CAJ | 학술논문

传统的植入式电刺激微电极表面积小,电极/组织界面阻抗高,并且电荷存储容量(CSC)小,这些都会增加植入式系统的功耗并影响电刺激效果.提出了一种在电极点电镀铂黑的方法来增加微电极的有效面积(ESA).通过在超声波浴下使用脉冲电流电镀的方法,可以极大地增加微电极的ESA,降低界面阻抗并增加CSC和电荷注入容量.铂黑微电极的几何特性和电学特性分别由扫描电子显微镜( SEM)和电化学分析仪测定,并与未镀铂黑的电极特性进行了对比,对铂黑镀层的机械稳定性也做了相应的测试.实验结果表明,铂黑镀层的纳米结构使铂黑电极相比普通铂电极界面阻抗降低了1/16,CSC扩大13倍.在5min的室温超声波衰减实验中,阴极电荷存储容量( CSCC)仅减小20％.
전통적식입식전자격미전겁표면적소,전겁/조직계면조항고,병차전하존저용량(CSC)소,저사도회증가식입식계통적공모병영향전자격효과.제출료일충재전겁점전도박흑적방법래증가미전겁적유효면적(ESA).통과재초성파욕하사용맥충전류전도적방법,가이겁대지증가미전겁적ESA,강저계면조항병증가CSC화전하주입용량.박흑미전겁적궤하특성화전학특성분별유소묘전자현미경( SEM)화전화학분석의측정,병여미도박흑적전겁특성진행료대비,대박흑도층적궤계은정성야주료상응적측시.실험결과표명,박흑도층적납미결구사박흑전겁상비보통박전겁계면조항강저료1/16,CSC확대13배.재5min적실온초성파쇠감실험중,음겁전하존저용량( CSCC)부감소20％.
Conventional implantable electrical stimulation microelectrodes have small surface area,high electrode-tissue interface impedance and low charge storage capacity (CSC),which will increase power consumption and hinder stimulation effect.In this paper,a method was presented to increase the effective surface area(ESA) of microelectrode by coating Pt-black on the electrode sites.The method combines with electroplating Pt-black by pulse current under ultrasonic bath,which can significantly increase the ESA,decrease the interface impedance,and increase the CSC and charge-injection capacity.Moreover,the geometrical properties of Pt-black coated microelectrodes were demonstrated by using a scanning electron microscope(SEM) and the electrical properties were measured by an electrochemical analyzer compared with conventional microelectrodes without coatings.The mechanical stability of Pt-black coating was also tested.Experimental results show that approximately 16 times lower interface impedance and 13times higher CSC were achieved by this nanostructured microelectrode.Cathodal charge storage capacity ( CSCc ) decreased only by 20％ after an ultrasonic bath at room temperature for 5 min.