title: Development of surface plasmon resonance sensor for determining zinc ion using novel active nanolayers as probe.
abstract: In this study, novel active nanolayers in combination with surface plasmon resonance (SPR) system for zinc ion (Zn(2+)) detection has been developed. The gold surface used for the SPR system was modified with the novel developed active nanolayers, i.e. chitosan and chitosan-tetrabutyl thiuram disulfide (chitosan-TBTDS). Both chitosan and chitosan-TBTDS active layers were fabricated on the gold surface by spin coating technique. The system was used to monitor SPR signal for Zn(2+) in aqueous media with and without sensitivity enhancement by TBTDS. For both active nanolayers, the shift of resonance angle is directly proportional to the concentration of Zn(2+) in aqueous media. The higher shift of resonance angle was obtained for chitosan-TBTDS active nanolayer due to a specific binding of TBTDS with Zn(2+). The chitosan-TBTDS active nanolayer enhanced the sensitivity of detection down to 0.1 mg/l and also induced a selective detection towards Zn(2+).
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia; Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, UPM Serdang, Selangor, Malaysia. Electronic address: yapwingfen@upm.edu.my.
authors.forename: Yap Wing
authors.initials: YW
authors.lastname: Fen
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: W Mahmood Mat
authors.initials: WM
authors.lastname: Yunus
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: Zainal Abidin
authors.initials: ZA
authors.lastname: Talib
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia; Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, UPM Serdang, Selangor, Malaysia.
authors.forename: Nor Azah
authors.initials: NA
authors.lastname: Yusof
mesh_terms: D048271:Chitosan / Q000737:chemistry / Q000378:metabolism; D006046:Gold; D057230:Limit of Detection; D008670:Metals / Q000032:analysis / Q000378:metabolism; D049329:Nanostructures / Q000737:chemistry*; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods*; D013893:Thiram / Q000737:chemistry; D015032:Zinc / Q000032:analysis* / Q000378:metabolism
chemical_list: D008670:Metals; D013893:Thiram; D006046:Gold; D048271:Chitosan; D015032:Zinc
keywords: Chitosan; Novel active nanolayer; Surface plasmon resonance; Tetrabutyl thiuram disulfide; Zinc ion