Characteristics of Zn1-xAlxO NR/ITO Composite Films Oriented Application for Optoelectronic Devices

The Zn1-xAlxO nanorod (NR) were grown on ITO substrates by a hydrothermal process. The influences of the Al doping concentration on the surface morphology, structural, optical, and electrical characteristics of the Zn1-xAlxO NR/ITO composite film were investigated in detail. The results indicated that characteristics of the Zn1-xAlxO NR/ITO composite film were strongly influenced by the Al doping concentration. Furthermore, the lowest vertical resistance of the Zn1-xAlxO NR can be obtained when x = 0.01 and it strongly reduces when the concentration of UV light illumination increases. This reduction follows an exponential decay with a decay rate of 4.35. This result shows good photoconductivity response of the Zn1-xAlxO NR/ITO composite film and its ability to apply for optoelectronic devices material.

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Improvement of TiO2/LDPE Composite Films for Photocatalytic Oxidation of Acetone

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.931-932.235 ◽

2014 ◽

Vol 931-932 ◽

pp. 235-240 ◽

Cited By ~ 2

Author(s):

Kowit Suwannahong ◽

Sanya Sirivithayapakorn ◽

Pongsak Noophan ◽

Wipada Sanongraj

Keyword(s):

Composite Film ◽

Photocatalytic Oxidation ◽

Fourier Transforms ◽

Uv Light ◽

Composite Films ◽

X Ray Diffraction ◽

Experimental Conditions ◽

Closed Chamber ◽

Acetone Concentration ◽

Ftir Spectrometer

Titanium dioxide with coupling agent (ETES) was applied as a photocatalyst for a synthesis of the TiO2/LDPE composite film. The physical properties of TiO2/LDPE composite film were analyzed by a Scanning Electron Microscope (SEM). TiO2 particles were impregnated into the polymer matrix film as a LDPE composite film. The results from the X-ray Diffraction (XRD) technique revealed that the structure of TiO2/LDPE composite film were anatase crystalline. The chemical structure of the TiO2/ LDPE composite films were analyzed by an ATR-Fourier transforms infrared (ATR-FTIR) spectrometer. Wavenumber of FTIR spectra at 719 cm1 indicated the Ti-O-Ti bond. Band gap energies of the films ranged from 3.19-3.29 eV. The photocatalytic activity of the film was tested for removal of gaseous acetone in a closed chamber. Experimental conditions were set as follows: a UV light intensity of approximately 2.7 mW.cm-2, flow rate of 2 L.min-1, and an initial acetone concentration of about 435±20 ppm. While the catalyst dosage was varied from 3% to 15% (wt. cat/wt. film).The degradation rate of acetone increased when increasing dosage of TiO2 from 3% to 10%, then decreased a little bit when increasing the dosage to 15%. The TiO2/LDPE composite film at the dosage of 10% yielded the highest removal efficiency of 75%, followed by the film at the dosage of 15%, 5%, and 3%, respectively.

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TiO2-KH550 Nanoparticle-Reinforced PVA/xylan Composite Films with Multifunctional Properties

Materials ◽

10.3390/ma11091589 ◽

2018 ◽

Vol 11 (9) ◽

pp. 1589 ◽

Cited By ~ 8

Author(s):

Xinxin Liu ◽

Xiaofeng Chen ◽

Junli Ren ◽

Chunhui Zhang

Keyword(s):

Tensile Strength ◽

Water Vapor ◽

Composite Film ◽

Oxygen Permeability ◽

Positive Impact ◽

Uv Light ◽

Composite Films ◽

Weight Ratio ◽

Water Vapor Permeability ◽

Vapor Permeability

In order to improve the strength of polyvinyl alcohol (PVA)/xylan composite films and endow them with ultraviolet (UV) shielding ability, TiO2-KH550 nanoparticles was synthesized and added into the PVA/xylan matrix. The TiO2-KH550 nanoparticle dispersed well in the 0.04% sodium hexametaphosphate (SHMP) solution under ultrasonic and stirring treatments. Investigations on the properties of the films showed that TiO2-KH550 had the positive impact on improving the strength, moisture, and oxygen barrier properties of the composite films. The maximum tensile strength (27.3 MPa), the minimum water vapor permeability (2.75 × 10−11 g·m−1·s−1·Pa−1), and oxygen permeability (4.013 cm3·m−2·24 h−1·0.1MPa−1) were obtained under the addition of 1.5% TiO2-KH550. The tensile strength of TiO2-KH550 reinforced composite film was increased by 70% than that of the pure PVA/xylan composite film, and the water vapor and oxygen permeability were decreased by 31% and 41%, respectively. Moreover, the UV transmittance of the film at the wavelength of 400 nm was almost zero when adding ≈1.5~2.5% (weight ratio, based on the total weight of PVA and xylan) of TiO2-KH550, which indicated the PVA/xylan composite films were endowed with an excellent UV light shielding ability.

