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Article: Molecular imaging of banknote and questioned document using solvent-free gold nanoparticle-assisted laser desorption/ionization imaging mass spectrometry

TitleMolecular imaging of banknote and questioned document using solvent-free gold nanoparticle-assisted laser desorption/ionization imaging mass spectrometry
Authors
KeywordsColoring Agents - chemistry
Forensic Sciences - methods
Gold - chemistry
Lasers
Metal Nanoparticles - chemistry
Issue Date2011
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/ac
Citation
Analytical Chemistry, 2011, v. 83 n. 1, p. 453-458 How to Cite?
AbstractDirect chemical analysis and molecular imaging of questioned documents in a non/minimal-destructive manner is important in forensic science. Here, we demonstrate that solvent-free gold-nanoparticle-assisted laser desorption/ionization mass spectrometry is a sensitive and minimal destructive method for direct detection and imaging of ink and visible and/or fluorescent dyes printed on banknotes or written on questioned documents. Argon ion sputtering of a gold foil allows homogeneous coating of a thin layer of gold nanoparticles on banknotes and checks in a dry state without delocalizing spatial distributions of the analytes. Upon N 2 laser irradiation of the gold nanoparticle-coated banknotes or checks, abundant ions are desorbed and detected. Recording the spatial distributions of the ions can reveal the molecular images of visible and fluorescent ink printed on banknotes and determine the printing order of different ink which may be useful in differentiating real banknotes from fakes. The method can also be applied to identify forged parts in questioned documents, such as number/writing alteration on a check, by tracing different writing patterns that come from different pens. © 2010 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/134346
ISSN
2015 Impact Factor: 5.886
2015 SCImago Journal Rankings: 2.369
ISI Accession Number ID
Funding AgencyGrant Number
Area of Excellence SchemeAoE/P-10/01
Funding Information:

We thank Mr. Frankie Y.-F. Chan and Ms. Amy S.-L. Wong of the Electron Microscope Unit of The University of Hong Kong for technical assistance in SEM measurements. This project is supported by the Area of Excellence Scheme (Grant AoE/P-10/01) administered by the University Grant Council (Hong Kong SAR, China) and the Strategic Research Theme on Drug administrated by The University of Hong Kong. The reproduction of images of Hong Kong banknote in any format is prohibited by the law of The Hong Kong Special Administrative Region. A written consent has been obtained from The Hong Kong Monetary Authority for showing all images of the Hong Kong banknotes in this Article. Accurate mass information and fragmentation patterns of the characteristic ions detected in the banknotes are not determined in this study to avoid disclosure of the security information of the banknote.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorTang, HWen_HK
dc.contributor.authorWong, MYMen_HK
dc.contributor.authorChan, SLFen_HK
dc.contributor.authorChe, CMen_HK
dc.contributor.authorNg, KMen_HK
dc.date.accessioned2011-06-17T09:18:25Z-
dc.date.available2011-06-17T09:18:25Z-
dc.date.issued2011en_HK
dc.identifier.citationAnalytical Chemistry, 2011, v. 83 n. 1, p. 453-458en_HK
dc.identifier.issn0003-2700en_HK
dc.identifier.urihttp://hdl.handle.net/10722/134346-
dc.description.abstractDirect chemical analysis and molecular imaging of questioned documents in a non/minimal-destructive manner is important in forensic science. Here, we demonstrate that solvent-free gold-nanoparticle-assisted laser desorption/ionization mass spectrometry is a sensitive and minimal destructive method for direct detection and imaging of ink and visible and/or fluorescent dyes printed on banknotes or written on questioned documents. Argon ion sputtering of a gold foil allows homogeneous coating of a thin layer of gold nanoparticles on banknotes and checks in a dry state without delocalizing spatial distributions of the analytes. Upon N 2 laser irradiation of the gold nanoparticle-coated banknotes or checks, abundant ions are desorbed and detected. Recording the spatial distributions of the ions can reveal the molecular images of visible and fluorescent ink printed on banknotes and determine the printing order of different ink which may be useful in differentiating real banknotes from fakes. The method can also be applied to identify forged parts in questioned documents, such as number/writing alteration on a check, by tracing different writing patterns that come from different pens. © 2010 American Chemical Society.en_HK
dc.languageengen_US
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/acen_HK
dc.relation.ispartofAnalytical Chemistryen_HK
dc.subjectColoring Agents - chemistry-
dc.subjectForensic Sciences - methods-
dc.subjectGold - chemistry-
dc.subjectLasers-
dc.subjectMetal Nanoparticles - chemistry-
dc.titleMolecular imaging of banknote and questioned document using solvent-free gold nanoparticle-assisted laser desorption/ionization imaging mass spectrometryen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0003-2700&volume=83&issue=1&spage=453&epage=458&date=2011&atitle=Molecular+imaging+of+banknote+and+questioned+document+using+solvent-free+gold+nanoparticle-assisted+laser+desorption/ionization+imaging+mass+spectrometry-
dc.identifier.emailChe, CM:cmche@hku.hken_HK
dc.identifier.emailNg, KM:kwanmng@hku.hken_HK
dc.identifier.authorityChe, CM=rp00670en_HK
dc.identifier.authorityNg, KM=rp00766en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/ac1020485en_HK
dc.identifier.pmid21117626-
dc.identifier.scopuseid_2-s2.0-78650766938en_HK
dc.identifier.hkuros185591en_US
dc.identifier.hkuros246940-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78650766938&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume83en_HK
dc.identifier.issue1en_HK
dc.identifier.spage453en_HK
dc.identifier.epage458en_HK
dc.identifier.isiWOS:000285570600063-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectInstitute of molecular technology for drug discovery and synthesis-
dc.identifier.scopusauthoridTang, HW=16231745000en_HK
dc.identifier.scopusauthoridWong, MYM=37076134600en_HK
dc.identifier.scopusauthoridChan, SLF=27167455400en_HK
dc.identifier.scopusauthoridChe, CM=7102442791en_HK
dc.identifier.scopusauthoridNg, KM=26026091100en_HK

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