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Embedding epitaxial VO_(2)film with quality metal-insulator transition to SAW devices

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Journal of Advanced Dielectrics 2022年第5期12卷 53-59页

作者： M.E.Kutepov §,G.Ya.Karapetyan T.A.Minasyan V.E.Kaydashev I.V.Lisnevskaya K.G.Abdulvakhidov A.A.Kozmin E.M.Kaidashev Laboratory of Nanomaterials Southern Federal University200/1 Stachki Ave.344090 Rostov-on-DonRussia Department of Chemistry Southern Federal University7 Zorge St.344090 Rostov-on-DonRussia Smart Materials Research Institute Southern Federal University178/24 Sladkova St.344090 Rostov-on-DonRussia

Epitaxial VO_(2)films grown by pulsed laser deposition(pld)method with superior phase transition related switching characteristics are successfully embedded to SAW devices using concept of the“impedance loaded SAW sensor”.A resistance of VO2 sensor abruptly drops from 0.7 MΩto 90Ωwhen it is heated above~65℃and shows a narrow hysteresis loops when switching.Two designs of SAW devices are examined in which RF signal is reflected back from interdigital transducer(IDT)or a surface acoustic waves(SAW)is transferred through a coupler and the RF response is altered 2 and 3 times correspondingly upon the phase transition in VO2.In the proposed devices with external load,a SAW does not propagate via VO2 film and therefore is not attenuated which is beneficiary for wireless applications.Additionally,a SAW phase shift as great as 50°is induced to the SAW transferred through the coupler due to the phase transition in VO2.The proposed approach may boost the development of remotely controlled autonomous sensors,including those based on VO2 metamaterials and hybrid plasmonic structures for near IR/middle IR and sub-THz/THz applications.

关键词： Surface acoustic wave SAW pulsed laser deposition pld VO_(2) epitaxial film.

ERCP for the treatment of bile leak after partial hepatectomy and fenestration for symptomatic polycystic liver disease

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World Journal of Gastroenterology 2012年第28期18卷 3705-3709页

作者： Nayantara Coelho-Prabhu David M Nagorney Todd H Baron Mayo Clinic College of Medicine Rochester MN 55905 United States

AIM: To describe endoscopic treatment of bile leaks in these patients and to identify risk factors in these patients which can predict the development of bile leaks. METHODS: Retrospective case-control study examining consecutive patients who underwent partial hepatectomy for polycystic liver disease (pld) and developed a postoperative bile leak managed endoscopically over a ten year period. Each case was matched with two controls with pld who did not develop a postoperative bile leak. RESULTS: Ten cases underwent partial hepatectomy with fenestration for symptoms including abdominal distention, pain and nausea. Endoscopic retrograde cholangiopancreatography (ERCP) showed anatomic abnormalities in 1 case. A biliary sphincterotomy was performed in 4 cases. A plastic biliary stent was placed with the proximal end at the site of the leak in 9 cases; in 1 case two stents were placed. The overall success rate of ERCP to manage the leak was 90%. There were no significant differences in age, gender, comorbidities, duration of symptoms, history of previous surgery or type of surgery performed between cases and controls. CONCLUSION: ERCP with stent placement is safe and effective for management of post-hepatectomy bile leak in patients with pld.

关键词：切除术症状治疗开窗肝持续时间 pld 危险因素

Investigation on Bioactivity of Titanium DioXide Thin Films Fabricated by Electron Cyclotron Resonance Plasma Aided Pulsed Laser Deposition

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Plasma Science and Technology 2009年第4期11卷 477-480页

作者：束奇伟钟晓霞吴嘉达孙剑 Kostya(Ken) OSTRIKOV Department of Physics Shanghai Jiao Tong University Department of Optical Science and Engineering Fudan University Plasma Nanoscience Center Australia(PNCA) CSIRO Materials Science and Engineering

Titanium dioxide thin films with a rutile crystallinite size around 20 nm were fabri- cated by pulsed laser deposition （pld） aided with an electron cyclotron resonance （ECR） plasma. With annealing treatment, the crystal size of the rutile crystallinite increased to 100 nm. The apatite-forming ability of the films as deposited and after annealing was investigated in a kind of simulated body fluid with ion concentrations nearly equal to those of human blood plasma. The results indicate that ECR aided pld is an effective way both to fabricate bioactive titanium dioxide thin films and to optimize the bioactivity of titanium dioxide, with both crystal size and defects of the film taken into account.

关键词： titanium dioxide pld bioactivity surface defect crystal size

Improvement of Surface Morphology of Yttrium-Stabilized Zirconia Films Deposited by Pulsed Laser Deposition on Rolling Assisted Biaxially Textured Substrate Tapes

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Chinese Physics Letters 2015年第11期32卷 101-105页

作者：王梦麟刘林飞李贻杰 Department of Physics and Astronomy Shanghai Jiao Tong University

The surface morphology of buffer layer yttrium-stabilized zirconia （YSZ） of YBa2CuaO7-σ （YBCO） high temperature superconducting films relies on a series of controllable experimental parameters. In this work, we focus on the influence of pulsed laser frequency and target crystalline type on surface morphology of YSZ films deposited by pulsed laser deposition （pld） on rolling assisted biaxially textured substrate tapes. Usually two kinds of particles are observed in the YSZ layer： randomly distributed ones on the whole film and self-assembled ones along grain boundaries. SEM images are used to prove that particles can be partly removed when choosing dense targets of single crystalline. Lower frequency of pulsed laser also contributes to a smoother film surface. TEM images are used to view the crystalline structure of thin film. Thus we can obtain a basic understanding of how to prepare a particle-free YSZ buffer layer for YBCO in optimized conditions using pld. The YBCO layer with nice structure and critical current density of around 5 MA/cm2 can be reached on smooth YSZ samples.

