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Sugawa K, Suzuki A, Honda J, Yabuki T, Tahara H, Hayakawa Y, Furuya M, Ikake H, Kimura T, Kosuge Y, Kurumi S, Akiyama T, Takase K, Otsuki J. Photothermal therapeutic ability of copper open-shell nanostructures that are effective in the second biological transparency window based on symmetry breaking-induced plasmonic properties. J Mater Chem B 2023. [PMID: 37376903 DOI: 10.1039/d3tb00443k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
In this study, a photothermal therapy agent that works efficiently in the second biological transparency window was developed based on the localized surface plasmon (LSP) resonance of symmetry-broken open-shell nanostructures of low-cost Cu (CuOSNs). The strong LSP resonance and superior photothermal conversion ability in the second biological transparency window were achieved by generating the dipolar bonding mode due to the plasmon hybridization between the nanoshell dipole and the nanohole dipole at the opening edge in CuOSNs derived from the symmetry breaking of a Cu nanoshell. Oxidative dissolution of CuOSNs in water was significantly suppressed by successive coating with the self-assembled monolayer of 16-mercaptohexadecanoic acid and a thin silica layer. Furthermore, the stability in phosphate buffered saline, which models the biological environment, was attained by further coating the nanoparticles with polyethylene glycol. It was demonstrated from in vitro cell tests using HeLa cells that the cytotoxicity of CuOSNs was effectively suppressed by the surface protection. The viability of HeLa cells incubated with CuOSNs was decreased under the irradiation of low intensity 1060 nm laser with increasing number of CuOSNs. These results demonstrate that low-cost symmetry-broken Cu-based nanostructures can act as an excellent photothermal therapy agent in the second biological transparency window.
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Affiliation(s)
- Kosuke Sugawa
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
| | - Arisa Suzuki
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
| | - Jotaro Honda
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
| | - Taiku Yabuki
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
| | - Hironobu Tahara
- Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki, 852-8521, Japan
| | - Yutaro Hayakawa
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
| | - Masato Furuya
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
| | - Hiroki Ikake
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
| | - Tsuyoshi Kimura
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yasuhiro Kosuge
- Laboratory of Pharmacology, School of Pharmacy, Nihon University, 7-7-1 Narashinodai, Chiba, Funabashi 274-8555, Japan
| | - Satoshi Kurumi
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
| | - Tsuyoshi Akiyama
- Department of Materials Science, School of Engineering, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
| | - Kouichi Takase
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
| | - Joe Otsuki
- College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan.
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2
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Shalini V, Harish S, Ikeda H, Hayakawa Y, Archana J, Navaneethan M. Enhancement of thermoelectric power factor via electron energy filtering in Cu doped MoS 2 on carbon fabric for wearable thermoelectric generator applications. J Colloid Interface Sci 2023; 633:120-131. [PMID: 36436346 DOI: 10.1016/j.jcis.2022.10.147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 10/21/2022] [Accepted: 10/27/2022] [Indexed: 11/06/2022]
Abstract
The design and construction of state-of-the-art wearable thermoelectric materials are important for the development of self-powered wearable thermoelectric generators (WTEGs). Molybdenum disulfide (MoS2) has been reported as a noteworthy thermoelectric (TE) material because of its large intrinsic bandgap and high carrier mobility. In this work, Cu-doped two-dimensional layered MoS2 nanosheets were grown on carbon fabric (CF) via a hydrothermal method. The electrical conductivity, Seebeck coefficient, and power factor for the Cu-doped MoS2 were found to increase with increasing temperature. The maximum Seebeck coefficient was obtained for a MoS2 sample doped with 4 at% of Cu (CM4) was ∼10 μV/K at 303 K and ∼13 μV/K at 373 K. The enhancement in the Seebeck coefficient was attributed to an energy-filtering effect caused by the interfacial barrier between MoS2 and Cu. In addition, a thermoelectric device was designed with four pairs of TE materials, where CM4 (4 at%) was used as a p-type material and Cu wire was used as an n-type material. These p- and n-type materials were connected electrically in series and thermally in parallel to generate a voltage of 190.7 μV at a temperature gradient of 8 K.
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Affiliation(s)
- V Shalini
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka 432-8011, Japan; Functional Materials and Energy Devices Laboratory, Department of Physics Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India
| | - S Harish
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka 432-8011, Japan; Functional Materials and Energy Devices Laboratory, Department of Physics Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India
| | - H Ikeda
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka 432-8011, Japan; Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka 432-8011, Japan.
| | - Y Hayakawa
- Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka 432-8011, Japan
| | - J Archana
- Functional Materials and Energy Devices Laboratory, Department of Physics Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India
| | - M Navaneethan
- Functional Materials and Energy Devices Laboratory, Department of Physics Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India; Nanotechnology Research Center, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India.
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3
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Sugawa K, Hayakawa Y, Aida Y, Kajino Y, Tamada K. Two-dimensional assembled PVP-modified silver nanoprisms guided by butanol for surface-enhanced Raman scattering-based invisible printing platforms. Nanoscale 2022; 14:9278-9285. [PMID: 35762405 DOI: 10.1039/d2nr01725c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
This study proposes a methodology for the fabrication of two-dimensional assembled colloidal nanocrystals based on the classical theory for the surface excess of a short-chain alcohol (butanol) in an aqueous mixture and Rayleigh-Bénard-Marangoni convection caused by temperature and/or surface tension gradients due to the volatilization of butanol at the air-water interface. When polyvinylpyrrolidone (PVP)-modified anisotropic silver nanoprisms dispersed in butanol were added into the water phase, the nanoprisms were guided to the air-water interface via adsorbed butanol together with free butanol and formed dense two-dimensional assemblies through the lateral attraction between nanoprisms as the adsorbed butanol was volatilized. The obtained dense film composed of silver nanoprisms exhibited surface-enhanced Raman scattering (SERS) activity, and in particular, the activity was largely enhanced by low-pressure plasma treatment. A SERS-based invisible printing platform that could only be recognized by x-y SERS mapping was demonstrated with the patterned nanoprism films.
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Affiliation(s)
- Kosuke Sugawa
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan.
| | - Yutaro Hayakawa
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan.
| | - Yukiko Aida
- Institute for Materials Chemistry and Engineering (IMCE), Kyushu University, 744 Motooka, Nishiku, Fukuoka 819-0395, Japan.
| | - Yuto Kajino
- Institute for Materials Chemistry and Engineering (IMCE), Kyushu University, 744 Motooka, Nishiku, Fukuoka 819-0395, Japan.
| | - Kaoru Tamada
- Institute for Materials Chemistry and Engineering (IMCE), Kyushu University, 744 Motooka, Nishiku, Fukuoka 819-0395, Japan.
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Hayakawa Y, Furuya M, Tahara H, Kosuge Y, Kimura T, Sugawa K, Otsuki J. Modulation Technique of Localized Surface Plasmon Resonance of Palladium Nanospheres by Coating with Titanium Dioxide Shell for Application to Photothermal Therapy Agent. Nanoscale Res Lett 2022; 17:60. [PMID: 35737136 PMCID: PMC9226246 DOI: 10.1186/s11671-022-03697-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 06/15/2022] [Indexed: 05/17/2023]
Abstract
Although plasmonic palladium (Pd) nanospheres are thermodynamically stable and have high photothermal conversion due to the free and bound electron coupling associated with the intrinsic high interband transition, they have not attracted attention as a photothermal conversion material for next-generation photothermal cancer therapy. This is because the Pd nanospheres generate the localized surface plasmon resonance (LSPR) intrinsically in the ultraviolet region, which is far away from the biological transparent window (750-900 nm). In this study, we controlled the LSP wavelength of Pd nanospheres by coating with high refractive index TiO2 shells taking advantage of the Pd LSPR which is highly sensitive to changes in the local refractive index around the nanospheres. Our calculations indicated that the absorption cross section at 808 nm (corresponding to the wavelength used for photothermal treatment) was increased by 4.5 times by redshifting the LSPR and increasing the extinction intensity associated with the coating with TiO2 shell. Experiments confirmed the theoretical prediction in that the LSPR of the synthesized Pd nanospheres with a diameter of 81 nm was significantly redshifted by coating with amorphous TiO2 shell, resulting in significant large extinction intensity at 808 nm. The photothermal conversion efficiency was estimated to be 50%. In vitro cell tests, HeLa cells incubated with 100-300 μg/mL TiO2-coated Pd nanospheres were efficiently killed by irradiating 808 nm laser (1.8 W) even though the nanospheres with the same concentrations showed little cytotoxicity. These results indicate that the Pd nanospheres coated with high refractive index shells can be promising as a photothermal therapy agent.
