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Nallakumar S, Muthurakku UR. Chemically sprayed pristine and Cd 2+ incorporated Co 2SnO 4 thin films for low ppm level enhanced chemi - resistive behaviour towards dimethylamine detection at room temperature. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:134041. [PMID: 38522203 DOI: 10.1016/j.jhazmat.2024.134041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 03/11/2024] [Accepted: 03/13/2024] [Indexed: 03/26/2024]
Abstract
The surge in hazardous volatile organic liquid emissions driven by the rapid growth of the manufacturing industry has compelled a rising demand for gas sensors, which exhibit remarkable sensitivity, selectivity, and room temperature operation. Ternary metal oxide spinel has indeed garnered significant attention in chemi-resistive gas sensors due to their large reactive surface area, physicochemical, and other unique properties. In this work, we have studied chemically sprayed pristine and Cd 2+ incorporated Co2SnO4 thin film as a sensing layer under room temperature (300 K) conditions. The 5 wt% Cd 2+ incorporated Co2SnO4 films unveiled a high sensor response to dimethylamine (DMA) gas (S = Igas/Iair = 6153 at 1 ppm), which was boosted by 8.89-fold times compared to pristine Co2SnO4 film, due to the large reactive surface area and enhanced defective oxygen vacancies. It has superior selectivity towards DMA gas, good response time (154 s) / recovery time (90 s), superior pro-longevity (S = 6138) after 60 days, stable repeatability (7 cycles), excellent cross-selectivity, and relative humid resistance at 300 K. This research work provides insights on Cd 2+ incorporated Co2SnO4 thin films and their feasibility in real-time gas sensing devices.
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Affiliation(s)
- Santhosh Nallakumar
- Department of Physics, School of Advanced Sciences, VIT, Vellore 632014, India
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2
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Pożarowska E, Pleines L, Ewert M, Prieto MJ, Tănase LC, Caldas LDS, Tiwari A, Schmidt T, Falta J, Krasovskii E, Morales C, Flege JI. Preparation and stability of the hexagonal phase of samarium oxide on Ru(0001). Ultramicroscopy 2023; 250:113755. [PMID: 37216832 DOI: 10.1016/j.ultramic.2023.113755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 04/15/2023] [Accepted: 05/08/2023] [Indexed: 05/24/2023]
Abstract
We have used low-energy electron microscopy (LEEM), micro-illumination low-energy electron diffraction (µLEED) supported by ab initio calculations, and X-ray absorption spectroscopy (XAS) to investigate in-situ and in real-time the structural properties of Sm2O3 deposits grown on Ru(0001), a rare-earth metal oxide model catalyst. Our results show that samarium oxide grows in a hexagonal A-Sm2O3 phase on Ru(0001), exhibiting a (0001) oriented-top facet and (113) side facets. Upon annealing, a structural transition from the hexagonal to cubic phase occurs, in which the Sm cations exhibit the +3 oxidation state. The unexpected initial growth in the A-Sm2O3 hexagonal phase and its gradual transition to a mixture with cubic C-Sm2O3 showcases the complexity of the system and the critical role of the substrate in the stabilization of the hexagonal phase, which was previously reported only at high pressures and temperatures for bulk samaria. Besides, these results highlight the potential interactions that Sm could have with other catalytic compounds with respect to the here gathered insights on the preparation conditions and the specific compounds with which it interacts.
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Affiliation(s)
- Emilia Pożarowska
- Applied Physics and Semiconductor Spectroscopy, Brandenburg University of Technology Cottbus-Senftenberg, 03046 Cottbus, Germany
| | - Linus Pleines
- Institute of Solid State Physics, University of Bremen, 28359 Bremen, Germany
| | - Moritz Ewert
- Applied Physics and Semiconductor Spectroscopy, Brandenburg University of Technology Cottbus-Senftenberg, 03046 Cottbus, Germany
| | - Mauricio J Prieto
- Department of Interface Science, Fritz-Haber Institute, 14195 Berlin, Germany
| | - Liviu C Tănase
- Department of Interface Science, Fritz-Haber Institute, 14195 Berlin, Germany
| | | | - Aarti Tiwari
- Department of Interface Science, Fritz-Haber Institute, 14195 Berlin, Germany
| | - Thomas Schmidt
- Department of Interface Science, Fritz-Haber Institute, 14195 Berlin, Germany
| | - Jens Falta
- Institute of Solid State Physics, University of Bremen, 28359 Bremen, Germany
| | - Eugene Krasovskii
- Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Universidad del Pais Vasco UPV/EHU, 20080 San Sebastián/Donostia, Spain; IKERBASQUE, Basque Foundation for Science, E-48013 Bilbao, Spain; Donostia International Physics Center (DIPC), E-20018 San Sebastián, Spain
| | - Carlos Morales
- Applied Physics and Semiconductor Spectroscopy, Brandenburg University of Technology Cottbus-Senftenberg, 03046 Cottbus, Germany
| | - Jan Ingo Flege
- Applied Physics and Semiconductor Spectroscopy, Brandenburg University of Technology Cottbus-Senftenberg, 03046 Cottbus, Germany.
