Article
Nanoscience & Nanotechnology
Alexey Prosvetov, Alexey V. Verkhovtsev, Gennady Sushko, Andrey Solov'yov
Summary: This paper presents a detailed computational protocol for atomistic simulation of the formation and growth of metal-containing nanostructures during FEBID, providing valuable insights into the fundamental mechanisms of electron-induced precursor fragmentation and nanostructure formation. The developed methodology is general and can be adjusted for different precursor molecules and nanofabrication techniques. Simulation results offer valuable reference data for experimental characterization of nanostructures grown by FEBID.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Shuai Hao, Bin Li, Zhanyuan Liu, Wenlong Huang, Dongmei Jiang, Liangshu Xia
Summary: Large quantities of solutions containing oxalic acid and nitric acid are produced from nuclear fuel reprocessing. Pt/SiO2 catalyst can successfully degrade oxalic acid in nitric acid solutions, allowing recovery of nitric acid and plutonium ions. This method, which is a preferred alternative to the current KMnO4 reaction, lacks theoretical support, so this study aims to clarify the reaction mechanism.
Article
Multidisciplinary Sciences
Ruben Rizo, Julia Fernandez-Vidal, Laurence J. Hardwick, Gary A. Attard, Francisco J. Vidal-Iglesias, Victor Climent, Enrique Herrero, Juan M. Feliu
Summary: The adsorption of OH species plays a crucial role in many electrochemical reactions. This study demonstrates that OH can be adsorbed at more negative potentials on low coordinated Pt atoms. This finding opens up new possibilities for the mechanistic study of electrochemical reactions.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Yingzhen Chen, Christian Rodenbuecher, Klaus Wippermann, Carsten Korte
Summary: In this study, the electrochemical behavior of platinum electrodes in protic ionic liquids (PILs) was investigated using in situ Fourier-transform infrared spectroscopy coupled with cyclic voltammetry. The results provided direct evidence of the change of water at the Pt electrode surface due to Pt oxide formation and reduction. It was also found that anion adsorption could block catalytic sites and reducing it could enhance the ORR activity.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Rodrigo Antunes, Roland Steiner, Laurent Marot, Ernst Meyer
Summary: This study investigates the decomposition of pure NH3 and ND3 using Pt/Al2O3 and Ru/Al2O3 catalysts on alumina. The results show that the decomposition with Ru/Al2O3 has higher efficiency and weaker inhibition effect.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Nanoscience & Nanotechnology
Kensaku Kodama, Tomoyuki Nagai, Akira Kuwaki, Ryosuke Jinnouchi, Yu Morimoto
Summary: Progress has been made in the development of Pt-based nanocatalysts for the oxygen reduction reaction over the past 30 years, with some now in commercial production for PEFCs. However, further improvements in catalytic activity are needed. State-of-the-art catalysts have potential to enhance energy conversion efficiencies and reduce platinum usage in PEFCs, but technical challenges remain for their application in fuel cell vehicles, such as high power density, practical durability, and efficiency.
NATURE NANOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Hongsen Wang, Hector D. Abrun
Summary: This study investigated the electrooxidation process of ethanol on platinum electrodes using spectroscopy and isotopic labeling. It was discovered that the intermediate species produced during ethanol oxidation can degrade the surface of the platinum electrode, reducing its performance. These new mechanistic insights will facilitate the design of higher-performing and more durable electrocatalysts for direct ethanol fuel cells.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Bryan J. Hare, Ricardo A. Garcia Carcamo, Tianjun Xie, Paul J. Meza-Morales, Rachel B. Getman, Carsten Sievers
Summary: Dehydrogenation is the first step in the aqueous phase reforming mechanism of polyols, and this study investigates the reaction of methanol on Pt/gamma-Al2O3 catalysts using infrared spectroscopy. The results show that highly coordinated Pt metal sites are more active for methanol dehydrogenation, with larger Pt particles producing more CO at lower temperatures. Additionally, the co-adsorption of water does not affect methanol dehydrogenation on large Pt particles, but hinders the reaction on small Pt particles.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Kecheng Wei, Honghong Lin, Xueru Zhao, Zhonglong Zhao, Nebojsa Marinkovic, Michael Morales, Zhennan Huang, Laura Perlmutter, Huanqin Guan, Cooro Harris, Miaofang Chi, Gang Lu, Kotaro Sasaki, Shouheng Sun
