Search results for: Piyi Du

Items from 1 to 20 out of 112 results

article

Control of Oxygen Vacancies in TiO₆ Octahedra of Amorphous BaTiO₃ Thin Films with Tunable Built‐In Electric Field in a‐BaTiO₃/p‐Si Heterojunction for Metal–Oxide–Semiconductor Applications

Jian Gu, Wei Tian, Zongrong Wang, Ning Ma, more

physica status solidi (a) > 217 > 10 > n/a - n/a

Amorphous BaTiO₃ (a‐BTO) thin films are deposited on p‐Si(111) substrates by radio frequency (RF) magnetron sputtering without extra substrate heating. The microstructure of a‐BTO thin films is modified by postannealing at low temperatures (260–600 °C) in air. The results show that distorted TiO₆ octahedra exist in a‐BTO thin films, and the degree of distortion decreases when the annealing temperature...

article

Tailoring the light absorption of Ag-PZT thin films by controlling the growth of hexagonal- and cubic-phase Ag nanoparticles

Tao Hu, Zongrong Wang, Ning Ma, Piyi Du

Applied Physics A > 2017 > 123 > 12 > 1-8

PbZr_0.52Ti_0.48O₃ thin films containing hexagonal and cubic Ag nanoparticles (Ag NPs) of various sizes were prepared using the sol–gel technique. During the aging process, Ag ions were photo-reduced to form hexagonal Ag NPs. These NPs were uniform in size, and their uniformity was maintained in the thin films during the heat treatment process. Both the total volume and average size of the hexagonal...

article

Formation of BaFe_12−xNb_xO₁₉ and its high electromagnetic wave absorption properties in millimeter wave frequency range

Chuyang Liu, Yujie Chen, Yangyu Yue, Yu Tang, more

Journal of the American Ceramic Society > 100 > 9 > 3999 - 4010

BaFe_12−xNb_xO₁₉ (BFNO, x=0‐0.6) powders with Nb⁵⁺ substituting for Fe³⁺ were prepared by sol‐gel method. The formation process and electromagnetic (EM) wave absorption properties of the BFNO are investigated in detail. With Nb⁵⁺ content increasing from x=0 to x=0.6, the formation temperature of barium ferrite phase without heat time increases from ~700°C to ~900°C, while the appearance temperature...

article

Effect of Ag doping on the formation and properties of percolative Ag/BiFeO₃ composite thin film by sol–gel method

Qiankun Xu, Shulei Cheng, Xuelin Hao, Zongrong Wang, more

Applied Physics A > 2017 > 123 > 4 > 1-12

The Ag/BiFeO₃ thin films were prepared on ITO/glass substrate by in situ sol–gel method. The morphology and formation of the perovskite phase and Ag nanoparticles (NPs) were studied by XRD, SEM, and UV–Vis spectra. The doping of Ag⁺ ions and the formation of defects were analyzed by XPS measurement. The dielectric and magnetic properties were measured by impedance analyzer and magnetic property measurement...

article

Formation of nano-Ag/BiFeO₃ composite thin film with extraordinary high dielectric and effective ferromagnetic properties

Shulei Cheng, Qiankun Xu, Xuelin Hao, Zongrong Wang, more

Journal of Materials Science: Materials in Electronics > 2017 > 28 > 7 > 5652-5662

The Ag/BiFeO₃ composite thin films were prepared by sol–gel technology on ITO/glass substrate. Most of the Ag⁺ ions were reduced to form Ag nanoparticles in the thin film. Some Ag⁺ ions were doped into the BiFeO₃ lattice to replace Bi, forming Ag doped BiFeO₃. The average size of the Ag nanoparticles is 4–8 nm. The dielectric constant of the BiFeO₃ thin film sintered at 550 °C with the molar ratio...

article

Formation of a kaolinite-serine intercalation compound via exchange of the pre-intercalated transition molecules in kaolinite with serine

