Preparation of Cu2O/Cu-vertical graphene microelectrode and detection of uric acid/electroencephalogram
A Cu2O/Cu-vertical graphene microelectrode was prepared by combining Cu(Ⅱ)ion impregnation adsorp-tion and direct current(DC)arc plasma jet chemical vapor deposition methods for dual functions including electro-chemical detection of uric acid and recording electroencephalogram(EEG)signals.The morphology,microstructure,and crystal composition of the microelectrode were characterized using scanning electron microscopy,transmission electron microscopy,and X-ray diffraction,and the electrochemical and EEG recording capabilities were evaluated.The microelectrode was composed of vertically grown graphene nanosheets embedded with Cu2O/Cu nanoparticles,with a diameter of approximately 200 μm.Because these nanosheets are arranged into a three-dimensional porous structure,the microelectrode has a short ion diffusion path and a long conductive network,which promotes high elec-trocatalytic activity and electrical performance.The scalp-contact resistance of the microelectrode with physiologi-cal saline was as low as 7.05 kΩ.The signal-to-noise ratios of electromyography(EMG),electrooculogram(EOG),and EEG of the microelectrode were close to or exceeded those of a commercial wet electrode coated with conduc-tive gel.In addition,the microelectrode also electrochemically responded to uric acid,with a wide concentration range of 0.5-500 μmol·L-1 and a low detection limit of 0.024 μmol·L-1,as well as excellent anti-interference and long-term stability.
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