1
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Liu P, Battie Y, Kimura T, Okazaki Y, Pranee P, Wang H, Pouget E, Nlate S, Sagawa T, Oda R. Chiral Perovskite Nanocrystal Growth inside Helical Hollow Silica Nanoribbons. NANO LETTERS 2023; 23:3174-3180. [PMID: 37052340 DOI: 10.1021/acs.nanolett.2c04823] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Helical perovskite nanocrystals (H-PNCs) were prepared using nanometric silica helical ribbons as platforms for the in situ growth of the crystals using the supersaturated recrystallization method. The H-PNCs grow inside nanometric helical porous silica, and their handedness is determined by the handedness of porous silica templates. They show both strong induced circular dichroism (CD) and strong induced circularly polarized luminescence (CPL) signals, with high dissymmetry g-factors. Right-handed and left-handed PNCs show respectively positive and negative CD and CPL signals, with a dissymmetry g-factor (abs and lum) of ∼±2 × 10-2. Simulations based on the boundary element method demonstrate that the circular dichroism originates from the chiral shape of H-PNCs.
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Affiliation(s)
- Peizhao Liu
- Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France
- Graduate School of Energy Science, Kyoto University, 606-8501 Kyoto, Japan
| | - Yann Battie
- Université de Lorraine, Laboratoire de Chimie et Physique - Approche Multi-échelles des milieux Complexes, (LCP-A2MC), 57078 Metz, France
| | - Takaki Kimura
- Graduate School of Energy Science, Kyoto University, 606-8501 Kyoto, Japan
| | - Yutaka Okazaki
- Graduate School of Energy Science, Kyoto University, 606-8501 Kyoto, Japan
| | - Piyanan Pranee
- Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France
| | - Hao Wang
- Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France
| | - Emilie Pouget
- Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France
| | - Sylvain Nlate
- Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France
| | - Takashi Sagawa
- Graduate School of Energy Science, Kyoto University, 606-8501 Kyoto, Japan
| | - Reiko Oda
- Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France
- WPI-Advanced Institute for Materials Research, Tohoku University, Katahira, Aoba-Ku, 980-8577 Sendai, Japan
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2
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Meitei PN, Alam MW, Ngangbam C, Singh NK. Enhanced UV photodetection characteristics of annealed Gd2O3 nanorods. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01787-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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3
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Sohmiya M, Umehara S, Enomoto S, Ide Y, Okada T, Sugahara Y, Ogawa M. Pore shape-reflecting morphosynthesis of lithium niobium oxide via mixed chloride flux growth in the presence of mesoporous silica. NANOSCALE ADVANCES 2019; 1:1726-1730. [PMID: 36134233 PMCID: PMC9419088 DOI: 10.1039/c9na00097f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 04/09/2019] [Indexed: 06/16/2023]
Abstract
A new synthesis method, "chloride flux growth in the rigid nanospace of mesoporous silica", was developed to obtain lithium niobium oxide anisotropic nanoparticles. The morphologies reflect the pore size and shape of the used mesoporous silicas. This method has great potential for synthesizing size-tuned anisotropic nanoparticles of other complex metal oxides.
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Affiliation(s)
- Minoru Sohmiya
- Department of Materials and Life Science, Faculty of Science and Technology, Seikei University 3-3-1 Kichijojikitamachi Musashino-shi Tokyo 180-8633 Japan
- Department of Earth Sciences, Waseda University 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
- Kagami Memorial Laboratory for Materials Science and Technology (Zaiken), Waseda University 2-8-26 Nishiwaseda, Shinjuku-ku Tokyo 169-0051 Japan
| | - Shinya Umehara
- Graduate School of Creative Science and Engineering, Waseda University 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
| | - Shinpei Enomoto
- Kagami Memorial Laboratory for Materials Science and Technology (Zaiken), Waseda University 2-8-26 Nishiwaseda, Shinjuku-ku Tokyo 169-0051 Japan
| | - Yusuke Ide
- Graduate School of Creative Science and Engineering, Waseda University 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
| | - Tomohiko Okada
- Graduate School of Creative Science and Engineering, Waseda University 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
- Department of Chemistry and Materials Engineering, Faculty of Engineering, Shinshu University 4-17-1 Wakasato Nagano 380-8553 Japan
| | - Yoshiyuki Sugahara
- Kagami Memorial Laboratory for Materials Science and Technology (Zaiken), Waseda University 2-8-26 Nishiwaseda, Shinjuku-ku Tokyo 169-0051 Japan
- Graduate School of Creative Science and Engineering, Waseda University 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
- Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University 3-4-1 Ohkubo, Shinjuku-ku Tokyo 169-8555 Japan
| | - Makoto Ogawa
- Department of Earth Sciences, Waseda University 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
- Graduate School of Creative Science and Engineering, Waseda University 1-6-1 Nishiwaseda, Shinjuku-ku Tokyo 169-8050 Japan
- School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology 555 Moo 1, Payupnai, Wangchan Rayong 21210 Thailand
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Nishanthi ST, Yadav KK, Baruah A, Vaghasiya K, Verma RK, Ganguli AK, Jha M. Nanostructured silver decorated hollow silica and their application in the treatment of microbial contaminated water at room temperature. NEW J CHEM 2019. [DOI: 10.1039/c9nj01049a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Effect of silver decoration on hollow silica and its antimicrobial properties.