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Affiliation(s)
- Yutaro Hayakawa
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Chiyoda, Tokyo, 101-8308, Japan
| | - Masato Furuya
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Chiyoda, Tokyo, 101-8308, Japan
| | - Hironobu Tahara
- Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki, 852-8521, Japan
| | - Yasuhiro Kosuge
- Laboratory of Pharmacology, School of Pharmacy, Nihon University, 7-7-1 Narashinodai, Chiba, Funabashi, 274-8555, Japan
| | - Tsuyoshi Kimura
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Chiyoda, Tokyo, 101-0062, Japan
| | - Kosuke Sugawa
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Chiyoda, Tokyo, 101-8308, Japan.
| | - Joe Otsuki
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Chiyoda, Tokyo, 101-8308, Japan
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5
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Athithya S, Harish S, IKeda H, Shimomura M, Hayakawa Y, Archana J, Navaneethan M. Hierarchically ordered macroporous TiO 2 architecture via self-assembled strategy for environmental remediation. Chemosphere 2022; 288:132236. [PMID: 34649090 DOI: 10.1016/j.chemosphere.2021.132236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 09/01/2021] [Accepted: 09/09/2021] [Indexed: 06/13/2023]
Abstract
Hierarchical orderd macroporous TiO2 architecture (HOMTA) was prepared with aid of ethylenediamine (EDA) and investigated the impact of amine molecules on the properties of TiO2 architecture. The different variation of amine molecules (EDA) leads to tunning the morphology under hydrothermal approach which is confirmed by FESEM and TEM analysis. The XRD and Raman studies confirms the crystal structure of anatase and brookite phase of TiO2. The surface of the architecture strongly depended on the concentration of EDA which plays a vital role in surface area which is revealed by Brunauer Emmett-Teller (BET) analysis. The obtained HOMTA was employed as photocatalyst and active photoanode in the dye sensitized solar cells (DSSC). The DSSC device exhibits excellent efficiency (η) of 5.27% for the EDA capped TiO2 (S5) which had high surface area (167.11 m2/g) for better dye loading, whereas the lower concentration of EDA capped TiO2 (S1, S2, S3 and S4) resulted the efficiency of 2.14, 3.90, 3.25 and 4.37%, respectively. The efficiency of photocatlysis degradation of the prepared samples (S1, S2, S3, S4 and S5) was 94.8, 90.47, 91.41, 91.32 and 93.75% under light source. The excellent photocatalysis property was achieved by S5 within 6 min due to high surface area which inducing more active site.
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Affiliation(s)
- S Athithya
- Funtional Materials and Energy Devices, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603 203, Tamil Nadu, India
| | - S Harish
- Funtional Materials and Energy Devices, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603 203, Tamil Nadu, India
| | - H IKeda
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka, 432-8011, Japan; Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka, 432-8011, Japan
| | - M Shimomura
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka, 432-8011, Japan
| | - Y Hayakawa
- Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka, 432-8011, Japan
| | - J Archana
- Funtional Materials and Energy Devices, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603 203, Tamil Nadu, India.
| | - M Navaneethan
- Funtional Materials and Energy Devices, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603 203, Tamil Nadu, India; Nanotechnology Research Center, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603 203, Tamil Nadu, India.
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6
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Takeshima N, Sugawa K, Tahara H, Jin S, Noguchi M, Hayakawa Y, Yamakawa Y, Otsuki J. Combined Use of Anisotropic Silver Nanoprisms with Different Aspect Ratios for Multi-Mode Plasmon-Exciton Coupling. Nanoscale Res Lett 2020; 15:15. [PMID: 31950368 PMCID: PMC6965570 DOI: 10.1186/s11671-020-3248-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Accepted: 01/05/2020] [Indexed: 06/10/2023]
Abstract
Absorption enhancement based on interaction between the localized surface plasmon (LSP) and molecular exciton is one of the most important phenomena for the development of high-performance solar devices. In this study, hybrids of plasmonic metal nanoparticles and dye molecules have been developed, which exhibit enhanced absorption at precisely tuned wavelengths in a visible region. The hybrids consist of a porphyrin derivative, which has four absorption peaks (Q-bands) in a range of 500-700 nm, and triangular silver nanoprisms (AgPRs), which are developed by us to exhibit precisely tuned LSP resonance wavelengths. Absorption enhancement over the whole Q-band range is induced by the combined use of three kinds of AgPRs of different aspect ratios. Furthermore, the quantitative evaluation of absorption enhancement based on the LSP-based fluorescence enhancement phenomenon has demonstrated that efficient absorption enhancement can be effected at multiple wavelengths.
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Affiliation(s)
- Naoto Takeshima
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308, Japan
| | - Kosuke Sugawa
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308, Japan.
| | - Hironobu Tahara
- Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki, 852-8521, Japan
| | - Shota Jin
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308, Japan
| | - Masaki Noguchi
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308, Japan
| | - Yutaro Hayakawa
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308, Japan
| | - Yuhei Yamakawa
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308, Japan
| | - Joe Otsuki
- Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-8308, Japan
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Maheswari P, Ponnusamy S, Harish S, Ganesh M, Hayakawa Y. Hydrothermal synthesis of pure and bio modified TiO2: Characterization, evaluation of antibacterial activity against gram positive and gram negative bacteria and anticancer activity against KB Oral cancer cell line. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2018.11.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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8
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Kavirajan S, Archana J, Harish S, Navaneethan M, Ponnusamy S, Hayakawa K, Kubota Y, Shimomura M, Hayakawa Y. Effect of densification technique and carrier concentration on the thermoelectric properties of n-type Cu 1.45Ni 1.45Te 2 ternary compound. CrystEngComm 2020. [DOI: 10.1039/d0ce01166e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cu1.45Ni1.45Te2 ternary compound was synthesized by solid-state ball-milling method and densified via spark plasma sintering (SPS) and cold-pressing with annealing (CPA) techniques.
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Affiliation(s)
- S. Kavirajan
- Functional Materials and Energy Devices Laboratory
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- Kattankulathur
- India
| | - J. Archana
- Functional Materials and Energy Devices Laboratory
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- Kattankulathur
- India
| | - S. Harish
- Functional Materials and Energy Devices Laboratory
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- Kattankulathur
- India
| | - M. Navaneethan
- Functional Materials and Energy Devices Laboratory
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- Kattankulathur
- India
| | - S. Ponnusamy
- Functional Materials and Energy Devices Laboratory
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- Kattankulathur
- India
| | - K. Hayakawa
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
| | - Y. Kubota
- Department of Mechanical Engineering
- Shizuoka University
- Hamamatsu
- Japan
| | - M. Shimomura
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
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Takeshima N, Sugawa K, Tahara H, Jin S, Wakui H, Fukushima M, Tokuda K, Igari S, Kanakubo K, Hayakawa Y, Katoh R, Takase K, Otsuki J. Plasmonic Silver Nanoprism-Induced Emissive Mode Control between Fluorescence and Phosphorescence of a Phosphorescent Palladium Porphyrin Derivative. ACS Nano 2019; 13:13244-13256. [PMID: 31633926 DOI: 10.1021/acsnano.9b06269] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We have succeeded in significantly enhancing fluorescence from intrinsically phosphorescent palladium octaethylporphyrin (Pd-porphyrin) that has an intersystem crossing efficiency of ∼1 by using silver nanoprisms (AgPRs). This was achieved by controlling the wavelength of the localized surface plasmon (LSP) resonance of AgPRs and the distance between the Pd-porphyrin molecules and the AgPR surfaces. In addition to enhancing phosphorescence by spectrally overlapping the phosphorescence band with the LSP resonance band, tuning the LSP wavelength to approximately 520 nm led to the appearance of a new emission band around the wavelength corresponding to the fluorescent radiation. The appearance of fluorescence suggests that the nonradiative energy transfer from the singlet excited state of Pd-porphyrin to the LSP of AgPRs overcame the ultrafast intramolecular intersystem crossing to the triplet excited state, manifesting the spectral properties of the singlet excited state of Pd-porphyrin. The fluorescence nature of this radiation was strongly supported by lifetime measurements of the hybrids of Pd-porphyrin and AgPRs. Furthermore, the dependence of the emissive intensities on the distance between the Pd-porphyrin molecules and the AgPR surfaces showed interesting opposite trends. The fluorescence intensity was increased as the distance between the molecules and the AgPRs was decreased from 10.5 to 1 nm, while the phosphorescence intensity was decreased, which indicates that the LSP-induced fluorescence radiation process from Pd-porphyrin near the AgPRs outweighed the quenching by the AgPRs, even though the phosphorescence significantly suffered quenching.
