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Shaislamov, U.,Krishnamoorthy, K.,Kim, S.J.,Abidov, A.,Allabergenov, B.,Kim, S.,Choi, S.,Suresh, R.,Ahmed, W.M.,Lee, H.J. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.4
<P>In this study, we demonstrated a facile fabrication of highly stable CuO/ZnO nanorod-nanobranch based photocathode for photoelectrochemical hydrogen generation. Primary CuO nanorods (serving as a trunk) were synthesized via direct thermal oxidation of Cu nanorods that were grown by a template assisted electrodeposition method. Secondary ZnO nanobranches were uniformly grown on the entire surface of CuO nanorods via hydrothermal method. The prepared CuO/ZnO nanorod-nanobranch photoelectrode demonstrated an extremely high stability of 90% during a long term stability measurement. Morphological, optical and electrochemical characterizations have been carried out in order to understand the effects of ZnO nanorod branches on the overall electrochemical performance of the electrode. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.</P>
FERROELECTRIC NANOTUBE (FNT) CAPACITORS FOR HIGH-DENSITY SEMICONDUCTOR MEMORIES
SHAISLAMOV, U.,SEO, B.,LEE, S.,PARK, B.,KIM, I.,HONG, S.,YANG, B. Taylor Francis 2006 Integrated ferroelectrics Vol.81 No.1
<P>Ferroelectric high-density memories (> 64 Mb) using the integrated cells of size less than 0.l um 2 will be more increased in upcoming ubiquitous era. Thus in this report we suggest fabrication of 3D nanotube capacitors for high-density semiconductor memories. Herein we discuss preparation of Pt and BLT nanotubes as an initial step toward 3D nanotube capacitors. We have used simple and convenient method, wetting of pore walls of porous templates. Templates could be either macroporous Si or nanoporous alumina. In future, characteristics of Pt and BLT nanotubes by PFM and TEM will be performed in order to make next steps toward 3D nanotube capacitors.</P>
Fabrication of PZT Tubular Structures by a Template-wetting Process
Shaislamov, U.A.,Hong, S.K.,Yang, B. The Korean Ceramic Society 2007 한국세라믹학회지 Vol.44 No.5
Nanotubes and microtubes of ferroelectric lead zirconate titanate (PZT) were synthesized by means of a simple and convenient process called a template-wetting process. Nanoporous alumina and macroporous Si were used as template materials to fabricate the corresponding tubes. For the improvement of the wetting properties of the wetting solution, the PZT solution was mixed with a polymer. The polymer was removed completely during annealing. The grain growth processes of the PZT nanotubes during baking and furnace annealing were examined by means of field emission electron microscope (FE-SEM) and X-ray diffractometry (XRD).
Lanthanum-substituted bismuth titanate nanotubes
Shaislamov, U.,Yang, J.M.,Yang, B. North-Holland 2012 Physica E, Low-dimensional systems & nanostructure Vol.44 No.7
Ferroelectric (Bi<SUB>1-x</SUB>La<SUB>x</SUB>)<SUB>4</SUB>Ti<SUB>3</SUB>O<SUB>12</SUB> (BLT) nanotubes doped with 0.85at% La were fabricated with the aim of developing an alternative to conventional technologies. A technique based on the wetting of a polymeric metal-organic source was used in the fabrication process for ferroelectric nanotubes. This technique involved the use of porous alumina produced by anodic aluminum oxidation as a template. It was demonstrated that these nanotubes can be used for the large-scale fabrication. X-ray diffraction measurements and transmission electron microscopy studies show that the crystal grains in the BLT nanotubes with a wall thickness of approximately 20nm have a ferroelectric BLT phase with a random orientation and a grain diameter of 10nm to 60nm. Promising electrical properties of the BLT nanotubes for electronic devices could be confirmed in I-V measurements. The measured leakage current for a BLT nanotube with a length of approximately 2.5μm at an applied voltage of 2V was approximately 2.5x10<SUP>-11</SUP>A.