关键词： YSZ Improvement of Surface Morphology of Yttrium-Stabilized Zirconia Films Deposited by Pulsed Laser Deposition on Rolling Assisted Biaxially Textured Substrate Tapes pld

Optical and Micro-Structural Properties of ZnO Thin Films Grown on Silicon Substrate by Pulsed Laser Deposition

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Journal of Rare Earths 2006年第Z1期24卷 26-28页

作者： He Jianting Zhuang Huizhao Xue Chengshan Tian Deheng Wu Yuxin Xue Shoubin Hu Lijun Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China Institute of Semiconductor College of Physics and Electronics Shandong Normal University Jinan 250014 China

ZnO thin films were deposited on n-Si (111) at various substrate temperatures and oxygen pressures by pulsed laser deposition (pld) using a Nd∶YAG laser with the wavelength of 1064 nm. X-ray diffraction (XRD), photoluminescence (PL), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to analyze the microstructure, optical property and morphology of the ZnO thin films. A comparatively optimal crystallized ZnO thin film was obtained at the substrate temperature of 600 ℃ in oxygen pressure of 50 mTorr. The intensity of the luminescence strongly depends on the stoichiometry of the film as well as the crystalline quality.

关键词： pld ZnO substrate temperature oxygen pressure

Effect of ambient oxygen pressure on structural, optical and electrical properties of SnO_2 thin films

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Rare Metals 2006年第6期25卷 693-696页

作者： ZHAO Songqing ZHOU Yueliang WANG Shufang ZHAO Kun HAN Peng Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China Department of Mathematics and Physics China University of Petroleum Beijing 102249 China

PolycrystaUine SnO2 thin films were deposited on sapphire substrates at 450℃ under different ambient oxygen pressures by pulsed laser deposition technique. The effect of ambient oxygen pressure on the structural, optical and electrical properties of SnO2 thin films was studied. X-my diffraction and Hall measurements show that increasing the ambient oxygen pressure can improve crystallization of the films and decrease resistivity of the films. A violet emission peak centered at 409 nm was observed from photoluminescence measurements for SnO2 films under deposition ambient oxygen pressure above 5 Pa, which is related to the improvement of crystalline of the films.

关键词： tin oxide pulsed laser deposition oxygen pressure pld resistivity

Effect of substrate temperature on microstructural and optical properties of ZnO films grown by pulsed laser deposition

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Rare Metals 2006年第2期25卷 161-165页

作者： HE Jianting ZHUANG Huizhao XUE Chengshan WANG Shuyun HU Lijun XUE Shoubin Institute of Semiconductor Shandong Normal University Jinan 250014 China

ZnO thin films were deposited on n-Si （111） at various substrate temperatures by pulsed laser deposition （pld）. X-ray diffraction （XRD）, photoluminescence （PL）, Fourier transform infrared spectrophotometer （FTIR）, and scanning electron microscopy （SEM） were used to analyze the structure, morphology, and optical property of the ZnO thin films. An optimal crystallized ZnO thin film was obtained at the substrate temperature of 600℃. A blue shift was found in PL spectra due to size confinement effect as the grain sizes decreased. The surfaces of the ZnO thin films were more planar and compact as the substrate temperature increased.

关键词： semiconductor materials ZnO thin film pld hexagonal wurtzite structure

Preparation of Highly Textured Bi and MnBi Films by the Pulsed Laser Deposition Method

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Chinese Physics Letters 2015年第12期32卷 139-142页

作者：周栋张银峰马小柏刘顺荃韩景智朱明刚王常生杨金波 State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing 100871 Division of Functional Materials Central Iron & Steel Research Institute Beijing 100081)

Textured Bi and MnBi/Bi thin films are prepared by the pulsed laser deposition method. The highly c-axis textured MnBi films are obtained by annealing the bilayer consisting of textured Bi and Mn films. The eoercivities of the MnBi/Bi film are 1.5 T and 2.35 T at room temperature and at 373K, respectively, showing a positive temperature coefficient. Microstructural investigations show that the textured MnBi film results from the orientated growth induced by the textured Bi under-layer.

关键词： Bi Preparation of Highly Textured Bi and MnBi Films by the Pulsed Laser Deposition Method Mn Figure pld

Fabrication of IBAD-MgO and pld-CeO2 Layers for YBCO Coated Conductors

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Chinese Physics Letters 2015年第7期32卷 206-209页

作者：牟晴晴刘林飞李贻杰 Key Laboratory of Artificial Structure and Quantum Control Department of Physics and AstronomyShanghai Jiao Tong University

MgO thin films with different textures are fabricated by the ion beam assisted （IBAD） method on the Y2O3/Al2O3 buffered C276 tape. Then a CaO2 layer is directly grown on the IBAD-MgO film by the pulsed laser deposition （pld） method. Effects of lBAD-MgO texture, substrata temperature and thickness on the grain alignment of the CeO2 layer are investigated. Film characterization is performed by x-ray diffraction and atomic force microscopy. It is found that the orientation and texture degree of the CaO2 layer are very sensitive to the IBAD-MgO texture. By optimizing the IBAD-MgO texture, CeO2 has pure （002） orientation and excellent biaxial texture deposited in a broad substrata temperature range. In addition, the pld-CeO2 layer has a thickness effect. Under the optimized experimental condition, the pld-CeO2 layer has a high in-plane texture of △φ = 2.9° and a smooth surface with an rms surface roughness of less than 2nm. The critical current density Jc of a 0.4μm-thick YBCO film deposited on the CeO2 layer is 6.25 × 106 A/cm2 at 77K and a self-field.

关键词： Fabrication of IBAD-MgO and pld-CeO2 Layers for YBCO Coated Conductors pld MgO