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Affiliation(s)
- Naoto Takeshima
- Department of Materials and Applied Chemistry, College of Science and Technology , Nihon University , Kanda-Surugadai, Chiyoda-ku , Tokyo 101-8308 , Japan
| | - Kosuke Sugawa
- Department of Materials and Applied Chemistry, College of Science and Technology , Nihon University , Kanda-Surugadai, Chiyoda-ku , Tokyo 101-8308 , Japan
| | - Hironobu Tahara
- Graduate School of Engineering , Nagasaki University , Bunkyo, Nagasaki 852-8521 , Japan
| | - Shota Jin
- Department of Materials and Applied Chemistry, College of Science and Technology , Nihon University , Kanda-Surugadai, Chiyoda-ku , Tokyo 101-8308 , Japan
| | - Hiroki Wakui
- Department of Chemical Biology and Applied Chemistry, College of Engineering , Nihon University , Koriyama , Fukushima 963-8642 , Japan
| | - Misa Fukushima
- Department of Chemical Biology and Applied Chemistry, College of Engineering , Nihon University , Koriyama , Fukushima 963-8642 , Japan
| | - Kyo Tokuda
- Department of Materials and Applied Chemistry, College of Science and Technology , Nihon University , Kanda-Surugadai, Chiyoda-ku , Tokyo 101-8308 , Japan
| | - Shuto Igari
- Department of Materials and Applied Chemistry, College of Science and Technology , Nihon University , Kanda-Surugadai, Chiyoda-ku , Tokyo 101-8308 , Japan
| | - Kotomi Kanakubo
- Department of Materials and Applied Chemistry, College of Science and Technology , Nihon University , Kanda-Surugadai, Chiyoda-ku , Tokyo 101-8308 , Japan
| | - Yutaro Hayakawa
- Department of Materials and Applied Chemistry, College of Science and Technology , Nihon University , Kanda-Surugadai, Chiyoda-ku , Tokyo 101-8308 , Japan
| | - Ryuzi Katoh
- Department of Chemical Biology and Applied Chemistry, College of Engineering , Nihon University , Koriyama , Fukushima 963-8642 , Japan
| | - Kouichi Takase
- Department of Physics, College of Science and Technology , Nihon University , Kanda-Surugadai, Chiyoda-ku , Tokyo 101-0062 , Japan
| | - Joe Otsuki
- Department of Materials and Applied Chemistry, College of Science and Technology , Nihon University , Kanda-Surugadai, Chiyoda-ku , Tokyo 101-8308 , Japan
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Sankar Ganesh R, Patil V, Durgadevi E, Navaneethan M, Ponnusamy S, Muthamizhchelvan C, Kawasaki S, Patil P, Hayakawa Y. Growth of Fe doped ZnO nanoellipsoids for selective NO2 gas sensing application. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136725] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Saravanan T, Anandan P, Shanmugam M, Azhagurajan M, Mohamed Ismail M, Arivanandhan M, Hayakawa Y, Jayavel R. Facile synthesis of Yb2O3–graphene nanocomposites for enhanced energy and environmental applications. Polym Bull (Berl) 2019. [DOI: 10.1007/s00289-019-02945-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Harish S, Naveen AN, Abinaya R, Archana J, Ramesh R, Navaneethan M, Shimomura M, Hayakawa Y. Enhanced performance on capacity retention of hierarchical NiS hexagonal nanoplate for highly stable asymmetric supercapacitor. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.06.161] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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13
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Abinaya R, Archana J, Harish S, Navaneethan M, Ponnusamy S, Muthamizhchelvan C, Shimomura M, Hayakawa Y. Ultrathin layered MoS2 nanosheets with rich active sites for enhanced visible light photocatalytic activity. RSC Adv 2018; 8:26664-26675. [PMID: 35541077 PMCID: PMC9083125 DOI: 10.1039/c8ra02560f] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Accepted: 05/24/2018] [Indexed: 01/12/2023] Open
Abstract
Edge-rich active sites of ultrathin layered molybdenum disulphide (MoS2) nanosheets were synthesized by a hydrothermal method. The effect of pH on the formation of MoS2 nanosheets and their photocatalytic response have been investigated. Structural and elemental analysis confirm the presence of S–Mo–S in the composition. Morphological analysis confirms the presence of ultrathin layered nanosheets with a sheet thickness of 10–28 nm at pH 1. The interplanar spacing of MoS2 layers is in good agreement with the X-ray diffraction and high-resolution transmission electron microscopy results. A comparative study of the photocatalytic performance for the degradation of methylene blue (MB) and rhodamine B (RhB) by ultrathin layered MoS2 under visible light irradiation was performed. The photocatalytic activity of the edge-rich ultrathin layered nanosheets showed a fast response time of 36 min with the degradation rate of 95.3% of MB and 41.1% of RhB. The photocatalytic degradation of MB was superior to that of RhB because of the excellent adsorption of MB than that of RhB. Photogenerated superoxide radicals were the key active species for the decomposition of organic compounds present in water, as evidenced by scavenger studies. Edge-rich active sites of ultrathin layered molybdenum disulphide (MoS2) nanosheets were synthesized by a hydrothermal method.![]()
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Affiliation(s)
- R. Abinaya
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
- Graduate School of Science and Technology
| | - J. Archana
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
- SRM Research Institute
| | - S. Harish
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - M. Navaneethan
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
- SRM Research Institute
| | - S. Ponnusamy
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
| | - C. Muthamizhchelvan
- Center for Material Science and Nanodevices
- Department of Physics and Nanotechnology
- SRM Institute of Science and Technology
- India
| | - M. Shimomura
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
- Graduate School of Science and Technology
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14
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Ganesh RS, Durgadevi E, Navaneethan M, Patil V, Ponnusamy S, Muthamizhchelvan C, Kawasaki S, Patil P, Hayakawa Y. Controlled synthesis of Ni-doped ZnO hexagonal microdiscs and their gas sensing properties at low temperature. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.09.057] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Ganesh RS, Durgadevi E, Navaneethan M, Sharma SK, Binitha H, Ponnusamy S, Muthamizhchelvan C, Hayakawa Y. Visible light induced photocatalytic degradation of methylene blue and rhodamine B from the catalyst of CdS nanowire. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.06.021] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Nakashima T, Kubota T, Kawaguchi T, Nawa T, Hayakawa Y, Watanabe T, Tanaka T, Takasugi N, Iwasa M, Yamada Y, Kanamori H, Ushikoshi H, Kawasaki M, Nishigaki K, Minatoguchi S. P6140Impact of the pulmonary vein orifice area assessed by intracardiac echocardiography on the outcome of pulmonary vein isolation for atrial fibrillation. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p6140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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17
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Harish S, Sabarinathan M, Kristy AP, Archana J, Navaneethan M, Ikeda H, Hayakawa Y. ZnS quantum dots impregnated-mesoporous TiO2 nanospheres for enhanced visible light induced photocatalytic application. RSC Adv 2017. [DOI: 10.1039/c7ra03061d] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ZnS quantum dots were impregnated on the surface of TiO2 mesospheres by a soft template-assisted solvothermal approach.
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Affiliation(s)
- S. Harish
- Research Institute of Electronics
- Shizuoka University
- Shizuoka 432-8011
- Japan
| | - M. Sabarinathan
- Research Institute of Electronics
- Shizuoka University
- Shizuoka 432-8011
- Japan
| | - A. Periyanayaga Kristy
- SRM Research Institute
- Department of Physics and Nanotechnology
- SRM University
- Chennai
- India
| | - J. Archana
- SRM Research Institute
- Department of Physics and Nanotechnology
- SRM University
- Chennai
- India
| | - M. Navaneethan
- Research Institute of Electronics
- Shizuoka University
- Shizuoka 432-8011
- Japan
| | - H. Ikeda
- Research Institute of Electronics
- Shizuoka University
- Shizuoka 432-8011
- Japan
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Shizuoka 432-8011
- Japan
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18
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Sabarinathan M, Harish S, Archana J, Navaneethan M, Ikeda H, Hayakawa Y. Highly efficient visible-light photocatalytic activity of MoS2–TiO2 mixtures hybrid photocatalyst and functional properties. RSC Adv 2017. [DOI: 10.1039/c7ra03633g] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
2D-layered molybdenum disulfide (MoS2) and MoS2/TiO2 nanocomposite were synthesized by a hydrothermal method.
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Affiliation(s)
- M. Sabarinathan
- Graduate School of Science and Technology
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - S. Harish
- Graduate School of Science and Technology
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - J. Archana
- SRM Research Institute
- Department of Physics and Nanotechnology
- SRM University
- Chennai
- India
| | - M. Navaneethan
- Research Institute of Electronics
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - H. Ikeda
- Research Institute of Electronics
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - Y. Hayakawa
- Graduate School of Science and Technology
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
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19
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Rameshbabu R, Vinoth R, Navaneethan M, Hayakawa Y, Neppolian B. Fabrication of Cu2MoS4 hollow nanotubes with rGO sheets for enhanced visible light photocatalytic performance. CrystEngComm 2017. [DOI: 10.1039/c6ce02337a] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Harish S, Archana J, Navaneethan M, Ponnusamy S, Singh A, Gupta V, Aswal DK, Ikeda H, Hayakawa Y. Synergetic effect of CuS@ZnS nanostructures on photocatalytic degradation of organic pollutant under visible light irradiation. RSC Adv 2017. [DOI: 10.1039/c7ra04250g] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ultrafast visible light active CuS/ZnS nanostructured photocatalysts were synthesized by a hydrothermal method.
