1
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Kimura T. Smart synthesis of highly porous metal oxide powders with the self-assembly of amphiphilic organic compounds. Dalton Trans 2024; 53:12434-12441. [PMID: 38922321 DOI: 10.1039/d4dt01427h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
Supramolecular chemistry-mediated synthesis has thus far been employed for the design of ordered mesoporous structures surrounded by various metal oxides that are helpful as nanometer-scaled unique reaction containers with high specific surface area, large pore volume and uniform mesopores useful for the storage and mass transport of large-sized molecules. The evaporation-induced self-assembly (EISA) process is very powerful for fabricating mesoporous metal oxide films with the rapid evaporation of solvents. Although a similar EISA process is also applied to synthesize mesoporous metal oxide powders using the room-temperature drying process with slow evaporation of solvents, the control of the evaporation rate should be quantified for the complete reproduction of high-quality metal oxide powders. In this feature article, I introduce our recent challenge in synthesizing highly porous metal oxides in powder form with the smart optimization of synthetic conditions by combining several EISA processes to eliminate the mismatch of the rate of solvent evaporation, inducing the self-assembly of amphiphilic organic molecules.
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Affiliation(s)
- Tatsuo Kimura
- National Institute of Advanced Industrial Science and Technology (AIST), Sakurazaka, Moriyama-ku, Nagoya 463-8560, Japan.
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2
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Zhang Y, Wakabayashi R, Kimura T. Aerosol-assisted synthesis of titania-based spherical and fibrous materials with a rational design of mesopores using PS- b-PEO. Dalton Trans 2023; 52:1543-1550. [PMID: 36533632 DOI: 10.1039/d2dt03402f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Surfactant-assisted synthesis is a promising technique for the tailor-made design of highly porous metal oxide based nanomaterials. There has been a demand for the comprehensive design of their morphology, porous structure and crystallinity to extend potential applications using metal oxide based materials such as titania (TiO2). However, the porous structure is often deformed and/or destroyed during the process of crystallizing metal oxide frameworks. Herein, the aerosol-assisted synthesis of mesoporous TiO2 powders was conducted in the presence of high-molecular-weight poly(styrene)-block-poly(ethylene oxide) (PS-b-PEO), which improved the stability of the derivative mesoporous structure with an increase in the thickness of the TiO2 frameworks. To propose a rational synthetic route for stable and porous metal oxides, the resultant mesoporous structure and the textural morphology of the mesoporous TiO2 powders were surveyed using PS-b-PEO with different lengths of PS and PEO chains. By a judicious choice of the molecular structure of PS-b-PEO, the morphological design of the fully crystallized anatase phase of TiO2 from spherical to fibrous ones was achieved with control over the mesopore diameter.
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Affiliation(s)
- Yuxiao Zhang
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Sakurazaka, Moriyama-ku, Nagoya 463-8560, Japan.
| | - Ryutaro Wakabayashi
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Sakurazaka, Moriyama-ku, Nagoya 463-8560, Japan.
| | - Tatsuo Kimura
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Sakurazaka, Moriyama-ku, Nagoya 463-8560, Japan.
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3
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Wang R, Venkata Reddy C, Talluri B, Kakarla RR, Zairov RR, Shim J, Aminabhavi TM. Cobalt-doped V 2O 5 hexagonal nanosheets for superior photocatalytic toxic pollutants degradation, Cr (VI) reduction, and photoelectrochemical water oxidation performance. ENVIRONMENTAL RESEARCH 2023; 217:114923. [PMID: 36435491 DOI: 10.1016/j.envres.2022.114923] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 11/11/2022] [Accepted: 11/22/2022] [Indexed: 06/16/2023]
Abstract
The worldwide energy calamity and ecological disturbances demand materials that can remove harmful contaminants from the polluted water. Recently, semiconductor-based catalytic dye removal has created much consideration due to its high efficacy and eco-friendly contaminated water treatment processes. Vanadium oxide (V2O5) has attracted superior attention as a catalyst due to its robust oxidation power, chemical inertness, and stability against photodegradation. In this study, pristine and cobalt (Co)-doped V2O5 samples were synthesized by solvothermal method and examined for their photo-degradation activity and photoelectrochemical (PEC) water oxidation properties. The orthorhombic crystal phase was confirmed by X-ray diffraction (XRD), hexagonal-shaped morphology was observed by scanning electron microscope (SEM) and reduced optical band gap (2.01 eV) was noticed for doped V2O5 catalyst compared to the pristine (2.20 eV) catalyst. The doped V2O5 catalyst exhibited enhanced photodegradation of crystal violet CV (92.7%) and Cr (VI) reduction (90.5%) after 100 min of light irradiation. The doped photocatalyst exhibited approximately 2.1 and 1.9-fold enhancement of photodegradation of CV and Cr(VI) reduction, respectively. The doped electrode showed improved photocurrent density (0.54 mA/cm-2) compared to pristine electrode (0.12 mA/cm-2). Moreover, the doped electrode showed reduced charge-transfer resistance and enhanced charge-transfer properties compared to those of the pristine electrode. Hence, the prepared hexagonal-shaped V2O5 is a suitable material for the elimination of environmental contaminants from the polluted water as well as water splitting for hydrogen generation.
