Interactions of Pb and Te atoms with graphene

Abstract

PbTe nanocrystals were deposited onto the surface of graphene and used as a reservoir of Pb and Te atoms. Electron beam irradiation at 80 kV caused Pb and Te atoms to mobilize and disperse across the surface of graphene. We studied the dynamics of these atoms in real time using aberration-corrected transmission electron microscopy. The Pb and Te atoms were found to attach to the surface layer of amorphous carbon that resides upon the graphene, as well as its edge. Pb and Te atoms were not found residing on pristine graphene, but were found to bond to the free edge states along graphene hole edges. Small PbTe nanoclusters tended to only form on the surface of the amorphous carbon regions and not on pristine graphene.

Osmium Atoms and Os2Molecules Move Faster on Selenium-Doped Compared to Sulfur-Doped Boronic Graphenic Surfaces

“…In related work the same group observed the trapping of Mo atoms at defect sites in carbon nanotubes and in graphene, 12 and recently Pb and Te atoms have been trapped on amorphous graphene and at edge sites of holes in graphene. 14 Our experimental data are consistent with these previous observations and also show that such an escape by Os atoms from anchoring sites, at a temperature close to ambient, is dependent on the nature of the graphenic dopants.…”

Recent Progress in Using Graphene as an Ultrathin Transparent Support for Transmission Electron Microscopy

“…They found periodic arrangements of monolayers and bilayers of gold atoms on graphene as they form rectangular atomic structure at temperatures up to 1300 K. Here, graphene served as a transparent substrate to monitor the formation of gold monolayers, in situ heater, and also as a source of carbon which led to the formation of crystalline zinc‐blend structures of gold and carbon compound. Many studies have been conducted on studying the dynamics of single metals on 2D surface and their self‐assembly using graphene as a substrate and in situ heater, such as, translation motion of Fe atoms on graphene, [ 126,127 ] migration of individual Au ad Pt atoms, [ 128 ] nanoclusters formation and motion of individual Pb and Te atoms, [ 129 ] formation of Au nanostructures, [ 130 ] hexagonal close packing of Co on graphene, [ 131 ] and defects and interface of Si nanocrystals. [ 132 ] Some of the structures and dynamics are shown in Figure .…”

Laser-Assisted Fabrication for Metal Halide Perovskite-2D Nanoconjugates: Control on the Nanocrystal Density and Morphology

“…Nanoconjugates consisting of nanocrystals coupled with graphene-based materials have recently attracted the interest of the scientific community for their synergistic properties originating from the coupling of the two different materials [1][2][3][4][5][6][7]. The functional groups (hydroxy, carbonyl, carboxy) on their basal planes or edges of the 2D materials-which make them soluble in multiple solvents, coupled with their low dimensionality-offer attractive properties for applications ranging from photovoltaics to photodetectors and sensors [8][9][10][11].…”

“…The functional groups (hydroxy, carbonyl, carboxy) on their basal planes or edges of the 2D materials-which make them soluble in multiple solvents, coupled with their low dimensionality-offer attractive properties for applications ranging from photovoltaics to photodetectors and sensors [8][9][10][11]. The coupling of these 2D materials with semiconducting quantum dots, mainly synthesized in colloidal solutions, explores the usage of these materials in light-harvesting [12], as catalysts for oxygen reduction in fuel cells [2], electrocatalysts for water splitting [5], as well as in Li-ion batteries [3] derived from the energy and charge transfer, [4,13] or synergetic and enhanced properties [5,14] of the complex structures.…”