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Souissi FZ, Hajji M, Ettoumi H, Barre M, Benkhalifa J, Guerfel T. Synthesis, Thermal Properties and Electrical Conductivity of Na-Sialate Geopolymer. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02337-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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2
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Minaei S, Abdollahifar M, Shojaeimehr T, Kumar D. Micro/mesoporous quasi-zero-dimensional AlOOH and Al2O3 nanoparticles. INORG NANO-MET CHEM 2019. [DOI: 10.1080/24701556.2019.1703000] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Shahab Minaei
- Department of Chemical Engineering, College of Science, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
- Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, Canada
| | - Mozaffar Abdollahifar
- Department of Chemical Engineering, College of Science, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - Tahereh Shojaeimehr
- Department of Chemical Engineering, College of Science, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
| | - Dalip Kumar
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
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3
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Menon SG, Choudhari KS, Shivashankar SA, Chidangil S, Kulkarni SD. Microwave solution route to ceramic ZnAl2O4 nanoparticles in 10 minutes: inversion and photophysical changes with thermal history. NEW J CHEM 2017. [DOI: 10.1039/c7nj01006k] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Within 10 minutes microwave synthesis using metal complexes can form crystalline ZnAl2O4 nanoparticles with significant inversion.
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Affiliation(s)
- Samvit G. Menon
- Department of Atomic and Molecular Physics
- Manipal University
- Manipal
- India
| | | | | | - Santhosh Chidangil
- Department of Atomic and Molecular Physics
- Manipal University
- Manipal
- India
| | - Suresh D. Kulkarni
- Department of Atomic and Molecular Physics
- Manipal University
- Manipal
- India
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4
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Chen X, Li H, Qi Z, Yang T, Yang Y, Hu X, Zhang X, Zhu X, Zhuang X, Hu W, Pan A. Synthesis and optoelectronic properties of quaternary GaInAsSb alloy nanosheets. NANOTECHNOLOGY 2016; 27:505602. [PMID: 27855125 DOI: 10.1088/0957-4484/27/50/505602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Quasi-one-dimensional (1D) nanostructures have been extensively explored for electronic and optoelectronic devices on account of their unique morphologies and versatile physical properties. Here, we report the successful synthesis of GaInAsSb alloy nanosheets by a simple chemical vapor deposition method. The grown GaInAsSb alloy nanosheets are pure zinc-blende single crystals, which show nanosize-induced extraordinary optoelectronic properties as compared with bulk materials. μ-Raman spectra exhibit a multi-mode phonon vibration behavior with clear frequency shifts under varied laser power. Photoluminescence measurements reveal a strong light emission in the near-infrared region (1985 nm), and the obtained Varshni thermal coefficients α and β are smaller than those of the bulk counterparts due to the size confinement effect. In addition, photodetectors (PDs) based on these single-alloy nanosheets were constructed for the first time. The PDs show a strong response in the near-infrared region with the external quantum efficiency of 8.05 × 104%, and the responsivity of 0.675 × 103 A W-1. These novel nanostructures would make contributions to the study of fundamental physical phenomena in quasi-1D nanomaterial systems and can be potential building blocks for optoelectronic and quantum devices.
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Affiliation(s)
- Xinliang Chen
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronic Science, and State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People's Republic of China
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5
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Wang S, Huang Q, Wu Y, Huang H. Unique structure and surface-related elastic modulus of alumina nanobelts. NANOTECHNOLOGY 2016; 27:475701. [PMID: 27767017 DOI: 10.1088/0957-4484/27/47/475701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Single-crystalline α-Al2O3 nanobelts were synthesized by high-temperature chemical vapor deposition in a high-purity H2 atmosphere. The crystalline planes for the upper and side surfaces of the nanobelts were [Formula: see text] and [Formula: see text] and the orientations along height, length and width directions were [Formula: see text] [Formula: see text] and [Formula: see text] respectively. The formation of such a unique structure was dependent on the strong reducing atmosphere used in the growth process, and the deactivation of the [Formula: see text] plane by hydrogen could be the primary cause. The elastic modulus of the nanobelts was measured using a thermal resonance method. The moduli for the nanobelts were about 320 GPa for thicknesses above 40 nm, and slightly increased to 356 GPa as the thickness decreased to 31 nm. The slightly low modulus values compared to the theoretical value of 371 GPa is attributed to oxygen vacancies within the nanobelts, while the increase in modulus with decreased thickness comes from the stiffening effect caused by surface relaxation.
