纳米级超微电极的研究(Ⅰ)——超微带电极的研制、表征及应用  

Investigations on Nanometer-Sized Ultramicroelectrodes( Ⅰ )——Fabrication, Characterization and Application of Ultramicrobandelectrode

作　　者：张学记[1] 张悟铭[1] 周性尧[1] 王柱[2] 

机构地区：[1]武汉大学化学系,武汉430072 [2]武汉工业大学新材料国家重点实验室

出　　处：《高等学校化学学报》1993年第7期927-930,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金;高等学校博士学科点专项科研基金

摘　　要：报道了纳米级超微带电极的制作方法,并分别用扫描隧道电镜、扫描电镜和光电子能谱对电极表面进行表征、用循环伏安法、计时电流法考察了电极的性能、将半微柱的扩散模型用于描述50nm以上的超微带电极,结果表明,超微带电极的带宽对电流变化影响不大,而非法拉第电流却正比于电极面积.用超微带电极可提高信噪比,测定亚铁氰化钾检测限可达5.0×10^(-7)mol/L.The present paper reports the investigation and application of nanometer-sized gold band ul-tramicroelectrodes. The surfaces of the electrodes are revealed by scanning tunneling microscopy (STM), scanning electron microscopy(SEM) and X-ray photoelectron spectrum(XPS) respectively. . Cyclic voltammetry and chronoamperometry are employed to characterize the electrodes. Diffusion model of hemicylinder microelectrode is employed to describe the diffusion behavior of ultramicroelec-trode whose band width is as small as 50 nm and the results obtained are satisfactory. Both theory and experimental results show that decrease of the band width has little effect on the faradic current at the ultramicrobandelectrodes, however, the non-faradic current is proportional to the area of those electrodes. So the higher signal to noise ratios are expected to obtained at those electrodes. Potassium fer-rocyanide is detected at 50 nm band ultramicroelectrode with 5. 0×10-7 mol/L detective limit.

关 键 词：纳米超微电极 超微带电极 

分 类 号：O646[理学—物理化学]