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Affiliation(s)
- S. T. Nishanthi
- Institute of Nano Science & Technology
- Habitat Centre
- Mohali
- India
- Electrochemical Power Sources Division
| | | | - Arabinda Baruah
- Institute of Nano Science & Technology
- Habitat Centre
- Mohali
- India
| | | | | | - Ashok K. Ganguli
- Institute of Nano Science & Technology
- Habitat Centre
- Mohali
- India
- Department of Chemistry
| | - Menaka Jha
- Institute of Nano Science & Technology
- Habitat Centre
- Mohali
- India
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5
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Venkataravanappa M, Nagabhushana H, Darshan GP, Daruka Prasad B, Vijayakumar GR, Premkumar HB. Novel EGCG assisted ultrasound synthesis of self-assembled Ca2SiO4:Eu(3+) hierarchical superstructures: Photometric characteristics and LED applications. ULTRASONICS SONOCHEMISTRY 2016; 33:226-239. [PMID: 27245974 DOI: 10.1016/j.ultsonch.2016.03.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Revised: 03/27/2016] [Accepted: 03/30/2016] [Indexed: 06/05/2023]
Abstract
This paper reports for the first time ultrasound, EGCG assisted synthesis of pure and Eu(3+) (1-5mol%) activated Ca2SiO4 nanophosphors having self-assembled superstructures with high purity. The shape, size and morphology of the product were tuned by controlling influential parameters. It was found that morphology was highly dependent on EGCG concentration, sonication time, pH and sonication power. The probable formation mechanism for various hierarchical superstructures was proposed. The PL studies of Ca2SiO4:Eu(3+) phosphors can be effectively excited by the near ultraviolet (UV) (396nm) light and exhibited strong red emission around 613nm, which was attributed to the Eu(3+) ((5)D0→(7)F2) transition. The concentration quenching phenomenon was explained based on energy transfer between defect and Eu(3+) ions, electron-phonon coupling and Eu(3+)-Eu(3+) interaction. The Judd-Ofelt intensity parameters and radiative properties were estimated by using PL emission spectra. The photometric studies indicate that the obtained phosphors could be a promising red component for possible applications in the field of white light emitting diodes.
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Affiliation(s)
- M Venkataravanappa
- Department of Physics, Govt. First Grade College, Sira, Tumkur 572 103, India; Research and Development Center, Bharathiar University, Coimbatore 641046, India
| | - H Nagabhushana
- Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India.
| | - G P Darshan
- Department of Physics, Acharya Institute of Graduate Studies, Bangalore 560 107, India; Research and Development Center, Bharathiar University, Coimbatore 641046, India
| | - B Daruka Prasad
- Department of Physics, BMS Institute of Technology and Management, VTU-affiliated, Bangalore 560 064, India
| | - G R Vijayakumar
- Department of Chemistry, University College of Science, Tumkur University, Tumkur 572 103, India
| | - H B Premkumar
- Department of Physics, Dayananda Sagar Academy of Technology and Management, Bangalore 560082, India
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6
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Dirin D, Protesescu L, Trummer D, Kochetygov IV, Yakunin S, Krumeich F, Stadie NP, Kovalenko MV. Harnessing Defect-Tolerance at the Nanoscale: Highly Luminescent Lead Halide Perovskite Nanocrystals in Mesoporous Silica Matrixes. NANO LETTERS 2016; 16:5866-74. [PMID: 27550860 PMCID: PMC5799875 DOI: 10.1021/acs.nanolett.6b02688] [Citation(s) in RCA: 233] [Impact Index Per Article: 29.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 08/21/2016] [Indexed: 05/19/2023]
Abstract
Colloidal lead halide perovskite nanocrystals (NCs) have recently emerged as a novel class of bright emitters with pure colors spanning the entire visible spectral range. Contrary to conventional quantum dots, such as CdSe and InP NCs, perovskite NCs feature unusual, defect-tolerant photophysics. Specifically, surface dangling bonds and intrinsic point defects such as vacancies do not form midgap states, known to trap carriers and thereby quench photoluminescence (PL). Accordingly, perovskite NCs need not be electronically surface-passivated (with, for instance, ligands and wider-gap materials) and do not noticeably suffer from photo-oxidation. Novel opportunities for their preparation therefore can be envisaged. Herein, we show that the infiltration of perovskite precursor solutions into the pores of mesoporous silica, followed by drying, leads to the template-assisted formation of perovskite NCs. The most striking outcome of this simple methodology is very bright PL with quantum efficiencies exceeding 50%. This facile strategy can be applied to a large variety of perovskite compounds, hybrid and fully inorganic, with the general formula APbX3, where A is cesium (Cs), methylammonium (MA), or formamidinium (FA), and X is Cl, Br, I or a mixture thereof. The luminescent properties of the resulting templated NCs can be tuned by both quantum size effects as well as composition. Also exhibiting intrinsic haze due to scattering within the composite, such materials may find applications as replacements for conventional phosphors in liquid-crystal television display technologies and in related luminescence down-conversion-based devices.
