Direct Current Plasma-Sputtered Gold Nanoparticles/ Carbon Nanosheets Nanohybrid Structures for Electrochemical Sensors
Pireaux, A. Achour, M. Islam, F. Moulai, E. Haye, I. Ahmad, K. Saeed, S. Parvez, J. F. Colomer, and J. J. . 2019
Multifunctional nanohybrid materials such as gold (Au) nanoparticles attached to the carbon nanostructures can be incorporated into devices for in vivo/in vitro detection of various analytes, catalysis and imaging purposes. In this work, vertically aligned carbon nanosheets (CNS) were grown over a silicon substrate, followed by direct current plasma-sputtered deposition of Au at different times. The Au-CNS hybrid nanostructures so produced were characterized for surface and cross-sectional morphologies, phase composition and surface chemistry by means of scanning electron microscope, x-ray diffraction and x-ray photoelectron spectroscope techniques. The Au-CNS exhibit vertically aligned, dendritic wall morphology with different degrees of dispersion on the substrate. The electrochemical (EC) behavior of the different Au-CNS samples were investigated for application as electrochemical transductors. The EC activity was investigated by both cyclic voltammetry and electrochemical impedance spectroscopy in the presence of [Fe(CN)6]3-/4-. The variations in active surface area and roughness of different electrodes were evaluated in order to explore the application of such Au-NS in the EC biosensors operating via the direct electron transfer process. The EC results show remarkable properties such as high diffusion coefficient (Do), low peak to peak separation value (DE) for the oxidation and reduction processes of the [Fe(CN)6]3-/4- redox system
and low surface resistivity. Such Au-CNS nanohybrid structures are promising for use in photoelectrochemical cells, sensing devices, catalysis, surface-enhanced Raman spectroscopy and biotechnology applications.
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