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F4TCNQ/MoS2纳米复合异质材料的表面结构对SERS的影响
Fig.1.SEMimagesof(a)pureMoS2and(b)gold-sprayedMoS2thinfilms;(c)(g)SEMimagesofF4TCNQ/MoS2(T1T5)withdifferentgrowthtimes(gold-sprayed);(f)thequantityandsizedistributionsofF4TCNQnanoislanddepositedonMoS2filmovertime.
图2(a),(b)MoS2薄膜边缘处的AFM图和相应的高度图;(c),(d)小范围的MoS2薄膜表面的AFM图和相应高度图;(e)—(i)T1—T5样品的形貌图、沿图中直线扫描的高度和接触电势差谱线图
Fig.2.(a),(b)TheAFMimageandthecorrespondingheightprofileoftheedgeofMoS2film,respectively.(c),(d)TheAFMimageandthecorrespondingheightprofileofthesmallrangeofMoS2filmsurfaces,respectively.(e)(i)ThetopographyofT1T5samples,heightandCPDspectrumscannedalongthelineinAFMfigures.
图3(a)10$\text{μ}\rm{L}$水滴在纯MoS2薄膜和T2基底上的光学图像;(b)F4TCNQ,MoS2和T1—T5的拉曼光谱;(c)F4TCNQ,MoS2和T1—T5的光致发光谱
Fig.3.(a)Opticalimagesof10$\text{μ}\rm{L}$waterdropletonpristineMoS2filmandT2substrate;(b)RamanspectraofF4TCNQ,MoS2andT1T5;(c)PLspectraofF4TCNQ,MoS2andT1T5.
Fig.4.TheRamanspectra(a)of4-MBAmolecules(10–3mol/L)onT1T5substrates;(b)theinterrelationshipbetweenthecorrespondingRamanpeakintensitiesanddifferentgrowthtimesinthepanel(a);(c)therelationshipoftheRamanpeakintensityat1593${\rm{c}\rm{m}}^{-1}$for5groupsof4-MBAmolecules(10–3mol/L)onT1T5substratesandthegrowthtimes;(d)Ramanspectraof4-MBAmoleculesondifferentsubstrates;(e)SERSspectraof4-MBAmoleculesonT2substratewithdifferentconcentrations(10–710–3mol/L);(f)therelationshipbetweentheintensityoftheSERSpeakat1097and1593${\rm{c}\rm{m}}^{-1}$anddifferent4-MBAconcentrations;(g)theschematicofthechargetransfer(CT)pathwaysinF4TCNQ/MoS2nanocompositeheterostructuresandtheCTpathwaysbetweenF4TCNQ/MoS2substrateand4-MBAprobemolecule.
Fig.5.(a)TheRamanspectraofR6Gmolecules(10–9mol/L)onT1T5substrates;(b)theRamanspectraofMBmolecules(10–5mol/L)onT1T5substrates;(c)theinterrelationshipbetweentheRamanpeakintensitiesofR6Gmoleculesandgrowthtimes;(d)theinterrelationshipbetweentheRamanpeakintensitiesofMBmoleculesandgrowthtimes.
表1MoS2和T1—T5样品的水接触角、CPD和相应的费米能级值
Table1.Watercontactangles,CPDvaluesandcorrespondingFermilevelvaluesonMoS2andT1T5substrates.