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Affiliation(s)
- S. Harish
- Research Institute of Electronics
- Shizuoka University
- Shizuoka 432-8011
- Japan
| | - J. Archana
- Center for Materials Science and Nano Devices
- Department of Physics and Nanotechnology
- SRM University
- Chennai
- India
| | - M. Navaneethan
- Research Institute of Electronics
- Shizuoka University
- Shizuoka 432-8011
- Japan
- Center for Materials Science and Nano Devices
| | - S. Ponnusamy
- Center for Materials Science and Nano Devices
- Department of Physics and Nanotechnology
- SRM University
- Chennai
- India
| | - Ajay Singh
- Technical Physics Division
- Bhabha Atomic Research Center
- Mumbai 400 085
- India
| | - Vinay Gupta
- Organic and Hybrid Solar Cell Group
- CSIR-National Physical Laboratory
- New Delhi
- India
| | - D. K. Aswal
- Organic and Hybrid Solar Cell Group
- CSIR-National Physical Laboratory
- New Delhi
- India
| | - H. Ikeda
- Research Institute of Electronics
- Shizuoka University
- Shizuoka 432-8011
- Japan
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Shizuoka 432-8011
- Japan
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21
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Kanchana P, Radhakrishnan S, Navaneethan M, Arivanandhan M, Hayakawa Y, Sekar C. Electrochemical Sensor Based on Fe Doped Hydroxyapatite-Carbon Nanotubes Composite for L-Dopa Detection in the Presence of Uric Acid. J Nanosci Nanotechnol 2016; 16:6185-6192. [PMID: 27427688 DOI: 10.1166/jnn.2016.11645] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A novel amperometric sensor based on iron doped hydroxyapatite (Fe-HA) and multiwalled carbon nanotubes (CNT) composite immobilized on a glassy carbon electrode (GCE) has been fabricated. The hybrid composite made of Fe-HA nanoparticles and CNT promotes electron transfer kinetics between the analyte levodopa (L-dopa) and the modified GC electrode. Under optimum conditions, the fabricated sensor gave a linear response range of 1.0 x 10(-7)-1.1 x 10(-6) M with the detection limit as low as 62 nM. The Fe-HA/CNT modified electrode showed good selectivity towards the determination of L-dopa in the presence of ascorbic acid (AA), uric acid (UA) and other common interferents. The sensor displays a high sensitivity, good reproducibility and long-term stability and it was successfully applied for the detection of L-dopa in pharmaceutical and medicinal plant samples.
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22
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Archana J, Harish S, Sabarinathan M, Navaneethan M, Ponnusamy S, Muthamizhchelvan C, Shimomura M, Ikeda H, Aswal DK, Hayakawa Y. Highly efficient dye-sensitized solar cell performance from template derived high surface area mesoporous TiO2 nanospheres. RSC Adv 2016. [DOI: 10.1039/c6ra14976f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
High surface area mesoporous anatase TiO2 spheres are synthesized using ethylene glycol as a template by a solvothermal method.
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Affiliation(s)
- J. Archana
- Department of Physics and Nanotechnology
- SRM Research Institute
- SRM University
- Chennai
- India
| | - S. Harish
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - M. Sabarinathan
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - M. Navaneethan
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - S. Ponnusamy
- Department of Physics and Nanotechnology
- SRM Research Institute
- SRM University
- Chennai
- India
| | - C. Muthamizhchelvan
- Department of Physics and Nanotechnology
- SRM Research Institute
- SRM University
- Chennai
- India
| | - M. Shimomura
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - H. Ikeda
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - D. K. Aswal
- National Physical Laboratory
- New Delhi – 110012
- India
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
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23
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Harish S, Archana J, Navaneethan M, Silambarasan A, Nisha KD, Ponnusamy S, Muthamizhchelvan C, Ikeda H, Aswal DK, Hayakawa Y. Enhanced visible light induced photocatalytic activity on the degradation of organic pollutants by SnO nanoparticle decorated hierarchical ZnO nanostructures. RSC Adv 2016. [DOI: 10.1039/c6ra19824d] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
One (1D) and two-dimensional (2D) nanostructures of zinc oxide and tin oxide (ZnO/SnO) nanocomposites were synthesized by a hydrothermal method using ethylenediamine (EDA) as a capping ligand.
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Affiliation(s)
- S. Harish
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - J. Archana
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
- Department of Physics and Nanotechnology
| | - M. Navaneethan
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - A. Silambarasan
- Department of Physics and Nanotechnology
- SRM University
- Chennai
- India
| | - K. D. Nisha
- Department of Physics and Nanotechnology
- SRM University
- Chennai
- India
| | - S. Ponnusamy
- Department of Physics and Nanotechnology
- SRM University
- Chennai
- India
| | | | - H. Ikeda
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - D. K. Aswal
- National Physical Laboratory
- New Delhi – 110012
- India
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
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24
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Sabarinathan M, Harish S, Archana J, Navaneethan M, Ikeda H, Hayakawa Y. Controlled exfoliation of monodispersed MoS2 layered nanostructures by a ligand-assisted hydrothermal approach for the realization of ultrafast degradation of an organic pollutant. RSC Adv 2016. [DOI: 10.1039/c6ra24355j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Molybdenum disulfide (MoS2) layered nanosheets were synthesized by the hydrothermal method.
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Affiliation(s)
- M. Sabarinathan
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
| | - S. Harish
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
| | - J. Archana
- Department of Physics and Nanotechnology
- SRM Research Institute
- SRM University
- Chennai
- India
| | - M. Navaneethan
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - H. Ikeda
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - Y. Hayakawa
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
- Research Institute of Electronics
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25
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Thangappan R, Kalaiselvam S, Elayaperumal A, Jayavel R, Arivanandhan M, Karthikeyan R, Hayakawa Y. Graphene decorated with MoS2 nanosheets: a synergetic energy storage composite electrode for supercapacitor applications. Dalton Trans 2016; 45:2637-46. [DOI: 10.1039/c5dt04832j] [Citation(s) in RCA: 164] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The synergistic effect of MoS2 and graphene with a specific capacitance of 270 F g−1 for the use of a higher performance energy storage composite electrode for supercapacitors is reported.
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Affiliation(s)
- R. Thangappan
- Centre for Nanoscience and Technology
- Anna University
- Chennai-25
- India
| | - S. Kalaiselvam
- Department of Applied Science and Technology
- Anna University
- Chennai-25
- India
| | - A. Elayaperumal
- Department of Mechanical Engineering
- Anna University
- Chennai-25
- India
| | - R. Jayavel
- Centre for Nanoscience and Technology
- Anna University
- Chennai-25
- India
| | - M. Arivanandhan
- Centre for Nanoscience and Technology
- Anna University
- Chennai-25
- India
| | - R. Karthikeyan
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
| | - Y. Hayakawa
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
- Research Institute of Electronics
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26
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Kumar A, Samanta S, Singh A, Roy M, Singh S, Basu S, Chehimi MM, Roy K, Ramgir N, Navaneethan M, Hayakawa Y, Debnath AK, Aswal DK, Gupta SK. Fast Response and High Sensitivity of ZnO Nanowires-Cobalt Phthalocyanine Heterojunction Based H2S Sensor. ACS Appl Mater Interfaces 2015; 7:17713-17724. [PMID: 26225901 DOI: 10.1021/acsami.5b03652] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The room temperature chemiresistive response of n-type ZnO nanowire (ZnO NWs) films modified with different thicknesses of p-type cobalt phthalocyanine (CoPc) has been studied. With increasing thickness of CoPc (>15 nm), heterojunction films exhibit a transition from n- to p-type conduction due to uniform coating of CoPc on ZnO. The heterojunction films prepared with a 25 nm thick CoPc layer exhibit the highest response (268% at 10 ppm of H2S) and the fastest response (26 s) among all samples. The X-ray photoelectron spectroscopy and work function measurements reveal that electron transfer takes place from ZnO to CoPc, resulting in formation of a p-n junction with a barrier height of 0.4 eV and a depletion layer width of ∼8.9 nm. The detailed XPS analysis suggests that these heterojunction films with 25 nm thick CoPc exhibit the least content of chemisorbed oxygen, enabling the direct interaction of H2S with the CoPc molecule, and therefore exhibit the fastest response. The improved response is attributed to the high susceptibility of the p-n junctions to the H2S gas, which manipulates the depletion layer width and controls the charge transport.
