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Jatav H, Shabaninezhad M, Mičetić M, Chakravorty A, Mishra A, Schwartzkopf M, Chumakov A, Roth SV, Kabiraj D. A Combinatorial Study Investigating the Growth of Ultrasmall Embedded Silver Nanoparticles upon Thermal Annealing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:11983-11993. [PMID: 36150131 DOI: 10.1021/acs.langmuir.2c01730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Ultrasmall nanoparticles (NPs) with a high active surface area are essential for optoelectronic and photovoltaic applications. However, the structural stability and sustainability of these ultrasmall NPs at higher temperatures remain a critical problem. Here, we have synthesized the nanocomposites (NCs) of Ag NPs inside the silica matrix using the atom beam co-sputtering technique. The post-deposition growth of the embedded Ag NPs is systematically investigated at a wide range of annealing temperatures (ATs). A novel, fast, and effective procedure, correlating the experimental (UV-vis absorption results) and theoretical (quantum mechanical modeling, QMM) results, is used to estimate the size of NPs. The QMM-based simulation, employed for this work, is found to be more accurate in reproducing the absorption spectra over the classical/modified Drude model, which fails to predict the expected shift in the LSPR for ultrasmall NPs. Unlike the classical Drude model, the QMM incorporates the intraband transition of the conduction band electrons to calculate the effective dielectric function of metallic NCs, which is the major contribution of LSPR shifts for ultrasmall NPs. In this framework, a direct comparison is made between experimentally and theoretically observed LSPR peak positions, and it is observed that the size of NPs grows from 3 to 18 nm as AT increases from room temperature to 900 °C. Further, in situ grazing-incidence small- & wide-angle X-ray scattering and transmission electron microscopy measurements are employed to comprehend the growth of Ag NPs and validate the UV + QMM results. We demonstrate that, unlike chemically grown NPs, the embedded Ag NPs ensure greater stability in size and remain in an ultrasmall regime up to 800 °C, and beyond this temperature, the size of NPs increases exponentially due to dominant Ostwald ripening. Finally, a three-stage mechanism is discussed to understand the process of nucleation and growth of the silica-embedded Ag NPs.
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Affiliation(s)
- Hemant Jatav
- Materials science department, Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Masoud Shabaninezhad
- Department of Physics, Western Michigan University, Kalamazoo, Michigan, 49008, United States
| | - Maja Mičetić
- Ruđer Bošković Institute, Bijenička cesta 54, Zagreb 10000, Croatia
| | - Anusmita Chakravorty
- Materials science department, Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Ambuj Mishra
- Materials science department, Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
| | | | - Andrei Chumakov
- Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, D-22607 Hamburg, Germany
| | - Stephan V Roth
- Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, D-22607 Hamburg, Germany
- Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| | - Debdulal Kabiraj
- Materials science department, Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
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2
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Ro G, Hwang DK, Kim Y. Hydrogen generation using Pt/Ni bimetallic nanoparticles supported on Fe3O4@SiO2@TiO2 multi-shell microspheres. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.07.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Zhang Z, Shi H, Wu Q, Bu X, Yang Y, Zhang J, Huang Y. MOF-derived CeO2/Au@SiO2 hollow nanotubes and their catalytic activity toward 4-nitrophenol reduction. NEW J CHEM 2019. [DOI: 10.1039/c8nj05745a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A hollow CeO2/Au@SiO2 sandwiched nanocatalyst with enhanced catalytic activity was prepared by using Ce-MOF as a sacrificial template.