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Chen B, Du Z, Su Z, Ma M, Tang C. MACDiffusion Behavior of Water Molecules in Binary Mixed Vegetable Oils under the Synergistic Effect of Temperature and Nano-TiO2. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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4
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Chen B, Su Z, Du Z, Ma M, Zhang J, Tang C. A new type of mixed vegetable insulating oil with better kinematic viscosity and oxidation stability. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119512] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Zhao W, Shi J, Lin M, Sun L, Su H, Sun X, Murayama T, Qi C. Praseodymia–titania mixed oxide supported gold as efficient water gas shift catalyst: modulated by the mixing ratio of oxides. RSC Adv 2022; 12:5374-5385. [PMID: 35425532 PMCID: PMC8981221 DOI: 10.1039/d1ra08572g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 02/01/2022] [Indexed: 11/21/2022] Open
Abstract
Modulating the active sites for controllable tuning of the catalytic activity has been the goal of much research, however, this remains challenging. The O vacancy is well known as an active site in reducible oxides. To modify the activity of O vacancies in praseodymia, we synthesized a series of praseodymia–titania mixed oxides. Varying the Pr : Ti mole ratio (2 : 1, 1 : 2, 1 : 1, 1 : 4) allows us to control the electronic interactions between Au, Pr and Ti cations and the local chemical environment of the O vacancies. These effects have been studied study by X-ray photoelectron spectroscopy (XPS), CO diffuse reflectance Fourier transform infrared spectroscopy (CO-DRIFTS) and temperature-programmed reduction (CO-TPR, H2-TPR). The water gas shift reaction (WGSR) was used as a benchmark reaction to test the catalytic performance of different praseodymia–titania supported Au. Among them, Au/Pr1Ti2Ox was identified to exhibit the highest activity, with a CO conversion of 75% at 300 °C, which is about 3.7 times that of Au/TiO2 and Au/PrOx. The Au/Pr1Ti2Ox also exhibited excellent stability, with the conversion after 40 h time-on-stream at 300 °C still being 67%. An optimal ratio of Pr content (Pr : Ti 1 : 2) is necessary for improving the surface oxygen mobility and oxygen exchange capability, a higher Pr content leads to more O vacancies, however with lower activity. This study presents a new route for modulating the active defect sites in mixed oxides which could also be extended to other heterogeneous catalysis systems. Schematic illustration of H2O activation on the Pr-TiOx support and the following reaction with CO in the Au–oxide interface.![]()
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Affiliation(s)
- Weixuan Zhao
- Shandong Applied Research Centre of Gold Nanotechnology, School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
| | - Junjie Shi
- Shandong Applied Research Centre of Gold Nanotechnology, School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - Mingyue Lin
- Shanghai Environmental Protection Key Laboratory on Environmental Standard and Risk Management of Chemical Pollutants, East China University of Science and Technology, Shanghai 200237, China
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China
| | - Libo Sun
- Shandong Applied Research Centre of Gold Nanotechnology, School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
| | - Huijuan Su
- Shandong Applied Research Centre of Gold Nanotechnology, School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
| | - Xun Sun
- Shandong Applied Research Centre of Gold Nanotechnology, School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
| | - Toru Murayama
- Shandong Applied Research Centre of Gold Nanotechnology, School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
- Research Center for Gold Chemistry, Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 192-0397 Tokyo, Japan
- Research Center for Hydrogen Energy-based Society, Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Caixia Qi
- Shandong Applied Research Centre of Gold Nanotechnology, School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
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El Barraj A, Chatelain B, Barth C. High-temperature oxidation and reduction of the inverse ceria/Cu(111) catalyst characterized by LEED, STM, nc-AFM and KPFM. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 34:014001. [PMID: 34525469 DOI: 10.1088/1361-648x/ac26f9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
The inverse catalyst 'cerium oxide (ceria) on copper' has attracted much interest in recent time because of its promising catalytic activity in the water-gas-shift reaction and the hydrogenation of CO2. For such reactions it is important to study the redox behaviour of this system, in particular with respect to the reduction by H2. Here, we investigate the high-temperature O2oxidation and H2reduction of ceria nanoparticles (NPs) and a Cu(111) support by low energy electron diffraction (LEED), scanning tunnelling microscopy (STM), non-contact atomic force microscopy (nc-AFM) and Kelvin probe force microscopy (KPFM). After oxidation at 550 °C, the ceria NPs and the Cu(111) support are fully oxidized, with the copper oxide exhibiting a new oxide structure as verified by LEED and STM. We show that a high H2dosage in the kilo Langmuir range is needed to entirely reduce the copper support at 550 °C. A work function (WF) difference of △ϕrCeria/Cu-Cu≈ -0.6 eV between the ceria NPs and the metallic Cu(111) support is measured, with the Cu(111) surface showing no signatures of separated and confined surface regions composed by an alloy of Cu and Ce. After oxidation, the WF difference is close to zero (△ϕCeria/Cu-Cu≈ -0.1…0 eV), which probably is due to a WF change of both, ceria and copper.