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Affiliation(s)
| | | | | | | | | | | | - Mohmad M Chehimi
- ∥University Paris Diderot, Sorbonne Paris Cité, ITODYS, CNRS, F-75013 Paris, France
| | | | | | - M Navaneethan
- #Research Institute of Electronics, 3-5-1, Johoku, Shizuoka University, Hamamatsu, Japan
| | - Y Hayakawa
- #Research Institute of Electronics, 3-5-1, Johoku, Shizuoka University, Hamamatsu, Japan
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27
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Saravanan T, Shanmugam M, Anandan P, Azhagurajan M, Pazhanivel K, Arivanandhan M, Hayakawa Y, Jayavel R. Facile synthesis of graphene-CeO2 nanocomposites with enhanced electrochemical properties for supercapacitors. Dalton Trans 2015; 44:9901-8. [PMID: 25940081 DOI: 10.1039/c5dt01235j] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Graphene-ceria (CeO2G) nanocomposites were prepared by using a low-temperature solution process with different weight percentages of graphene, and their electrochemical properties were investigated. Structural properties of the nanocomposites were studied by X-ray diffraction, Raman spectroscopy, and FTIR spectral analyses. FE-SEM and HRTEM images revealed a "wrinkled paper"-like morphology of the prepared composites. Elemental mapping images were recorded by using the FE-EPMA technique. XPS analyses revealed the binding states of different elements present in the composites. The composite with 5% graphene displayed a specific capacitance of 110 F g(-1), according to cyclic voltammetric studies, which is higher than that observed for pure CeO2 (75 F g(-1)). The significant increase in the specific capacitance suggests that the CeO2G is a promising material for supercapacitor applications.
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Affiliation(s)
- T Saravanan
- Centre for Nano Science and Technology, Anna University, Chennai 600025, India.
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28
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Natarajan V, Usharani S, Arivanandhan M, Anandan P, Hayakawa Y. Effect of solvents on the bulk growth of 4-aminobenzophenone single crystals: a potential material for blue and green lasers. Spectrochim Acta A Mol Biomol Spectrosc 2015; 145:329-332. [PMID: 25795606 DOI: 10.1016/j.saa.2015.03.051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 12/23/2014] [Accepted: 03/02/2015] [Indexed: 06/04/2023]
Abstract
Although 4-aminobenzophenone (4-ABP) is the best derivative of benzophenone with 260 times higher second harmonic generation (SHG) efficiency than potassium dihydrogen phosphate (KDP), growth of high quality bulk crystal still remains a difficult task. In the present work, the effect of solvents on solubility and growth aspects of 4-ABP was investigated to grow inclusion free 4-ABP crystals. The growth processes were discussed based on solute-solvent interaction in two different growth media of ethyl acetate and ethanol. The growth rate and thereby solvent inclusions are relatively higher in ethyl acetate grown crystal than the crystal grown from ethanol. The structural, thermal and optical properties of 4-ABP crystals were studied. The enthalpy of 4-ABP melting process was estimated from differential thermal analysis. The optical transmission study shows that 4-ABP crystals grown from ethanol has high transparency compared to ethyl acetate grown sample due to solvent inclusion in the later crystal.
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Affiliation(s)
- V Natarajan
- Department of Physics, Dr. Sivanthi Aditanar College of Engineering, Tiruchendur 628215, India.
| | - S Usharani
- Department of Physics, Dr. Sivanthi Aditanar College of Engineering, Tiruchendur 628215, India
| | - M Arivanandhan
- Research Institute of Electronics, Shizuoka University, Johoku 3-5-1, Naka-Ku, Hamamatsu 432-8011, Japan
| | - P Anandan
- Department of Physics, Thiruvalluvar College of Engineering and Technology, Vandavasi 604505, India
| | - Y Hayakawa
- Research Institute of Electronics, Shizuoka University, Johoku 3-5-1, Naka-Ku, Hamamatsu 432-8011, Japan
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29
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Uenoyama Y, Nakamura S, Hayakawa Y, Ikegami K, Watanabe Y, Deura C, Minabe S, Tomikawa J, Goto T, Ieda N, Inoue N, Sanbo M, Tamura C, Hirabayashi M, Maeda KI, Tsukamura H. Lack of pulse and surge modes and glutamatergic stimulation of luteinising hormone release in Kiss1 knockout rats. J Neuroendocrinol 2015; 27:187-97. [PMID: 25582792 DOI: 10.1111/jne.12257] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2014] [Revised: 01/05/2015] [Accepted: 01/05/2015] [Indexed: 12/11/2022]
Abstract
Kisspeptin, encoded by the Kiss1 gene, has attracted attention as a key candidate neuropeptide in controlling puberty and reproduction via regulation of gonadotrophin-releasing hormone (GnRH) secretion in mammals. Pioneer studies with Kiss1 or its cognate receptor Gpr54 knockout (KO) mice showed the indispensable role of kisspeptin-GPR54 signalling in the control of animal reproduction, although detailed analyses of gonadotrophin secretion, especially pulsatile and surge-mode of luteinising hormone (LH) secretion, were limited. Thus, in the present study, we have generated Kiss1 KO rats aiming to evaluate a key role of kisspeptin in governing reproduction via pulse and surge modes of GnRH/LH secretion. Kiss1 KO male and female rats showed a complete suppression of pulsatile LH secretion, which is responsible for folliculogenesis and spermatogenesis, and an absence of puberty and atrophic gonads. Kiss1 KO female rats showed no spontaneous LH/follicle-stimulating hormone surge and an oestrogen-induced LH surge, suggesting that the GnRH surge generation system, which is responsible for ovulation, does not function without kisspeptin. Furthermore, challenge of major stimulatory neurotransmitters, such as monosodium glutamate, NMDA and norepinephrine, failed to stimulate LH secretion in Kiss1 KO rats, albeit they stimulated LH release in wild-type controls. Taken together, the results of the present study confirm that kisspeptin plays an indispensable role in generating two modes (pulse and surge) of GnRH/gonadotrophin secretion to regulate puberty onset and normal reproductive performance. In addition, the present study suggests that kisspeptin neurones play a critical role as a hub integrating major stimulatory neural inputs to GnRH neurones, using newly established Kiss1 KO rats, which serve as a useful model for detailed analysis of hormonal profiles.
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Affiliation(s)
- Y Uenoyama
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
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30
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Nisha KD, Navaneethan M, Dhanalakshmi B, Saravana Murali K, Hayakawa Y, Ponnusamy S, Muthamizhchelvan C, Gunasekaran P. Effect of organic-ligands on the toxicity profiles of CdS nanoparticles and functional properties. Colloids Surf B Biointerfaces 2015; 126:407-13. [PMID: 25601096 DOI: 10.1016/j.colsurfb.2014.12.044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Revised: 12/17/2014] [Accepted: 12/23/2014] [Indexed: 01/08/2023]
Abstract
CdS nanoparticles are one among the most promising agents for fluorescent imaging. Hence, it is essential to develop new strategies to overcome the cytotoxicity of these nanoparticles. Surface modification is one of the simplest and effective techniques. This paper assesses the effect of surface modification on toxicity of the CdS nanoparticles. Unmodified CdS and surface-modified CdS nanoparticles were synthesized in an aqueous medium using a wet chemical route at room temperature. The surface modification of the CdS nanoparticles with polyvinylpyrrolidone (PVP) and cysteine was confirmed using infrared absorption studies. The diameters of unmodified CdS, PVP-modified CdS, and cysteine-modified CdS nanoparticles were determined using HRTEM. They exhibited luminescence in the range from 500 to 800 nm. The cytotoxic effects of these CdS nanoparticles were investigated in cultures of Vero cells. The results indicated that Vero cell viability was higher for the surface-modified CdS nanoparticles than for the unmodified CdS nanoparticles. The reduction in the toxicity was related to the nature of the capping agents used for the surface modification, and the particle size.
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Affiliation(s)
- K D Nisha
- Asan Memorial College of Engineering and Technology, Chengalpattu 603 105, Tamil Nadu, India
| | - M Navaneethan
- Research Institute of Electronics, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu, Shizuoka 432-8011, Japan.
| | - B Dhanalakshmi
- Asan Memorial College of Engineering and Technology, Chengalpattu 603 105, Tamil Nadu, India
| | - K Saravana Murali
- King Institute of Preventive Medicine and Research, Guindy, Tamil Nadu, India
| | - Y Hayakawa
- Research Institute of Electronics, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu, Shizuoka 432-8011, Japan
| | - S Ponnusamy
- Center for Materials Science and Nanodevices, Department of Physics, SRM University, Kattankulathur 603 203, Tamil Nadu, India.
| | - C Muthamizhchelvan
- Center for Materials Science and Nanodevices, Department of Physics, SRM University, Kattankulathur 603 203, Tamil Nadu, India
| | - P Gunasekaran
- King Institute of Preventive Medicine and Research, Guindy, Tamil Nadu, India
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31
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Harish S, Navaneethan M, Archana J, Silambarasan A, Ponnusamy S, Muthamizhchelvan C, Hayakawa Y. Controlled synthesis of organic ligand passivated ZnO nanostructures and their photocatalytic activity under visible light irradiation. Dalton Trans 2015; 44:10490-8. [DOI: 10.1039/c5dt01572c] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zinc oxide (ZnO) nanostructures were synthesized and their photocatalytic activity was evaluated using methylene blue (MB) as a model pollutant.