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Affiliation(s)
- Dmitry
N. Dirin
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa—Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
| | - Loredana Protesescu
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa—Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
| | - David Trummer
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Ilia V. Kochetygov
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Sergii Yakunin
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa—Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
| | - Frank Krumeich
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Nicholas P. Stadie
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa—Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
| | - Maksym V. Kovalenko
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa—Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
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7
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Velmurugan P, Shim J, Lee KJ, Cho M, Lim SS, Seo SK, Cho KM, Bang KS, Oh BT. Extraction, characterization, and catalytic potential of amorphous silica from corn cobs by sol-gel method. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2015.04.009] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Zhang B, Yang S, Zhang Y, Wang Q, Ren T. Biotemplate-directed fabrication of size-controlled monodisperse magnetic silica microspheres. Colloids Surf B Biointerfaces 2015; 131:129-35. [DOI: 10.1016/j.colsurfb.2015.04.060] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2015] [Revised: 04/10/2015] [Accepted: 04/27/2015] [Indexed: 10/23/2022]
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9
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Gupta SK, Ghosh PS, Arya A, Natarajan V. Origin of blue emission in ThO2 nanorods: exploring it as a host for photoluminescence of Eu3+, Tb3+ and Dy3+. RSC Adv 2014. [DOI: 10.1039/c4ra09681a] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nanorods of ThO2 were synthesized in a reverse micelle technique using cetyl trimethyl ammonium bromide as a surfactant and characterized by X-ray diffraction and transmission electron microscopy.
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Affiliation(s)
- Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085, India
| | - P. S. Ghosh
- Materials Science Division
- Bhabha Atomic Research Centre
- Mumbai-400085, India
| | - A. Arya
- Materials Science Division
- Bhabha Atomic Research Centre
- Mumbai-400085, India
| | - V. Natarajan
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085, India
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10
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Kamalakar G, Zhai QZ, Hwang DW, Chien SH, Yang YH, Lin JD, Chen YT, Hwang LP. Optical Properties of Host(SBA-15)-guest(AgI) Composite Materials. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200300008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Carenco S, Portehault D, Boissière C, Mézailles N, Sanchez C. Nanoscaled Metal Borides and Phosphides: Recent Developments and Perspectives. Chem Rev 2013; 113:7981-8065. [DOI: 10.1021/cr400020d] [Citation(s) in RCA: 756] [Impact Index Per Article: 68.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Sophie Carenco
- Chimie de la Matière Condensée de Paris, UPMC Univ Paris 06, UMR 7574, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
- Chimie de la Matière Condensée de Paris, CNRS, UMR 77574, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05, France
- Chimie de la Matière Condensée de Paris, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05, France
- Laboratory Heteroelements and Coordination, Chemistry Department, Ecole Polytechnique, CNRS-UMR 7653, Palaiseau, France
| | - David Portehault
- Chimie de la Matière Condensée de Paris, UPMC Univ Paris 06, UMR 7574, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
- Chimie de la Matière Condensée de Paris, CNRS, UMR 77574, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05, France
- Chimie de la Matière Condensée de Paris, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05, France
| | - Cédric Boissière
- Chimie de la Matière Condensée de Paris, UPMC Univ Paris 06, UMR 7574, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
- Chimie de la Matière Condensée de Paris, CNRS, UMR 77574, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05, France
- Chimie de la Matière Condensée de Paris, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05, France
| | - Nicolas Mézailles
- Laboratory Heteroelements and Coordination, Chemistry Department, Ecole Polytechnique, CNRS-UMR 7653, Palaiseau, France
| | - Clément Sanchez
- Chimie de la Matière Condensée de Paris, UPMC Univ Paris 06, UMR 7574, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
- Chimie de la Matière Condensée de Paris, CNRS, UMR 77574, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05, France
- Chimie de la Matière Condensée de Paris, Collège de France, 11 Place Marcellin Berthelot, 75231 Paris Cedex 05, France
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Structural and catalytic properties of a novel vanadium containing solid core mesoporous silica shell catalysts for gas phase oxidation reaction. J CHEM SCI 2013. [DOI: 10.1007/s12039-013-0365-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Characterization and luminescence properties of Gd2O3 phosphor. RESEARCH ON CHEMICAL INTERMEDIATES 2013. [DOI: 10.1007/s11164-013-1080-9] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Venkatathri N, Nookaraju M, Rajini A, Reddy I. Titanium Containing Solid Core Mesoporous Silica Shell: A Novel Efficient Catalyst for Ammoxidation Reactions. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.1.143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Li Y, Wang J, Chain W, Wang X, Jin Z, Li X. Coordination assembly and characterization of europium(iii) complexes covalently bonded to SBA-15 directly functionalized by modified polymer. RSC Adv 2013. [DOI: 10.1039/c3ra41210e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Dutta DP, Ballal A, Singh A, Fulekar MH, Tyagi AK. Multifunctionality of rare earth doped nano ZnSb2O6, CdSb2O6 and BaSb2O6: photocatalytic properties and white light emission. Dalton Trans 2013; 42:16887-97. [DOI: 10.1039/c3dt51966j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Watanabe H, Fujikata K, Oaki Y, Imai H. Band-gap expansion of tungsten oxide quantum dots synthesized in sub-nano porous silica. Chem Commun (Camb) 2013; 49:8477-9. [DOI: 10.1039/c3cc44264k] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Sasidharan M, Zenibana H, Nandi M, Bhaumik A, Nakashima K. Synthesis of mesoporous hollow silica nanospheres using polymeric micelles as template and their application as a drug-delivery carrier. Dalton Trans 2013; 42:13381-9. [DOI: 10.1039/c3dt51267c] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Sasidharan M, Nakashima K, Gunawardhana N, Yokoi T, Ito M, Inoue M, Yusa SI, Yoshio M, Tatsumi T. Periodic organosilica hollow nanospheres as anode materials for lithium ion rechargeable batteries. NANOSCALE 2011; 3:4768-4773. [PMID: 22002197 DOI: 10.1039/c1nr10804b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Polymeric micelles with core-shell-corona architecture have been found to be the efficient colloidal templates for synthesis of periodic organosilica hollow nanospheres over a broad pH range from acidic to alkaline media. In alkaline medium, poly (styrene-b-[3-(methacryloylamino)propyl] trimethylammonium chloride-b-ethylene oxide) (PS-PMAPTAC-PEO) micelles yield benzene-silica hollow nanospheres with molecular scale periodicity of benzene groups in the shell domain of hollow particles. Whereas, an acidic medium (pH 4) produces diverse hollow particles with benzene, ethylene, and a mixture of ethylene and dipropyldisulfide bridging functionalities using poly(styrene-b-2-vinyl pyridine-b-ethylene oxide) (PS-PVP-PEO) micelles. These hollow particles were thoroughly characterized by powder X-ray diffraction (XRD), dynamic light scattering (DLS), thermogravimetric analysis (TG/DTA), Fourier transformation infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), magic angle spinning-nuclear magnetic resonance ((29)Si MAS NMR and (13)CP-MAS NMR), Raman spectroscopy, and nitrogen adsorption/desorption analyses. The benzene-silica hollow nanospheres with molecular scale periodicity in the shell domain exhibit higher cycling performance of up to 300 cycles in lithium ion rechargeable batteries compared with micron-sized dense benzene-silica particles.
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Affiliation(s)
- Manickam Sasidharan
- Department of Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga, 840-8502, Japan
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20
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Liu Y, Hu C, Comotti A, Ward MD. Supramolecular Archimedean Cages Assembled with 72 Hydrogen Bonds. Science 2011; 333:436-40. [DOI: 10.1126/science.1204369] [Citation(s) in RCA: 238] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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21
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Electrochemical preparation and photoluminescence of Y1.95Eu0.05O3 hierarchical nanosheets. INORG CHEM COMMUN 2011. [DOI: 10.1016/j.inoche.2011.03.064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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23
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Sasidharan M, Liu D, Gunawardhana N, Yoshio M, Nakashima K. Synthesis, characterization and application for lithium-ion rechargeable batteries of hollow silica nanospheres. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10864f] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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25
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Synthesis of a mesoporous silica hollow microsphere using polyvinyl alcohol. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2008. [DOI: 10.1016/j.msec.2007.11.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Sun J, Bao X. Textural manipulation of mesoporous materials for hosting of metallic nanocatalysts. Chemistry 2008; 14:7478-88. [PMID: 18668502 DOI: 10.1002/chem.200800823] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The preparation and stabilization of nanoparticles are becoming very crucial issues in the field of so-called "nanocatalysis". Recent developments in supramolecular self-assembled porous materials have opened a new way to get nanoparticles hosted in the channels of such materials. In this paper, a new approach towards monodisperse and thermally stable metal nanoparticles by confining them in ordered mesoporous materials is presented, and three aspects are illustrated. Firstly, the recent progress in the functional control of mesoporous materials will be briefly introduced, and the rational tuning of the textures, pore size, and pore length is demonstrated by controlling supramolecular self-assembly behavior. A novel synthesis of short-pore mesoporous materials is emphasized for their easy mass transfer in both biomolecule absorption and the facile assembly of metal nanocomposites within their pore channels. In the second part, the different routes for encapsulating monodisperse nanoparticles inside channels of porous materials are discussed, which mainly includes the ion-exchange/conventional incipient wetness impregnation, in situ encapsulation routes, organometallic methodologies, and surface functionalization schemes. A facile in situ autoreduction route is highlighted to get monodisperse metal nanoparticles with tunable sizes inside the channels of mesoporous silica. Finally, confinement of mesoporous materials is demonstrated to improve the thermal stability of monodisperse metal nanoparticles catalysts and a special emphasis will be focused on the stabilization of the metal nanoparticles with a low Tammann temperature. Several catalytic reactions concerning the catalysis of nanoparticles will be presented. These uniform nanochannels, which confine monodisperse and stable metal nanoparticles catalysts, are of great importance in the exploration of size-dependent catalytic chemistry and further understanding the nature of catalytic reactions.