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Affiliation(s)
- Shiliang Wang
- School of Mechanical and Mining Engineering, the University of Queensland, Brisbane, QLD 4072 Australia. School of Physics and Electronics, Central South University, Changsha, 410083, People's Republic of China
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6
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Chen YH, Huang CW, Yeh PH, Chen JY, Lin TY, Chang CF, Wu WW. A solid-state cation exchange reaction to form multiple metal oxide heterostructure nanowires. NANOSCALE 2016; 8:17039-17043. [PMID: 27714036 DOI: 10.1039/c6nr01287f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Metal oxide nanostructures have been investigated extensively due to their wide range of physical properties; zinc oxide is one of the most promising materials. It exhibits fascinating functional properties and various types of morphologies. In particular, ZnO heterostructures have attracted great attention because their performance can be modified and further improved by the addition of other materials. In this study, we successfully transformed ZnO nanowires (NWs) into multiple ZnO/Al2O3 heterostructure NWs via a solid-state cation exchange reaction. The experiment was carried out in situ via an ultrahigh vacuum transmission electron microscope (UHV-TEM), which was equipped with a video recorder. Moreover, we analyzed the structure and composition of the heterostructure NWs by Cs-corrected STEM equipped with EDS. Based on these experimental results, we inferred a cation exchange reaction ion path model. Additionally, we investigated the defects that appeared after the cation reaction, which resulted from the remaining zinc ions. These multiple heterostructure ZnO/Al2O3 NWs exhibited excellent UV sensing sensitivity and efficiency.
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Affiliation(s)
- Y H Chen
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - C W Huang
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - P H Yeh
- Department of Physics, Tam Kang University, New Taipei 251, Taiwan
| | - J Y Chen
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - T Y Lin
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - C F Chang
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - W W Wu
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
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7
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Li Y, Wu Z, Zhao F, Gong X. Facile template-free fabrication of novel flower-like γ-Al2O3nanostructures and their enhanced Pb(ii) removal application in water. CrystEngComm 2016. [DOI: 10.1039/c6ce00446f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Gangwar J, Gupta BK, Kumar P, Tripathi SK, Srivastava AK. Time-resolved and photoluminescence spectroscopy of θ-Al₂O₃ nanowires for promising fast optical sensor applications. Dalton Trans 2015; 43:17034-43. [PMID: 25300301 DOI: 10.1039/c4dt01831a] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Herein, we have demonstrated the high yield facile growth of Al2O3 nanowires of uniform morphology with different polymorph phases (e.g. γ, δ and θ) via a hydrothermal method with varying calcination temperatures. The synthesized θ-Al2O3 nanowires were well characterized by XRD, FTIR, SEM/EDAX, AFM and HRTEM techniques. Microstructural analysis confirmed that the dimensions of the individual θ-Al2O3 nanowires are approximately in the ranges 5-20 nm in width and 40-150 nm in length, and the aspect ratio is up to 20. AFM results evidenced the uniform distribution of the nanowires with controlled morphology. Furthermore, UV-vis spectroscopic data reveal that the estimated optical band gap of the θ-Al2O3 nanowires was ~5.16 eV. The photoluminescence spectrum exhibits blue emission upon excitation at a wavelength of 252 nm. Time-resolved spectroscopy demonstrates that these nanowires illustrate a decay time of ~2.23 nanoseconds. The obtained photoluminescence results with a decay time of nanoseconds suggest that the θ-Al2O3 phase could be an exceptional choice for next generation fast optical sensors.
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Affiliation(s)
- Jitendra Gangwar
- National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S. Krishnan Road, New Delhi, 110012, India
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9
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Hou L, Wang S, Huang H. A simple criterion for determining the static friction force between nanowires and flat substrates using the most-bent-state method. NANOTECHNOLOGY 2015; 26:165702. [PMID: 25815772 DOI: 10.1088/0957-4484/26/16/165702] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A simple criterion was developed to assess the appropriateness of the currently available models that estimate the static friction force between nanowires and substrates using the 'most-bent-state' method. Our experimental testing of the static friction force between Al2O3 nanowires and Si substrate verified our theoretical analysis, as well as the establishment of the criterion. It was found that the models are valid only for the bent nanowires with the ratio of wire length over the minimum curvature radius [Formula: see text] no greater than 1. For the cases with [Formula: see text] greater than 1, the static friction force was overestimated as it neglected the effect of its tangential component.
