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Corrosion of gold by a nanoscale gold and copper belt-like structure

DOI: 10.1021/acs.jpcc.9b04344 DOI Help

Authors: Hidetaka Sawada (Diamond Light Source; University of Oxford; JEOL Ltd) , Konstantin B. Borisenko (University of Oxford) , Masahide Shima (JEOL Ltd) , Konomi Ikita (JEOL Ltd) , Hiroki Hashiguchi (JEOL Ltd) , Ichiro Onishi (JEOL Ltd) , Eiji Okunishi (JEOL Ltd) , Angus I. Kirkland (University of Oxford; Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: July 2019

Abstract: We report the observation of corrosion of gold at the nanoscale, in which nm-sized gold can be corroded in air in the presence of copper at room temperature during ageing to form a compound of gold with residual copper. The compound is a nanoscale belt-like two-dimensional structure that can be prepared from gold nanoparticles. Using high-resolution electron microscopy and chemical analyses, we show that the structure consists of alternating rows of gold and copper atoms. The atomic columns of gold are arranged in rows separated by 0.5 nm and the structure extends in a perpendicular direction to these. DFT calculations of an atomic model of this two-dimensional material consisting of gold, copper, and oxygen suggest that it is a narrow bandgap semiconductor. This belt-like structure, growing around Au fine wire bonding in nano devices, may cause failure in the electric contact in nanodevices. Thus, this study has direct relevance to the use of gold as a contact material in semiconductor devices. In addition, possible future applications as additives in organic solar cells are discussed.

Subject Areas: Chemistry


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