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Vanadium oxide-based photochromic composite film

RSC Advances ◽

10.1039/c6ra25892a ◽

2017 ◽

Vol 7 (5) ◽

pp. 2388-2391 ◽

Cited By ~ 11

Author(s):

Hidetoshi Miyazaki ◽

Takahiro Matsuura ◽

Toshitaka Ota

Keyword(s):

Vanadium Oxide ◽

Composite Film ◽

Uv Light ◽

Composite Films ◽

Photochromic Property ◽

The Matrix ◽

Vanadic Acid

V2O5-based composite films were fabricated using peroxo-iso-poly vanadic acid as the filler and transparent urethane resin as the matrix, and the resulting composite films exhibited photochromic property when irradiated with ultraviolet (UV) light.

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A sensitive ultraviolet light photodiode based on graphene-on-zinc oxide Schottky junction

Nanophotonics ◽

10.1515/nanoph-2016-0143 ◽

2016 ◽

Vol 6 (5) ◽

pp. 1073-1081 ◽

Cited By ~ 22

Author(s):

Teng-Fei Zhang ◽

Guo-An Wu ◽

Jiu-Zhen Wang ◽

Yong-Qiang Yu ◽

Deng-Yue Zhang ◽

...

Keyword(s):

Zinc Oxide ◽

Potential Application ◽

Schottky Barrier Height ◽

Uv Light ◽

Graphene Film ◽

Optoelectronic Devices ◽

Schottky Junction ◽

Light Illumination ◽

Good Reproducibility ◽

Zno Nanostructure

AbstractIn this study, we present a simple ultraviolet (UV) light photodiode by transferring a layer of graphene film on single-crystal ZnO substrate. The as-fabricated heterojunction exhibited typical rectifying behavior, with a Schottky barrier height of 0.623 eV. Further optoelectronic characterization revealed that the graphene-ZnO Schottky junction photodiode displayed obvious sensitivity to 365-nm light illumination with good reproducibility. The responsivity and photoconductive gain were estimated to be 3×104 A/W and 105, respectively, which were much higher than other ZnO nanostructure-based devices. In addition, it was found that the on/off ratio of the present device can be considerably improved from 2.09 to 12.1, when the device was passivated by a layer of AlOx film. These results suggest that the present simply structured graphene-ZnO UV photodiode may find potential application in future optoelectronic devices.

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TiO2-KH550 Nanoparticle Reinforced PVA/Xylan Composite Films with Multifunctional Properties

10.20944/preprints201808.0016.v1 ◽

2018 ◽

Author(s):

Xinxin Liu ◽

Xiaofeng Chen ◽

Junli Ren ◽

Chunhui Zhang

Keyword(s):

Tensile Strength ◽

Water Vapor ◽

Composite Film ◽

Oxygen Permeability ◽

Positive Impact ◽

Uv Light ◽

Composite Films ◽

Water Vapor Permeability ◽

Barrier Properties ◽

Vapor Permeability

In order to improve the strength of PVA/xylan composite films and endow them with ultraviolet (UV) shielding ability, TiO2-KH550 nanoparticle was synthesized and added into the PVA/xylan matrix. The TiO2-KH550 nanoparticle dispersed well in the 0.04% sodium hexametaphosphate (SHMP) solution under ultrasonic and stirring treatments. Investigations on the properties of films showed that TiO2-KH550 had the positive impact on improving the strength, moisture and oxygen barrier properties of the composite films. The maximum tensile strength (27.3 MPa), the minimum water vapor permeability (2.75×10-11 g•m-1•s-1•Pa-1) and oxygen permeability (4.013 cm3•m-2•24h-1•0.1MPa-1) were obtained under the addition of 1.5% TiO2-KH550. The tensile strength of TiO2-KH550 reinforced composite film was increased by 70% than that of the pure PVA/xylan composite film, and the water vapor and oxygen permeability were decreased by 31% and 41%, respectively. Moreover, the UV transmittance of film at the wavelength of 400 nm was almost zero when adding 1.5~2.5% of TiO2-KH550, which indicated the PVA/xylan composite films were endowed with excellent UV light shielding ability.