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Affiliation(s)
- Junming Sun
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, China
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Michaux F, Blin JL, Stébé MJ. Design of ordered bimodal mesoporous silica materials by using a mixed fluorinated-hydrogenated surfactant-based system. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:2138-44. [PMID: 17279706 DOI: 10.1021/la063103p] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Mesoporous silica materials have been prepared using aqueous solutions of hydrogenated-fluorinated surfactant mixtures. The phase behavior of the C18H35(OC2H4)10-C6F15C2H4(OC2H4)11OH [RH18(EO)10-RF6(EO)11] mixture in aqueous solution was first established at the temperature at which the silica source is added, i.e., 20 or 40 degrees C. We have delimited the different phase domains. Concerning the mesostructured silica, whatever the temperature at which the silica source is added, mesoporous material with a hexagonal array of their channel is formed via a cooperative templating mechanism (CTM), if the content of RF6(EO)11 in the surfactant mixture is lower than 50%. Moreover, when the silica source is added at 40 degrees C, the recovered materials exhibit a bimodal pore size distribution. The appearance of this bimodality has been related to the coexistence of hydrogenated micelles with fluorinated wormlike micelles. By contrast, the bimodality is not observed when the silica source is added at 20 degrees C.
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Affiliation(s)
- F Michaux
- Equipe Physico-chimie des Colloïdes, Faculté des Sciences, UMR SRSMC No. 7565, Université Henri Poincaré-Nancy 1/CNRS, BP 239, F-54506 Vandoeuvre-les-Nancy cedex, France
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Wu G, Wang L, Evans DG, Duan X. Layered Double Hydroxides Containing Intercalated Zinc Sulfide Nanoparticles: Synthesis and Characterization. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600203] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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29
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Synthesis, characterization and optical properties of silver and gold nanowires embedded in mesoporous MCM-41. OPEN CHEM 2006. [DOI: 10.2478/s11532-006-0006-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractUniform nanowires of silver and gold inside the channels of MCM-41 were prepared by controlled reduction of their respective metal salts with sodium borohydride (NaBH4). Presence of nanowires of silver and gold in MCM-41 were confirmed by high angle X-ray diffraction (XRD) data (peaks between 2ϑ = 30 − 60°) and transmission electron microscopy (TEM) confirmed the diameter of the nanowires. Diameter of nanowires is found to be ∼ 2.8 nm which is coincident with channel diameter of MCM-41. Optical properties of these heterostructured materials Ag-MCM-41 and Au-MCM-41 reveals the presence of surface plasmon absorption peaks of silver and gold respectively, and the shift in the absorption bands are associated to agglomeration of clusters inside the channels. Room temperature photoluminescence spectra exhibits interesting optical properties as observed for direct band gap semiconductors. Non-linear optical properties (NLO) corresponding to second harmonic generation (SHG) values were also recorded for self supported films of these heterostructured materials. Enhanced optical non-linearity was found to be arising from a corresponding increase of local field near the surface plasmon resonance. Further enhancement in SHG was found with poling due to an induction of orientation order.
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Fan W, Gao L. Synthesis of silica hollow spheres assisted by ultrasound. J Colloid Interface Sci 2006; 297:157-60. [PMID: 16297399 DOI: 10.1016/j.jcis.2005.10.021] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2005] [Revised: 10/10/2005] [Accepted: 10/14/2005] [Indexed: 10/25/2022]
Abstract
A simple and effective method for synthesizing silica hollow spheres is presented. The synthesis utilizes vesicles from oppositely charged surfactants sodium dodecyl sulfate (SDS) and tetrapropylammonium bromide (TPAB) aqueous solution as template for the silica growth. Tetraethyl orthosilicate (TEOS) is added to the vesicular template as a precursor for the silica formation. Ultrasound was employed to accelerate the formation of vesicles template. The morphology of the silica spheres is uniform and well-defined (diameter: 200 nm-5 microm, wall thickness: 50 nm). The product was also characterized by FTIR, TG-DTA, N2 adsorption. TEM images reveal that the spheres have structure stability after calcinations at 550 degrees C.
