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access icon free Facile synthesis of gold nanoparticles using carbon dots for electrochemical detection of neurotransmitter, dopamine in human serum and as a chemocatalyst for nitroaromatic reduction

© The Institution of Engineering and Technology
Received 31/01/2018, Accepted 11/04/2018, Revised 09/04/2018, Published 13/04/2018

Herein, the authors reported a carbon dots mediated synthesis of gold nanoparticles (AuNPs) at room temperature. Transmission electron microscopy revealed that the AuNPs are spherical in shape with a size of 10 nm. As-prepared AuNPs was immobilised on carbon paste electrode and subjected to electrochemical sensing of an important neurotransmitter dopamine. Differential pulse voltammetry studies revealed sensitive and selective determination of dopamine in the presence of commonly interfering ascorbic acid and uric acid. The linear detection range was 10–600 μM and the limit of detection was 0.7 ± 0.18 μM. The practical application was demonstrated by measuring dopamine in human blood serum and urine samples. The catalytic activity of AuNPs was evaluated by sodium borohydride mediated reduction of nitroaromatic compounds. The reduction kinetics was found to be pseudo-first-order kinetics. All the tested nitroaromatics reduced to corresponding amines in <10 min.

Inspec keywords: transmission electron microscopy; biosensors; electrochemical electrodes; chemical variables measurement; carbon; electrochemical sensors; reduction (chemical); gold; nanosensors; organic compounds; catalysts; catalysis; particle size; nanofabrication; voltammetry (chemical analysis); blood; nanoparticles

Other keywords: chemocatalyst; nitroaromatic reduction; room temperature; electrochemical sensing; human blood serum; temperature 293 K to 298 K; nitroaromatic compounds; neurotransmitter dopamine; urine samples; uric acid; linear detection range; gold nanoparticles; pseudofirst-order kinetics; reduction kinetics; catalytic activity; ascorbic acid; carbon dots mediated synthesis; C-Au; sodium borohydride mediated reduction; carbon paste electrode; amines; transmission electron microscopy; differential pulse voltammetry

Subjects: Electrochemical analytical methods; Other methods of nanofabrication; Heterogeneous catalysis at surfaces and other surface reactions; Chemical sensors; Sensing and detecting devices; Electrochemistry and electrophoresis; Chemical variables measurement; Chemical sensors; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Specific chemical reactions; reaction mechanisms; Biosensors; Microsensors and nanosensors; Biological engineering and techniques; Biosensors

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