Tin disulfide nanorod-graphene-β-cyclodextrin nanocomposites for sensing dopamine in rat brains and human blood serum.

Affiliation

Division of Electrical and Electronic Engineering, School of Engineering, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, United Kingdom. Electronic address: [Email]

Abstract

In the present work describes a facile synthesis of tin disulfide (SnS2) nanorods decorated graphene-β-cyclodextrin (SnS2/GR-β-CD) nanocomposite for robust and novel dopamine (DA) electrochemical biosensor applications. The DA biosensor was fabricated using the glassy carbon electrode (GCE) modified with SnS2/GR-β-CD nanocomposite. The sonochemical and hydrothermal methods have been used for the synthesis of SnS2/GR-β-CD. Different physicochemical methods were used to confirm the formation of the GR-β-CD, SnS2, and SnS2/GR-β-CD nanocomposite. The cyclicvoltammetric cathodic current response of DA was 5 folds higher than those observed at bare, β-CD, SnS2-β-CD, and GR-β-CD modified GCEs. Under optimised conditions, the biosensor's DPV response current is linear to DA from the concentration of 0.01-150.76 μM. The detection limit of the biosensor was 4 nM. The SnS2/GR-β-CD biosensor shows an excellent selectivity towards DA in the presence of common interfering species, including ascorbic acid and uric acid. Also, the as-prepared nanocomposite-modified electrode exhibited satisfactory long-term stability, sensitivity (2.49 μAμM-1 cm-2) along with reusability for detection of DA. The fabricated SnS2/GR-β-CD biosensor was successfully used for the detection of DA in the rat brain and human blood serum samples.

Keywords

Biosensor,Dopamine,Graphene nanocomposite,Guest-host chemistry,SnS(2) nanorods,Sonochemical method,

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