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dc.contributor.authorHuang, G. Stevenen_US
dc.contributor.authorWang, Meng-Teen_US
dc.contributor.authorSu, Chia-Weien_US
dc.contributor.authorChen, Yu-Shiunen_US
dc.contributor.authorHong, Meng-Yenen_US
dc.date.accessioned2014-12-08T15:13:14Z-
dc.date.available2014-12-08T15:13:14Z-
dc.date.issued2007-10-31en_US
dc.identifier.issn0956-5663en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.bios.2007.04.011en_US
dc.identifier.urihttp://hdl.handle.net/11536/10213-
dc.description.abstractA heavy metal ion sensor was constructed by cross-linking melanin onto the gold electrode of quartz crystal microbalance (QCM). A mercury ion sensitivity of 518 +/- 37 Hz/ppm was observed, a substantial increase in sensitivity compared to previous reports of 10-50 Hz/ppm with the limit of detection at 5 ppb. Detection of other metal ions including Sn2+, Ge4+, Li+, Zn2+, Cu2+, Bi3+, Co2+, Al3+, Ni2+, Ag+, and Fe3+ were also performed. Unexpectedly, binding of Mn7+, Ph2+, Cd2+, and Cr3+ increased resonant frequencies. The surface profile of melanin thin film upon binding to metal ions was investigated by atomic force microscopy (AFM). Structural change of melanin upon binding to metal ions was characterized by circular dichroism and by infrared spectroscopy. The current study provides the first example of melanin-coated piezoelectric sensor showing high sensitivity and selectivity to metal ions. (c) 2007 Elsevier B.V. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectquartz crystal microbalanceen_US
dc.subjectmelaninen_US
dc.subjectheavy metalen_US
dc.subjectconformational changeen_US
dc.subjectcircular dichroismen_US
dc.subjectinfrared spectroscopyen_US
dc.titlePicogram detection of metal ions by melanin-sensitized piezoelectric sensoren_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.bios.2007.04.011en_US
dc.identifier.journalBIOSENSORS & BIOELECTRONICSen_US
dc.citation.volume23en_US
dc.citation.issue3en_US
dc.citation.spage319en_US
dc.citation.epage325en_US
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.department材料科學與工程學系奈米科技碩博班zh_TW
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
dc.contributor.departmentGraduate Program of Nanotechnology , Department of Materials Science and Engineeringen_US
dc.identifier.wosnumberWOS:000250612700002-
dc.citation.woscount21-
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