An efficient disposable and flexible electrochemical sensor based on a novel and stable metal carbon composite derived from cocoon silk
2019
Abstract The present work reports
cocoonsilk
fibroin(SF)as a unique precursor for the in-situ fabrication of
well-engineered, stable and leach free gold nanoparticle doped carbonaceous materials (AuNPs@NSC). In principle, at the molecular level, SF has a singular structure that can be converted to a N-doped aromatic carbon structure by heat treatment. The electrochemical properties of the prepared nanocomposite were examined by cyclic
voltammetryand
differential pulse voltammetry. A flexible three electrode sensor system with AuNPs@NSC-modified
working electrodeshas been developed, to achieve easy operation and quick and accurate responses. The electrochemical results showed that the sensor made by the AuNPs@NSC-modified
working electrodedemonstrated high sensitivity for the detection of
rutin, which is attributed to the good distribution of the AuNPs on the carbon matrix. Using
differential pulse voltammetry(
DPV), the AuNPs@NSC electrode was found to have a linear response in the range of 0.11–250 μM and a comparably low limit of detection of 0.02 μM (S/N = 3). To ensure the accuracy and applicability of the sensors, the concentration of
rutinin the commodity (
rutincapsule, 10 mg/capsule) was examined, and the sensor provided high precision with a minimum relative error (RE) of 3.3%. These findings suggest that AuNPs@NSC can be considered to be a potential electrode material for the development of electrochemical devices and has great potential in extending their application to the flexible sensor field.
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