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Enhanced Dielectric and Hydrophobic Properties of Poly(vinylidene fluoride-trifluoroethylene)/TiO2 Nanowire Arrays Composite Film Surface Modified by Electrospinning

Polymers ◽

10.3390/polym13010105 ◽

2020 ◽

Vol 13 (1) ◽

pp. 105

Author(s):

Da Shen ◽

Qilong Zhang ◽

Zhao Zhang ◽

Hui Yang ◽

Jiansong Sheng

Keyword(s):

Composite Film ◽

Vinylidene Fluoride ◽

Hydrothermal Process ◽

Composite Films ◽

Film Surface ◽

Nanowire Arrays ◽

Tio2 Nanowires ◽

Tio2 Nanowire ◽

Poly Vinylidene Fluoride ◽

Surface Modified

In this research, we designed a feasible method to prepare composite films with high permittivity and significantly enhanced hydrophobic performance, which showed huge potential in the electrowetting field. TiO2 nanowire arrays were prepared by a one-step hydrothermal process, and poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) was spin-coated on the nanowire arrays to form composite, the surface of which was modified by electrospinning. Due to the great orientation of TiO2 nanowires, dipoles and space charges are in ordered arrangement along the electric field, and this strongly reinforced the Maxwell–Wagner–Sillars (MWS) polarization, thus the permittivity of the composite (TiO2 nanowire length/film thickness is 0.769) reaches 53 at 1 kHz, which is nearly 3 times higher than pure P(VDF-TrFE). Meanwhile the composite film possesses low dielectric loss (0.07) and low conductivity (2.69 × 10−9 S/cm), showing good insulation. The contact angle of the composite after electrospinning (about 137°) was greatly enhanced from pure P(VDF-TrFE) spin-coated film (about 89°), which can be attributed to the microrough structure built by P(VDF-TrFE) nanofibers.

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Probing the Dynamic Self-Assembly Behaviour of Photoswitchable Wormlike Micelles in Real Time

10.26434/chemrxiv.7098695 ◽

2018 ◽

Author(s):

Elaine A. Kelly ◽

Judith E. Houston ◽

Rachel Evans

Keyword(s):

Real Time ◽

Absorption Spectroscopy ◽

Self Assembly ◽

Uv Light ◽

Wormlike Micelles ◽

Tetraethylene Glycol ◽

Light Illumination ◽

First Time ◽

Dependent Processes

Understanding the dynamic self-assembly behaviour of azobenzene photosurfactants (AzoPS) is crucial to advance their use in controlled release applications such asdrug delivery and micellar catalysis. Currently, their behaviour in the equilibrium cis-and trans-photostationary states is more widely understood than during the photoisomerisation process itself. Here, we investigate the time-dependent self-assembly of the different photoisomers of a model neutral AzoPS, <a>tetraethylene glycol mono(4′,4-octyloxy,octyl-azobenzene) </a>(C8AzoOC8E4) using small-angle neutron scattering (SANS). We show that the incorporation of in-situUV-Vis absorption spectroscopy with SANS allows the scattering profile, and hence micelle shape, to be correlated with the extent of photoisomerisation in real-time. It was observed that C8AzoOC8E4could switch between wormlike micelles (transnative state) and fractal aggregates (under UV light), with changes in the self-assembled structure arising concurrently with changes in the absorption spectrum. Wormlike micelles could be recovered within 60 seconds of blue light illumination. To the best of our knowledge, this is the first time the degree of AzoPS photoisomerisation has been tracked in-situthrough combined UV-Vis absorption spectroscopy-SANS measurements. This technique could be widely used to gain mechanistic and kinetic insights into light-dependent processes that are reliant on self-assembly.

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Deposition and Tribological Properties of CVD Diamond/Diamond-Like Carbon Composite Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.565.615 ◽

2012 ◽

Vol 565 ◽

pp. 615-620

Author(s):

Bin Shen ◽

Liang Wang ◽

Su Lin Chen ◽

Fang Hong Sun

Keyword(s):

Surface Morphology ◽

Composite Film ◽

Tribological Properties ◽

Composite Films ◽

Cvd Diamond ◽

Carbon Composite ◽

Dry Sliding ◽

Diamond Like Carbon ◽

Dlc Film ◽

Bonding State

The CVD diamond/diamond-like carbon composite film is fabricated on the WC-Co substrate by depositing a layer of Diamond-like Carbon film on the surface of conventional Micro- or Nano-crystalline diamond film. The hot filament chemical vapor deposition (HFCVD) method and vacuum arc discharge with a graphite cathode are adopted respectively to deposit the MCD/NCD and DLC films. A variety of characterization techniques, including filed emission scanning electron microscope (FE-SEM) and Raman spectroscopy are employed to investigate the surface morphology and atomic bonding state of as-deposited MCD/DLC and NCD/DLC composite film. The results show that both MCD/DLC and NCD/DLC composite films present similar surface morphology with the MCD and NCD films, except for scattering a considerable amount of small-sized diamond crystallites among the grain boundary area. The atomic-bonding state of as-deposited MCD/DLC and NCD/DLC composite films is determined by the top-layered DLC film, which is mainly consisted of amorphous carbon phase and no discernible sp3 characteristic peak can be observed from their Raman spectrum. Furthermore, the tribological properties of as-deposited MCD/DLC and NCD/DLC composite films is examined using a ball-on-plate reciprocating friction tester under both dry sliding and water-lubricating conditions, comparing with conventional DLC, MCD and NCD films. Silicon nitride balls are used as counterpart materials. For the CVD diamond/DLC composite films, the self-lubricating effect of top-layered DLC film is beneficial for suppressing the initial friction peak, as well as shortening the run-in period. The average friction coefficients of MCD/DLC and NCD/DLC composite films during stable sliding period are 0.07 and 0.10 respectively in dry sliding; while under water-lubricating condition, they further decreases to 0.03 and 0.07.