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Affiliation(s)
- Lizhen Hou
- State Key Laboratory for Powder Metallurgy, School of Physics and Electronics, Central South University, Changsha, 410083, People's Republic of China. School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
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10
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Song X, Yang P, Jia C, Chen L, Matras-Postolek K. Self-assembled synthesis of urchin-like AlOOH microspheres with large surface area for removal of pollutants. RSC Adv 2015. [DOI: 10.1039/c5ra01255d] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Urchin-like AlOOH microspheres synthesized by a chemical induced solvothermal method revealed high efficiency for the removal of Congo red pollutant.
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Affiliation(s)
- Xueling Song
- School of Material Science and Engineering
- University of Jinan
- Jinan
- PR China
| | - Ping Yang
- School of Material Science and Engineering
- University of Jinan
- Jinan
- PR China
| | - Changchao Jia
- School of Material Science and Engineering
- University of Jinan
- Jinan
- PR China
| | - Ling Chen
- School of Material Science and Engineering
- University of Jinan
- Jinan
- PR China
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11
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Kool A, Thakur P, Bagchi B, Hoque NA, Banerjee S, Das S. Sol–gel synthesis of transition-metal ion conjugated alumina-rich mullite nanocomposites with potential mechanical, dielectric and photoluminescence properties. RSC Adv 2015. [DOI: 10.1039/c5ra21091g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Mechanical, dielectric and photoluminescence properties of transition-metal ions doped mullite nanocomposite synthesized via alkoxide hydrolysis.
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Affiliation(s)
- Arpan Kool
- Department of Physics
- Jadavpur University
- Kolkata-700032
- India
| | - Pradip Thakur
- Department of Physics
- Jadavpur University
- Kolkata-700032
- India
- Department of Physics
| | - Biswajoy Bagchi
- Fuel Cell and Battery Division
- Central Glass and Ceramic Research Institute
- Kolkata-700032
- India
| | - Nur Amin Hoque
- Department of Physics
- Jadavpur University
- Kolkata-700032
- India
| | | | - Sukhen Das
- Department of Physics
- Jadavpur University
- Kolkata-700032
- India
- Department of Physics
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Díaz de León J, Zepeda T, Alonso-Nuñez G, Galván D, Pawelec B, Fuentes S. Insight of 1D γ-Al2O3 nanorods decoration by NiWS nanoslabs in ultra-deep hydrodesulfurization catalyst. J Catal 2015. [DOI: 10.1016/j.jcat.2014.11.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Liu H, Choy KL, Roe M. Enhanced conductivity of reduced graphene oxide decorated with aluminium oxide nanoparticles by oxygen annealing. NANOSCALE 2013; 5:5725-5731. [PMID: 23712529 DOI: 10.1039/c3nr00362k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A process involving the filtration of graphene oxide (GO) dispersion through an alumina membrane, followed by oxygen annealing to synthesize alumina nanoparticles exclusively at the edges of holes or vacancies in the reduced graphene oxide (rGO) plane, is used to prepare paper-like composites with a 21% enhanced electrical conductivity. Moreover, the rGO/alumina nanocomposites have a smaller band gap and hydrophilic properties.