Summary: Efficient cleavage of C-C bonds and oxidation of alcohols to CO2 is crucial for the development of highly efficient alcohol fuel cells. In this work, core/shell Au/Pt nanowires with stepped Pt clusters deposited on ultra-thin Au nanowires are synthesized as an active catalyst for alcohol oxidation. The Au-1.0/Pt-0.2 nanowires show the highest activity for ethanol electro-oxidation and also exhibit activity for other primary alcohols. The study provides important evidence and insights for enhancing electrochemical oxidation of alcohols and future development of direct alcohol fuel cells.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Yu-Rim Hong, Soumen Dutta, Sun Woo Jang, Odongo Francis Ngome Okello, Hyeonae Im, Si-Young Choi, Jeong Woo Han, In Su Lee
Summary: This study addresses the inefficient interfacial contact effect in Pt-catalyzed alkaline hydrogen evolution reaction (HER) by producing atomically flat two-dimensional Pt nanodendrites (2D-PtNDs) and realizing a maximized and firmly bound lateral heterointerface with NiFe-layered double hydroxide (LDH). This work demonstrates the importance of shape and facet of Pt in creating heterointerfaces that provide catalytic synergy for efficient hydrogen production.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Shengwei Yu, Liyuan Chen, Na Cheng, Jiyuan Lu, Liyuan Bi, Wenhui Zhang, Aiping Chen, Haibo Jiang, Chunzhong Li
Summary: Researchers synthesized Pt1.2Ni/C catalyst with excellent activity and long-term stability for oxygen reduction reaction (ORR), achieving a mass activity of 1.53 A/mgPt, which is 12 times higher than that of commercial Pt/C. The adsorption of abundant water on the Pt1.2Ni alloy surface weakens the adsorption of oxygen, contributing to the ORR performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Arik Beck, Hannes Frey, Xing Huang, Adam H. Clark, Emmett D. Goodman, Matteo Cargnello, Marc Willinger, Jeroen A. van Bokhoven
Summary: Platinum nanoparticles supported by titania can form overlayer due to strong metal-support interaction, which can enhance the catalyst's properties and prevent sintering. The overlayer can be reversed through oxidative treatments, but recent findings suggest its stability in oxygen. In our study, we used in situ transmission electron microscopy to investigate the changes in the overlayer under different conditions and found that high temperature and oxygen atmosphere preserved the overlayer, preventing platinum evaporation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Zainab Almansaf, Jiyun Hu, Federica Zanca, Hamid R. Shahsavari, Benjamin Kampmeyer, Miu Tsuji, Kartik Maity, Valerie Lomonte, Yumi Ha, Piero Mastrorilli, Stefano Todisco, Mourad Benamara, Rama Oktavian, Arsalan Mirjafari, Peyman Z. Moghadam, Ahmad R. Khosropour, Hudson Beyzavi
Summary: A new COF based on imine bonds with dual-pore structure and high crystallinity was successfully synthesized, and selectively metallated with Pt on the N donor in the larger pores. The metallated COF showed excellent performance as a recyclable heterogeneous photocatalyst for decarboxylative difluoroalkylation and oxidative cyclization reactions.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Biotechnology & Applied Microbiology
Behrouz Bozorgi, Javad Karimi-Sabet, Parisa Khadiv-Parsi
Summary: Using promoters to improve catalytic activity is an efficient method in chemical and industrial applications. This paper comprehensively examines the effects of impregnation method and alkali metals on the decomposition of N2O using a series of 1%wt Pt-M/SiO2 (M=Na, K, and Cs) catalysts. The catalysts were characterized using various techniques to analyze their physical and chemical properties and their relationship with catalytic activity. The results show that sodium and cesium reduce the conversion rate, while potassium exhibits promotional characteristics. Electron donation, facilitation of oxygen surface diffusion, and uniform distribution of KOx clusters are significant factors in improving the catalyst's reactivity.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Chemistry, Multidisciplinary
Hongsen Wang, Hector D. Abruna