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Boosting Performance of Self-Polarized Fully Printed Piezoelectric Nanogenerators via Modulated Strength of Hydrogen Bonding Interactions

Nanomaterials ◽

10.3390/nano11081908 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1908

Author(s):

Hai Li ◽

Sooman Lim

Keyword(s):

Hydrogen Bonding ◽

Composite Film ◽

High Performance ◽

Composite Films ◽

Β Phase ◽

Hydrogen Bonding Interactions ◽

Barium Titanate Nanoparticles ◽

Surface Modified ◽

Piezoelectric Devices ◽

Piezoelectric Nanogenerators

Self-polarized piezoelectric devices have attracted significant interest owing to their fabrication processes with low energy consumption. Herein, novel poling-free piezoelectric nanogenerators (PENGs) based on self-polarized polyvinylidene difluoride (PVDF) induced by the incorporation of different surface-modified barium titanate nanoparticles (BTO NPs) were prepared via a fully printing process. To reveal the effect of intermolecular interactions between PVDF and NP surface groups, BTO NPs were modified with hydrophilic polydopamine (PDA) and hydrophobic 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) to yield PDA-BTO and PFD-BTO, respectively. This study demonstrates that the stronger hydrogen bonding interactions existed in PFD-BTO/PVDF composite film comparative to the PDA-BTO/PVDF composite film induced the higher β-phase formation (90%), which was evidenced by the XRD, FTIR and DSC results, as well as led to a better dispersion of NPs and improved mechanical properties of composite films. Consequently, PFD-BTO/PVDF-based PENGs without electric poling exhibited a significantly improved output voltage of 5.9 V and power density of 102 μW cm−3, which was 1.8 and 2.9 times higher than that of PDA-BTO/PVDF-based PENGs, respectively. This study provides a promising approach for advancing the search for high-performance, self-polarized PENGs in next-generation electric and electronic industries.

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Significantly Improved Dielectric Performance of Poly(1-butene)-Based Composite Films via Filling Polydopamine Modified Ba(Zr0.2Ti0.8)O3-Coated Multiwalled Carbon Nanotubes Nanoparticles

Polymers ◽

10.3390/polym13020285 ◽

2021 ◽

Vol 13 (2) ◽

pp. 285

Author(s):

Lingfei Li ◽

Qiu Sun ◽

Xiangqun Chen ◽

Zhaohua Jiang ◽

Yongjun Xu

Keyword(s):

Carbon Nanotubes ◽

Dielectric Constant ◽

Energy Storage ◽

Composite Film ◽

Multiwalled Carbon Nanotubes ◽

Sol Gel ◽

Composite Films ◽

Weak Electric Field ◽

Multiwalled Carbon ◽

Dielectric Performance

The low dielectric constant of the nonpolar polymer poly(1-butene) (PB-1) limits its application as a diaphragm element in energy storage capacitors. In this work, Ba(Zr0.2Ti0.8)O3-coated multiwalled carbon nanotubes (BZT@MWCNTs) were first prepared by using the sol–gel hydrothermal method and then modified with polydopamine (PDA) via noncovalent polymerization. Finally, PB-1 matrix composite films filled with PDA-modified BZT@MWCNTs nanoparticles were fabricated through a solution-casting method. Results indicated that the PDA-modified BZT@MWCNTs had good dispersion and binding force in the PB-1 matrix. These characteristics improved the dielectric and energy storage performances of the films. Specifically, the PDA-modified 10 vol% BZT@ 0.5 vol% MWCNTs/PB-1 composite film exhibited the best dielectric performance. At 1 kHz, the dielectric constant of this film was 25.43, which was 12.7 times that of pure PB-1 films. Moreover, its dielectric loss was 0.0077. Furthermore, under the weak electric field of 210 MV·m−1, the highest energy density of the PDA-modified 10 vol% BZT@ 0.5 vol% MWCNTs/PB-1 composite film was 4.57 J·cm−3, which was over 3.5 times that of PB-1 film (≈1.3 J·cm−3 at 388 MV·m−1).

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