Microfabrication of nano-fractal electrodes for EEG application

Electro-encephalography is the recording of bio-potentials in the brain. Generally, needle electrodes are used for EEG application. However, with the advancement of technology, fractal electrodes have been developed recently and are as dry electrodes that do not require the use of gel. These days, with the facilities of nanotechnology and micro fabrication, new types of nano-electrodes with new materials are possible. In the present paper, design and micro-fabrication of new fractally coated nano-electrodes are discussed. The fabrication aspects under different environments for different configurations are given in detail. The work on selection of materials for optimum performance has been pursued which is presented here in brief. The testing of these electrodes on the laboratory phantoms and in vivo objects is given. These nanosize electrodes are very useful in the study and diagnosis of brain activity, particularly, in the form of an array housed in a bundle wrapped around the head over the skull. The nano fractal electrodes technique is quick, reliable and successful. The system can be made in portable form and the data can be telemetered easily in remote areas