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Shudin NH, Eguchi R, Fujita T, Tokunaga T, Hashimoto A, Abe H. Phase textures of metal-oxide nanocomposites self-orchestrated by atomic diffusions through precursor alloys. Phys Chem Chem Phys 2024; 26:14103-14107. [PMID: 38695831 DOI: 10.1039/d3cp05157a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Metal-oxide nanocomposites (MONs) are of pivotal importance as electrode materials, yet lack a guiding principle to tune their phase texture. Here we report that the phase texture of MONs can be tuned at the nanoscale by controlling the nanophase separation of precursor alloys. In situ transmission electron microscopy (in situ TEM) has demonstrated that a MON material of platinum (Pt) and cerium oxide (CeO2) is obtained through promoted nanophase separation of a Pt5Ce precursor alloy in an atmosphere containing oxygen (O2) and carbon monoxide (CO). The Pt-CeO2 MON material comprised an alternating stack of nanometre-thick layers of Pt and CeO2 in different phase textures ranging from lamellae to mazes, depending on the O2 fraction in the atmosphere. Mathematical simulations have demonstrated that the phase texture of MONs originates from a balance in the atomic diffusions across the alloy precursor, which is controllable by the O2 fraction, temperature, and composition of the precursor alloys.
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Affiliation(s)
- Nasrat Hannah Shudin
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-00443, Japan.
- Graduate School of Science and Engineering, Saitama University, Shimo-Okubo 255, Saitama 338-8570, Japan
| | - Ryuto Eguchi
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-00443, Japan.
- Tsukuba University, 1-chome-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | | | - Tomoharu Tokunaga
- Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Ayako Hashimoto
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-00443, Japan.
- Tsukuba University, 1-chome-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Hideki Abe
- National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-00443, Japan.
- Graduate School of Science and Engineering, Saitama University, Shimo-Okubo 255, Saitama 338-8570, Japan
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Wen Y, Abe H, Mitsuishi K, Hashimoto A. Tracking the emergence of epitaxial metal-oxide interfaces from precursor alloys. NANOSCALE 2021; 13:18987-18995. [PMID: 34522917 DOI: 10.1039/d1nr03492h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Heterointerfaces with an epitaxial relationship, self-assembled nanocomposites of Pt(111)/CeO2(111) 60°, were successfully formed by simple oxidation of Pt5Ce alloy. Oxygen dissolution into the alloy causes spacial periodic compositional perturbation by atomic segregation, specifically, by local diffusion of Pt and Ce atoms. A striped pattern of Pt and CeO2 with a 4-5 nm periodicity formed through phase transformation of the Pt-rich alloy and oxidation of the Ce-rich alloy, respectively. Notably, a fully epitaxial relationship between the Pt and CeO2 phases was observed even in the initial stage. With continued annealing, the crystals rotated into an energetically favorable orientation with respect to the remaining (111)Pt//(111)CeO2. The alloy oxidation and its resulting nanoscale phase-separation behavior were verified in an ex situ annealing experiment of an alloy specimen, which had been first thinned by a focused ion beam. Changing the oxygen partial pressure to the reaction interface may alter the orientation relationship between the hexagonal close-packed Pt5Ce structure and face-centered cubic Pt/CeO2 structure, thereby altering the growth direction of the separated phases. These findings present a pathway for the self-assembly of epitaxial Pt(111)/CeO2(111) interface and are expected to assist the structural design of metal-oxide nanocomposites.