CdS-sensitized TiO<sub>2</sub> photoelectrodes for quantum dots-based solar cells
Shaislamov, Ulugbek,Kim, Hyun,Yang, Bee Lyong Cambridge University Press (Materials Research Soc 2013 Journal of materials research Vol.28 No.3
<▼1><B>Abstract</B><P/></▼1><▼2><P>Hydrothermally grown TiO2 nanorod (NR) photoelectrodes were prepared by sensitizing CdS quantum dots to improve visible light activity of the TiO2. The CdS-sensitized photoelectrodes were heat-treated to obtain enhanced performance of the photoelectrode under visible light. Furthermore, performance of the TiO2 NR-based photoanodes was compared with those made of TiO2 nanotubes (NTs). Photocurrent measurement and overall cell efficiency of the NR-based solar cells showed higher efficiency compared to NT-based solar cell.</P></▼2>
BLT and Pt Nanotubes for High-Density Semiconductor Memories
Shaislamov U. A.,B. Yang 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.3
In this work, fabrication of BLT and Pt nanotubes for application in ferroelecric nanotube capacitors is reported. Porous alumina templates were wetted with precursor solutions containing polymeric sources. Crystallization and nucleation of the nanotubes were analyzed by means of XRD and FE-SEM techniques. RTA and FTA effects on nucleation and growth of BLT and Pt nanotubes are discussed.
Shaislamov, U.,Yang, J.M.,Yoo, J.H.,Seo, H.S.,Park, K.J.,Choi, C.J.,Hong, T.E.,Yang, B. Pergamon Press 2008 Microelectronics and reliability Vol.48 No.10
The electron holography and chemical etching delineation techniques were successfully employed to assess two-dimensional (2D) dopant profiles in semiconductor devices. The results obtained from both techniques with the same specimen were precisely compared and discussed in order to evaluate the performance limits of these techniques. It was demonstrated that both techniques are very effective in obtaining reliable 2D dopant profiles in nanodevice.
Growth of CuO/ZnO Nanobranched Photoelectrode with Enhanced Stability for Solar Hydrogen Generation
Shaislamov, Ulugbek,Krishnamoorthy, Karthikeyan,Kim, Sang Jae,Choi, Sooseok,Chun, Wongee,Lee, Heon-Ju American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>Vertically aligned p-CuO nanorods were synthesized by direct oxidation of metallic Cu nanorods grown on Cu substrate by facile template assisted electrodepositionmethod. The photoelectrochemical stability of the CuO nanorods photocathode was greatly enhanced by ZnO nanorod branches that were uniformly grown along the entire surface of the nanorods with various densities. Long-term stability measurement showed that as prepared CuO/ZnO nanorod/nanobranch photoelectrode to have an extremely high stability of 98%. Morphological, optical and electrochemical characterizations have been carried out in order to examine the effects of ZnO nanorod branches density on the stability and overall electrochemical performance of the electrode.</P>
Quantitative Analysis of Void Morphology in Fe-40 wt.%Ni Alloy by Electron Holography
Ulugbek Shaislamov,양준모,유정호,유정훈,유대황,신기삼,이종훈,양비룡,나영상,조경식 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.6
In this paper, we briefly report on a detailed investigation of the morphology of voids in the Fe-40 wt.%Ni alloy using the electron holography technique. By analyzing the phase shift across the voids, we could obtain visual information on their morphology. Moreover, the obtained thickness profiles of the voids allowed us to measure quantitatively their depth and width. The obtained results are very important for further investigations of the 3-dimensional (3D) morphology of void-type defects in the material. In this paper, we briefly report on a detailed investigation of the morphology of voids in the Fe-40 wt.%Ni alloy using the electron holography technique. By analyzing the phase shift across the voids, we could obtain visual information on their morphology. Moreover, the obtained thickness profiles of the voids allowed us to measure quantitatively their depth and width. The obtained results are very important for further investigations of the 3-dimensional (3D) morphology of void-type defects in the material.