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Affiliation(s)
- Zewu Zhang
- School of Materials Science and Engineering
- Nanjing Institute of Technology
- Nanjing 21167
- P. R. China
- Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology
| | - Haojun Shi
- School of Materials Science and Engineering
- Nanjing Institute of Technology
- Nanjing 21167
- P. R. China
- Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology
| | - Qiong Wu
- School of Materials Science and Engineering
- Nanjing Institute of Technology
- Nanjing 21167
- P. R. China
- Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology
| | - Xiaohai Bu
- School of Materials Science and Engineering
- Nanjing Institute of Technology
- Nanjing 21167
- P. R. China
- Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology
| | - Yunfeng Yang
- School of Materials Science and Engineering
- Nanjing Institute of Technology
- Nanjing 21167
- P. R. China
- Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology
| | - Jie Zhang
- School of Materials Science and Engineering
- Nanjing Institute of Technology
- Nanjing 21167
- P. R. China
- Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology
| | - Yue Huang
- School of Materials Science and Engineering
- Nanjing Institute of Technology
- Nanjing 21167
- P. R. China
- Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology
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4
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Byoun W, Jung S, Tran NM, Yoo H. Synthesis and Application of Dendritic Fibrous Nanosilica/Gold Hybrid Nanomaterials. ChemistryOpen 2018; 7:349-355. [PMID: 29872610 PMCID: PMC5974554 DOI: 10.1002/open.201800040] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Indexed: 12/17/2022] Open
Abstract
Morphologically unique silica nanoparticles can be used as effective templates to prepare silica-metal hybrid nanomaterials, which are highly applicable in a variety of areas. Mesoporous silica nanoparticles, which have high surface areas and an abundance of pores, can be used to synthesize mesoporous silica core-metal shell nanostructures with catalytically active sites. In this work, dendritic fibrous nanosilica (DFNS) with a high surface area is successfully employed as a template to synthesize DFNS/Au hybrid nanomaterials. Au nanodots are initially synthesized through the selective reduction of Au ions on the surface of the DFNS after surface modification to form DFNS/Au dots. A seed-mediated growth method is used to controllably grow Au nanoparticles on the DFNS/Au dots to generate DFNS core-Au nanoparticles shell nanohybrids (DFNS/Au NPs) and DFNS core-Au layer shell nanohybrids (DFNS/Au layers). The catalytic activities of DFNS/Au NPs and DFNS/Au layers in the 4-nitrophenol reduction reaction are compared.
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Affiliation(s)
- Wongyun Byoun
- Department of ChemistryHallym UniversityChuncheon, Gangwon-do24252Republic of Korea
| | - Soeun Jung
- Department of ChemistryHallym UniversityChuncheon, Gangwon-do24252Republic of Korea
| | - Ngoc Minh Tran
- Department of ChemistryHallym UniversityChuncheon, Gangwon-do24252Republic of Korea
| | - Hyojong Yoo
- Department of ChemistryHallym UniversityChuncheon, Gangwon-do24252Republic of Korea
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Tong J, Ma W, Wang W, Ma J, Li W, Bo L, Fan H. Nitrogen/phosphorus dual-doped hierarchically porous graphitic biocarbon with greatly improved performance on oxygen reduction reaction in alkaline media. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.12.055] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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6
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Platinum Nanoparticle-embedded Porous Diamond Spherical Particles as an Active and Stable Heterogeneous Catalyst. Sci Rep 2017; 7:8651. [PMID: 28819241 PMCID: PMC5561195 DOI: 10.1038/s41598-017-08949-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 07/20/2017] [Indexed: 01/02/2023] Open
Abstract
Platinum nanoparticle-embedded porous diamond spherical particles (PtNP@PDSPs), as an active and stable catalyst, were fabricated by spray-drying of an aqueous slurry containing nanodiamond (ND) particles, platinum nanoparticles (PtNP), and polyethylene glycol (PEG) to form ND/PtNP/PEG composite spherical particles, followed by removal of PEG and a short-time diamond growth on the surface. The average diameter of the PtNP@PDSPs can be controlled in the range of 1–5 μm according to the spray-drying conditions. The Brunauer-Emmett-Teller (BET) surface area and average pore diameter of the PtNP@PDSPs were estimated to be ca. 170–300 m2 g−1 and ca. 4–13 nm, respectively. When ND with the size of 20–30 nm was used, the size of PtNP in the PtNP@PDSP was almost unchanged at 5–6 nm even after high temperature processes and reuse test for catalytic reaction, showing stable supporting. The catalytic activity of the PtNP@PDSPs for the dehydrogenation of cyclohexane was higher than that for a Pt/C catalyst, which is attributed to the stable PtNP support by the three-dimensional packing of ND and efficient mass transfer via the interconnected through-hole pores in the PDSPs.