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Affiliation(s)
- Rui Wang
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, 712749, South Korea
| | - Ch Venkata Reddy
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, 712749, South Korea
| | - Bhusankar Talluri
- Department of Metallurgical and Materials Engineering, IIT, Chennai, 600036, India
| | - Raghava Reddy Kakarla
- School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, 2006, Australia.
| | - Rustem R Zairov
- Aleksander Butlerov Institute of Chemistry, Kazan Federal University, Kazan, 420008, 1/29 Lobachevskogo Str., Russia
| | - Jaesool Shim
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, 712749, South Korea.
| | - Tejraj M Aminabhavi
- School of Advanced Sciences, KLE Technological University, Hubballi, 580 031, Karnataka, India; University Center for Research and Development (UCRD), Chandigarh University, Gharuan, Mohali, 140413, Punjab, India.
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4
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Jara Fornerod M, Alvarez-Fernandez A, Williams ER, Skoda MWA, Prieto-Simon B, Voelcker NH, Stefik M, Coppens MO, Guldin S. Enhanced Structural Control of Soft-Templated Mesoporous Inorganic Thin Films by Inert Processing Conditions. ACS APPLIED MATERIALS & INTERFACES 2022; 14:56143-56155. [PMID: 36503231 PMCID: PMC9782354 DOI: 10.1021/acsami.2c18090] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Mesoporous thin films are widely used for applications in need of high surface area and efficient mass and charge transport properties. A well-established fabrication process involves the supramolecular assembly of organic molecules (e.g., block copolymers and surfactants) with inorganic materials obtained by sol-gel chemistry. Typically, subsequent calcination in air removes the organic template and reveals the porous inorganic network. A significant challenge for such coatings is the anisotropic shrinkage due to the volume contraction related to solvent evaporation, inorganic condensation, and template removal, affecting the final porosity as well as pore shape, size, arrangement, and accessibility. Here, we show that a two-step calcination process, composed of high-temperature treatment in argon followed by air calcination, is an effective fabrication strategy to reduce film contraction and enhance structural control of mesoporous thin films. Crucially, the formation of a transient carbonaceous scaffold enables the inorganic matrix to fully condense before template removal. The resulting mesoporous films retain a higher porosity as well as bigger pores with extended porous order. Such films present favorable characteristics for mass transport of large molecules. This is demonstrated for lysozyme adsorption into the mesoporous thin films as an example of enzyme storage.
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Affiliation(s)
| | - Alberto Alvarez-Fernandez
- Department
of Chemical Engineering, University College
London, Torrington Place, London WC1E 7JE, U.K.
| | - Eric R. Williams
- Department
of Chemistry and Biochemistry, University
of South Carolina, Columbia, South Carolina 29208, United States
| | - Maximilian W. A. Skoda
- ISIS
Pulsed Neutron and Muon Source, Rutherford
Appleton Laboratory, Harwell, Oxfordshire OX11 OQX, U.K.
| | - Beatriz Prieto-Simon
- Department
of Electronic Engineering, Universitat Rovira
i Virgili, 43007 Tarragona, Spain
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - Nicolas H. Voelcker
- Monash Institute
of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
- Melbourne
Centre for Nanofabrication, Victorian Node
of the Australian National Fabrication Facility, Clayton, Victoria 3168, Australia
| | - Morgan Stefik
- Department
of Chemistry and Biochemistry, University
of South Carolina, Columbia, South Carolina 29208, United States
| | - Marc-Olivier Coppens
- Department
of Chemical Engineering, University College
London, Torrington Place, London WC1E 7JE, U.K.
- Centre
for Nature Inspired Engineering, University
College London, Torrington
Place, London WC1E 7JE, U.K.
| | - Stefan Guldin
- Department
of Chemical Engineering, University College
London, Torrington Place, London WC1E 7JE, U.K.
