The Experts below are selected from a list of 9282 Experts worldwide ranked by ideXlab platform
Ionut Enculescu - One of the best experts on this subject based on the ideXlab platform.
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Zinc oxide Electroless Deposition on electrospun PMMA fiber mats
Materials Letters, 2015Co-Authors: Nicoleta Preda, Alexandru Evanghelidis, Monica Enculescu, Camelia Florica, Ionut EnculescuAbstract:Abstract ZnO crystallites were grown by Electroless Deposition on poly(methyl methacrylate) (PMMA) fiber mats prepared by an electrospinning technique. The Electroless Deposition involves three steps: sensitization, activation and Deposition, which were performed by subsequently dipping the PMMA fiber mats in the appropriate solutions. After the Deposition the PMMA fibers are uniformly coated with ZnO prisms which show hexagonal wurtzite structure and optical signatures (band-gap value and emission bands) typical for this semiconductor. By combining Electroless Deposition and electrospinning, different semiconductor coated polymer fibers can be obtained for a wide range of applications. Both methods are appropriate for large scale production, being scalable, cheap, efficient and suitable for large-area covering techniques.
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Micropatterned ZnO rod arrays prepared by Au‐catalyzed Electroless Deposition
physica status solidi (RRL) - Rapid Research Letters, 2014Co-Authors: Camelia Florica, Nicoleta Preda, Monica Enculescu, Ionut EnculescuAbstract:Micropatterned ZnO was synthesized by an Electroless Deposition process using Au stripes as catalytic surfaces. The Au-patterned electrodes were prepared on SiO2/Si wafers using photolithography. The site-selective Deposition of patterned ZnO hexagonal rod arrays is confirmed by scanning electron microscopy. The ZnO micropatterned surface revealed a conversion of wettability from hydrophilic to superhydrophobic depending on the Deposition reaction param- eters. The electrical measurements carried out at room temperature before and after exposure to ammonia vapors of the patterned ZnO arrays show a resistance variation with exposure time. Highly reproducible, easy scalable and low-cost, photolithography and Electroless Deposition techniques could provide a facile approach to fabricate functionalized micropatterns, for a wide range of applications. (© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Tetsuya Osaka - One of the best experts on this subject based on the ideXlab platform.
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Area selective formation of magnetic nanodot arrays on Si wafer by Electroless Deposition
Journal of Magnetism and Magnetic Materials, 2005Co-Authors: J. Kawaji, Takayuki Homma, F. Kitaizumi, H. Oikawa, Daisuke Niwa, Tetsuya OsakaAbstract:Abstract Electroless Deposition process for fabricating magnetic dot arrays was studied. A patterned Si substrate with a SiO 2 resist was produced by processes combined with electron-beam lithography and reactive ion etching. By immersing the patterned Si substrate into a CoNiP Electroless Deposition bath, CoNiP was deposited only into the patterned pores, demonstrating a satisfactory area selectivity of the Deposition. Excellent uniformity on the CoNiP Deposition into the patterned pores with diameter less than 100 nm and high aspect ratio (>5) was achieved by applying chemical activation processes using a Pd solution prior to the Deposition. The CoNiP dot arrays exhibited higher perpendicular squareness ratio than that of CoNiP continuous film and showed a clear magnetization state at DC-magnetized state, which originated from the shape anisotropy caused by high aspect ratio of the dot patterns.
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Direct physical casting of the mesostructure in lyotropic liquid crystalline media by Electroless Deposition confirmation by TEM
Electrochemical and Solid-State Letters, 2005Co-Authors: Yusuke Yamauchi, Tetsuya Osaka, Tokihiko Yokoshima, Toshiyuki Momma, Kazuyuki KurodaAbstract:Nickel particles with a highly ordered mesostructure are prepared by Electroless Deposition of Ni salts dissolved in aqueous domains of lyotropic liquid crystalline (LLC) media made of a nonionic surfactant (Brij 56) at a high concentration. The mesostructure inside the Ni particles after the Electroless Deposition has a macroscopic alignment of mesochannels derived from the LLC media which are composed of crystalline domains on a micrometer scale. It is proved that the arrangements of rod-like self-assemblies in the LLC indeed work as a scaffold to direct the grain growth of Ni. This is the first direct evidence of direct physical casting from LLC. (c) 2005 The Electrochemical Society.
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Microfabrication of electro- and Electroless-Deposition and its application in the electronic field
Surface & Coatings Technology, 2003Co-Authors: Tetsuya Osaka, Nao Takano, Tokihiko YokoshimaAbstract:Abstract The recent topics of our researches concerned with the electrochemical fabrication process of highly functionalized metal thin films and minute structures are reviewed. We present three topics; the soft magnetic materials of Co alloys by electro- and Electroless-plating, the micro-dot formation by Ni Electroless Deposition, and fabrication of barrier layer on SiO2 by Electroless Deposition for ULSI technology. The magnetic property of electrodeposited CoNiFe film was deteriorated by the co-Deposition of a small amount of sulfur, whereas the carbon co-Deposition improved resistivity of the film. The Electroless soft magnetic materials were also proposed for future extremely high-density recording system. As the fine dot formation, the Electroless Deposition processes for producing fine metal structures were demonstrated. For advanced nano-scale patterning technology, an organic monolayer directly grafted to the Si surface was applied to a novel process of selective metal Deposition. Another type of organic monolayer, a self-assembled monolayer of organosilane, was also utilized as an adhesive/catalytic layer for fabrication of a diffusion barrier layer on SiO2 for future ULSI technology.
