NDLI: Effect of CO Molecule Orientation on the Reduction of Cu-Based Nanoparticles

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Effect of CO Molecule Orientation on the Reduction of Cu-Based Nanoparticles

Content Provider	MDPI
Author	Sarvadii, Sergey Gatin, Andrey Kharitonov, Vasiliy Dokhlikova, Nadezhda Ozerin, Sergey Grishin, Maxim Shub, Boris
Copyright Year	2021
Description	The adsorption of CO on the surface of Cu-based nanoparticles was studied in the presence of an external electric field by means of scanning tunneling microscopy (STM) and spectroscopy (STS). Nanoparticles were synthesized on the surface of a graphite support by the impregnation–precipitation method. The chemical composition of the surface of the nanoparticles was determined as a mixture of Cu2O, Cu4O3 and CuO oxides. CO was adsorbed from the gas phase onto the surface of the nanoparticles. During the adsorption process, the potential differences ΔV = +1 or −1 V were applied to the vacuum gap between the sample and the grounded tip. Thus, the system of the STM tip and sample surface formed an asymmetric capacitor, inside which an inhomogeneous electric field existed. The CO adsorption process is accompanied by the partial reduction of nanoparticles. Due to the orientation of the CO molecule in the electric field, the reduction was weak in the case of a positive potential difference, while in the case of a negative potential difference, the reduction rate increased significantly. The ability to control the adsorption process of CO by means of an external electric field was demonstrated. The size of the nanoparticle was shown to be the key factor affecting the adsorption process, and particularly, the strength of the local electric field close to the nanoparticle surface.
Starting Page	279
e-ISSN	20794991
DOI	10.3390/nano11020279
Journal	Nanomaterials
Issue Number	2
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-01-22
Access Restriction	Open
Subject Keyword	Nanomaterials Atomic, Molecular and Chemical Physics Copper Oxides Co Adsorption Reduction Electric Field Scanning Tunneling Microscopy Scanning Tunneling Spectroscopy
Content Type	Text
Resource Type	Article

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