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Affiliation(s)
- Hao Liu
- Faculty of Engineering, Energy and Sustainability Research Division, University of Nottingham, University Park, Nottingham, UK
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14
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Song J, Li Z, Xu X, He M, Li Z, Wang Q, Yan L. Organic-free Synthesis of Boehmite Nanofibers by Al2(SO4)3·18H2O with High Pore Volume. Ind Eng Chem Res 2013. [DOI: 10.1021/ie400627y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Jiaqing Song
- State Key Laboratory of Chemical
Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Zhenhu Li
- State Key Laboratory of Chemical
Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Xiangyu Xu
- State Key Laboratory of Chemical
Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Mingyuan He
- Shanghai Key Laboratory of Green
Chemistry and Chemical Processes, East China Normal University, Shanghai, 200241, China
| | - Zhaofei Li
- Petrochemical Research Institute of Petrochina, Beijing, 100195, China
| | - Qian Wang
- Petrochemical Research Institute of Petrochina, Beijing, 100195, China
| | - Lijun Yan
- Petrochemical Research Institute of Petrochina, Beijing, 100195, China
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15
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Synthesis of flower-like Boehmite (γ-AlOOH) via a one-step ionic liquid-assisted hydrothermal route. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.03.049] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Preparation of novel alumina nanowire solid-phase microextraction fiber coating for ultra-selective determination of volatile esters and alcohols from complicated food samples. J Chromatogr A 2013; 1290:27-35. [DOI: 10.1016/j.chroma.2013.03.052] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Revised: 03/18/2013] [Accepted: 03/19/2013] [Indexed: 11/21/2022]
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17
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Wang Z, Li C, Liu L, Sham TK. Probing defect emissions in bulk, micro- and nano-sized α-Al2O3 via X-ray excited optical luminescence. J Chem Phys 2013; 138:084706. [PMID: 23464171 DOI: 10.1063/1.4793473] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The electronic structure and optical properties of bulk, micro-sized, and nano-sized α-Al2O3 (wafer, microparticles (MPs), nanowires (NWs), and nanotubes (NTs)) have been investigated using X-ray absorption near-edge structures (XANES) and X-ray excited optical luminescence (XEOL). XANES results show that the wafer, MPs, and NTs have characteristic features of α-Al2O3. The NWs have a core∕shell structure with a single crystalline α-Al2O3 core surrounded by an amorphous shell, which is consistent with transmission electron microscopy result. It is found that some Al(3+) in the shell and core∕shell interface of the NWs as well as the surface of the NTs were reduced to Al(2+) or Al(1+) during the growth process. XEOL results show that the wafer and MPs have a broad emission at 325 nm and a sharp emission at 694 nm, which are attributed to F(+) center and Cr(3+) impurities, respectively. The NWs exhibit an intense emission at 404 nm that comes from F center, while the NTs show relatively weak luminescence at 325, 433, and 694 nm, which are attributed to F(+) center, F center, and Cr(3+) impurities, respectively. The O K-edge XEOL confirms that the emissions of α-Al2O3 in the range of 250-550 nm are related to the oxygen site. Furthermore, on the basis of XEOL and photoluminescence yield, the strong luminescence of the NWs (404 nm) is related to the Al(2+) or Al(1+) in the shell and core∕shell interface, while the luminescence of the NTs at 325 and 433 nm are related to the bulk and the Al(2+) or Al(1+) on the surface, respectively.
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Affiliation(s)
- Zhiqiang Wang
- Department of Chemistry, The University of Western Ontario, Chemistry Building, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
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18
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Al-Mamun SA, Nakajima R, Ishigaki T. Tuning the size of aluminum oxide nanoparticles synthesized by laser ablation in water using physical and chemical approaches. J Colloid Interface Sci 2012. [PMID: 23177203 DOI: 10.1016/j.jcis.2012.10.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Colloidal solution of nano-sized spherical Al(2)O(3) particles were produced by nanosecond laser ablation upon irradiation on a corundum target in a distilled water environment. The effects of target inclination along the direction of laser irradiation and defocusing of the laser beam have been investigated in this study. The effect of the pH of the aqueous solution has also been studied. Synthesized particles were analyzed using transmission electron microscopy (TEM) to investigate particle shape and size distributions. Ablated nanoparticles (NPs) were spherical in shape, with the average particle size ranging from 8 to 18 nm in different operating conditions. Target inclination resulted in a decrease in the average particle size. Laser defocusing at the same power and thus with reduced fluence caused a decrease in the average size and standard deviation (SD), whereas defocusing that maintained the same fluence caused the reverse effect. Phase identification of NPs performed with high resolution TEM lattice images and fast Fourier transform indicated both a metastable γ-Al(2)O(3) phase and a stable α-Al(2)O(3) phase. X-ray diffraction analysis was also performed, which showed peaks of both α-Al(2)O(3) and γ-Al(2)O(3) with the presence of α- and γ-AlO(OH) polymorphs in acidic and alkaline solution, respectively. Surface conditions of the ablated particles representing the acidic and alkaline conditions were found to have a significant influence on both the size and crystallographic phase, which indicates it may be possible to induce size and phase transitions by changing the surface chemistry.