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7
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Magnetically-Separable and Thermally-Stable Au Nanoparticles Encapsulated in Mesoporous Silica for Catalytic Applications. Top Catal 2017. [DOI: 10.1007/s11244-017-0785-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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8
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Adhikary J, Meistelman M, Burg A, Shamir D, Meyerstein D, Albo Y. Reductive Dehalogenation of Monobromo‐ and Tribromoacetic Acid by Sodium Borohydride Catalyzed by Gold Nanoparticles Entrapped in Sol–Gel Matrices Follows Different Pathways. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700069] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | | | - Ariela Burg
- Chemical Engineering Department Sami Shamoon College of Engineering Beer‐Sheva Israel
| | - Dror Shamir
- Chemistry Department Nuclear Research Centre Negev Beer‐Sheva Israel
| | - Dan Meyerstein
- Chemical Sciences Department Ariel University Ariel Israel
- Chemistry Department Ben‐Gurion University Beer‐Sheva Israel
| | - Yael Albo
- Chemical Engineering Department Ariel University Ariel Israel
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Hong W, Yan X, Li R, Fan J. Gold nanoparticle stabilization within tailored cubic mesoporous silica: Optimizing alcohol oxidation activity. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(17)62762-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Shajkumar A, Nandan B, Sanwaria S, Albrecht V, Libera M, Lee MH, Auffermann G, Stamm M, Horechyy A. Silica-supported Au@hollow-SiO 2 particles with outstanding catalytic activity prepared via block copolymer template approach. J Colloid Interface Sci 2016; 491:246-254. [PMID: 28039806 DOI: 10.1016/j.jcis.2016.12.051] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 12/14/2016] [Accepted: 12/19/2016] [Indexed: 12/31/2022]
Abstract
Catalytically active Au@hollow-SiO2 particles embedded in porous silica support (Au@hollow-SiO2@PSS) were prepared by using spherical micelles from poly(styrene)-block-poly(4-vinyl pyridine) block copolymer as a sacrificial template. Drastic increase of the shell porosity was observed after pyrolytic removal of polymeric template because the stretched poly(4-vinyl pyridine) chains interpenetrating with silica shell acted as an effective porogen. The embedding of Au@hollow-SiO2 particles in porous silica support prevented their fusion during pyrolysis. The catalytic activity of Au@hollow-SiO2@PSS was investigated using a model reaction of catalytic reduction of 4-nitrophenol and reductive degradation of Congo red azo-dye. Significantly, to the best of our knowledge, Au@hollow-SiO2@PSS catalyst shows the highest activity among analogous systems reported till now in literature. Such high activity was attributed to the presence of multiple pores within silica shell of Au@hollow-SiO2 particles and easy accessibility of reagents to the catalytically active sites of the ligand-free gold surface through the porous silica support.
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Affiliation(s)
- Aruni Shajkumar
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, Dresden 01069, Germany
| | - Bhanu Nandan
- Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
| | - Sunita Sanwaria
- Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Victoria Albrecht
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, Dresden 01069, Germany
| | - Marcin Libera
- Center of Polymer and Carbon Materials, Polish Academy of Science, M. Curie-Sklodowskej 34, 41-819 Zabrze, Poland
| | - Myong-Hoon Lee
- The Graduate School of Flexible and Printable Electronics, Center for Polymer Fusion Technology, Chonbuk National University, Jeonju, Chonbuk 561-756, South Korea
| | - Gudrun Auffermann
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straβe 40, D-01187 Dresden, Germany
| | - Manfred Stamm
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, Dresden 01069, Germany; Technische Universität Dresden, Physical Chemistry of Polymer Materials, Dresden 01062, Germany.
| | - Andriy Horechyy
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, Dresden 01069, Germany.