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5
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Waite JL, Hunt J, Ji H. Improving Photocatalytic Performance Using Nanopillars and Micropillars. MATERIALS 2021; 14:ma14020299. [PMID: 33430136 PMCID: PMC7827994 DOI: 10.3390/ma14020299] [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: 10/29/2020] [Revised: 12/28/2020] [Accepted: 12/29/2020] [Indexed: 11/17/2022]
Abstract
A recent research emphasis has been placed on the development of highly crystallized nanostructures as a useful technology for many photocatalytic applications. With the unique construction of semiconductor transition metal oxide nanostructures in the form of nanopillars—artificially designed pillar-shaped structures grouped together in lattice-type arrays—the surface area for photocatalytic potential is increased and further enhanced through the introduction of dopants. This short review summarizes the work on improving the efficiency of photocatalyst nanopillars through increased surface area and doping within the applications of water splitting, removal of organic pollutants from the environment, photoswitching, soot oxidation, and photothermalization.
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Affiliation(s)
| | | | - Haifeng Ji
- Correspondence: ; Tel.: +1-215-895-2562; Fax: +1-215-895-1265
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6
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Balu S, Uma K, Pan GT, Yang TCK, Ramaraj SK. Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO₂@α-Fe₂O₃ Nanocomposites Deposited on SnS₂ Flowers. MATERIALS 2018; 11:ma11061030. [PMID: 29914208 PMCID: PMC6025432 DOI: 10.3390/ma11061030] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 06/04/2018] [Accepted: 06/13/2018] [Indexed: 11/16/2022]
Abstract
Semiconductor materials have been shown to have good photocatalytic behavior and can be utilized for the photodegradation of organic pollutants. In this work, three-dimensional flower-like SnS2 (tin sulfide) was synthesized by a facile hydrothermal method. Core-shell structured SiO2@α-Fe2O3 nanocomposites were then deposited on the top of the SnS2 flowers. The as-synthesized nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–Vis Spectroscopy, Brunauer–Emmett–Teller (BET) surface area analysis, and photoluminescence (PL) spectroscopy. The photocatalytic behavior of the SnS2-SiO2@α-Fe2O3 nanocomposites was investigated by observing the degradation of methylene blue (MB). The results show an effective enhancement of photocatalytic activity for the degradation of MB especially for the 15 wt % SiO2@α-Fe2O3 nanocomposites on SnS2 flowers.
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Affiliation(s)
- Sridharan Balu
- Department of Chemical Engineering and biotechnology, National Taipei University of Technology, Taipei 106, Taiwan, (S.B.).
| | - Kasimayan Uma
- Precision Analysis and Research Center, National Taipei University of Technology, Taipei 106, Taiwan.
| | - Guan-Ting Pan
- Department of Chemical Engineering and biotechnology, National Taipei University of Technology, Taipei 106, Taiwan, (S.B.).
| | - Thomas C-K Yang
- Department of Chemical Engineering and biotechnology, National Taipei University of Technology, Taipei 106, Taiwan, (S.B.).
- Precision Analysis and Research Center, National Taipei University of Technology, Taipei 106, Taiwan.
| | - Sayee Kannan Ramaraj
- PG & Research Department of Chemistry, Thiagarajar College, Madurai 625009, Tamilnadu, India.
