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1、ModulationofSurfacePlasmoninNanocrystallineGold/DLCCompositeFilmsPreparedbyPlasmaCVDTechniqueR.PaulandAKPalDepartmentofInstrumentationScience,USICBuilding,JadavpurUniversity,Kolkata-700032,IndiaABSTRACTCompositefilmscontaininggoldnanoparticlesembeddedindiamond-likecarbon(
2、Au-DLC)matrixweredepositedonglassandSi(100)substratesbyusingcapacitativelycoupledplasma(CCP)chemicalvapourdepositiontechnique(CVD).Particlesizeandmetalvolumefractionvariedbetween2.7-3.5nmand0.04-0.7,respectivelywiththeamountofargoninthemethane+argongasmixtureintheplasma.B
3、ondingenvironmentinthesefilmswereobtainedfromXPS,RamanandFTIRstudies.MicrostructuralstudieswerecarriedoutbySEM,XRDandTEMstudies.Blue-shiftofthesurfaceplasmonresonancepeak(located~540-561nm)intheopticalabsorbancespectraofthefilmscouldbeassociatedwiththereductionofthepartic
4、lesizewhileredshiftwasassociatedwiththeincreaseinvolumefractionofmetalparticles.Theexperimentalresultshavebeendiscussedinlightofthecore-shellmodel.1.INTRODUCTIONNanoparticulategoldfilmsencapsuledindifferentmatrixhasbeenreportedbyanumberofgroups[1-10]duetotheirtechnologica
5、limportanceinmanyfields.Size-dependentelectrical,opticalandcatalyticproperties,biologicalassays,andsurface-enhancedRamanscattering(SERS)havebeenthesubjectofstudiesinrecentpast[11,12].Severalresearchers[5-7,9,10,13,14]havereportedtheirstudiesonopticalpropertiesofgoldorsilv
6、ernanoparticlesembeddedindielectricmatrixbyusingavarietyoftechniques.ThechoiceofthedielectricmatrixwaslimitedmainlytoSiO2,ZnO,TiO2,Al2O3andPMMA[13-17].Themainhurdletothewidespreadapplicationofmetalnanoparticlesistheiragglomerationduetohighsurfaceenergy[18,19].Severaltechn
7、iqueshavebeenproposedforthedepositionofmetalnanoparticlescontainingDLCfilms,whichincludeelectrochemical[17,20],sputterdeposition[21,22],plasma-enhancedchemicalvapordeposition[23],etc.Capacitativelycoupledplasmachemicalvapourdeposition(CCP-CVD)techniquebeingsimple,scalable
8、andcostcompetitivehasbeenwidelyusedtodepositDLCcoatings.SincetheDLCfilmsarelargebandgapmaterial,
