P2.3.1 Multiple Sensing and Imaging of Heavy Metal Ions Based on New Structural Lightaddressable Potentiometric Sensor Array

14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany
P2.3 Sensors Based on Optical Techniques
D. Ha, N. Hu, C. Wu, L. Du, P. Wang - Biosensor National Special Laboratory, Key Laboratory for Biomedical Engineering of Education Ministry, Department of Biomedical Engineering, Zhejiang University (P. R. China), D. Kirsanov, A. Legin, M. Khaydukova - Laboratory of Chemical Sensors, Chemistry Department, Saint-Petersburg State University (Russia)
1447 - 1450


A novel structural light-addressable potentiometric sensor (LAPS) array was proposed for reducing the noise interference induced into the measurement system when light beam illuminated the nonsensitive regions. We improved the noise rejection of LAPS array with boron heavily doping and thick oxide formation on corresponding areas. Through the modification of the individual sensitive region with Polyvinyl Chloride (PVC) membrane containing specific receptor molecules, relevant cations (Pb2+, Cd2+, Zn2+) were detected simultaneously. The new structural LAPS array had the advantages of excellent calibration stability (lower standard deviation) and reasonable good selectivity. Sensors based on these membranes had showed a Nernstian response of slope (28.7-29.3 mV/decade) over the concentration ranges of 10^-5-10^-1 mol/L. Other sensor performance was evaluated in terms of detection limit, linear response range, response time and effect of silanization. Meanwhile, chemical imaging was applied to investigate the distribution of a certain solution and concentration gradient when LED array acted as light source.