Summary: In this study, the OH stretching band of OH adspecies on Pt, Ru, and Pt/Ru electrodes was identified for the first time using surface-enhanced infrared absorption spectroscopy (SEIRAS) in a flow cell through potential modulation and CO displacement. The results showed that Ru had a relatively constant OH coverage at potentials between 0.1 and 0.8 V, while Pt had a maximum OH coverage at 0.6 V in 0.1 M HClO4 and 0.7 V in 0.1 M KOH. CO oxidation kinetics on Ru were found to be sluggish, but adsorbed OH appeared on Ru at very low potentials. Binary Pt/Ru electrodes promoted CO oxidation through a synergistic effect where Ru promoted OH adsorption and Pt catalyzed the reaction between the CO and OH adspecies. Water coadsorbed with CO at Ru sites of Pt/Ru also played an important role. These new spectroscopic results on OH adspecies could advance the understanding of the mechanism of fuel cell related electrocatalysis.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Correction
Optics
Fabian Schmidt, Martin Philipp Mues, Jan Hendrik Bredehoeft, Petra Swiderek
Summary: A correction to the paper has been published.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Chemistry, Physical
Agnieszka Priebe, Bryan Dousse, Chia-Yu Tzou, Georgios Papadopoulos, Ivo Utke, Abdelhak Bensaoula, Johann Michler, Carlos Guerra-Nunez
Summary: This article presents the potential of integrating a time-of-flight mass spectrometer (TOFMS) with atomic layer deposition (ALD) for real-time control of thin-film fabrication processes. The technique allows for parallel detection and in situ chemical data acquisition, enabling immediate modifications to the deposition parameters.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Instruments & Instrumentation
A. M. M. G. Theulings, S. X. Tao, C. W. Hagen, H. van der Graaf
Summary: The impact of doping in Si3N4 membranes on secondary electron yield was investigated through Monte Carlo simulations. Increasing doping concentration results in a decrease in maximum secondary electron yield, which can be minimized by optimizing the distribution of doped silicon atoms.
JOURNAL OF INSTRUMENTATION
(2022)
Article
Chemistry, Multidisciplinary
Petra Martinovic, Markus Rohdenburg, Aleksandra Butrymowicz, Selma Sarigul, Paula Huth, Reinhard Denecke, Iwona B. Szymanska, Petra Swiderek
Summary: The study demonstrates that the performance of different Ag(I) complexes in FEBID critically depends on their molecular structure, with Ag(I) carboxylates containing aliphatic side chains being particularly favorable for FEBID.
Article
Chemistry, Multidisciplinary
Jakub Jurczyk, Lex Pillatsch, Luisa Berger, Agnieszka Priebe, Katarzyna Madajska, Czeslaw Kapusta, Iwona B. Szymanska, Johann Michler, Ivo Utke
Summary: This study developed a method called focused-electron-beam-induced mass spectrometry (FEBiMS) for analyzing the fragmentation products of metalorganic compounds under electron irradiation. The results showed that FEBiMS is capable of investigating the fragmentation process of electron-sensitive materials within the energy range of scanning electron microscopes and has potential applications in studying fundamental and process parameters in various nanotechnology fields.
Article
Materials Science, Multidisciplinary
Thomas Edward James Edwards, Tianle Xie, Nicolo Maria della Ventura, Daniele Casari, Carlos Guerra, Emese Huszar, Xavier Maeder, Johann Jakob Schwiedrzik, Ivo Utke, Laszlo Petho, Johann Michler
Summary: Physical vapour deposition combined with atomic layer deposition was used to design a model system of ultrafine-grained aluminum with a narrow grain size distribution. The study investigated the strengthening mechanisms of ultrathin oxide layers in a metal multilayer structure. Experimental results showed that the strengthening effect of the oxide layer was effective even at a thickness of 0.5 nm.
Article
Instruments & Instrumentation
H. W. Chan, V Prodanovic, A. M. M. G. Theulings, T. ten Bruggencate, C. W. Hagen, P. M. Sarro, H. v d Graaf
Summary: In this study, large-area transmission dynodes were fabricated using an ultra-thin continuous film and a corrugated membrane to improve mechanical properties. The ultra-thin film was deposited with atomic layer deposition and consisted of three layers. The experimental results showed that the corrugated membrane with an octagonal pattern achieved the highest transmission electron yield.