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Affiliation(s)
- Sharif Abdullah Al-Mamun
- Research Center for Micro-Nano Technology, Hosei University, 3-11-15 Midori-cho, Koganei, Tokyo 184-0003, Japan
| | - Reiko Nakajima
- Department of Materials Chemistry, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan
| | - Takamasa Ishigaki
- Research Center for Micro-Nano Technology, Hosei University, 3-11-15 Midori-cho, Koganei, Tokyo 184-0003, Japan; Department of Materials Chemistry, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan; Department of Chemical Science and Technology, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan.
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Huang CW, Hsin CL, Wang CW, Chu FH, Kao CY, Chen JY, Huang YT, Lu KC, Wu WW, Chen LJ. Direct observation of melting behaviors at the nanoscale under electron beam and heat to form hollow nanostructures. NANOSCALE 2012; 4:4702-4706. [PMID: 22744608 DOI: 10.1039/c2nr30724c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report the melting behaviours of ZnO nanowire by heating ZnO-Al(2)O(3) core-shell heterostructures to form Al(2)O(3) nanotubes in an in situ ultrahigh vacuum transmission electron microscope (UHV-TEM). When the ZnO-Al(2)O(3) core-shell nanowire heterostructures were annealed at 600 °C under electron irradiation, the amorphous Al(2)O(3) shell became single crystalline and then the ZnO core melted. The average vanishing rate of the ZnO core was measured to be 4.2 nm s(-1). The thickness of the Al(2)O(3) nanotubes can be precisely controlled by the deposition process. Additionally, the inner geometry of nanotubes can be defined by the initial ZnO core. The result shows a promising method to obtain the biocompatible Al(2)O(3) nanotubes, which may be applied in drug delivery, biochemistry and resistive switching random access memory (ReRAM).
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Affiliation(s)
- Chun-Wei Huang
- Department of Materials Science and Engineering, National Chiao Tung University, No.1001, University Rd., East Dist., Hsinchu City 300, Taiwan
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20
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Chang CC, Wu JL, Yang NH, Lin SJ, Chang SY. Synthesis and growth twinning of γ-Al2O3nanowires by simple evaporation of Al–Si alloy powder. CrystEngComm 2012. [DOI: 10.1039/c1ce05758h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Fouad OA, Khder AERS, Dai Q, El-Shall MS. Structural and catalytic properties of ZnO and Al2O3 nanostructures loaded with metal nanoparticles. JOURNAL OF NANOPARTICLE RESEARCH 2011; 13:7075-7083. [DOI: 10.1007/s11051-011-0620-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Xu B, Wang J, Yu H, Gao H. Large-scale synthesis of hierarchical flowerlike boehmite architectures. J Environ Sci (China) 2011; 23 Suppl:S49-S52. [PMID: 25084593 DOI: 10.1016/s1001-0742(11)61076-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Three-dimensional flowerlike boehmite architectures were synthesized on a large scale via a surfactant-assisted hydrothermal method. The XRD pattern showed that the AlOOH was fully crystallized and exhibited an orthorhombic phase. SEM and TEM images indicated that the flowerlike AlOOH architectures, consisting of nanosheets of 50 nm in thickness, were 550-800 nm in diameters and 1 μm in lengths. SAED pattern revealed that the flowerlike AlOOH was polycrystalline. Nitrogen adsorption/desorption measurement indicated that hierarchical AlOOH architectures had Brunauer-Emmett-Teller (BET) surface area of about 70.1 m(2)/g. The effects of reaction times and the surfactant on the morphologies were also investigated. It was found that CTAB played a crucial role. The formation mechanism of the flowerlike AlOOH architectures was proposed and discussed based on the experimental results.