Zongrong Wang, Wan Zheng, Zhenqian Zhang, Likun Chen, more

Applied Clay Science > 2017 > 135 > C > 378-385

A kaolinite-serine intercalation compound was synthesized via the guest displacement method. Serine molecules were intercalated into kaolinite to form kaolinite-serine through exchange between serine and the guest molecules ethylene glycol or water, which was inserted into the interlayer space of kaolinite beforehand. The thickness of kaolinite-serine particles decreased to 14nm from 30nm of raw kaolinite...

article

Two stage formation of silver nanoparticles in PZT thin films controlled by re-nucleation through transition phase of Ag-Pb alloy

Tao Hu, Zongrong Wang, Ning Ma, Piyi Du

Thin Solid Films > 2016 > 616 > C > 252-259

Ag nanoparticles were formed in PbZr_0.52Ti_0.48O₃ (PZT) thin films by the sol–gel technique through two stage processes. In the first stage, Ag-Pb alloy particles formed in all film heat treated for different time from 1min to 10min. The average size of the particles increased from 0.16μm to 0.43μm while the mole ratio of Pb/(Pb+Ag) in the alloy particles increased from 0.7% to 27%. After that in the...

article

Low-loss insulating-conductive ceramic composite with giant permittivity and high permeability using glass phase as separating layer

Ruoyang Ma, Bin Xiao, Ning Ma, Piyi Du

Ceramics International > 2016 > 42 > 3 > 4126-4135

The control of dielectric loss in insulating-conductive ceramic composites is of great significance for the enhancement of the comprehensive performance of next-generation devices. In this work, a low-activity precursor co-sintering method was proposed to prepare low-loss BaTiO₃(BTO)/Ni_0.5Zn_0.5Fe₂O₄(NZFO) ceramic composite by using 2PbO–B₂O₃(PBO) glass as insulating layer. XRD and SEM were used to...

article

Percolative nanoparticle-Ag/PbZr_0.52Ti_0.48O₃ composite thin film with high dielectric and ferroelectric properties

Tao Hu, Wenjia Zhao, Ning Ma, Piyi Du

Journal of Materials Science: Materials in Electronics > 2015 > 26 > 1 > 448-455

Ag_x/PbZr_0.52Ti_0.48O₃ (PZT, x defined as mole ratio of Ag/Pb) composite thin films were fabricated by the sol–gel technique. Results showed that the Ag_x/PZT thin films were composed of perovskite phase of PZT and silver nanoparticles. The silver nanoparticles with size between 4.5 and 7 nm were uniformly dispersed in the thin films. The percolation behavior occurred in the Ag/PZT thin films. The properties...

article

Relation between the microstructure and the electromagnetic properties of BaTiO₃/Ni_0.5Zn_0.5Fe₂O₄ ceramic composite

Bin Xiao, Yu Tang, Guodong Ma, Ning Ma, more

Applied Physics A > 2015 > 119 > 4 > 1291-1300

The microstructure–property relation in ferroelectric/ferromagnetic composite is investigated in detail, exemplified by typical sol–gel-derived 0.3BTO/0.7NZFO ceramic composite. The effect of microstructural factors including intergrain connectivity, grain size and interfaces on the dielectric and magnetic properties of the composite prepared by conventional ceramic method and three-step sintering...

article

Formation of intercalation compound of kaolinite–glycine via displacing guest water by glycine

Wan Zheng, Jing Zhou, Zhenqian Zhang, Likun Chen, more

Journal of Colloid And Interface Science > 2014 > 432 > Complete > 278-284

The kaolinite–glycine intercalation compound was successfully formed by displacing intercalated guest water molecules in kaolinite hydrate as a precursor. The microstructure of the compound was characterized by X-ray diffraction, Fourier Transform Infrared Spectroscopy and Scanning Electron Microscope. Results show that glycine can only be intercalated into hydrated kaolinite to form glycine–kaolinite...

article

The effect of dual complexing agents of lactic and citric acids on the formation of sol-gel derived Ag–PbTiO3 percolative thin film

Yanbo Su, Tao Hu, Liwen Tang, Wenjian Weng, more

Thin Solid Films > 2014 > 558 > C > 118-124

Controlling the formation of conductive particles to be nano-scale is important for achieving percolation effect in metal dispersed thin film composite to contribute extraordinary dielectric properties required for miniaturization of electronic devices. In this paper, lactic acid (LA) and citric acid (CA) were used as dual complexing agents to prepare a typical Ag nanoparticle dispersed PbTiO₃ (PTO)...