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Affiliation(s)
- Wugang Fan
- State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding-Xi Road, Shanghai 200050, People's Republic of China
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Hsueh HS, Yang CT, Zink JI, Huang MH. Formation of Titanium Nitride Nanoparticles within Mesoporous Silica SBA-15. J Phys Chem B 2005; 109:4404-9. [PMID: 16851509 DOI: 10.1021/jp045755x] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the first synthesis of titanium nitride (TiN) nanoparticles inside the nanoscale channels of mesoporous silica SBA-15. The TiN precursor, Ti(NMe(2))(4) in toluene, was incorporated into the methyl group-modified channels of the SBA-15 powder. The functionalization of pore surfaces with methyl groups generates hydrophobic surfaces that facilitate impregnation with Ti(NMe(2))(4) and minimizes reactions between the TiN precursor and the hydroxyl groups on the surface of SBA-15. Formation of TiN nanoparticles inside the mesoporous channels of SBA-15 was carried out by subsequent ammonolysis at high temperatures (700-750 degrees C). The final products have been characterized by TEM and EELS images, powder XRD patterns, FTIR spectra, UV-vis absorption spectra, and nitrogen adsorption isotherm measurements to confirm the presence and distribution of TiN nanoparticles in the SBA-15 samples.
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Affiliation(s)
- Han-Sheng Hsueh
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
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32
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Showkat AM, Lee KP, Gopalan AI, Kim MS, Choi SH, Kang HD. A novel self-assembly approach to form tubular poly(diphenylamine) inside the mesoporous silica. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.01.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Lee KP, Showkat AM, Gopalan AI, Kim SH, Choi SH. Synthesis of Poly(diphenylamine) Nanotubes in the Channels of MCM-41 through Self-Assembly. Macromolecules 2004. [DOI: 10.1021/ma048703e] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kwang-Pill Lee
- Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea, Department of Chemistry, Hannam University, 133-Ojung-Dong Dae duck-gu, Daejon 306-791, South Korea, and Department of Industrial Chemistry, Alagappa University, Karaikudi-630003, Tamil Nadu, India
| | - Ali Md Showkat
- Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea, Department of Chemistry, Hannam University, 133-Ojung-Dong Dae duck-gu, Daejon 306-791, South Korea, and Department of Industrial Chemistry, Alagappa University, Karaikudi-630003, Tamil Nadu, India
| | - Anantha Iyengar Gopalan
- Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea, Department of Chemistry, Hannam University, 133-Ojung-Dong Dae duck-gu, Daejon 306-791, South Korea, and Department of Industrial Chemistry, Alagappa University, Karaikudi-630003, Tamil Nadu, India
| | - Sang-Ho Kim
- Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea, Department of Chemistry, Hannam University, 133-Ojung-Dong Dae duck-gu, Daejon 306-791, South Korea, and Department of Industrial Chemistry, Alagappa University, Karaikudi-630003, Tamil Nadu, India
| | - Seong-Ho Choi
- Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea, Department of Chemistry, Hannam University, 133-Ojung-Dong Dae duck-gu, Daejon 306-791, South Korea, and Department of Industrial Chemistry, Alagappa University, Karaikudi-630003, Tamil Nadu, India
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34
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Chae WS, Yoon JH, Yu H, Jang DJ, Kim YR. Ultraviolet Emission of ZnS Nanoparticles Confined within a Functionalized Mesoporous Host. J Phys Chem B 2004. [DOI: 10.1021/jp048349m] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Weon-Sik Chae
- Department of Chemistry, Yonsei University, Seoul, 120-749, and School of Chemistry, Seoul National University, Seoul 151-742, South Korea
| | - Joong-Ho Yoon
- Department of Chemistry, Yonsei University, Seoul, 120-749, and School of Chemistry, Seoul National University, Seoul 151-742, South Korea
| | - Hyunung Yu
- Department of Chemistry, Yonsei University, Seoul, 120-749, and School of Chemistry, Seoul National University, Seoul 151-742, South Korea
| | - Du-Jeon Jang
- Department of Chemistry, Yonsei University, Seoul, 120-749, and School of Chemistry, Seoul National University, Seoul 151-742, South Korea
| | - Yong-Rok Kim
- Department of Chemistry, Yonsei University, Seoul, 120-749, and School of Chemistry, Seoul National University, Seoul 151-742, South Korea
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35
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Zeolites and mesoporous materials as advanced functional material. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s0167-2991(04)80787-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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36
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Brieler FJ, Grundmann P, Fröba M, Chen L, Klar PJ, Heimbrodt W, Krug von Nidda HA, Kurz T, Loidl A. Formation of Zn1-xMnxS Nanowires within Mesoporous Silica of Different Pore Sizes. J Am Chem Soc 2003; 126:797-807. [PMID: 14733554 DOI: 10.1021/ja038960j] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Arrays of highly ordered Zn(1-x)MnxS quantum wires with x ranging from 0.01 to 0.3 and with lateral dimensions of 3, 6, and 9 nm were synthesized within mesoporous SiO2 host structures of the MCM-41 and SBA-15 type. The hexagonal symmetry of these arrays (space group p6m) and the high degree of order was confirmed by X-ray diffraction and transmission electron microscopy (TEM) studies. Physisorption measurements show the progressive filling of the pores of the SiO2 host structures, while TEM and Raman studies reveal the wire-like character of the incorporated Zn(1-x)MnxS nanostructures. X-ray absorption near-edge structure, extended X-ray absorption fine structure, photoluminescence excitation (PLE), and electron paramagnetic resonance studies confirm the good crystalline quality of the incorporated Zn(1-x)MnxS guest species and, in particular, that the Mn2+ ions are randomly distributed and are situated on tetrahedrally coordinated cation sites of the Zn(1-x)MnxS wires for all x up to 0.3. The amount of Mn2+ ions loosely bound to the surface of the Zn(1-x)MnxS nanowires is less than 4% of the total Mn content even for the 3 nm nanostructures up to the highest Mn content of x = 0.3. The effects of the reduction of the lateral dimensions on electronic properties of the diluted magnetic semiconductor were studied by PLE spectroscopy. Due to the quantum confinement of the excitons in the wires an increase of the direct band gap with decreasing particle size is observed.
