کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
196104 459832 2006 9 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Positive and negative AC impedance feedback observed above conductive substrates under SECM conditions
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موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Positive and negative AC impedance feedback observed above conductive substrates under SECM conditions
چکیده انگلیسی

A relationship between the tip response and the tip-to-substrate separation distance was investigated under alternating current scanning electrochemical microscopy (AC-SECM) conditions. For insulating substrates only negative AC feedback was observed. However, in the case of conductive substrates positive as well as negative AC feedback could be observed depending on experimental conditions. The theoretical model proposed in this work explains very well all observed trends and allows for qualitative predictions of the tip impedance in AC-SECM as a function of various experimental conditions (including: frequency, the supporting electrolyte concentration, the tip-to-sample separation distance and the tip diameter). In this theoretical model the double-layer capacitance of the tip and the sample is represented by a constant phase element (CPE), rather than an ideal capacitor. The paper also describes how raw experimental impedance data can be corrected for imperfections of the measuring system.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 52, Issue 3, 12 November 2006, Pages 854–862
نویسندگان
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