article

Control of tensile stress on inducing formation and tunability of (100) oriented Pb_xSr_1−xTiO₃ thin films

Tao Hu, Hao Fu, Zan Zheng, Ning Ma, more

Applied Physics A > 2014 > 117 > 3 > 1171-1177

(100) Oriented Pb_xSr_1−xTiO₃ (PSTO) thin films are prepared on indium tin oxide (ITO)/glass substrates by sol–gel technique while inserting doped PbTiO₃ (PTO)-inducing layer in between. The effect of tensile stress in PSTO on tunability and (100) orientation of the thin films was investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscope, and atomic force...

article

Magnetron sputtering derived (100) oriented Pb0.4Sr0.6(Ti0.97Mg0.03)O2.97 thin film on inducing-layer/glass substrate with outstanding tunability

Junfei Fang, Tao Hu, Jingfeng Chen, Gaorong Han, more

Applied Surface Science > 2013 > 287 > Complete > 473-477

Pb _0.4 Sr _0.6 (Ti _0.97 Mg _0.03 )O _2.97 (PST) thin films were deposited on ITO/glass substrates with (100)/(001) oriented Tb-doped-PbTiO ₃ (Tb-PT) layer inserted by magnetron sputtering method at room temperature. And the PST thin film is well-crystallized in (100) direction at annealing temperature of 600°C for 30min. The oriented Tb-PT layer promotes...

article

Effect of dispersion degree of orientation on dielectric properties of (100)-oriented PST thin film

Xiaoting Li, Tao Hu, Biao Wang, Wenjian Weng, more

Journal of Physics and Chemistry of Solids > 2013 > 74 > 12 > 1726-1732

(100) Oriented (Pb _x Sr _1−x )TiO ₃ (PST) thin films were prepared on indium tin oxide coated glass substrates by sol–gel technique with rapid thermal processing. The dielectric permittivity and tunability of the thin films with different dispersion degrees of orientation were investigated in detail by characterizing the full width at half maximum of their (100) peak based on...

article

Strain-assisted control of high stable dielectric tunability in (100) oriented (Pb,Sr)TiO3 thin films

Zan Zheng, Tao Hu, Yiying Yao, Wenjian Weng, more

Journal of Alloys and Compounds > 2013 > 576 > Complete > 121-125

The (100) oriented (Pb,Sr)TiO ₃ (PST) thin films were prepared using terbium-doped lead titanate as inducing layer. Misfit strain of the PST thin films changed gradually along direction of thickness and with different compositions. Controlled by the strain, the Curie temperature was independent of the composition of the PST and the width of the Curie peak was broadened. The as-prepared PST...

article

Incorporation of chitosan nanospheres into thin mineralized collagen coatings for improving the antibacterial effect

Ziqiang Kong, Mengfei Yu, Kui Cheng, Wenjian Weng, more

Colloids and Surfaces B: Biointerfaces > 2013 > 111 > Complete > 536-541

It is desired that the coatings on metallic implants have both excellent biological responses and good loading-release capacities of biological factors or drugs. So far, the challenge still remains, because the morphology and composition of the bioactive coatings are usually not favorable for accommodating drug molecules. In this study, we adopted an approach of incorporating chitosan nanospheres...

article

Two step synthesis of CaP/TiO2 nanorod composite coatings with improved protein adsorption

Kui Cheng, Tiantian Wang, Wenjian Weng, Mengfei Yu, more

Thin Solid Films > 2013 > 544 > Complete > 206-211

Titanium dioxide (TiO₂) nanorods and calcium phosphate (CaP) composite coatings were prepared and characterized. TiO₂ nanorod films were grown on titanium substrates via a hydrothermal method. Then, calcium phosphate was deposited into TiO₂ nanorod films electrochemically in an aqueous electrolyte containing calcium and phosphorus species. As a result, CaP/TiO₂ nanorod coatings were obtained. The...

article

Influence of rod-surface structure on biological interactions between TiO2 nanorod films and proteins/cells