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Affiliation(s)
- S. Harish
- Centre for Nanoscience and Nanotechnology
- Department of Physics
- SRM University
- Chennai 603203
- India
| | - M. Navaneethan
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - J. Archana
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
| | - A. Silambarasan
- Centre for Nanoscience and Nanotechnology
- Department of Physics
- SRM University
- Chennai 603203
- India
| | - S. Ponnusamy
- Centre for Nanoscience and Nanotechnology
- Department of Physics
- SRM University
- Chennai 603203
- India
| | - C. Muthamizhchelvan
- Centre for Nanoscience and Nanotechnology
- Department of Physics
- SRM University
- Chennai 603203
- India
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu
- Japan
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32
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Anandha Babu G, Ravi G, Mahalingam T, Kumaresavanji M, Hayakawa Y. Influence of microwave power on the preparation of NiO nanoflakes for enhanced magnetic and supercapacitor applications. Dalton Trans 2015; 44:4485-97. [DOI: 10.1039/c4dt03483j] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Nanoflake-structured NiO were synthesized by a microwave assisted method without the use of additives.
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Affiliation(s)
| | - G. Ravi
- Department of Physics
- Alagappa University
- Karaikudi
- India
| | - T. Mahalingam
- Department of Electrical and Computer Engineering
- Ajou University
- Suwon 443-749
- South Korea
| | - M. Kumaresavanji
- IFIMUP and IN-Institute of Nanoscience and Nanotechnology
- Department of Physics and Astronomy
- University of Porto
- 4169-007 Porto
- Portugal
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu 432-8011
- Japan
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33
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Nirmal Kumar V, Suryakarthick R, Karuppusamy S, Gupta M, Hayakawa Y, Gopalakrishnan R. Effect of precursor concentration on the properties and tuning of conductivity between p-type and n-type Cu1−XCdXS2 thin films deposited by a single step solution process as a novel material for photovoltaic applications. RSC Adv 2015. [DOI: 10.1039/c4ra12565g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cu1−XCdXS2 thin films were deposited from precursor solutions having different concentrations of cation sources, by a single step solution process at room temperature.
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Affiliation(s)
- V. Nirmal Kumar
- Crystal Research Lab
- Department of Physics
- Anna University
- Chennai
- India
| | - R. Suryakarthick
- Crystal Research Lab
- Department of Physics
- Anna University
- Chennai
- India
| | - S. Karuppusamy
- Crystal Research Lab
- Department of Physics
- Anna University
- Chennai
- India
| | - Mukul Gupta
- UGC-DAE Consortium for Scientific Research
- Indore
- India
| | - Y. Hayakawa
- Research Institute of Electronics
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu
- Japan
| | - R. Gopalakrishnan
- Crystal Research Lab
- Department of Physics
- Anna University
- Chennai
- India
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34
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Vadivel M, Babu RR, Arivanandhan M, Ramamurthi K, Hayakawa Y. Role of SDS surfactant concentrations on the structural, morphological, dielectric and magnetic properties of CoFe2O4 nanoparticles. RSC Adv 2015. [DOI: 10.1039/c5ra01162k] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Schematic illustration of the synthesis of sodium dodecyl sulfate (SDS) added to cobalt ferrite (CoFe2O4) magnetic nanoparticles at various concentrations (0.04 and 0.08 M) and their morphological and magnetic characterizations.
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Affiliation(s)
- M. Vadivel
- Crystal Growth and Thin Film Laboratory
- Department of Physics
- Bharathidasan University
- Tiruchirappalli 620024
- India
| | - R. Ramesh Babu
- Crystal Growth and Thin Film Laboratory
- Department of Physics
- Bharathidasan University
- Tiruchirappalli 620024
- India
| | - M. Arivanandhan
- Nanomaterials Laboratory
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu 4328011
- Japan
| | - K. Ramamurthi
- Crystal Growth and Thin Film Laboratory
- Department of Physics and Nanotechnology
- Faculty of Engineering and Technology
- SRM University
- India
| | - Y. Hayakawa
- Nanomaterials Laboratory
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu 4328011
- Japan
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35
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Mahadevan M, Ramachandran K, Anandan P, Arivanandhan M, Bhagavannarayana G, Hayakawa Y. Crystal growth, structural, thermal and mechanical behavior of l-arginine 4-nitrophenolate 4-nitrophenol dihydrate (LAPP) single crystals. Spectrochim Acta A Mol Biomol Spectrosc 2014; 133:396-402. [PMID: 24967545 DOI: 10.1016/j.saa.2014.05.087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 05/12/2014] [Accepted: 05/25/2014] [Indexed: 06/03/2023]
Abstract
Single crystals of l-arginine 4-nitrophenolate 4-nitrophenol dihydrate (LAPP) have been grown successfully from the solution of l-arginine and 4-nitrophenol. Slow evaporation of solvent technique was adopted to grow the bulk single crystals. Single crystal X-ray diffraction analysis confirms the grown crystal has monoclinic crystal system with space group of P21. Powder X-ray diffraction analysis shows the good crystalline nature. The crystalline perfection of the grown single crystals was analyzed by HRXRD by employing a multicrystal X-ray diffractometer. The functional groups were identified from proton NMR spectroscopic analysis. Linear and nonlinear optical properties were determined by UV-Vis spectrophotometer and Kurtz powder technique respectively. It is found that the grown crystal has no absorption in the green wavelength region and the SHG efficiency was found to be 2.66 times that of the standard KDP. The Thermal stability of the crystal was found by obtaining TG/DTA curve. The mechanical behavior of the grown crystal has been studied by Vicker's microhardness method.
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Affiliation(s)
- M Mahadevan
- Department of Physics, Adhiparasakthi Engineering College, Melmaruvathur 603319, India; Department of Physics, SRM University, Vadapalani Campus, Chennai 600026, India
| | - K Ramachandran
- Department of Physics, SRM University, Vadapalani Campus, Chennai 600026, India.
| | - P Anandan
- Research Institute of Electronics, Shizuoka University, Johoku, Naka-Ku, Hamamatsu 432-8011, Japan; Department of Physics, Thiruvalluvar College of Engineering and Technology, Vandavasi 604505, India
| | - M Arivanandhan
- Research Institute of Electronics, Shizuoka University, Johoku, Naka-Ku, Hamamatsu 432-8011, Japan
| | - G Bhagavannarayana
- Materials Characterization Division, National Physical Laboratory, New Delhi 110012, India
| | - Y Hayakawa
- Research Institute of Electronics, Shizuoka University, Johoku, Naka-Ku, Hamamatsu 432-8011, Japan
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36
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Bhatt R, Bhattacharya S, Basu R, Ahmad S, Chauhan AK, Okram GS, Bhatt P, Roy M, Navaneethan M, Hayakawa Y, Debnath AK, Singh A, Aswal DK, Gupta SK. Enhanced thermoelectric properties of selenium-deficient layered TiSe(2-x): a charge-density-wave material. ACS Appl Mater Interfaces 2014; 6:18619-18625. [PMID: 25318103 DOI: 10.1021/am503477z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In the present work, we report on the investigation of low-temperature (300-5 K) thermoelectric properties of hot-pressed TiSe2, a charge-density-wave (CDW) material. We demonstrate that, with increasing hot-pressing temperature, the density of TiSe2 increases and becomes nonstoichiometric owing to the loss of selenium. X-ray diffraction, scanning electron microscopy, and transimission electron microscopy results show that the material consists of a layered microstructure with several defects. Increasing the hot-press temperature in nonstoichiometric TiSe2 leads to a reduction of the resistivity and enhancement of the Seebeck coefficient in concomitent with suppression of CDW. Samples hot-pressed at 850 °C exhibited a minimum thermal conductivity (κ) of 1.5 W/m·K at 300 K that, in turn, resulted in a figure-of-merit (ZT) value of 0.14. This value is higher by 6 orders of magnitude compared to 1.49 × 10(-7) obtained for cold-pressed samples annealed at 850 °C. The enhancement of ZT in hot-pressed samples is attributed to (i) a reduced thermal conductivity owing to enhanced phonon scattering and (ii) improved power factor (α(2)σ).
