry , ascorbic acid , cyclic voltammetry , catalysis , nanoparticle , detection limit , electrocatalyst , chemistry , inorganic chemistry , electrochemistry , nuclear chemistry , materials science , electrode , nanotechnology , chromatography , organic chemistry , food science
Approximately global Pd and Pd 94 Cu 6 alloy nano catalysts of average diameter 10.5 and 5.9 nm respectively, have been synthesized hydrothermally by wet chemical reduction and co‐reduction methods without addition of any capping agent. X‐ray diffraction and various microscopic studies are used to characterize the crystal phase and the morphology of the catalysts. Non‐enzymatic amperometric glucose sensors based on these synthesized catalyst materials are tested and compared in alkali at different potentials by cyclic voltammetry and chronoamperometry. The sensors characterized by fixed potential chronoamperometry are found to be sufficiently sensitive to glucose at different negative potentials like −0.65 V, −0.40 V, −0.10 V with respect to Hg/HgO electrode (E 0 ≈0.1 V), where the reactions of glucose oxidation are different. The sensor constructed with Pd 94 Cu 6 nanocatalyst shows an outstanding sensitivity of 10.1 mA cm −2 mM −1 which is considerably higher than that constructed with similarly synthesized Pd nanoparticles at any potential and that found in the literature of Pd based glucose sensors. The lower detection limit and response time obtained with Pd 94 Cu 6 nanoparticles are 10 μM and 3 s respectively. These sensors also exhibit high specificity to glucose and significant anti‐interference property against some common species like ascorbic acid (AA), uric acid (UA) and some monosaccharides whose interfering effects are found to decrease with decrease of potential of glucose oxidation. The electrocatalytic ability of the synthesized Pd and Pd 94 Cu 6 nanoparticles toward glucose oxidation has also found promising in blood sample at different potentials.