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Affiliation(s)
- Bing Xu
- Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders, Dalian Jiaotong University, Dalian 116028, China
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23
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Nagai N, Mizukami F. Properties of boehmite and Al2O3 thin films prepared from boehmite nanofibres. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11571e] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Liang H, Liu L, Yang H, Wei J, Yang Z, Yang Y. Controllable synthesis of γ-AlOOH micro/nanoarchitectures via a one-step solution route. CrystEngComm 2011. [DOI: 10.1039/c0ce00594k] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Min BK, Kim YK, Lee SW, Jung WS. Formation of Cube-shaped α-Al 2O 3Microstructures by the Reaction of Carbon Monoxide with Aluminum Sulfide. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.12.3864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Gu Z, Liu F, Howe JY, Parans Paranthaman M, Pan Z. Germanium-catalyzed hierarchical Al(2)O(3) and SiO(2) nanowire bunch arrays. NANOSCALE 2009; 1:347-354. [PMID: 20648272 DOI: 10.1039/b9nr00040b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Germanium (Ge), a Group IV semiconductor, was recently used as an effective catalyst to grow individual, single-crystalline ZnO nanowires through a vapor-liquid-solid (VLS) process [Pan et al., Angew. Chem., Int. Ed., 2005, 44, 274-278]. Here, we show that Ge can also act as an efficient catalyst for the large-scale growth of highly aligned, closely-packed polycrystalline Al(2)O(3) and amorphous SiO(2) nanowire bunch arrays. The Ge-catalyzed Al(2)O(3) and SiO(2) nanowire growth exhibits many interesting growth behaviors including (i) multiple nanowire growth catalyzed by one micrometer-size Ge particle, (ii) branching growth and (iii) batch-by-batch growth. These growth phenomena are distinct from the conventional Au-catalyzed nanowire growth but are analogous to the recently reported Ga-catalyzed SiO(2) nanowire growth. It is anticipated that many other oxide nanowires and nanowire assemblies can be synthesized through the Ge-catalyzed VLS process. The Ge-catalyzed Al(2)O(3) and SiO(2) nanowires emit strong visible light under ultraviolet light excitation.
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Affiliation(s)
- Zhanjun Gu
- University of Georgia, Athens, 30602, USA
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Lu CL, Lv JG, Xu L, Guo XF, Hou WH, Hu Y, Huang H. Crystalline nanotubes of gamma-AlOOH and gamma-Al2O3: hydrothermal synthesis, formation mechanism and catalytic performance. NANOTECHNOLOGY 2009; 20:215604. [PMID: 19423935 DOI: 10.1088/0957-4484/20/21/215604] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Crystalline nanotubes of gamma-AlOOH and gamma-Al(2)O(3) have been synthesized. An anionic surfactant-assisted hydrothermal process yields gamma-AlOOH nanotubes, and appropriate calcination treatment of the gamma-AlOOH nanotubes yields gamma-Al(2)O(3) nanotubes. The nanotubes were characterized by XRD, SEM, TEM, TG-DSC, FTIR and nitrogen adsorption-desorption techniques. Both the gamma-AlOOH and gamma-Al(2)O(3) nanotubes are crystalline, with a representative length of approximately 500 nm and diameters of 20-40 nm. The gamma-Al(2)O(3) nanotubes exhibit a very high mesoporous specific surface area (SSA) of 201.0 m(2) g(-1) and a high mesopore volume of 0.68 cm(3) g(-1) with an average mesopore size of 27.7 nm, as well as a high microporous SSA of 186.0 m(2) g(-1) and a micropore volume of 0.08 cm(3) g(-1) with an average micropore size of 0.53 nm. The formation process was discussed and a possible mechanism was proposed, in which a lamellar phase was first formed by camphorsulfonic anions and Al(III) species, and then rolled up to form the crystalline nanotubes under the hydrothermal condition. The catalytic performance of the obtained gamma- Al(2)O(3) nanotubes was tested by using the dehydration of ethanol to ethylene as a probe reaction and it was shown that the obtained gamma- Al(2)O(3) nanotubes catalyst possesses a higher catalytic activity compared with the gamma- Al(2)O(3) nanoparticles.