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Affiliation(s)
- Ranu Bhatt
- Technical Physics Division, ‡Astrophysical Sciences Division, ∥Solid State Physics Division, and ⊥Chemistry Division, Bhabha Atomic Research Centre , Mumbai 400 085, India
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37
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Bhatt R, Patel M, Bhattacharya S, Basu R, Ahmad S, Bhatt P, Chauhan AK, Navneethan M, Hayakawa Y, Singh A, Aswal DK, Gupta SK. Thermoelectric performance of layered SrxTiSe2 above 300 K. J Phys Condens Matter 2014; 26:445002. [PMID: 25244149 DOI: 10.1088/0953-8984/26/44/445002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this paper we report the thermoelectric performance of Sr intercalated TiSe(2) above 300 K. Refined x-ray diffraction, high resolution transmission electron microscopy and scanning electron microscopy images show well oriented polycrystalline grains along a (0 0 l) direction and layered growth of the sample. Intercalation of Sr in TiSe(2) shows an improved Seebeck coefficient (α) value without altering the polarity of the majority charge carrier. A drastic reduction in the thermal conductivity (κ) from 3.8 W m K(-1) to 1.2 W m K(-1) (at 650 K) was observed which is ascribed to the: (i) scattering of the phonon by natural layer interfaces, grain boundaries and lattice defects and (ii) rattling of intercalated Sr atoms among weakly bound TiSe(2) layers. This led to the maximum ZT of ~0.08 at 650 K for Sr(x)TiSe(2) (x > 0.1) which is almost twice as high as the parent TiSe(2).
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Affiliation(s)
- Ranu Bhatt
- Technical Physics Division, Bhabha Atomic Research Center, Mumbai-400 085, India
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38
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Mahadevan M, Magesh M, Ramachandran K, Anandan P, Arivanandhan M, Hayakawa Y. Synthesis, growth, crystal structure and characterization of a new organic NLO crystal: L-lysine 4-nitrophenolate monohydrate (LLPNP). Spectrochim Acta A Mol Biomol Spectrosc 2014; 130:416-422. [PMID: 24810028 DOI: 10.1016/j.saa.2014.04.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 03/10/2014] [Accepted: 04/06/2014] [Indexed: 06/03/2023]
Abstract
L-lysine 4-nitrophenolate monohydrate (LLPNP) has been synthesized and grown by solution growth method at room temperature using deionised water as a solvent. The crystal structure of the materials was solved by single crystal X-ray diffraction analysis and it was found that the material has orthorhombic system. The crystallinity of the grown crystals was studied by the powder X-ray diffraction analysis. Molecular structure of the grown crystal was investigated by 1H NMR spectroscopy. The various functional groups of the sample were identified by Fourier transform infrared and Fourier transform-Raman spectroscopic analyses. Thermal stability of the grown crystal has been studied by Thermogravimetric and Differential thermal (TG&DTA) analysis. The optical absorption of the grown crystals has been ascertained by UV-Vis-NIR absorption studies. Second harmonic generation (SHG) efficiency of the material has been determined by Kurtz and Perry technique and the efficiency was found to be 4.45 and 1.4 times greater than that of standard KDP and urea samples, respectively.
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Affiliation(s)
- M Mahadevan
- Department of Physics, Adhiparasakthi Engineering College, Melmaruvathur 603319, Tamil Nadu, India; Department of Physics, SRM University - Vadapalani Campus, Chennai 600026, Tamil Nadu, India
| | - M Magesh
- Centre for Crystal Growth, Sri Sivasubramaniya Nadar College of Engineering, Chennai 603110, India
| | - K Ramachandran
- Department of Physics, SRM University - Vadapalani Campus, Chennai 600026, Tamil Nadu, India
| | - P Anandan
- Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu 432-8011, Japan; Department of Physics, Thiruvalluvar College of Engineering and Technology, Vandavasi 604505, Tamil Nadu, India.
| | - M Arivanandhan
- Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu 432-8011, Japan
| | - Y Hayakawa
- Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu 432-8011, Japan
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39
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Kaneda T, Kawashima Y, Sasaki Y, Suemitsu M, Okada H, Hayakawa Y, Sakae T, Muraoka H, Hirahara N. Clinical application of parameteric X-ray in diagnostic imaging: Preliminary study. J Oral Maxillofac Surg 2014. [DOI: 10.1016/j.joms.2014.06.312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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40
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Dong J, Hayakawa Y, Kober C. Statistical iterative reconstruction for streak artefact reduction when using multidetector CT to image the dento-alveolar structures. Dentomaxillofac Radiol 2014; 43:20130373. [PMID: 24754471 DOI: 10.1259/dmfr.20130373] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES When metallic prosthetic appliances and dental fillings exist in the oral cavity, the appearance of metal-induced streak artefacts is not avoidable in CT images. The aim of this study was to develop a method for artefact reduction using the statistical reconstruction on multidetector row CT images. METHODS Adjacent CT images often depict similar anatomical structures. Therefore, reconstructed images with weak artefacts were attempted using projection data of an artefact-free image in a neighbouring thin slice. Images with moderate and strong artefacts were continuously processed in sequence by successive iterative restoration where the projection data was generated from the adjacent reconstructed slice. First, the basic maximum likelihood-expectation maximization algorithm was applied. Next, the ordered subset-expectation maximization algorithm was examined. Alternatively, a small region of interest setting was designated. Finally, the general purpose graphic processing unit machine was applied in both situations. RESULTS The algorithms reduced the metal-induced streak artefacts on multidetector row CT images when the sequential processing method was applied. The ordered subset-expectation maximization and small region of interest reduced the processing duration without apparent detriments. A general-purpose graphic processing unit realized the high performance. CONCLUSIONS A statistical reconstruction method was applied for the streak artefact reduction. The alternative algorithms applied were effective. Both software and hardware tools, such as ordered subset-expectation maximization, small region of interest and general-purpose graphic processing unit achieved fast artefact correction.
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Affiliation(s)
- J Dong
- 1 Department of Computer Science, Faculty of Engineering, Kitami Institute of Technology, Kitami, Japan
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41
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Karthikeyan R, Navaneethan M, Archana J, Thangaraju D, Arivanandhan M, Hayakawa Y. Shape controlled synthesis of hierarchical nickel sulfide by the hydrothermal method. Dalton Trans 2014; 43:17445-52. [DOI: 10.1039/c4dt02059f] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hierarchical structures of nickel sulfide have been grown by the hydrothermal method.
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Affiliation(s)
- R. Karthikeyan
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu, Japan
| | - M. Navaneethan
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu, Japan
| | - J. Archana
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu, Japan
| | - D. Thangaraju
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu, Japan
| | - M. Arivanandhan
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu, Japan
| | - Y. Hayakawa
- Graduate School of Science and Technology
- Shizuoka University
- Hamamatsu, Japan
- Research Institute of Electronics
- Shizuoka University
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42
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Anandan P, Omprakash M, Azhagurajan M, Arivanandhan M, Rajan Babu D, Koyama T, Hayakawa Y. Tailoring bismuth telluride nanostructures using a scalable sintering process and their thermoelectric properties. CrystEngComm 2014. [DOI: 10.1039/c4ce00837e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The size and phase of bismuth telluride nanocrystals were tailored using a sintering process, to enhance their thermoelectric properties.
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Affiliation(s)
- P. Anandan
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu 432-8011, Japan
- Department of Physics
- Thiruvalluvar College of Engineering and Technology
| | - M. Omprakash
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu 432-8011, Japan
- Graduate School of Science and Technology
- Shizuoka University
| | - M. Azhagurajan
- Frontier Research Institute for Interdisciplinary Sciences
- Tohoku University
- Sendai 980-8578, Japan
| | - M. Arivanandhan
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu 432-8011, Japan
| | - D. Rajan Babu
- Crystal Growth and Crystallography Division
- School of Advanced Sciences
- VIT University
- Vellore 632014, India
| | - T. Koyama
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu 432-8011, Japan
| | - Y. Hayakawa
- Research Institute of Electronics
- Shizuoka University
- Hamamatsu 432-8011, Japan
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43
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Anandan P, Arivanandhan M, Hayakawa Y, Babu DR, Jayavel R, Ravi G, Bhagavannarayana G. Investigations on the growth aspects and characterization of semiorganic nonlinear optical single crystals of L-histidine and its hydrochloride derivative. Spectrochim Acta A Mol Biomol Spectrosc 2013; 121:508-513. [PMID: 24291426 DOI: 10.1016/j.saa.2013.11.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 11/04/2013] [Accepted: 11/05/2013] [Indexed: 06/02/2023]
Abstract
Semiorganic single crystals of l-histidine and l-histidine hydrochloride monohydrate have been obtained in a single solution prepared from the mixture of l-histidine and hydrochloric acid in 1:2M ratio. Growth aspects of the single crystals have been discussed along with characterization studies. Crystal system and lattice parameters have been identified by X-ray diffraction analyses. It has been observed that the grown crystals possess orthorhombic system but with different set of lattice parameters. Presence of various functional groups has been identified and formation of two different crystals has been confirmed by Fourier transform infrared spectral analyses and FT-Raman studies. Linear and nonlinear optical properties have been studied by UV-Vis spectral analyses and Kurtz-Perry powder technique respectively. The thermal stability of the grown crystals was determined by thermal analyses. From the characterization studies it is found that both the crystals are useful for second harmonic generation applications.