JOURNAL OF INSTRUMENTATION
(2022)
Article
Materials Science, Coatings & Films
Jeffrey M. Woodward, Samantha G. Rosenberg, David R. Boris, Michael J. Johnson, Scott G. Walton, Scooter D. Johnson, Zachary R. Robinson, Neeraj Nepal, Karl F. Ludwig Jr, Jennifer K. Hite, Charles R. Eddy Jr
Summary: Plasma-enhanced atomic layer deposition (PEALD) enables the epitaxial growth of ultrathin indium nitride (InN) films with reduced process temperatures and better control of layer thickness. The relationship between plasma properties and growth kinetics is crucial for optimizing growth parameters. In this study, in situ investigation using grazing incidence small-angle x-ray scattering (GISAXS) reveals that the production of nitrogen species in the plasma influences the growth mode, with high concentrations promoting island growth and low concentrations promoting layer-plus-island growth. The results demonstrate the potential to control the growth kinetics of epitaxial films during PEALD by manipulating specific plasma species generation regimes.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Multidisciplinary Sciences
Sangeetha Hari, Johan A. Slotman, Yoram Vos, Christian Floris, Wiggert A. van Cappellen, C. W. Hagen, Sjoerd Stallinga, Adriaan B. Houtsmuller, Jacob P. Hoogenboom
Summary: This study presents a method for direct electron-beam patterning of fluorescence nanopatterns as calibration standards for super-resolution fluorescence. By using electron microscopy and fluorescence labeling, the dimensions of predefined patterns can be accurately measured, allowing for correlation between electron images and reconstructed super-resolution images.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Hannah Boeckers, Petra Swiderek, Markus Rohdenburg
Summary: Focused Electron Beam Induced Deposition (FEBID) is a tool for producing nanoscale materials, which can be used for humidity or strain sensors. Through post-deposition electron irradiation in the presence of ammonia (NH3), the interaction between the deposits and water can be enhanced, enabling the improvement and tuning of humidity sensors fabricated by FEBID.
Article
Materials Science, Coatings & Films
Petra Martinovic, Lars Barnewitz, Markus Rohdenburg, Petra Swiderek
Summary: Focused electron beam induced deposition (FEBID) is a direct-write method used to produce nanostructures from organometallic precursor molecules. This study aims to suppress thermal chemistry and re-enable it within an area defined by the electron beam. The results show that co-injection of NH3 during FEBID could be a viable strategy to enhance the spatial control of the deposition process.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Chemistry, Multidisciplinary
Jakub Jurczyk, Katja Hoeflich, Katarzyna Madajska, Luisa Berger, Leo Brockhuis, Thomas Edward James Edwards, Czeslaw Kapusta, Iwona B. Szymanska, Ivo Utke
Summary: Gas-assisted focused electron-beam-induced deposition is a versatile tool for direct writing of complex-shaped nanostructures with unprecedented shape fidelity and resolution. The direct electron beam writing of silver is still in its early stage of development, and the potential precursors for focused electron-beam-induced deposition of silver are examined and compared in this study.
Article
Nanoscience & Nanotechnology
Simeon J. Gilbert, Melissa L. Meyerson, Paul G. Kotula, Samantha G. Rosenberg, Thomas G. Kmieciak, Michael P. McGarry, Michael P. Siegal, Laura B. Biedermann
Summary: Understanding and controlling nanoscale interface phenomena is crucial for optimizing electronic devices. In this study, we demonstrate that granular metals (GMs) can be used to evaluate the role of secondary phases at interfaces. We investigated SiN (x) as an alternative insulator for GMs and found that Mo-SiN (x) had reduced metal-silicide formation and lower conductivity. XPS measurements indicate that metal-silicide and metal-nitride formation can be controlled in Mo-SiN (x). SiN (x) also provides a pathway to metal-nitride nanostructures for various applications.
Proceedings Paper
Engineering, Electrical & Electronic
Neda Hesam Mahmoudi Nezhad, Mohamad Ghaffarian Niasar, Cornelis W. Hagen, Pieter Kruit
Summary: The design of electrostatic electron lenses involves the selection of geometrical parameters for the electrodes and applied voltages. The purpose is to focus electrons and minimize lens aberrations. Genetic algorithm optimization and analytical approximations are used to improve the design. The analysis shows that a lower population size with more generations can achieve better results, and the combination of Crossover Heuristic with Mutation Gaussian performs the best.
2023 IEEE MTT-S INTERNATIONAL CONFERENCE ON NUMERICAL ELECTROMAGNETIC AND MULTIPHYSICS MODELING AND OPTIMIZATION, NEMO
(2023)
Article
Physics, Atomic, Molecular & Chemical
Fabian Schmidt, Tobias Borrmann, Martin Philipp Mues, Sanna Benter, Petra Swiderek, Jan Hendrik Bredehoeft
Summary: Electron-induced chemistry is relevant to various processes involving ionizing radiation, such as radiation damage, polymer curing, and nanofabrication. It triggers reactions and leads to the formation of larger products. Although the initial interaction is non-thermal, the subsequent reactions follow familiar thermal and radical-driven mechanisms of organic chemistry, influencing the formation of products.