Novel structured light-addressable potentiometric sensor array based on PVC membrane for determination of heavy metals

作者：Ha D; Hu N; Wu C X; Kirsanov Dmitry; Legin Andrey; Khaydukova Maria; Wang P^*

来源：Sensors and Actuators B: Chemical , 2012, 174: 59-64.

DOI：10.1016/j.snb.2012.06.032

• Light-addressable potentiometric sensor (LAPS) array
• PVC membrane
• Cross-talk rejection
• Ion-selectivity
• Heavy metal cations

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 +/- 3.1 mV to +/- 0.5 mV for Pb-LAPS) and reasonable good selectivity. Sensors based on these membranes had showed a Nernstian response of slope (28.7-29.3 mV/dec) over the concentration ranges of 10(-5) to 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 investigated.

• 出版日期2012-11
• 单位浙江大学