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Zhang J, Tang C, Qiu Q, Yang L. Effect of water on the diffusion of small molecular weight acids in nano-SiO2 modified insulating oil. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113670] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Shi J, Li H, Zhao W, Qi P, Wang H. Praseodymium hydroxide/gold-supported precursor: a new strategy for preparing stable and active catalyst for the water-gas shift reaction. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01263g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Rod-shaped praseodymium hydroxide (Pr(OH)x) as a hydroxyl- and O vacancy-rich support can promote the dispersion and stabilization of Au species show high activity and stability for water gas shift reaction, and holds great promise in the field of heterogeneous catalysis.
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Affiliation(s)
- Junjie Shi
- Shandong Applied Research Centre of Gold Nanotechnology
- School of Chemistry & Chemical Engineering
- Yantai University
- Yantai 264005
- China
| | - Hailian Li
- Shandong Applied Research Centre of Gold Nanotechnology
- School of Chemistry & Chemical Engineering
- Yantai University
- Yantai 264005
- China
| | - Weixuan Zhao
- Shandong Applied Research Centre of Gold Nanotechnology
- School of Chemistry & Chemical Engineering
- Yantai University
- Yantai 264005
- China
| | - Pengfei Qi
- State Key Laboratory of Bio-Fiber and Eco-textiles
- College of Materials Science and Engineering
- Collaborative Innovation Center for Marine Biobased Fibers and Ecological Textiles
- Institute of Marine Biobased Materials
- Qingdao University
| | - Hongxin Wang
- Shandong Applied Research Centre of Gold Nanotechnology
- School of Chemistry & Chemical Engineering
- Yantai University
- Yantai 264005
- China
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9
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Lockhorn M, Kasten PE, Tosoni S, Pacchioni G, Nilius N. Growth and characterization of Ca—Mo mixed oxide films on Mo(001). J Chem Phys 2019; 151:234708. [DOI: 10.1063/1.5129382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Maike Lockhorn
- Carl von Ossietzky Universität, Institut für Physik, D-26111 Oldenburg, Germany
| | - Peer Eike Kasten
- Carl von Ossietzky Universität, Institut für Physik, D-26111 Oldenburg, Germany
| | - Sergio Tosoni
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via Cozzi 53, 20125 Milano,
Italy
| | - Gianfranco Pacchioni
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via Cozzi 53, 20125 Milano,
Italy
| | - Niklas Nilius
- Carl von Ossietzky Universität, Institut für Physik, D-26111 Oldenburg, Germany
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10
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Shi J, Wittstock A, Mahr C, Murshed MM, Gesing TM, Rosenauer A, Bäumer M. Nanoporous gold functionalized with praseodymia-titania mixed oxides as a stable catalyst for the water-gas shift reaction. Phys Chem Chem Phys 2019; 21:3278-3286. [PMID: 30681677 DOI: 10.1039/c8cp06040a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dealloyed nanoporous metals hold great promise in the field of heterogeneous catalysis; however their tendency to coarsen at elevated temperatures or under catalytic reaction conditions sometimes limit further applications. Here, we report on a highly stable nanoporous gold catalyst (npAu) functionalized with praseodymia-titania mixed oxides as synthesized by a sol-gel method. Specifically, we used aberration-corrected transmission electron microscopy to study the morphology and the interface between the oxide deposits and the npAu substrate at the atomic level. Based on electron energy loss spectroscopy (EELS), it is concluded that Pr-TiOx mixed oxides form a solid solution. Flow reactor tests reveal that the Pr-TiOx functionalized nanoporous gold is not only highly active but also very stable for the water gas shift reaction in a large temperature range (180-400 °C). Our results demonstrate the potential of engineering the compositions of oxides coatings on npAu for advanced functional systems.