Yang Liu, Kui Cheng, Wenjian Weng, Mengfei Yu, more

Thin Solid Films > 2013 > 544 > Complete > 285-290

We investigated the use of TiO₂ nanorod films to construct an instructive microenvironment for regulation of biological activity. Rutile TiO₂ nanorod films were fabricated via a hydrothermal method. Heat treatment was used to adjust the atomic arrangement order degree of the nanorod surfaces. The influence of changes in the nanorod surface on the films was characterized. The results show that heated...

article

Synthesis, characterization and electrochemical behavior of Sb-doped ZnO microsphere film

Qian Li, Kui Cheng, Wenjian Weng, Piyi Du, more

Thin Solid Films > 2013 > 544 > Complete > 466-471

Sb-doped ZnO microsphere film was fabricated by a carboxylate ion assisted hydrothermal route coupled with a post-calcination process. The structure, chemical composition and optical band gap of the Sb-doped ZnO microsphere film were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, inductively couple plasma optical emission spectroscopy and UV–visible spectrophotometry, and compared...

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DIELECTRIC PROPERTIES (6)
FILM (4)
FILMS (4)
HYDROTHERMAL (4)
LOW TEMPERATURE (4)
SOL-GEL (4)
CERAMICS (3)
CHEMICAL VAPOR DEPOSITION (3)
COMPOSITE MATERIALS (3)
FLUORIDATED HYDROXYAPATITE (3)
INTERCALATION (3)
LEAD TITANATE (3)
LUMINESCENCE (3)
MICROSTRUCTURE (3)
NANOSTRUCTURED MATERIALS (3)
PHASE FORMATION (3)
SINTERING (3)
SOFC (3)
SOL–GEL PROCESSES (3)
APATITE (2)
BST (2)
CARBON DEPOSITION (2)
CITRIC ACID (2)
COMPOSITES (2)
DIELECTRIC TUNABILITY (2)
DISSOLUTION (2)
FERROELECTRICS (2)
GUEST DISPLACEMENT (2)
HYDRATED KAOLINITE (2)
HYDROGEN PEROXIDE BIOSENSOR (2)
HYDROPHILICITY (2)
HYDROTHERMAL METHOD (2)
INDUCING LAYER (2)
MECHANISM (2)
MINERALIZED COLLAGEN (2)
NANODOTS (2)
NANOPARTICLES (2)
PERCOLATION (2)
PEROVSKITES (2)
PST THIN FILM (2)
RESISTIVITY (2)
SILICON (2)
SILVER (2)
SILVER NANOPARTICLES (2)
SOL–GEL (2)
SOL–GEL DEPOSITION (2)
SPIN COATING (2)
THIN COATING (2)
THIN FILMS (2)
TIO2 (2)
TITANIUM (2)
TITANIUM IMPLANT (2)
ZN RELEASE (2)
(100) ORIENTATION (1)
(BA,SR)TIO3 (1)
(PB,LA)TIO3 (1)
(PB,SR)TIO3 THIN FILM (1)
A NODE-SUPPORTED SOLID OXIDE FUEL CELLS (1)
A. (100) ORIENTED PST THIN FILMS (1)
A. MULTIFERROIC COMPOSITES (1)
A. THIN FILMS (1)
A1. CHARACTERIZATION (1)
A1. CRYSTAL MORPHOLOGY (1)
A1. CRYSTAL STRUCTURE (1)
A1. NANOSTRUCTURES (1)
A2. HYDROTHERMAL CRYSTAL GROWTH (1)
ABSORPTION/ABSORBENTS (1)
ADSORPTION (1)
ALKOXIDE (1)
ALUMINUM (1)
AMORPHOUS BATIO3 THIN FILMS (1)
AMORPHOUS SEMICONDUCTORS (1)
AMORPHOUS SILICON (1)
ANISOTROPY (1)
ANNEALING (1)
APCVD METHOD (1)
ASSISTED GROWTH (1)
ATMOSPHERE PRESSURE CHEMICAL VAPOR DEPOSITION (1)
B. CRYSTAL GROWTH (1)
B. GRAIN BOUNDARY (1)
B. HYBRID PROCESSING (1)
B. SOL–GEL PROCESS (1)
B. VAPOR DEPOSITION (1)
B1. STRONTIUM TITANATE (1)
BARIUM TITANATE (1)
BATIO3 DENDRITES (1)
BATIO3–NI COMPOSITE (1)
BI2FE4O9 NANOPARTICLES (1)
BICOXFE1−XO3 (1)
BIOACTIVE COATING (1)
BIOACTIVITY (1)
BIPHASE (1)
BIPHASIC (1)
BISMUTH FERRITE NANOFLAKES (1)
BONDING STRENGTH (1)
BOVINE SERUM ALBUMIN (1)
C. ELECTRICAL CONDUCTIVITY (1)
CALCINATION (1)
CALCIUM PHOSPHATE (1)
CALCIUM PHOSPHATE COATINGS (1)
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Journal of Alloys and Compounds (9)
Surface & Coatings Technology (7)
Ceramics International (6)
Journal of Materials Science: Materials in Medicine (6)
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Journal of Materials Science: Materials in Electronics (4)
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Journal of the American Ceramic Society (3)
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Journal of Power Sources (2)
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Angewandte Chemie (1)
Angewandte Chemie International Edition (1)
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Clays and Clay Minerals (1)
Colloids and Surfaces B: Biointerfaces (1)
Crystal Growth & Design (1)
Frontiers of Materials Science (1)
Journal of Biomedical Materials Research Part B: Applied Biomaterials (1)
Journal of Colloid And Interface Science (1)
Journal of Controlled Release (1)
Journal of Crystal Growth (1)
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INFONA - science communication portal

