Confined in a molecular corral: A supramolecular network changes the mechanism by which underpotential deposition (UPD) of copper proceeds on a gold electrode modified by a self-assembled monolayer (SAM). Lateral diffusion of Cu adatoms is suppressed between adjacent cells of a network/SAM hybrid structure. Instead, UPD occurs by direct deposition into the SAM filled pores of the network, where the Cu adatoms are confined.
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http://dx.doi.org/10.1002/anie.200806267 | DOI Listing |
Phys Chem Chem Phys
October 2024
Instituto de Investigaciones en Catálisis y Petroquímica "Ingeniero José M. Parera" (INCAPE), Facultad de Ingeniería Química, Universidad Nacional del Litoral - CONICET, Centro Científico Tecnológico CONICET Santa Fe (CCT-SF), Santa Fe, Argentina.
In this work, supported Pt monometallic catalysts were prepared using oxide and carbon supports by conventional impregnation methods. Similar Pt metallic nanoparticle sizes (mean sizes about 1.8-2 nm) have been obtained using different Pt precursor loadings (0.
View Article and Find Full Text PDFJ Am Chem Soc
October 2024
School of Materials Science and Engineering, Peking University, Beijing 100871, China.
ACS Nano
October 2024
Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid 28049, Spain.
Understanding how carbon dioxide (CO) behaves and interacts with surfaces is paramount for the development of sensors and materials to attempt CO mitigation and catalysis. Here, we combine simultaneous atomic force microscopy (AFM) and scanning tunneling microscopy (STM) using CO-functionalized probes with density functional theory (DFT)-based simulations to gain fundamental insight into the behavior of physisorbed CO molecules on a gold(111) surface that also contains one-dimensional metal-organic chains formed by 1,4-phenylene diisocyanide (PDI) bridged by gold (Au) adatoms. We resolve the structure of self-assembled CO islands, both confined between the PDI-Au chains as well as free-standing on the surface and reveal a chiral arrangement of CO molecules in a windmill-like structure that encloses a standing-up CO molecule and other foreign species existing at the surface.
View Article and Find Full Text PDFACS Nano
August 2024
Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang 37673, Republic of Korea.
Adsorption of alkali atoms onto material surfaces is widely utilized for controlling electronic properties and is particularly effective for two-dimensional materials. While tuning the chemical potential and band gap and creating quantum-confined states are well established for alkali adsorption on semiconductors, the effects on semimetallic systems remain largely elusive. Here, utilizing angle-resolved photoemission spectroscopy measurements and density functional theory calculations, we disclose the creation of two-dimensional electron gas and the quantum-confined Lifshitz transition at the surface of a Weyl semimetal -MoTe by potassium adsorption.
View Article and Find Full Text PDFChemphyschem
August 2024
Department of Materials Science, University of Milan-Bicocca, Via Roberto Cozzi 55, 20125, Milan, Italy.
Hybrid DFT calculations are employed to compare the adsorption and stabilization of Cu, Ag, and Au atoms on graphitic CN and on the heterojunction formed by g- CN and TiO. While Cu and Ag can be strongly chemisorbed in form of cations on g- CN, Au is only weakly physisorbed. On g- CN/TiO, all coinage metal adatoms can be strongly chemisorbed, but, while Cu and Ag forms cations, Au form an Au species.
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