کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1168009 | 1491152 | 2010 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Functionalization of micro- and nano-apertures with chromate-selective solvent polymeric membrane
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A new miniaturization approach to create micro- and nanoscale ion selective electrodes (ISEs) was demonstrated and the concept tested with an environmentally relevant chromate-selective membrane consisting of 7.7:62.2:31.1 wt % Aliquat336:2-NPOE:PVC. Apertures of 100 nM and 30 μM dimensions were made using MEMS fabrication techniques and functionalized through a macroscale application of solvent polymeric membrane. Performance studies for the microscale ISE showed a response slope of â58.6 ± 5.6 mV decadeâ1 and limit of detection (LOD) of 2.1 Ã 10â5 ± 1.1 Ã 10â5 M, versus â65.2 ± 4.2 mV decadeâ1 and 1.8 Ã 10â5 ± 6 Ã 10â6 M for the nanoscale ISE. This was consistent with control studies with carefully conditioned coated wire electrodes, which demonstrated a response slope of â61.7 ± 2.4 mV decadeâ1 and a LOD of 3.0 Ã 10â6 ± 1 Ã 10â6 M. Response times for the best micro- and nanoscale ISEs were in the 10-20 s timeframe. Electrical resistance measurements were in the GΩ range for the microscale ISEs and nanoscale ISEs. Appropriate ISE geometry was confirmed through AFM measurements and calculations based on electrical properties for micro- and nanoscale apertures. These micro- and nanoscale ISEs are expected to have significant impact in the field of microscale analytical processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 659, Issues 1â2, 5 February 2010, Pages 243-250
Journal: Analytica Chimica Acta - Volume 659, Issues 1â2, 5 February 2010, Pages 243-250
نویسندگان
Daniel C. Rieck, Bingwen Liu, Bong-Jae Park, David F. Moffett, David A. Kidwell, Gary J. Cheng, Bernard J. Van Wie,