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Affiliation(s)
- Felix J Brieler
- Institute of Inorganic and Analytical Chemistry, Justus-Liebig University Giessen, Heinrich-Buff-Ring 58, 35392 Giessen, Germany
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37
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Kowalchuk CM, Schmid G, Meyer-Zaika W, Huang Y, Corrigan JF. Preparation, Characterization, and Condensation of Copper Tellurolate Clusters in the Pores of Periodic Mesoporous Silica MCM-41. Inorg Chem 2003; 43:173-80. [PMID: 14704065 DOI: 10.1021/ic0300868] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The copper-tellurolate cluster [(Cu(6)(TePh)(6)(PPh(2)Et)(5)] has been loaded into the pores of MCM-41 by solid-state impregnation techniques. It was found that the best loading conditions are 110 degrees C and 10(-)(3) Torr static vacuum. The resulting material was analyzed by powder X-ray diffraction (PXRD), nitrogen adsorption isotherms, thermogravimetric analysis (TGA), (31)P CP MAS NMR spectroscopy, and TEM. It was observed that loading is accompanied by loss of the phosphine shell, with retention of the copper-tellurium core. Condensation of the impregnated material may proceed thermally or photochemically. Thermal condensation results in the formation of Cu(2)Te nanoparticles as demonstrated by PXRD, and TEM data suggests that the process has taken place inside the pores of MCM-41. Photochemical condensation yields larger metal-chalcogen clusters in the pores as suggested by the result of UV-vis diffuse reflectance spectroscopy and TEM measurements.
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Affiliation(s)
- Collin M Kowalchuk
- Department of Chemistry, The University of Western Ontario, London Ontario, N6A 5B7 Canada
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38
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Wang J, Song H, Sun B, Ren X, Chen B, Xu W. Light-induced luminescent enhancement and structural change in cubic nanocrystallineY2O3:Tb. Chem Phys Lett 2003. [DOI: 10.1016/j.cplett.2003.08.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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39
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Affiliation(s)
- Xiaohu Gao
- Departments of Biomedical Engineering and Chemistry, Emory University and Georgia Institute of Technology, 1639 Pierce Drive, Suite 2001, Atlanta, Georgia 30322
| | - Shuming Nie
- Departments of Biomedical Engineering and Chemistry, Emory University and Georgia Institute of Technology, 1639 Pierce Drive, Suite 2001, Atlanta, Georgia 30322
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40
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Song H, Chen B, Sun B, Zhang J, Lu S. Ultraviolet light-induced spectral change in cubic nanocrystalline Y2O3:Eu3+. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00445-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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41
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Tourné-Péteilh C, Lerner DA, Charnay C, Nicole L, Bégu S, Devoisselle JM. The potential of ordered mesoporous silica for the storage of drugs: the example of a pentapeptide encapsulated in a MSU-tween 80. Chemphyschem 2003; 4:281-6. [PMID: 12674601 DOI: 10.1002/cphc.200390045] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Corine Tourné-Péteilh
- UMR CNRS/ENSCM 5618, Université de Montpellier I, 15 Avenue Ch. Flahault, 34060 Montpellier, France
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Ogawa M. Photoprocesses in mesoporous silicas prepared by a supramolecular templating approach. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2002. [DOI: 10.1016/s1389-5567(02)00023-0] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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43
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Brieler FJ, Fröba M, Chen L, Klar PJ, Heimbrodt W, Von NA, Loidl A. Ordered arrays of II/VI diluted magnetic semiconductor quantum wires: formation within mesoporous MCM-41 silica. Chemistry 2002; 8:185-94. [PMID: 11822450 DOI: 10.1002/1521-3765(20020104)8:1<185::aid-chem185>3.0.co;2-l] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We present a novel way of synthesising highly ordered arrays of hollow Cd(1-x)Mn(x)S quantum wires with lateral dimensions of 3-4 nm separated by 1-2 nm SiO2 barriers by forming Cd(1-x)Mn(x)S (0 < or = x < or = 1) semiconductors inside the pore system of mesoporous MCM-41 SiO2 host structures. X-ray diffraction and transmission electron microscopy (TEM) studies reveal the hexagonal symmetry of these arrays (space group p6m) and confirm the high degree of order. Physisorption measurements show the filling of the pores of the MCM-41 SiO2. The X-ray absorption near-edge structure (XANES), extended X-ray absorption fine structure (EXAFS), electron paramagentic resonance (EPR), and Raman studies confirm the good crystalline quality of the incorporated (Cd,Mn)S guest. The effects of reducing the lateral dimensions on the magnetic and electronic properties of the diluted magnetic semiconductor were studied by photoluminescence (PL) and PL excitation spectroscopy and by SQUID and EPR measurements in the