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Affiliation(s)
- Yu Wen
- National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
- Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Hideki Abe
- CREST, JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
- Graduate School of Science and Technology, Saitama University, 255 Shimookubo, Saitama 338-8570, Japan
| | - Kazutaka Mitsuishi
- National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
| | - Ayako Hashimoto
- National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
- Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
- PREST, JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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Liao P, Feng X, Fang H, Yang Z, Zhang J. Stabilized nanotube and nanofiber gel materials toward multifunctional adsorption. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127347] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Skowronski L, Trzcinski M, Olszewska A, Szczesny R. Microstructure and Optical Properties of Nanostructural Thin Films Fabricated through Oxidation of Au-Sn Intermetallic Compounds. MATERIALS 2021; 14:ma14144034. [PMID: 34300953 PMCID: PMC8307610 DOI: 10.3390/ma14144034] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/09/2021] [Accepted: 07/16/2021] [Indexed: 11/16/2022]
Abstract
AuSn and AuSn2 thin films (5 nm) were used as precursors during the formation of semiconducting metal oxide nanostructures on a silicon substrate. The nanoparticles were produced in the processes of annealing and oxidation of gold–tin intermetallic compounds under ultra-high vacuum conditions. The formation process and morphology of a mixture of SnO2 and Au@SnOx (the core–shell structure) nanoparticles or Au nanocrystalites were carefully examined by means of spectroscopic ellipsometry (SE), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) combined with energy-dispersive X-ray spectroscopy (EDX). The annealing and oxidation of the thin film of the AuSn intermetallic compound led to the formation of uniformly distributed structures with a size of ∼20–30 nm. All of the synthesized nanoparticles exhibited a strong absorption band at 520–530 nm, which is typical for pure metallic or metal oxide systems.
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Affiliation(s)
- Lukasz Skowronski
- Institute of Mathematics and Physics, UTP University of Science and Technology, Kaliskiego 7, 85-796 Bydgoszcz, Poland; (M.T.); (A.O.)
- Correspondence:
| | - Marek Trzcinski
- Institute of Mathematics and Physics, UTP University of Science and Technology, Kaliskiego 7, 85-796 Bydgoszcz, Poland; (M.T.); (A.O.)
| | - Aleksandra Olszewska
- Institute of Mathematics and Physics, UTP University of Science and Technology, Kaliskiego 7, 85-796 Bydgoszcz, Poland; (M.T.); (A.O.)
| | - Robert Szczesny
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, Gagarina 7, 87-100 Torun, Poland;
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Eads CN, Boscoboinik JA, Head AR, Hunt A, Waluyo I, Stacchiola DJ, Tenney SA. Enhanced Catalysis under 2D Silica: A CO Oxidation Study. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202013801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Calley N. Eads
- Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
| | - J. Anibal Boscoboinik
- Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
| | - Ashley R. Head
- Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
| | - Adrian Hunt
- National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA
| | - Iradwikanari Waluyo
- National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA
| | - Dario J. Stacchiola
- Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
| | - Samuel A. Tenney
- Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
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Eads CN, Boscoboinik JA, Head AR, Hunt A, Waluyo I, Stacchiola DJ, Tenney SA. Enhanced Catalysis under 2D Silica: A CO Oxidation Study. Angew Chem Int Ed Engl 2021; 60:10888-10894. [PMID: 33462957 DOI: 10.1002/anie.202013801] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Indexed: 11/11/2022]
Abstract
Interfacially confined microenvironments have recently gained attention in catalysis, as they can be used to modulate reaction chemistry. The emergence of a 2D nanospace at the interface between a 2D material and its support can promote varying kinetic and energetic schemes based on molecular level confinement effects imposed in this reduced volume. We report on the use of a 2D oxide cover, bilayer silica, on catalytically active Pd(111) undergoing the CO oxidation reaction. We "uncover" mechanistic insights about the structure-activity relationship with and without a 2D silica overlayer using in situ IR and X-ray spectroscopy and mass spectrometry methods. We find that the CO oxidation reaction on Pd(111) benefits from confinement effects imposed on surface adsorbates under 2D silica. This interaction results in a lower and more dispersed coverage of CO adsorbates with restricted CO adsorption geometries, which promote oxygen adsorption and lay the foundation for the formation of a reactive surface oxide that produces higher CO2 formation rates than Pd alone.
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Affiliation(s)
- Calley N Eads
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - J Anibal Boscoboinik
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Ashley R Head
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Adrian Hunt
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Iradwikanari Waluyo
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Dario J Stacchiola
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Samuel A Tenney
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA
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