A ruthenium(IV) disulfide based non-enzymatic sensor for selective and sensitive amperometric determination of dopamine

Deepika, J and Sha, Rinky and Badhulika, Sushmee (2019) A ruthenium(IV) disulfide based non-enzymatic sensor for selective and sensitive amperometric determination of dopamine. Microchimica Acta, 186 (7). ISSN 0026-3672

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Abstract

An electrochemical dopamine (DA) sensor has been fabricated by modifying a glassy carbon electrode (GCE) with ruthenium disulfide (RuS2) nanoparticles (NPs). FESEM and TEM micrographs show the NPs to have an average size of ~45 nm. XRD, Raman and EDS, in turn, confirm the successful formation of cubic phased RuS2 NPs. The modified GCE displays has attractive features of merit that include (a) an ultra-low detection limit (73.8 nM), (b) fast response time (< 4 s), (c) a low oxidation potential (0.25 V vs. Ag|AgCl), (d) excellent reproducibility and stability, (e) an electrochemical sensitivity of 18.4 μA μM−1 cm−2 and 1.8 μA.μM−1.cm−2 in the linear ranges from 0.1–10 μM of DA (R2 = 0.97) and 10–80 μM of DA (R2 = 0.99), respectively. The sensor exhibits excellent specificity over potential interferents like ascorbic acid, glucose and uric acid. The superior performance of the sensor is attributed to its high electrical conductivity, large electro-active surface, and large numbers of exposed catalytically active sites resulting from the presence of unreacted sulfur atoms.

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IITH Creators:
IITH CreatorsORCiD
Badhulika, Sushmeeorcid.org/0000-0003-3237-3031
Item Type: Article
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: Team Library
Date Deposited: 08 Jul 2019 06:00
Last Modified: 08 Jul 2019 06:00
URI: http://raiithold.iith.ac.in/id/eprint/5647
Publisher URL: http://doi.org/10.1007/s00604-019-3622-3
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