temperature range 2-400 K. Due to the quantum confinement of the excitons in the wires, an increase of about 200 meV in the direct band gap was observed. In addition, the p-d hybridisation-related bowing of the band gap as a function of Mn concentration in the wires is much stronger than in the bulk. This effect is related to the increase in the band gap due to quantum confinement, which shifts the p-like valence band edge closer to the 3d-related states of Mn in the valence band. Thus, the p-d hybridisation and the strength of the band gap bowing are increased. Compared to bulk (II,Mn)VI compounds, antiferromagnetic coupling between the magnetic moments of the Mn2+ ions is weaker. For the samples with high Mn concentrations (x > 0.8) this leads to a suppression of the phase transition of the Mn system from paramagnetic to antiferromagnetic. This effect can be explained by the fact that the lateral dimensions of the wires are smaller than the magnetic length scale of the antiferromagnetic ordering.
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Affiliation(s)
- Felix J Brieler
- Institute of Inorganic and Analytical Chemistry, Justus-Liebig-University Giessen, Germany
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44
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Gedanken A, Tang X, Wang JY, Perkas N, Koltypin Y, Landau MV, Vradman L, Herskowitz M. Using sonochemical methods for the preparation of mesoporous materials and for the deposition of catalysts into the mesopores. Chemistry 2001; 7:4547-52. [PMID: 11757645 DOI: 10.1002/1521-3765(20011105)7:21<4546::aid-chem4546>3.0.co;2-l] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Ultrasound radiation can be used to synthesize a variety of mesporous materials. The reaction time is considerably shorter than the conventional methods. Ultrasonic waves can be further used for the insertion of amorphous nanosized catalysts into the mesopores. A detailed study demonstrates that the nanoparticles are deposited as a monolayer on the inner mesopores walls without blocking them. When the ultrasonically prepared catalyst/mesoporous-subtrate composite is used in catalysis a high conversion into product is obtained.
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Affiliation(s)
- A Gedanken
- Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel.
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45
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Zhang L, Papaefthymiou GC, Ying JY. Synthesis and Properties of γ-Fe2O3 Nanoclusters within Mesoporous Aluminosilicate Matrices. J Phys Chem B 2001. [DOI: 10.1021/jp010174i] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lei Zhang
- Department of Chemical Engineering and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - Georgia C. Papaefthymiou
- Department of Chemical Engineering and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - Jackie Y. Ying
- Department of Chemical Engineering and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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46
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Affiliation(s)
- C Dybowski
- Department of Chemistry and Biochemistry, University of Delaware, Newark 19716-2522, USA
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47
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Gross AF, Ruiz EJ, Tolbert SH. Effect of Framework Polymerization on the Phase Stability of Periodic Silica/Surfactant Nanostructured Composites. J Phys Chem B 2000. [DOI: 10.1021/jp9944379] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adam F. Gross
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569
| | - E. Janette Ruiz
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569
| | - Sarah H. Tolbert
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569
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48
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Control of bandgap of iron oxide through its encapsulation into SiO2-based mesoporous materials. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1381-1169(99)00330-1] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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49
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Miyata H, Kuroda K. Preferred Alignment of Mesochannels in a Mesoporous Silica Film Grown on a Silicon (110) Surface. J Am Chem Soc 1999. [DOI: 10.1021/ja990758m] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hirokatsu Miyata
- Contribution from Canon Inc. R&D Headquarters Canon Research Center, 5-1, Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0193, Japan, Department of Applied Chemistry, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo 169-8555, Japan, and Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, Nishiwaseda-2, Shinjuku-ku, Tokyo 169-0051, Japan
| | - Kazuyuki Kuroda
- Contribution from Canon Inc. R&D Headquarters Canon Research Center, 5-1, Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0193, Japan, Department of Applied Chemistry, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo 169-8555, Japan, and Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, Nishiwaseda-2, Shinjuku-ku, Tokyo 169-0051, Japan
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