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The paper discussed a novel structured light-addressable potentiometric sensor (LAPS) array based on PVC membrane for determination of heavy metal cations simultaneously. For LAPS array fabrication, part of the silicon substrate which was defined as non-sensitive area was heavily doped with boron and had thick oxide formation. Then PVC (polyvinyl chloride) membrane for respective cations (Pb2+, Cb2+, Zn2+) was prepared uniformly on corresponding sensitive area. Through new structure, the elaborated LAPS array had the advantages of excellent calibration stability (e.g. lower standard deviation from ±3.1mV to ±0.5mV for Pb-LAPS) and reasonable good selectivity. Sensors based on these membranes had showed a Nernstian response of slope (28.7-29.3mV/dec) over the concentration ranges of 10−5-10−1 mol/L. At the meantime, the electrochemical behavior in terms of the detection limit, linear response range, response time, long-time stability and effect of silanization had also been investegated.
| Authors: | D. Ha, N. Hu, C.X. Wu, Dmitry Kirsanov, Andrey Legin, Maria Khaydukova, P. Wang | |
| Journal: | Sensors and Actuators B: Chemical | |
| Year: | 2012 | |
| DOI: | 10.1016/j.snb.2012.06.032 | |
| Publication date: | 20-08-2012 |
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