INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
CVD Graphene Transferred with Au Nanoparticles: An Ideal Platform for TERS and SERS on a Single Triangular Nanoplate
Autor/es:
MARÍA C. DALFOVO; GABRIELA I. LACCONI; LUIS A. PÉREZ; ANALÍA L. SOLDATI; HORACIO TROIANI; FRANCISCO J. IBAÑEZ
Revista:
JOURNAL OF PHYSICAL CHEMISTRY C
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2016 vol. 120 p. 8315 - 8322
ISSN:
1932-7447
Resumen:
Transferring CVD graphene using surfactantprotectedAu nanoparticles (Au NPs) avoids the use of PMMAand opens new ways of building heterojunctions for TERS andSERS applications. Thermal treatment removes organics fromthe Au NPs and leads to larger nanoparticles and theformation of networks, dimmers, and nanoplates of variousshapes (circles, hexagons, and triangles). Raman and HRTEMrevealed bilayer graphene and Moirépatterns as determined bythe 2D band and dislocated atomic layers, respectively. TERS performed on the heterojunction exhibits a reversible increase infrequency and sharpening of the characteristic bands in graphene along with the exaltation of bands such as D + D′. A closeexamination into a single triangular-shape nanoplate reveals that the most irregular area of the nanoplate is consistent with thehigher Raman enhancement of Rh6G when compared to other areas of the same feature. This work may shed light onto newways of transferring graphene, fundamental aspects concerning local strains in the heterojunction, and SERS on a single Aunanostructure.