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Affiliation(s)
- C L Lu
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, People's Republic of China
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Shen G, Chen PC, Ryu K, Zhou C. Devices and chemical sensing applications of metal oxide nanowires. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b816543b] [Citation(s) in RCA: 272] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Wan WT, Yu DM, Huang LB, Xie YC, Guo XS, Zhang J. Size Effect of Al2O3 Nanowires on the Molecular Relaxation in Epoxy Composites. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200800015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Chang MT, Chou LJ, Chueh YL, Lee YC, Hsieh CH, Chen CD, Lan YW, Chen LJ. Nitrogen-doped tungsten oxide nanowires: low-temperature synthesis on Si, and electrical, optical, and field-emission properties. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2007; 3:658-64. [PMID: 17315263 DOI: 10.1002/smll.200600562] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Very dense and uniformly distributed nitrogen-doped tungsten oxide (WO(3)) nanowires were synthesized successfully on a 4-inch Si(100) wafer at low temperature. The nanowires were of lengths extending up to 5 mum and diameters ranging from 25 to 35 nm. The highest aspect ratio was estimated to be about 200. An emission peak at 470 nm was found by photoluminescence measurement at room temperature. The suggested growth mechanism of the nanowires is vapor-solid growth, in which gaseous ammonia plays a significant role to reduce the formation temperature. The approach has proved to be a reliable way to produce nitrogen-doped WO(3) nanowires on Si in large quantities. The direct fabrication of WO(3)-based nanodevices on Si has been demonstrated.
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Affiliation(s)
- Mu-Tung Chang
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan 300, R.O.C
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31
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Quantum, classical, and multi-scale simulation of silica–water interaction: molecules, clusters, and extended systems. ACTA ACUST UNITED AC 2006. [DOI: 10.1007/s10820-006-9009-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Cheng B, Qu S, Zhou H, Wang Z. Al2O3:Cr3+ Nanotubes Synthesized via Homogenization Precipitation Followed by Heat Treatment. J Phys Chem B 2006; 110:15749-54. [PMID: 16898721 DOI: 10.1021/jp062246h] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cr3+-doped NH4Al(OH)2CO3 nanotubes, templated by surfactant assemblies, were successfully synthesized via the homogenization precipitation method, and various crystallographic phase Al2O3:Cr3+ nanotubes were also obtained by postannealing at different temperatures. The characteristic R1, R2 doublet line transitions of ruby can be observed in the high crystalline alpha-Al2O3 nanotubes calcined at temperatures higher than 1200 degrees C. The results also indicate that the formation mechanism of the tubular nanostructures should result from the self-rolling action of layered compound NH4Al(OH)2CO3 under the assistance of the surfactant soft-template. The convenient synthetic procedure, excellent reproducibility, clean reactions, high yield, and fine quality of products in this work make the present route attractive and significant. Aluminum oxide nanotubes with high specific surface area could be used as fabricating nanosized optical devices doped with different elements and stable catalyst supports of metal clusters.
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Affiliation(s)
- Baochang Cheng
- Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, People's Republic of China.
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Xia T, Li Q, Liu X, Meng J, Cao X. Morphology-Controllable Synthesis and Characterization of Single-Crystal Molybdenum Trioxide. J Phys Chem B 2006; 110:2006-12. [PMID: 16471776 DOI: 10.1021/jp055945n] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Molybdenum trioxide nanobelts and prism-like particles with good crystallinity and high surface areas have been prepared by a facile hydrothermal method, and the morphology could be controlled by using different inorganic salts, such as KNO3, Ca(NO3)2 , La(NO3)3, etc. The possible growth mechanism of molybdenum trioxide prism-like particles is discussed on the basis of the presence of H+ and the modification of metal cations. The as-prepared nanomaterials are characterized by means of powder X-ray diffraction (PXRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), Fourier transformation infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and ultraviolet and visible spectroscopy (UV-vis). TEM and HRTEM micrographs show that the molybdenum trioxide nanobelts and prism-like particles have a relatively high degree of crystallinity and uniformity. BET specific surface areas of the as-prepared molybdenum trioxide nanocrystals are 67-79 m2 g-1. XPS analysis indicates that the hexavalent molybdenum is predominant in the nanocrystals. UV-vis spectra reveal that the direct band gap energy of the annealed molybdenum trioxide prism-like particles shows a pronounced blue shift compared to that of bulk MoO3 powder. Interestingly, molybdenum trioxide nanobelts exhibit a red shift under this condition.