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7
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Ma Q, Dutta S, Wu KCW, Kimura T. Analytical Understanding of the Materials Design with Well-Described Shrinkages on Multiscale. Chemistry 2018; 24:6886-6904. [DOI: 10.1002/chem.201704198] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Indexed: 01/18/2023]
Affiliation(s)
- Qiang Ma
- National Institute of Advanced Industrial Science and Technology (AIST), Shimoshidami, Moriyama-ku; Nagoya 463-8560 Japan
| | - Saikat Dutta
- Department of Chemical Engineering; National (Taiwan) University; No. 1, Sec. 4, Roosevelt Road Taipei 10617 Taiwan
| | - Kevin C.-W. Wu
- Department of Chemical Engineering; National (Taiwan) University; No. 1, Sec. 4, Roosevelt Road Taipei 10617 Taiwan
| | - Tatsuo Kimura
- National Institute of Advanced Industrial Science and Technology (AIST), Shimoshidami, Moriyama-ku; Nagoya 463-8560 Japan
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8
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Molecular Design of Bisphosphonates To Adjust Their Reactivity toward Metal Sources for the Surfactant-Assisted Synthesis of Mesoporous Films. Angew Chem Int Ed Engl 2017; 56:13459-13463. [DOI: 10.1002/anie.201707225] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Indexed: 11/07/2022]
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9
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Kimura T. Molecular Design of Bisphosphonates To Adjust Their Reactivity toward Metal Sources for the Surfactant-Assisted Synthesis of Mesoporous Films. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707225] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tatsuo Kimura
- Inorganic Functional Materials Research Institute; National Institute of Advanced Industrial Science and Technology (AIST); Shimoshidami, Moriyama-ku Nagoya 463-8560 Japan
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10
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Sasikala R, Karthikeyan K, Easwaramoorthy D, Bilal IM, Rani SK. Photocatalytic degradation of trypan blue and methyl orange azo dyes by cerium loaded CuO nanoparticles. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.enmm.2016.07.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Kimura T. Evaporation-induced Self-assembly Process Controlled for Obtaining Highly Ordered Mesoporous Materials with Demanded Morphologies. CHEM REC 2016; 16:445-57. [PMID: 26806104 DOI: 10.1002/tcr.201500262] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2015] [Indexed: 12/26/2022]
Abstract
A large number of periodic mesoporous materials have been reported using amphiphilic organic molecules with increasing development of synthetic methods for mesostructural, morphological, and compositional designs. The evaporation-induced self-assembly (ESIA) process to fabricate ordered mesoporous films is one of the most essential synthetic methods, which has extensively been applied for obtaining a wide variety of samples (e.g., films and monoliths, including powders). It contains complicated physical variations and chemical reactions, but has been simply explained by several research groups. However, a current, exact understanding of such complicated systems should be given with respect to all the variations and reactions. In this article, I have mainly surveyed the exact EISA process by considering the difference between simple and controlled EISA processes on the basis of my own experiments. I believe that the insights are consequently helpful for obtaining highly ordered mesoporous materials with demanded morphologies.
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Affiliation(s)
- Tatsuo Kimura
- Inorganic Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology (AIST), Shimoshidami Moriyama-ku, Nagoya, 463-8560, Japan
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12
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Yan Z, Chen Q, Xia P, Ma W, Ren B. Strong interactions between Au nanoparticles and TiO2 mesocrystal: highly selective photocatalytic reduction of nitroarenes. NANOTECHNOLOGY 2016; 27:035707. [PMID: 26656241 DOI: 10.1088/0957-4484/27/3/035707] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Au/TiO2 mesocrystals (Au/TMCs) were synthesized via a template-free solvothermal approach, followed with in situ photoreduction of gold chloride tetrahydrate for deposition of Au nanoparticles (AuNPs). The microstructure and components of the photocatalysts were characterized with various techniques. The results indicated that the AuNPs selectively anchored on the (101) facet of TiO2 mesocrystals (TMCs). More interestingly, the strong interactions occurred between AuNP and TMC support, due to the formation of a close Schottky heterointerface, combined with Ti-O-Au chemical bonds partially formed. Unexpectedly, it was found that the AuNPs typically aligned with their [111] direction, parallelling to the [101] direction of TMC in many cases. Au/TMCs exhibited high selectivity and activity for the transformation of nitroarenes to corresponding azoxyarenes, which could be attributed to not only the plasmonic effect of AuNPs and the unique superstructure of TMC, but also the highly strong interaction between AuNPs and TMCs through the close Schottky heterointerface.
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Affiliation(s)
- Ziran Yan
- Advanced building materials Engineering Research Centre, the Ministry of Education, Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, 336 Nanxinzhuang West Rd, Jinan, Shandong 250022, People's Republic of China
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13
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Samsudin EM, Hamid SBA, Juan JC, Basirun WJ. Influence of triblock copolymer (pluronic F127) on enhancing the physico-chemical properties and photocatalytic response of mesoporous TiO 2. APPLIED SURFACE SCIENCE 2015; 355:959-968. [DOI: 10.1016/j.apsusc.2015.07.178] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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14
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Wang B, Zhang M, Li W, Wang L, Zheng J, Gan W, Xu J. Fabrication of Au(Ag)/AgCl/Fe3O4@PDA@Au nanocomposites with enhanced visible-light-driven photocatalytic activity. Dalton Trans 2015; 44:17020-5. [DOI: 10.1039/c5dt02599k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A novel Au(Ag)/AgCl/Fe3O4@Pdop@Au multifunctional nanotube was obtained, which showed obvious near-infrared absorption and exhibited excellent photocatalytic via visible light.
