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Fabrication and Characterization of Potassium Ion-Selective Electrode Based on Porous Silicon

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5 Author(s)
Zhu, Ziqiang ; Sch. of Inf. Sci. & Technol., East China Normal Univ., Shanghai ; Jian Zhang ; Jianzhong Zhu ; Wei Lu
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Porous-silicon (PS)-based potassium ion-selective microelectrode (K+ISME) was fabricated by using a microelectronic planar process and an electrochemical anodization etching technique. The apparent sensing area of the K+ISME is 100times100 mum 2. The response time t95% is 20 and 31 s when the concentration change is from low to high and vice versa, respectively. The potentials are constant at pH 2-8. The calibration curve for the K +ISME is linear within a wide range of pK=2.0~6.0. Its average slope during six months is 56.5 mV per decade, which is close to the Nernst response. The detection limit was found to be on the order of 5times10-7 M. The potentiometric selectivity coefficients (Ki,j pot) of the K+ ISE were 1.8 for NH 4 +, 3.6 for Li+, 4.1 for Na+, 4.5 for Mg2+, and 4.8 for Ca2+, respectively. Good performances of the K+ISME are attributed to large specific surface area and excellent adhesion between sensing membrane and the surface of PS

Published in:

Sensors Journal, IEEE  (Volume:7 ,  Issue: 1 )