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Affiliation(s)
- Tian Xia
- Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, People's Republic of China
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He Y, Cao C, Wan YX, Cheng HP. From cluster to bulk: Size dependent energetics of silica and silica-water interaction. J Chem Phys 2006; 124:024722. [PMID: 16422641 DOI: 10.1063/1.2140696] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
We present our computational investigations on the energetics of clusters that consist of H2O and SiO2 using first-principles Born-Oppenheimer molecular dynamics method. Cohesive energy and hydration energy of both pure (or dry) and hydroxylated (or wet) ring-structured clusters have been investigated as functions of system size. We have found clear trends of energy as the cluster size increases. Energetics of a small silica nano-rod that contains 108 atoms is also obtained as a middle reference point for size evolution. Results from cluster and nano-rod calculations are compared with values from bulk quartz calculations using the same level of theoretical treatments.
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Affiliation(s)
- Yao He
- Department of Physics and the Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA
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Chen Y, Chi B, Liu Q, Mahon DC, Chen Y. Fluoride-assisted synthesis of mullite (Al5.65Si0.35O9.175) nanowires. Chem Commun (Camb) 2006:2780-2. [PMID: 17009461 DOI: 10.1039/b603999e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel silicon-deficient mullite (Al5.65Si0.35O9.175) single crystal nanowires were synthesized in large quantities on mica substrates assisted by the intermediate fluoride species. The nanowires have diameters in the range 50-100 nm and typical lengths of several microm. Aligned nanowires were observed at the substrate edge. The nanowires have strong photoluminescence (PL) emission bands at 310, 397, 452 and 468 nm.
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Affiliation(s)
- Yongjun Chen
- Department of Electronic Materials Engineering, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia.
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Tang B, Ge J, Zhuo L, Wang G, Niu J, Shi Z, Dong Y. A Facile and Controllable Synthesis of γ-Al2O3 Nanostructures without a Surfactant. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200500159] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Peng X, Wang J, Thomas DF, Chen A. Tunable growth of TiO(2) nanostructures on Ti substrates. NANOTECHNOLOGY 2005; 16:2389-2395. [PMID: 20818023 DOI: 10.1088/0957-4484/16/10/066] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A simple and facile method is described to directly synthesize TiO(2) nanostructures on titanium substrates by oxidizing Ti foil using small organic molecules as the oxygen source. The effect of reaction temperature and oxygen source on the formation of the TiO(2) nanostructures has been studied using scanning electron microscopy, x-ray diffraction, transmission electron microscopy, Raman spectroscopy and water contact angle measurement. Polycrystalline grains are formed when pure oxygen and formic acid are used as the oxygen source; elongated micro-crystals are produced when water vapour is used as the oxygen source; oriented and aligned TiO(2) nanorod arrays are synthesized when ethanol, acetaldehyde or acetone are used as the oxygen source. The growth mechanism of the TiO(2) nanostructures is discussed. The diffusion of Ti atoms to the oxide/gas interface via the network of the grain boundaries of the thin oxide layer is the determining factor for the formation of well-aligned TiO(2) nanorod arrays. The wetting properties of the TiO(2) nanostructured surfaces formed are dictated by their structure, varying from a hydrophilic surface to a strongly hydrophobic surface as the surface structure changes from polycrystalline grains to well-aligned nanorod arrays. This tunable growth of TiO(2) nanostructures is desirable for promising applications of TiO(2) nanostructures in the development of optical devices, sensors, photo-catalysts and self-cleaning coatings.
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Affiliation(s)
- Xinsheng Peng
- Department of Chemistry, Lakehead University, Thunder Bay, ON, P7B 5E1, Canada
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Zhang L, Cheng B, Shi W, Samulski ET. In-situ electrochemical synthesis of 1-dimensional alumina nanostructures. ACTA ACUST UNITED AC 2005. [DOI: 10.1039/b509786j] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Proost J, Van Boxel S. Large-scale synthesis of high-purity, one-dimensional α-Al2O3structures. ACTA ACUST UNITED AC 2004. [DOI: 10.1039/b408631g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Fang XS, Ye CH, Peng XS, Wang YH, Wu YC, Zhang LD. Temperature-controlled growth of α-Al2O3nanobelts and nanosheets. ACTA ACUST UNITED AC 2003. [DOI: 10.1039/b309193g] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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