Abstract
Graphene nanosheets were prepared using a modified Hummer's method, and Au-graphene nanocomposites were fabricated by in situ reduction of a gold salt. The as-produced graphene was characterized by X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, scanning electron microscopy, and high-resolution transmission electron microscopy (HR-TEM). In particular, the HR-TEM demonstrated the layered crystallites of graphene with fringe spacing of about 0.32 nm in individual sheets and the ultrafine facetted structure of about 20 to 50 nm of Au particles in graphene composite. Scanning helium ion microscopy (HIM) technique was employed to demonstrate direct write deposition on graphene by lettering with gaps down to 7 nm within the chamber of the microscope. Bare graphene and graphene-gold nanocomposites were further characterized in terms of their composition and optical and electrical properties.
Highlights
Graphene, structurally known as a monatomic layer of allotropic-carbon atoms in a hexagonal honeycomb twodimensional lattice system, has always been a potential candidate for various applications due to its remarkable structural, physical, and electronic properties [1,2,3,4,5,6,7,8,9]
UV-Vis spectral response The successful synthesis of graphene and Au nanoparticles decorated graphene was confirmed by ultravioletvisible (UV-Vis) spectroscopy (Figure 1)
When Au nanoparticles were decorated onto the graphene, a broad peak in the visible range was observed corresponding to the surface plasmon absorption of Au nanoparticles
Summary
Structurally known as a monatomic layer of allotropic-carbon atoms in a hexagonal honeycomb twodimensional lattice system, has always been a potential candidate for various applications due to its remarkable structural, physical, and electronic properties [1,2,3,4,5,6,7,8,9]. The demonstration of imaging by helium (He) ions is relatively a new technique to characterize the surfaces at sub-nanoscale with extraordinary additional advantages of in situ ion lithography, nano-patterning, device prototyping, fabrication of quantum dots, beam-induced chemistry, and milling at nanoscale [15,16]. Such a diverse usage is possible due to the light mass of the He ion and high speed, which results in smaller interaction volume with the surface layers and in better resolution and potential milling feature size. The He ion capability of the microscope was used to perform the experiments of nanoscale patterning on the surfaces of graphene
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