Search results for: Piyi Du

Control of Oxygen Vacancies in TiO₆ Octahedra of Amorphous BaTiO₃ Thin Films with Tunable Built‐In Electric Field in a‐BaTiO₃/p‐Si Heterojunction for Metal–Oxide–Semiconductor Applications

Tailoring the light absorption of Ag-PZT thin films by controlling the growth of hexagonal- and cubic-phase Ag nanoparticles

Formation of BaFe_12−xNb_xO₁₉ and its high electromagnetic wave absorption properties in millimeter wave frequency range

Effect of Ag doping on the formation and properties of percolative Ag/BiFeO₃ composite thin film by sol–gel method

Formation of nano-Ag/BiFeO₃ composite thin film with extraordinary high dielectric and effective ferromagnetic properties

Formation of a kaolinite-serine intercalation compound via exchange of the pre-intercalated transition molecules in kaolinite with serine

Two stage formation of silver nanoparticles in PZT thin films controlled by re-nucleation through transition phase of Ag-Pb alloy

Low-loss insulating-conductive ceramic composite with giant permittivity and high permeability using glass phase as separating layer

Percolative nanoparticle-Ag/PbZr_0.52Ti_0.48O₃ composite thin film with high dielectric and ferroelectric properties

Relation between the microstructure and the electromagnetic properties of BaTiO₃/Ni_0.5Zn_0.5Fe₂O₄ ceramic composite

Formation of intercalation compound of kaolinite–glycine via displacing guest water by glycine

The effect of dual complexing agents of lactic and citric acids on the formation of sol-gel derived Ag–PbTiO3 percolative thin film

Control of tensile stress on inducing formation and tunability of (100) oriented Pb_xSr_1−xTiO₃ thin films

Magnetron sputtering derived (100) oriented Pb0.4Sr0.6(Ti0.97Mg0.03)O2.97 thin film on inducing-layer/glass substrate with outstanding tunability

Effect of dispersion degree of orientation on dielectric properties of (100)-oriented PST thin film

Strain-assisted control of high stable dielectric tunability in (100) oriented (Pb,Sr)TiO3 thin films

Incorporation of chitosan nanospheres into thin mineralized collagen coatings for improving the antibacterial effect

Two step synthesis of CaP/TiO2 nanorod composite coatings with improved protein adsorption

Influence of rod-surface structure on biological interactions between TiO2 nanorod films and proteins/cells

Synthesis, characterization and electrochemical behavior of Sb-doped ZnO microsphere film

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