The platform approach for preparation of molecular adlayers with freestanding functional groups was extended to systems on the basis of the trioxatriangulenium ion. Self-assembled monolayers of these compounds were prepared on Au(111) surfaces and characterized by scanning tunneling microscopy, revealing highly-ordered structures.
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http://dx.doi.org/10.1039/c1cc12598b | DOI Listing |
ACS Nano
January 2025
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China.
Electron transfer is ubiquitous in many chemical reactions and biological phenomena; however, the spatial heterogeneities of electron transfer kinetics in electrocatalysis are so far insufficiently resolved. Measuring and understanding the localized electron transfer are crucial to deciphering the intrinsic activity of electrocatalysts and to achieving further improvements in performance. By using scanning electrochemical probe microscopy to spatially resolve redox electrochemistry across the single-crystalline surface of gold microplates, we discover an intriguing radially distributed electron transfer pattern, where the kinetics around the periphery region are significantly higher than those at the central region, regardless of the redox reaction types.
View Article and Find Full Text PDFNano Lett
December 2024
Key Laboratory for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, School of Materials, Henan University, Kaifeng 475004, China.
The performance of PbSe colloidal quantum dot (CQD) based photodiodes with responses beyond 2000 nm was far from satisfactory and has rarely been reported. The difficulty in obtaining chemically stable large-sized PbSe CQDs was the main reason. In this work, chloride ions in weak acidic solvent were introduced to in-situ etch out the Se atoms on the surfaces of PbSe CQDs and formed a -Pb-Cl protection layer.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), 44919, Ulsan, Republic of Korea.
Chemical vapor deposition of carbon precursors on Cu-based substrates at temperatures exceeding 1000 °C is currently a typical route for the scalable synthesis of large-area high-quality single-layer graphene (SLG) films. Using molecules with higher activities than CH may afford lower growth temperatures that might yield fold- and wrinkle-free graphene. The kinetics of growth of graphene using hydrocarbons other than CH are of interest to the scientific and industrial communities.
View Article and Find Full Text PDFLangmuir
October 2024
Green Processes Research Centre and Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B5E1, Canada.
Kraft lignin (KL) is a sustainable carbon-based substance with a potential use in photovoltaic materials. However, its conductivity is low, but it can be improved via incorporation with a conductive polymer, such as poly(3,4-ethylene dioxythiophene) (PEDOT): poly(styrenesulfonate) (PSS). This study examines the factors affecting the interaction of KL and PEDOT:PSS (PS) in a solution state using a quartz crystal microbalance with dissipation (QCM-D) and a stagnation point refractometer (SPAR).
View Article and Find Full Text PDFJ Am Chem Soc
August 2024
Department of Chemical and Biomolecular Engineering, University of California at Berkeley, Berkeley, California 94720, United States.
The rate of elementary steps on densely-covered surfaces depends sensitively on repulsive interactions within dense adlayers, situations ubiquitous in practice and with kinetic consequences seldom captured by Langmuirian treatments of surface catalysis. This study develops an ensemble-based method that assesses how such repulsion influences the prevalence and kinetic competence of bare-atom ensembles of different size. Chemisorbed CO (CO*) is used as an example because it forms dense adlayers on metal nanoparticles during CO hydrogenation (CO-H) and other reactions, leading to significant repulsion that weakens the binding of CO* and kinetically-relevant transition states (TS).
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