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1、ANALYTICALSCIENCESAUGUST2011,VOL.277752011©TheJapanSocietyforAnalyticalChemistryReviewsSurface-EnhancedRamanScattering:APowerfulToolforChemicalIdentificationKwanKIM*†andKuanSooSHIN**†*DepartmentofChemistry,SeoulNationalUniversity,Seoul151-742,Korea**Departm
2、entofChemistry,SoongsilUniversity,Seoul156-743,KoreaThenatureof“hotspots”insurface-enhancedRamanscattering(SERS)andthenovelfabricationofAgthinfilmsforefficientSERSmeasurementsarethemainfocusofthisreview.Byusing4-aminobenzenthiolor1,4-phenylenediisocyanidemo
3、leculeswecancharacterizethenanogapformedbyametalnanoparticleandaflatmetalsubstrate,orthegapbetweentwosphericalmetalnanoparticles.ThesenanogapsareindeedSERS-activesitesandtheapparentsizeof“hotspots”isfoundtobeverylimited.TouseSERSforroutinechemicalidentifica
4、tions,thesubstratesshouldbestable,reproduciblyprepared,inexpensive,andeasytomake.WeintroduceamethodforthefacilefabricationofAgthinfilms,simplybysoakingglasssubstratesinethanolicsolutionsofAgNO3andbutylamine,andtheirapplicationasefficientSERSsubstrates.Ag-co
5、atedglasscapillaryandAgdepositedmagneticnanoparticlescanbeusedforthemicroanalysisofbio-andhazardouschemicals.(ReceivedMarch16,2011;AcceptedApril26,2011;PublishedAugust10,2011)1Introduction7753·2Ag-coatedglasscapillaryforminute2TheNatureof“HotSpots”inSERS776
6、chemicalanalysis2·1Nanogapsformedbynanoparticlesand3·3Ag-coatedmagneticparticlesforaflatsubstratetheinductionofSERS2·2Agnanoparticle-mediatedinductionofSERS3·4Ag-coatedbeadsforSERS-based2·3Surfacepotentialofmetalnanoparticlesmolecularsensors2·4Sizeof“hotspo
7、ts”4ConclusionsandOutlook7823NovelFabricationofAgThinFilmsfor5Acknowledgements782EfficientSERS7786References7823·1FabricationofSERS-activeAgfilmsonglassRamansignalsformoleculesadsorbedonnanostructured1Introductioncoinagemetals.1–3Inrecentyears,ithasbeenrepo
8、rtedthatevensinglemoleculedetectionispossiblebysurface-enhancedSurface-enhancedRamanscattering(SERS)isanabnormalresonanceRamanscattering(SERRS),suggestingthatthesurfaceopticalphenomenonresultinginstron
