| As a bridge between nerve tissue and nerve prosthesis,nerve interface electrode can help us understand the complex mechanism of central nervous system by studying the electrical activity of single neuron,better understand the mechanism of human body producing,transmitting and processing information,and provide high fidelity perception and control information for the development of practical neural prosthesis.However,most of the electrodes need to be implanted in the body,which will lead to a series of problems such as inflammation and infection.Therefore,it is necessary to develop a kind of body surface nerve electrode to meet the demand.Most of the body surface electrodes are not flexible enough,which is easy to get off the body surface in the process of movement,causing the failure of electronic devices.In addition,a variety of substrate materials are closely attached to the surface of skin tissue,which will cause different processes The degree of itching or inflammation has a negative effect on the organism.Based on the above problems,the research contents of this paper are as follows:(1)using thermoplastic polyurethane(TPU)and polydimethylsiloxane(PDMS)as raw materials,a three-dimensional porous fiber film was prepared by electrospinning technology,and the conductivity was given by the evaporation gold layer;(2)the adhesion between the gold layer and the substrate material was enhanced by the nano pile interlocking layer strategy,and the electrode was enhanced by polymer assisted deposition Conductive window;(3)to characterize the air permeability,adhesion,mechanics,electrochemistry and other properties of the electrode,and use it to monitor human movement(such as joint bending)and physiological electrical signals.The results showed that:(1)solution ratio and spinning parameters:TPU/PDMS mass ratio was 10:1,DMF and THF were selected as solvent to prepare electrospinning solution,the spinning voltage was set at 15 k V,the propulsion speed was 1 m L.h-1,and the samples were collected on the electrode plate which was 15 cm away from the nozzle and heated to 90?;(2)Compared with TPU/PDMS electrospun films,the mechanical properties of the films were effectively improved.The elongation at break increased from 261.65%when PDMS was not adhered to PDMS to 406.9%after adhesion to five parts of PDMS,and the elastic modulus also increased from 0.321 to0.707 MPa.The water vapor transmission capacity of TPU/PDMS electrospun film is0.0925 g.cm-2.min-1,which is obviously better than that of the flat film,and the adhesion strength also increased from 2.41 MPa to 4.08 MPa.The results show that the interface impedance decreases slightly,and the charge storage density increases from 0.141 m C.cm-2 to 0.280 m C.cm-2 of electrospun film,and then to 0.963 m C.cm-2 after adhesion of five parts of PDMS.In the aspect of tensile conductivity,it can still meet the requirements of electrode recording signal when the tensile ratio reaches125%,and the stable current recording can be maintained during 2000 cycles of stretching;(3)The sample successfully tracked the bending motion of the main joints(such as finger joint,wrist joint,etc.)by detecting the change of current value caused by the change of strain.In addition,through the rapid and real-time detection of potential changes,we can monitor various forms of human physiological signals in the way of interaction with users for medical diagnosis and disease prevention. |
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