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11
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Petrov A, Lehmann H, Finsel M, Klinke C, Weller H, Vossmeyer T. Synthesis and Characterization of Monodisperse Metallodielectric SiO2@Pt@SiO2 Core-Shell-Shell Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:848-857. [PMID: 26731341 DOI: 10.1021/acs.langmuir.5b03631] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Metallodielectric nanostructured core-shell-shell particles are particularly desirable for enabling novel types of optical components, including narrow-band absorbers, narrow-band photodetectors, and thermal emitters, as well as new types of sensors and catalysts. Here, we present a facile approach for the preparation of submicron SiO2@Pt@SiO2 core-shell-shell particles. As shown by transmission and scanning electron microscopy, the first steps of this approach allow for the deposition of closed and almost perfectly smooth platinum shells onto silica cores via a seeded growth mechanism. By choosing appropriate conditions, the shell thickness could be adjusted precisely, ranging from ∼3 to ∼32 nm. As determined by X-ray diffraction, the crystalline domain sizes of the polycrystalline metal shells were ∼4 nm, regardless of the shell thickness. The platinum content of the particles was determined by atomic absorption spectroscopy and for thin shells consistent with a dense metal layer of the TEM-measured thickness. In addition, we show that the roughness of the platinum shell strongly depends on the storage time of the gold seeds used to initiate reductive platinum deposition. Further, using polyvinylpyrrolidone as adhesion layer, it was possible to coat the metallic shells with very homogeneous and smooth insulating silica shells of well-controlled thicknesses between ∼2 and ∼43 nm. After depositing the particles onto silicon substrates equipped with interdigitated electrode structures, the metallic character of the SiO2@Pt particles and the insulating character of the SiO2 shells of the SiO2@Pt@SiO2 particles were successfully demonstrated by charge transport measurements at variable temperatures.
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Affiliation(s)
- Alexey Petrov
- Institute of Physical Chemistry, University of Hamburg , Grindelallee 117, D-20146 Hamburg, Germany
| | - Hauke Lehmann
- Institute of Physical Chemistry, University of Hamburg , Grindelallee 117, D-20146 Hamburg, Germany
| | - Maik Finsel
- Institute of Physical Chemistry, University of Hamburg , Grindelallee 117, D-20146 Hamburg, Germany
| | - Christian Klinke
- Institute of Physical Chemistry, University of Hamburg , Grindelallee 117, D-20146 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, D-22761 Hamburg, Germany
| | - Horst Weller
- Institute of Physical Chemistry, University of Hamburg , Grindelallee 117, D-20146 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, D-22761 Hamburg, Germany
- Department of Chemistry, Faculty of Science, King Abdulaziz University , Jeddah, Saudi Arabia
| | - Tobias Vossmeyer
- Institute of Physical Chemistry, University of Hamburg , Grindelallee 117, D-20146 Hamburg, Germany
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12
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Wu ZQ, Ji YG, Zhai YN, Li SN, Lee JM. The facile ionic liquid-assisted synthesis of hollow and porous platinum nanotubes with enhanced catalytic performances. RSC Adv 2016. [DOI: 10.1039/c6ra13451c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A facile one-pot synthetic method was developed to synthesize hollow and porous Pt nanotubes (Pt-HPNTs) using silica nanorods as a template, ionic liquid as a precipitator and reductant, and in situ generated KCl as an etching agent.
