An Eeg Electrode Based On Multilayer Graphene/TiO₂ Nanotubes Nanoarchitectures For Application In Robot Arm Control

With the development of brain-computer interface technology,Electroencephalogram（EEG）collection technology has been applied in various medical fields.Scalp electrodes are non-invasive and directly connect the brain to the outside world.At present,the dry electrode and the wet electrode coated with conductive gel have the disadvantages of high scalp contact impedance and poor wearing comfort respectively.Therefore,it is necessary to design a kind of EEG electrode with the advantages of high comfort and low contact impedance.In this paper,a Multilayer Graphene（MG）/Titanium dioxide（Ti O₂）nanotube array electrode was developed to record EEG signals by combining highly industrial chemical vapor deposition and anodic oxidation technologies.And realize the Brain Computer Interface（BCI）peripheral control application.The MG/Ti O₂electrode recorded scalp EEG signals in a non-contact capacitive mode,using saturated Na Cl aqueous solution or sweat as the electronic medium.The electrode can be worn quickly and comfortably,and the R_Scalpplaced in the hair area is only 13.4 kΩ,while the spontaneous EEG has a high signal to noise ratio（SNR）of76.8 d B,which has excellent stability in nearly 2 h of continuous use and a month of long-term use.In addition,the EEG electrode successfully recorded the visual evoked EEG signals in the no training mode.For the 16 stimulation frequencies of the steady-state visual evoked potential,the electrode fed back the evoked EEG signals with a SNR higher than 5.9 d B;and online control robot arm to write letters,with an average accuracy of approximately 90.3%.The MG/Ti O₂electrode has the advantages of easy wearing,low R_Scalp,and excellent stability,and is suitable for use in life and medical care fields such as brain control peripherals,long-term EEG collection for disabled people with mobility difficulties.