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An in Situ Study on Electroless-Deposition Process by Scanning Tunneling Microscopy
Journal of The Electrochemical Society, 1992Co-Authors: Takayuki Homma, Takuya Yamazaki, Tetsuya OsakaAbstract:The Electroless-Deposition process of NiP film was studied using in situ scanning tunneling microscopy (STM). By potentiostatic control of the substrate electrode during the STM scan, the initial Deposition process of NiP was observed, revealing features that differ from those of the electroDeposition process, which was also observed in situ. The growth process over the same area during the progress of Deposition was also observed sequentially. The results obtained suggest that the Electroless-Deposition process of NiP is a result of continuous nucleation of grains and their three-dimensional growth
Camelia Florica - One of the best experts on this subject based on the ideXlab platform.
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Zinc oxide Electroless Deposition on electrospun PMMA fiber mats
Materials Letters, 2015Co-Authors: Nicoleta Preda, Alexandru Evanghelidis, Monica Enculescu, Camelia Florica, Ionut EnculescuAbstract:Abstract ZnO crystallites were grown by Electroless Deposition on poly(methyl methacrylate) (PMMA) fiber mats prepared by an electrospinning technique. The Electroless Deposition involves three steps: sensitization, activation and Deposition, which were performed by subsequently dipping the PMMA fiber mats in the appropriate solutions. After the Deposition the PMMA fibers are uniformly coated with ZnO prisms which show hexagonal wurtzite structure and optical signatures (band-gap value and emission bands) typical for this semiconductor. By combining Electroless Deposition and electrospinning, different semiconductor coated polymer fibers can be obtained for a wide range of applications. Both methods are appropriate for large scale production, being scalable, cheap, efficient and suitable for large-area covering techniques.
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Micropatterned ZnO rod arrays prepared by Au‐catalyzed Electroless Deposition
physica status solidi (RRL) - Rapid Research Letters, 2014Co-Authors: Camelia Florica, Nicoleta Preda, Monica Enculescu, Ionut EnculescuAbstract:Micropatterned ZnO was synthesized by an Electroless Deposition process using Au stripes as catalytic surfaces. The Au-patterned electrodes were prepared on SiO2/Si wafers using photolithography. The site-selective Deposition of patterned ZnO hexagonal rod arrays is confirmed by scanning electron microscopy. The ZnO micropatterned surface revealed a conversion of wettability from hydrophilic to superhydrophobic depending on the Deposition reaction param- eters. The electrical measurements carried out at room temperature before and after exposure to ammonia vapors of the patterned ZnO arrays show a resistance variation with exposure time. Highly reproducible, easy scalable and low-cost, photolithography and Electroless Deposition techniques could provide a facile approach to fabricate functionalized micropatterns, for a wide range of applications. (© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Pethaiyan Jeevanandam - One of the best experts on this subject based on the ideXlab platform.
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Electroless Deposition of silver on synthesized calcite via surface modification
Applied Surface Science, 2009Co-Authors: Chamarthi K. Srikanth, Pethaiyan JeevanandamAbstract:Abstract Metallic silver was deposited on the surface of synthesized calcite via a simple Electroless Deposition method. Calcite with cubic morphology was prepared first by homogeneous precipitation and it was subsequently surface modified using ammonium oxalate. The Electroless Deposition was carried out using formaldehyde as the reducing agent and silver nitrate as the silver source. Both calcite and the silver deposited calcite were characterized by different techniques. Surface modification of calcite with ammonium oxalate is necessary for the Deposition of silver and the size of the deposited silver particles could be controlled by changing the Deposition parameters such as concentration of the reagents and the Deposition time. Lower concentration of silver ions (e.g. 0.01 M AgNO3) and shorter Deposition times (e.g. 30 min) lead to the formation of silver nanoparticles on calcite.
Nicoleta Preda - One of the best experts on this subject based on the ideXlab platform.
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Zinc oxide Electroless Deposition on electrospun PMMA fiber mats
Materials Letters, 2015Co-Authors: Nicoleta Preda, Alexandru Evanghelidis, Monica Enculescu, Camelia Florica, Ionut EnculescuAbstract:Abstract ZnO crystallites were grown by Electroless Deposition on poly(methyl methacrylate) (PMMA) fiber mats prepared by an electrospinning technique. The Electroless Deposition involves three steps: sensitization, activation and Deposition, which were performed by subsequently dipping the PMMA fiber mats in the appropriate solutions. After the Deposition the PMMA fibers are uniformly coated with ZnO prisms which show hexagonal wurtzite structure and optical signatures (band-gap value and emission bands) typical for this semiconductor. By combining Electroless Deposition and electrospinning, different semiconductor coated polymer fibers can be obtained for a wide range of applications. Both methods are appropriate for large scale production, being scalable, cheap, efficient and suitable for large-area covering techniques.
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Micropatterned ZnO rod arrays prepared by Au‐catalyzed Electroless Deposition
physica status solidi (RRL) - Rapid Research Letters, 2014Co-Authors: Camelia Florica, Nicoleta Preda, Monica Enculescu, Ionut EnculescuAbstract:Micropatterned ZnO was synthesized by an Electroless Deposition process using Au stripes as catalytic surfaces. The Au-patterned electrodes were prepared on SiO2/Si wafers using photolithography. The site-selective Deposition of patterned ZnO hexagonal rod arrays is confirmed by scanning electron microscopy. The ZnO micropatterned surface revealed a conversion of wettability from hydrophilic to superhydrophobic depending on the Deposition reaction param- eters. The electrical measurements carried out at room temperature before and after exposure to ammonia vapors of the patterned ZnO arrays show a resistance variation with exposure time. Highly reproducible, easy scalable and low-cost, photolithography and Electroless Deposition techniques could provide a facile approach to fabricate functionalized micropatterns, for a wide range of applications. (© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)