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Affiliation(s)
- Baoyu Wang
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Min Zhang
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Weizhen Li
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Linlin Wang
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Jing Zheng
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Wenjun Gan
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Jingli Xu
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
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15
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Dendooven J, Devloo-Casier K, Ide M, Grandfield K, Kurttepeli M, Ludwig KF, Bals S, Van Der Voort P, Detavernier C. Atomic layer deposition-based tuning of the pore size in mesoporous thin films studied by in situ grazing incidence small angle X-ray scattering. NANOSCALE 2014; 6:14991-14998. [PMID: 25363826 DOI: 10.1039/c4nr05049e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Atomic layer deposition (ALD) enables the conformal coating of porous materials, making the technique suitable for pore size tuning at the atomic level, e.g., for applications in catalysis, gas separation and sensing. It is, however, not straightforward to obtain information about the conformality of ALD coatings deposited in pores with diameters in the low mesoporous regime (<10 nm). In this work, it is demonstrated that in situ synchrotron based grazing incidence small angle X-ray scattering (GISAXS) can provide valuable information on the change in density and internal surface area during ALD of TiO(2) in a porous titania film with small mesopores (3-8 nm). The results are shown to be in good agreement with in situ X-ray fluorescence data representing the evolution of the amount of Ti atoms deposited in the porous film. Analysis of both datasets indicates that the minimum pore diameter that can be achieved by ALD is determined by the size of the Ti-precursor molecule.
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Affiliation(s)
- Jolien Dendooven
- Department of Solid State Sciences, COCOON, Ghent University, Krijgslaan 281/S1, B-9000 Ghent, Belgium.
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16
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Wang W, Dong L, Wang J, Shi X, Han S. Characterization and photocatalytic activity of mesoporous TiO2 prepared from an ethanol–diethyl ether binary solvent system. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Subash B, Krishnakumar B, Swaminathan M, Shanthi M. ZnS–Ag–ZnO as an Excellent UV-Light-Active Photocatalyst for the Degradation of AV 7, AB 1, RR 120, and RY 84 Dyes: Synthesis, Characterization, and Catalytic Applications. Ind Eng Chem Res 2014. [DOI: 10.1021/ie5018145] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B. Subash
- Photocatalysis Laboratory,
Department of Chemistry, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India
| | - B. Krishnakumar
- Photocatalysis Laboratory,
Department of Chemistry, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India
| | - M. Swaminathan
- Photocatalysis Laboratory,
Department of Chemistry, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India
| | - M. Shanthi
- Photocatalysis Laboratory,
Department of Chemistry, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India
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18
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Ren L, Li Y, Hou J, Zhao X, Pan C. Preparation and enhanced photocatalytic activity of TiO₂ nanocrystals with internal pores. ACS APPLIED MATERIALS & INTERFACES 2014; 6:1608-15. [PMID: 24428212 DOI: 10.1021/am404457u] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Anatase TiO2 nanocrystals with internal pores are prepared by a novel facile microwave-assisted hydrolysis of a mixture of TiOCl2 and HF aqueous solutions, followed by calcination at 400 °C. The TiO2 nanocrystals with internal pores are characterized by XRD, TEM, SEM, BET, EDS, and XPS. The formation mechanism of the TiO2 nanocrystals with internal pores is discussed by investigating the role of fluorine and the calcination. The photocatalytic measurement shows that the TiO2 nanocrystals with internal pores exhibit much higher photocatalytic activity for the photodegradation of crystal violet, methyl orange, and 4-chlorophenol than the TiO2 solid nanocrystals. The photocatalytic enhancement is due to the fluorination of TiO2 nanocrystals as well as its unique hollow nanostructure, which results in the higher separation efficiency of photogenerated electrons and holes in the TiO2 nanocrystals with internal pores than in its solid counterpart.
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Affiliation(s)
- Lu Ren
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology , 122 Luoshi Road, Wuhan 430070, P.R. China
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19
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Bastakoti BP, Ishihara S, Leo SY, Ariga K, Wu KCW, Yamauchi Y. Polymeric micelle assembly for preparation of large-sized mesoporous metal oxides with various compositions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:651-659. [PMID: 24392806 DOI: 10.1021/la403901x] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Here we report the synthesis of mesoporous metal oxide materials with various compositions by assembly of spherical polymeric micelles consisting of triblock copolymer poly(styrene-b-2-vinyl pyridine-b-ethylene oxide) (PS-b-PVP-b-PEO) with three chemically distinct units. The PVP block interacts strongly with the inorganic precursors for the target compositions. The hydrophobic PS block is kinetically frozen in the precursor solutions, enabling the spherical micelles to remain in a stable form. The frozen PS cores serve as templates for preparing robust mesoporous materials. The PEO corona helps the micelles to stay well dispersed in the precursor solutions, which plays a key role in the orderly arrangement of the micelles during solvent evaporation. This approach is based on assembly of the stable micelles using a simple, highly reproducible method and is widely applicable toward numerous compositions that are difficult for the formation of mesoporous structures.
