Abstract
This work presents an approach to tailor the properties of the graphene oxide- silver nanoparticle (GO-AgNPs) composite using room temperature atmospheric plasma treatment. In particular, the aerosolized deposition of graphene oxide-silver nanoparticle composite (GO-AgNPs), the rapid reduction of GO at room temperature, and AgNPs surface excitation are investigated in this work. The plasma treatment of aerosolized GO leads to the reduced graphene oxide (rGO) formation which is observed from the increase in D to G band ratio from 0.65 for GO to 1.2 for rGO in the Raman spectra. Scanning Electron Microscopy, Transmission Electron Microscopy, and Selected Area Electron Diffraction patterns show that the plasma treatment leads to the morphological changes and the Electrochemical Impedance spectroscopy results show the improvement in the conductivity of the rGO-AgNP composite. To demonstrate the efficacy of the technique, plasma treated GO and silver nanoparticles (AgNPs) composite is used for the electrode surface modification of the commercial screen-printed electrodes for the cortisol detection. The cyclic voltammetry scans to detect cortisol shows that the sensitivity of the surface modified electrodes is increased after plasma treatment. This room temperature atmospheric plasma annealing technique is of specific interest for rapid processing of nanoparticles on flexible surfaces without subjecting them to elevated temperatures.
Highlights
The graphene-based technologies have attracted significant interest, due to the better electrical, mechanical, thermal properties of graphene leading to better performance.[1]
This study showed the efficient reduction of Graphene oxide (GO) and an increase in the electrochemical performance of the plasma reduced graphene modified SPCE
The results show good repeatability which suggest the promising applications in Point of Care (POC) sensing
Summary
The graphene-based technologies have attracted significant interest, due to the better electrical, mechanical, thermal properties of graphene leading to better performance.[1]. The defects present in the rGO makes the electrolyte penetration easier than that of pure graphene.[2] There are several methods used to perform the GO reduction such as, thermal reduction,[3] chemical reduction,[4] electrochemical reduction[5] and plasma reduction.[6] these methods involve the complex experimental assembly and require the use of additional chemicals such as paraffin oil, CH4 gas insertion, chloroauric acid which are responsible for the reduction reaction. The reduced graphene oxide modified electrodes comprise of the desired defects on the surface to encapture the nanoparticles which provide the active binding sites for biosensing.[12,13] The Argon plasma generated in the presented work has the active hydrogen and argon radicals which are responsible for the GO reduction. The technique used in this work is capable of rapid reduction of GO at room temperature, atmospheric pressure and with the simple experimental setup
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