Oxidation of arsenopyrite and deposition of gold on the oxidized surfaces: A scanning probe microscopy, tunneling spectroscopy and XPS study

Investigation of gold nanoparticles immobilized on the surface of pyrite by scanning probe microscopy, scanning tunneling spectroscopy, and X-ray photoelectron spectroscopy

“…The moderate oxidation of the surface accelerates the subsequent gold deposition, whereas the intensive oxidation decelerates this process, as is the case with etching by iron(III) salt solutions. Earlier, we observed the same pattern for arsenopyrite [7] and other sulfides [8]. It is worth noting that, in the case of pyrite, the effect of oxidation is less pronounced.…”

Fabrication of composite thin films with microstructures of honeycomb, foam, and nanosphere arrays through adsorption and self-assembly of block copolymers at the liquid/liquid interface

“…The existence of Au(0) is related to the reduction of Au(III) during the adsorption and assembly process with the small amount of ethanol as a reductant [24]. Compared with the binding energy (BE) of 4f 7/2 of bulk Au(0) [28], the BE of 84.9 eV shifts to high BE region, indicating the formation of small nanoparticles [29,30]. This is in accordance with the TEM observation.…”

Synthesis and assembly of gold nanoparticle-doped polymer solid foam films at the liquid/liquid interface and their catalytic properties

“…The BE of 84.6 eV is larger than the 83.9 eV of bulk Au 0 [46,47], indicating the formation of small nanoparticles and/or surface gold atoms. It has been shown that the BEs of Au 0 increase with decreasing particle size [47][48][49].…”