Δημοσιεύσεις

Project Acronym: NANO2D
Title: NANOparticles-2D-materials
Affiliation: aristotle university of thessaloniki
Pi: Joseph Kioseoglou
Research Field: chemical sciences and materials

In Situ Observation of Metal to Metal Oxide Progression: A Study of Charge Transfer Phenomenon at Ru–CuO Interfaces
by Porkovich, Alexander, Ziadi, Zakaria, Kumar, Pawan, Kioseoglou, Joseph, Jian, Nan, Weng, Lin, Steinhauer, Stephan, Vernieres, Jerome, Grammatikopoulos, Panagiotis and Sowwan, Mukhles
Abstract:
Surface charge and charge transfer between nanoclusters and oxide supports are of paramount importance to catalysis, surface plasmonics, and optical energy harvesting areas. At present, high-energy X-rays and theoretical investigation are always required to determine the chemical state changes in the nanoclusters and the oxide supports, as well as the underlying transfer charge between them. This work presents the idea of using chrono-conductometric measurements to determine the chemical states of the Ru nanoclusters on CuO supports. Both icosahedral and single-crystal hexagonal close-packed Ru nanoclusters were deposited through gas-phase synthesis. To study the charge transfer phenomenon at the interface, a bias was applied to cupric oxide nanowires with metallic nanocluster decoration. In situ conductometric measurements were performed to observe the evolution of Ru into RuOx under heating conditions. Structural elucidation techniques such as transmission electron microscopy, X-ray photoelectron spectroscopy, and Kelvin probe force microscopy were employed to study the corresponding progression of structure, chemical ordering, and surface potential, respectively, as Ru(0) was oxidized to RuOx on the supporting oxide surface. Experimental and theoretical investigation of charge transfer between the nanocluster and oxide support highlighted the importance of metallic character and structure of the nanoclusters on the interfacial charge transfer, thus allowing the investigation of surface charge behavior on oxide-supported catalysts, in situ, during catalytic operation via conductometric measurements.
Reference:
In Situ Observation of Metal to Metal Oxide Progression: A Study of Charge Transfer Phenomenon at Ru–CuO Interfaces (Porkovich, Alexander, Ziadi, Zakaria, Kumar, Pawan, Kioseoglou, Joseph, Jian, Nan, Weng, Lin, Steinhauer, Stephan, Vernieres, Jerome, Grammatikopoulos, Panagiotis and Sowwan, Mukhles), In ACS Nano, 2019.
Bibtex Entry:
@article{doi:10.1021-acsnano.9b06224,
 author = {Porkovich, Alexander and Ziadi, Zakaria and Kumar, Pawan and Kioseoglou, Joseph and Jian, Nan and Weng, Lin and Steinhauer, Stephan and Vernieres, Jerome and Grammatikopoulos, Panagiotis and Sowwan, Mukhles},
 title = {In Situ Observation of Metal to Metal Oxide Progression: A Study of Charge Transfer Phenomenon at Ru–CuO Interfaces},
 journal = {ACS Nano},
 year = {2019},
 bibyear = {2019},
 doi = {10.1021/acsnano.9b06224},
 note = {PMID: 31577415},
 url = {https://doi.org/10.1021/acsnano.9b06224},
 eprint = { https://doi.org/10.1021/acsnano.9b06224},
 abstract = { Surface charge and charge transfer between nanoclusters and oxide supports are of paramount importance to catalysis, surface plasmonics, and optical energy harvesting areas. At present, high-energy X-rays and theoretical investigation are always required to determine the chemical state changes in the nanoclusters and the oxide supports, as well as the underlying transfer charge between them. This work presents the idea of using chrono-conductometric measurements to determine the chemical states of the Ru nanoclusters on CuO supports. Both icosahedral and single-crystal hexagonal close-packed Ru nanoclusters were deposited through gas-phase synthesis. To study the charge transfer phenomenon at the interface, a bias was applied to cupric oxide nanowires with metallic nanocluster decoration. In situ conductometric measurements were performed to observe the evolution of Ru into RuOx under heating conditions. Structural elucidation techniques such as transmission electron microscopy, X-ray photoelectron spectroscopy, and Kelvin probe force microscopy were employed to study the corresponding progression of structure, chemical ordering, and surface potential, respectively, as Ru(0) was oxidized to RuOx on the supporting oxide surface. Experimental and theoretical investigation of charge transfer between the nanocluster and oxide support highlighted the importance of metallic character and structure of the nanoclusters on the interfacial charge transfer, thus allowing the investigation of surface charge behavior on oxide-supported catalysts, in situ, during catalytic operation via conductometric measurements. },
}