Journal
IEEE SENSORS JOURNAL
Volume 13, Issue 5, Pages 1413-1418Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2012.2235311
Keywords
Chitosan; lead ion; surface plasmon resonance; tert-butylcalix[4]arene-tetrakis(N,N-dimethylthioacetamide) (BCAT)
Funding
- Malaysian Government [5523901]
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Chitosan-based sensor thin films were fabricated to detect trace amounts of lead ion using surface plasmon resonance (SPR) optical sensor. The gold surface used for SPR measurements was modified with chitosan and chitosan-tert-butylcalix [4]arene-tetrakis(N,N-dimethylthioacetamide) (chitosan-BCAT). Both chitosan and chitosan-BCAT layers were deposited on the gold surface by spin coating technique. The experiment has been carried out to monitor the SPR signals for lead ion with sensitive enhancement by chitosan and chitosan-BCAT layers. For both layers, the change in resonance angle (Delta theta) is directly proportional to the concentration of lead ion solution. The higher amounts of Delta theta were obtained for chitosan-BCAT film due to a specific binding of BCAT with lead ion. The chitosan-BCAT film enhanced the sensitivity of detection down to 0.03 ppm. Data analysis also has been done by MATLAB software using Fresnel formula for multilayer system.
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