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Affiliation(s)
- Bishnu Prasad Bastakoti
- World Premier International (WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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20
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Kataoka S, Takeuchi Y, Kawai A, Yamada M, Kamimura Y, Endo A. Controlled formation of silica structures using siloxane/block copolymer complexes prepared in various solvent mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13562-13567. [PMID: 24093890 DOI: 10.1021/la403168v] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Block copolymers exhibit regularly patterned structures induced by microphase separation. Here we present a method for preparing various particulate silica (SiO2) nanostructures by controlling the microphase separation of block copolymers. In this method, siloxane, a SiO2 precursor, is adsorbed onto poly(4-vinylpyridine) blocks of polystyrene-block-poly(4-vinylpyridine) in solvent mixtures. After siloxane/polymer complexes are coprecipitated via further siloxane polycondensation, the resulting precipitates are heated to remove the polymer. The results of scanning electron microscopy revealed that SiO2 formed various structures including cylindrical, spherical, and lamellar. Different SiO2 nanostructures formed via the microphase separation of siloxane/polymer complexes are prepared simply by varying solvent mixtures without changing the polymer chain. The structural change is interpreted in terms of polymer-solvent interactions and volume fractions in siloxane/polymer complexes.
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Affiliation(s)
- Sho Kataoka
- National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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Jiang X, Suzuki N, Bastakoti BP, Chen WJ, Huang YT, Yamauchi Y. Controlled Synthesis of Well-Ordered Mesoporous Titania Films with Large Mesopores Templated by Spherical PS-b-PEO Micelles. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300221] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Zakaria MB, Suzuki N, Torad NL, Matsuura M, Maekawa K, Tanabe H, Yamauchi Y. Preparation of Mesoporous Titania Thin Films with Well-Crystallized Frameworks by Using Thermally Stable Triblock Copolymers. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201305] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Pinho L, Hernández-Garrido JC, Calvino JJ, Mosquera MJ. 2D and 3D characterization of a surfactant-synthesized TiO2–SiO2 mesoporous photocatalyst obtained at ambient temperature. Phys Chem Chem Phys 2013; 15:2800-8. [DOI: 10.1039/c2cp42606d] [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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Kimura T. Macroporous Oxide Platforms Templated by Non-Close-Packed Spherical Copolymer Aggregates. Macromol Rapid Commun 2012; 34:423-30. [DOI: 10.1002/marc.201200765] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Indexed: 11/07/2022]
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Chandra D, Ohji T, Kato K, Kimura T. Ligand-assisted fabrication of small mesopores in semi-crystalline titanium oxide films for high loading of Ru(II) dyes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11436-11443. [PMID: 21766874 DOI: 10.1021/la2013123] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Small mesoporous (2-3 nm) and optically uniform titania films with high surface areas were fabricated by employing the ligand-assisted templating approach using designed surfactants that contain strong N-donor sites around the hydrophilic headgroup. Two N atoms, located in a pyridine ring and in the attached alkyl chain, can strongly interact with one Ti atom via covalent ligation and reduce the reactivity (hydrolysis and condensation) of soluble Ti species. The as-made films were treated with UV-ozone irradiation, before calcination to crystallize the titania frameworks. Condensation of the titania frameworks proceeded during the UV-ozone treatment that also destroyed the binding sites between the designed surfactants and Ti atoms with partial decomposition of the surfactants. The titania surfaces were then covered with resultant charred organic species and stabilized, which was helpful for the retention of the mesostructures even after partial crystallization of the titania frameworks during calcination at 400 °C. The small mesopores were more useful for effective accommodation of Ru(II) bipyridyl dyes (∼1 nm) than were common mesopores (∼10 nm). Almost 2 times higher dye loadings were achieved over the small mesoporous titania films than other porous titania films due to the high surface areas, and consequently a high density of the photosensitive dye molecules was achieved even in the thin film fabricated in one pot.
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Affiliation(s)
- Debraj Chandra
- Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Shimoshidami, Nagoya 463-8560, Japan
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