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Affiliation(s)
- Zhu-Qing Wu
- Key Laboratory of Macromolecular Science of Shaanxi Province
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710062
- PR China
| | - Yi-Gang Ji
- Jiangsu Key Laboratory of Biofunction Molecule
- Department of Life Sciences and Chemistry
- Jiangsu Second Normal University
- Nanjing 210013
- PR China
| | - Ya-Nan Zhai
- Key Laboratory of Macromolecular Science of Shaanxi Province
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710062
- PR China
| | - Shu-Ni Li
- Key Laboratory of Macromolecular Science of Shaanxi Province
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710062
- PR China
| | - Jong-Min Lee
- School of Chemical and Biomedical Engineering
- Nanyang Technological University
- Singapore 637459
- Singapore
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13
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Wang C, Lin X, Ge Y, Shah ZH, Lu R, Zhang S. Silica-supported ultra small gold nanoparticles as nanoreactors for the etherification of silanes. RSC Adv 2016. [DOI: 10.1039/c6ra22359a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ultra-small Au–SiO2 nanoparticles worked as nanoreactors for the etherification of silanes with high selectivity and reusability.
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Affiliation(s)
- Cui Wang
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian
- People's Republic of China
| | - Xijie Lin
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian
- People's Republic of China
| | - Yuzhen Ge
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian
- People's Republic of China
| | - Zameer Hussain Shah
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian
- People's Republic of China
| | - Rongwen Lu
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian
- People's Republic of China
| | - Shufen Zhang
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian
- People's Republic of China
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14
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Wang D, Jiao Z, Wu M, Gu L, Chen Z, Zhang H. A simple, rapid, one-step approach for preparation of Ag@TiO2 nanospheres with multiple cores as effective catalyst. RSC Adv 2016. [DOI: 10.1039/c6ra21173a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Novel Ag@TiO2 nanostructures with multiple Ag nanoparticles as cores and a crystalline TiO2 as the outer shell have been successfully achieved via a facile and one-step solvothermal route.
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Affiliation(s)
- Donghai Wang
- Institute of Nanochemistry and Nanobiology
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Zheng Jiao
- School of Environmental and Chemical Engineering
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Minghong Wu
- School of Environmental and Chemical Engineering
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Lanbing Gu
- Institute of Nanochemistry and Nanobiology
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Zhiwen Chen
- School of Environmental and Chemical Engineering
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Haijiao Zhang
- Institute of Nanochemistry and Nanobiology
- Shanghai University
- Shanghai 200444
- P. R. China
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Liu D, Li W, Feng X, Zhang Y. Galvanic replacement synthesis of Ag x Au 1-x @CeO 2 (0 ≤ x ≤ 1) core@shell nanospheres with greatly enhanced catalytic performance. Chem Sci 2015; 6:7015-7019. [PMID: 28808522 PMCID: PMC5532536 DOI: 10.1039/c5sc02774h] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 09/07/2015] [Indexed: 12/18/2022] Open
Abstract
A galvanic replacement strategy has been successfully adopted to design Ag x Au1-x @CeO2 core@shell nanospheres derived from Ag@CeO2 ones. After etching using HAuCl4, the Ag core was in situ replaced with Ag x Au1-x alloy nanoframes, and void spaces were left under the CeO2 shell. Among the as-prepared Ag x Au1-x @CeO2 catalysts, Ag0.64Au0.36@CeO2 shows the optimal catalytic performance, whose catalytic efficiency reaches even 2.5 times higher than our previously reported Pt@CeO2 nanospheres in the catalytic reduction of 4-nitrophenol (4-NP) by ammonia borane (AB). Besides, Ag0.64Au0.36@CeO2 also exhibits a much lower 100% conversion temperature of 120 °C for catalytic CO oxidation compared with the other samples.
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Affiliation(s)
- Dapeng Liu
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education , School of Chemistry and Environment , Beihang University , Beijing 100191 , China .
| | - Wang Li
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education , School of Chemistry and Environment , Beihang University , Beijing 100191 , China .
| | - Xilan Feng
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education , School of Chemistry and Environment , Beihang University , Beijing 100191 , China .
| | - Yu Zhang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education , School of Chemistry and Environment , Beihang University , Beijing 100191 , China .
- International Research Institute for Multidisciplinary Science , Beihang University , Beijing 100191 , P. R. China
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