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Affiliation(s)
- P Anandan
- Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka 432-8011, Japan; Department of Physics, Thiruvalluvar College of Engineering and Technology, Arunachala City-Ponnur Hills, Vandavasi 604 505, India.
| | - M Arivanandhan
- Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka 432-8011, Japan
| | - Y Hayakawa
- Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu, Shizuoka 432-8011, Japan
| | - D Rajan Babu
- Crystal Growth and Crystallography Division, School of Advanced Sciences, VIT University, Vellore 632 014, India
| | - R Jayavel
- Crystal Growth Centre, Anna University, Chennai 600 025, India
| | - G Ravi
- Department of Physics, Alagappa University, Karaikudi 630 003, India
| | - G Bhagavannarayana
- Materials Characterization Division, National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110 012, India
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44
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Arun Kumar R, Arivanandhan M, Dhanasekaran R, Hayakawa Y. Growth and characterization of a novel nonlinear optical borate crystal--yttrium calcium borate (YCB). Spectrochim Acta A Mol Biomol Spectrosc 2013; 110:391-394. [PMID: 23583874 DOI: 10.1016/j.saa.2013.03.069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 03/15/2013] [Accepted: 03/16/2013] [Indexed: 06/02/2023]
Abstract
A new nonlinear optical single crystal yttrium calcium borate Y2CaB10O19 (YCB) was grown for the first time from its melt. The starting materials were prepared by the solid-state reaction method. The melting point of the synthesized material was identified to be 967 °C. YCB crystal exhibits monoclinic crystal structure with the space group C2. The crystalline perfection of the grown YCB crystal was found to be good. From the UV-VIS-NIR studies, the lower cutoff wavelength of the crystal occurs below 200 nm. The functional groups of the grown crystal were assigned using the FTIR data. The second harmonic generation (SHG) of the YCB crystal was observed using a Nd:YAG laser with a fundamental wavelength of 1064 nm. The laser damage threshold value of the YCB crystal was found to be very high - 10.5 GW/cm(2).
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Affiliation(s)
- R Arun Kumar
- Research Institute of Electronics, Shizuoka University, Hamamatsu, Japan.
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Kanchana P, Elakkina Kumaran A, Hayakawa Y, Sekar C. Effect of divalent metal ion impurities (Ba²⁺, Ca²⁺ and Mg²⁺) on the growth, structural and physical properties of KAP crystals. Spectrochim Acta A Mol Biomol Spectrosc 2013; 103:187-192. [PMID: 23261612 DOI: 10.1016/j.saa.2012.10.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 10/06/2012] [Accepted: 10/10/2012] [Indexed: 06/01/2023]
Abstract
Single crystals of potassium hydrogen phthalate (KAP), a semi-organic compound, have been grown by slow evaporation method at room temperature from aqueous solution in the presence of divalent metal ionic impurities Ba(2+), Ca(2+) and Mg(2+). Elemental analysis by inductively coupled plasma optical emission spectroscopy (ICP-OES) proves the incorporation of these impurities into the grown crystals. Powder X-ray diffraction studies confirmed the phase formation and metal ions doping into KAP crystals. Thermogravimetric-differential thermal analysis (TG-DTA) shows the onset decomposition temperatures to be 255, 238, 251 and 250°C for pure, Ba(2+), Ca(2+) and Mg(2+) doped KAP crystals respectively. Microhardness studies revealed that all the three doped crystals have improved hardness values than that of undoped KAP crystal. Ca-KAP crystal exhibited the highest second harmonic generation (SHG) conversion efficiency of 16 mV with the output power of nearly half of the standard potassium dihydrogen phosphate (KDP) crystal. The grown crystals were also subjected to Fourier transform infrared (FTIR) spectroscopy, ultra violet-visible-near infrared (UV-NIR) spectroscopy studies and dielectric studies. Among the three investigated metal ion impurities, Ca(2+) ion seem to have positive influence on the growth, mechanical, thermal, dielectric and SHG characteristics of KAP which makes it suitable for applications.
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Affiliation(s)
- P Kanchana
- Department of Bioelectronics & Biosensors, Alagappa University, Karaikudi 630 003, TN, India
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Navaneethan M, Archana J, Hayakawa Y. Morphological evolution of monodispersed ZnO nanorods to 3 dimensional hierarchical flowers by hydrothermal growth. CrystEngComm 2013. [DOI: 10.1039/c3ce41601a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lavanya N, Radhakrishnan S, Sekar C, Navaneethan M, Hayakawa Y. Fabrication of Cr doped SnO2 nanoparticles based biosensor for the selective determination of riboflavin in pharmaceuticals. Analyst 2013; 138:2061-7. [DOI: 10.1039/c3an36754a] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Hayakawa Y, Yanagi H, Hara S, Amagai H, Endo K, Hamaguchi H, Tomura S. Genetic and environmental factors affecting peak bone mass in premenopausal Japanese women. Environ Health Prev Med 2012; 6:177-83. [PMID: 21432258 DOI: 10.1007/bf02897967] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2001] [Accepted: 06/13/2001] [Indexed: 11/29/2022] Open
Abstract
The purpose of this study was to examine the relationships between peak bone mass and genetic and environmental factors. We measured whole-body bone mineral density (BMD), lumbar spine BMD, and radius BMD with dual-energy X-ray absorptiometry (DXA) and analyzed eight genetic factors: vitamin D receptor (VDR)-3', VDR-5', estrogen receptor (ER), calcitonin receptor (CTR), parathyroid hormone (PTH), osteocalcin (OC), apolipoprotein E (ApoE), and fatty acid binding protein 2 (FABP2) allelic polymorphisms using polymerase chain reaction-restriction fragment length polymorphisms (PCR-RFLPs). We also surveyed menstrual history, food intake, and history of physical activity using questionnaires.After adjusting for age, body mass index (BMI), current smoking status, current Ca intake, alcohol intake, menoxenia, and physical activity, the mean BMD in subjects with the HH/Hh genotype was significantly higher than that of subjects with the hh genotype for whole-body BMD (mean±SD, 1.20±0.10 vs. 1.18±0.09 g/cm(2); HH/Hh vs. hh, p=0.04) and at lumbar spine BMD (mean±SD, 1.18±0.14 vs. 1.14±0.12 g/cm(2); HH/Hh vs. hh, p=0.02) in OC allelic polymorphism. Furthermore, the results of multiple regression analyses taking the 8 genetic factors plus the 7 environmental factors listed above into account showed that the strongest factor contributing to BMD was BMI at any site (whole-body and lumbar BMD p<0.0001, radius BMD p=0.0029). In addition, OC polymorphism (p=0.0099), physical activity (p=0.0245), menoxenia (p=0.0384), and PTH polymorphism (p=0.0425) were independent determinants for whole-body BMD, and OC polymorphism (p=0.0137) and physical activity (p=0.0421) were independent determinants for lumbar BMD and radius BMD, respectively.
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Affiliation(s)
- Y Hayakawa
- Institute of Community Medicine, University of Tsukuba, Tennoudai 1-1-1, 305-8575, Tsukuba-city, Ibaraki, Japan
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Sakamoto K, Hikiba Y, Nakagawa H, Hirata Y, Hayakawa Y, Kinoshita H, Nakata W, Sakitani K, Takahashi R, Akanuma M, Kamata H, Maeda S. Promotion of DNA repair by nuclear IKKβ phosphorylation of ATM in response to genotoxic stimuli. Oncogene 2012; 32:1854-62. [PMID: 22614018 DOI: 10.1038/onc.2012.192] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Ataxia-telangiectasia mutated (ATM) is one of the key molecules involved in the cellular response to DNA damage. A portion of activated ATM is exported from the nucleus into the cytoplasm, where it activates the I kappa B kinase/nuclear factor kappa B (IKK/NF-κB) signaling pathway. It has been thought that activated IKKβ, which is a critical kinase for NF-κB activation, generally resides in the cytoplasm and phosphorylates cytoplasmic downstream molecules, such as IκBα. Here, we identified a new role for IKKβ during the response to DNA damage. ATM phosphorylation in response to alkylating agents consisted of two phases: the early phase (up to 3 h) and late phase (after 6 h). A portion of the activated IKKβ generated during the DNA damage response was found to translocate into the nucleus and directly phosphorylate ATM in the late phase. Furthermore, the phosphorylation of ATM by nuclear IKKβ was suggested to promote DNA repair. In parallel, activated IKKβ induced classical NF-κB activation and was involved in anti-apoptosis. Our findings define the function of IKKβ during the response to DNA damage, which promotes cell survival and DNA repair, and maintains cellular homeostasis.
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Affiliation(s)
- K Sakamoto
- Division of Gastroenterology, Institute for Adult Diseases, Asahi Life Foundation, Tokyo, Japan
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Nonomura T, Wen C, Kato A, Isobe K, Kubota Y, Nakamura T, Yamashita M, Hayakawa Y, Tatsuoka H. Thermoelectric properties of group VI metal silicide semiconductors. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.phpro.2011.01.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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