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Affiliation(s)
- Junjie Shi
- Institute of Applied and Physical Chemistry and Center for Environmental Research and Sustainable Technology, University of Bremen, Leobener Str. 6, 28359 Bremen, Germany.
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11
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Höcker J, Krisponeit JO, Cambeis J, Zakharov A, Niu Y, Wei G, Colombi Ciacchi L, Falta J, Schaefer A, Flege JI. Growth and structure of ultrathin praseodymium oxide layers on ruthenium(0001). Phys Chem Chem Phys 2018; 19:3480-3485. [PMID: 27827476 DOI: 10.1039/c6cp06853g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The growth, morphology, structure, and stoichiometry of ultrathin praseodymium oxide layers on Ru(0001) were studied using low-energy electron microscopy and diffraction, photoemission electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. At a growth temperature of 760 °C, the oxide is shown to form hexagonally close-packed (A-type) Pr2O3(0001) islands that are up to 3 nm high. Depending on the local substrate step density, the islands either adopt a triangular shape on sufficiently large terraces or acquire a trapezoidal shape with the long base aligned along the substrate steps.
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Affiliation(s)
- Jan Höcker
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
| | - Jon-Olaf Krisponeit
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany. and MAPEX Institute for Materials and Processes, University of Bremen, D-28359 Bremen, Germany
| | - Julian Cambeis
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
| | | | - Yuran Niu
- MAX IV Laboratory, Box 118, 221 00 Lund, Sweden
| | - Gang Wei
- Bremen Center for Computational Materials Science, Am Fallturm 1, D-28359 Bremen, Germany
| | - Lucio Colombi Ciacchi
- MAPEX Institute for Materials and Processes, University of Bremen, D-28359 Bremen, Germany and Bremen Center for Computational Materials Science, Am Fallturm 1, D-28359 Bremen, Germany
| | - Jens Falta
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany. and MAPEX Institute for Materials and Processes, University of Bremen, D-28359 Bremen, Germany
| | - Andreas Schaefer
- Division of Synchrotron Radiation Research, Lund University, 221 00 Lund, Sweden
| | - Jan Ingo Flege
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany. and MAPEX Institute for Materials and Processes, University of Bremen, D-28359 Bremen, Germany
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12
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Florea M, Postole G, Matei-Rutkovska F, Urda A, Neaţu F, Massin L, Gelin P. Influence of Gd and Pr doping on the properties of ceria: texture, structure, redox behaviour and reactivity in CH4/H2O reactions in the presence of H2S. Catal Sci Technol 2018. [DOI: 10.1039/c7cy02192e] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Resistance against thermal sintering, redox properties and catalytic activity in SMR over ceria can be tuned by doping/undoping.
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Affiliation(s)
- M. Florea
- Faculty of Chemistry
- Department of Organic Chemistry, Biochemistry and Catalysis
- University of Bucharest
- Bucharest
- Romania
| | - G. Postole
- CNRS
- IRCELYON
- Univ Lyon
- Université Claude Bernard Lyon 1
- Villeurbanne
| | | | - A. Urda
- Faculty of Chemistry
- Department of Organic Chemistry, Biochemistry and Catalysis
- University of Bucharest
- Bucharest
- Romania
| | - F. Neaţu
- National Institute of Materials Physics
- Bucharest
- Romania
| | - L. Massin
- CNRS
- IRCELYON
- Univ Lyon
- Université Claude Bernard Lyon 1
- Villeurbanne
| | - P. Gelin
- CNRS
- IRCELYON
- Univ Lyon
- Université Claude Bernard Lyon 1
- Villeurbanne
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A perfectly stoichiometric and flat CeO2(111) surface on a bulk-like ceria film. Sci Rep 2016; 6:21165. [PMID: 26879800 PMCID: PMC4754737 DOI: 10.1038/srep21165] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Accepted: 01/14/2016] [Indexed: 01/13/2023] Open
Abstract
In surface science and model catalysis, cerium oxide (ceria) is mostly grown as an ultra-thin film on a metal substrate in the ultra-high vacuum to understand fundamental mechanisms involved in diverse surface chemistry processes. However, such ultra-thin films do not have the contribution of a bulk ceria underneath, which is currently discussed to have a high impact on in particular surface redox processes. Here, we present a fully oxidized ceria thick film (180 nm) with a perfectly stoichiometric CeO2(111) surface exhibiting exceptionally large, atomically flat terraces. The film is well-suited for ceria model studies as well as a perfect substitute for CeO2 bulk material.
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