摘要
Thefundamentalmomentumconservationrequirementq~0fortheRamanprocessisrelaxedinthenanocrystallites(NCs),andphononsawayfromtheBrillouin-zonecenterwillbeinvolvedintheRamanscattering,whichiswell-knownasthephononconfinementeffectinNCs.ThisusuallygivesadownshiftandasymmetricbroadeningoftheRamanpeakinvariousNCs.Recently,theA'_1modeof1LMoS2NCsisfoundtoexhibitablueshiftandasymmetricbroadeningtowardthehigh-frequencyside[Chem.Soc.Rev.44(2015)2757andPhys.Rev.B91(2015)195411].Inthiswork,wecarefullycheckthisissuebystudyingRamanspectraof1LMoS2NCspreparedbytheionimplantationtechniqueinawiderangeofion-implanteddosage.ThesameconfinementcoefficientisusedforbothE'andA'_1modesin1LMoS_2NCssincethephononuncertaintyinanNCismainlydeterminedbyitsdomainsize.TheasymmetricalbroadeningneartheA′_1andE′modesisattributedtotheappearanceofdefect-activatedphononsatthezoneedgeandtheintrinsicasymmetricalbroadeningofthetwomodes,wheretheanisotropyofphonondispersioncurvesalongΓ-KandΓ-Misalsoconsidered.Thephotoluminescencespectraconfirmtheformationofsmalldomainsizeof1LMoS_2nanocrystallitesintheion-implanted1LMoS_2.Thisstudyprovidesnotonlyanapproachtoquicklyprobephonondispersiontrendsof2DmaterialsawayfromΓbytheRamanscatteringofthecorrespondingNCs,butalsoareferencetocompletelyunderstandtheconfinementeffectofdifferentmodesinvariousnanomaterials.
出版日期
2016年05月15日（中国期刊网平台首次上网日期，不代表论文的发表时间）
