scholarly journals Transparent functional nanocomposite films based on octahedral metal clusters: synthesis by electrophoretic deposition process and characterization

2019 ◽  
Vol 6 (3) ◽  
pp. 181647 ◽  
Author(s):  
Ngan Thi Kim Nguyen ◽  
Marion Dubernet ◽  
Yoshio Matsui ◽  
Maxence Wilmet ◽  
Naoto Shirahata ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Physical Stability ◽  
Polymer Nanocomposite ◽  
Deposition Process ◽  
Nanocomposite Films ◽  
Visible Range ◽  
Homogeneous Distribution ◽  
Ito Glass

Transparent optical thin films have recently attracted a growing interest for functional window applications. In this study, highly visible transparent nanocomposite films with ultraviolet (UV)-near-infrared (NIR)-blocking capabilities are reported. Such films, composed of Mo 6 and Nb 6 octahedral metal atom clusters (MC) and polymethylmethacrylate polymer (PMMA), were prepared by electrophoretic deposition on indium tin oxide-coated glass (ITO glass). PMMA was found to improve both the chemical and physical stability of Mo 6 and Nb 6 MCs, resulting in a relatively homogeneous distribution of the clusters within the PMMA matrix, as seen by microstructural observations. The optical absorption spectrum of these transparent MC@polymer nanocomposite films was marked by contributions from their Mo 6 and Nb 6 -based clusters (absorption in the UV range) and from the ITO layer on silica glass (absorption in the NIR range). Mo 6 @PMMA nanocomposite films also exhibited excellent photoluminescence properties, which were preserved even after exposure to 50°C at a relative humidity of 70% for one month. These films cumulate high transparency in the visible range with remarkable UV-NIR blocking properties and represent interesting candidates for functional glass application.

Near Infrared Photothermoelectric Effect in Transparent AZO/ITO/Ag/ITO Thin Films

2021 ◽  
Author(s):  
Catarina Bianchi ◽  
Ana Marques ◽  
Rui Silva ◽  
Tomas Calmeiro ◽  
Isabel Ferreira
Keyword(s):  
Indium Tin Oxide ◽  
Near Infrared ◽  
Thermal Control ◽  
High Energy ◽  
Visible Range ◽  
Azo Thin Film ◽  
Ito Thin Films ◽  
Aluminum Doped Zinc Oxide ◽  
Temperature Constant ◽  
20 Nm

Abstract A new concept of oxide-metal-oxide structures that combine photothermoelectric effect with high reflectance (~80%) at wavelengths in the infrared (> 1100 nm) and high transmittance in the visible range is reported here. This was observed in optimized ITO/Ag/ITO structure, 20 nm of Siver (Ag) and 40 nm of Indium Tin Oxide (ITO), deposited on Aluminum doped Zinc Oxide (AZO) thin film. These layers show high energy saving efficiency by keeping the temperature constant inside a glazed compartment under solar radiation, but additionally they also show a photothermoelectric effect. Under uniform heating of the sample a thermoelectric effect is observed (S = 40 μV/K), but when irradiated, a potential proportional to the intensity of the radiation is also observed. Therefore, in addition to thermal control in windows, these low emission coatings can be applied as transparent photothermoelectric devices.

Fabrication of Barium Titanate Inverse Opals by Sol-Gel Electrophoretic Deposition Process

2010 ◽  
Vol 434-435 ◽  
pp. 247-252 ◽  
Author(s):  
Bo Li ◽  
Jin Qing Wang ◽  
Rei Fujiwara ◽  
Makoto Kuwabara ◽  
Ming Fu ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Photonic Crystals ◽  
Electrophoretic Deposition ◽  
Sol Gel ◽  
Deposition Process ◽  
Visible Range ◽  
Face Centered Cubic ◽  
Sem Images ◽  
Inverse Opals ◽  
Opal Template

Barium titanate (BTO) inverse opal photonic crystals were fabricated by a process of self-assembly of polystyrene opal template in combination with electrophoretic deposition (EPD) of nanoparticles from BTO suspension. In this process, stable monodispersed suspension of BTO nanoparticles was prepared by dispersing BTO gel into a mixed solvent of 2-methoxyethanol and acethylacetone. Then the BTO nanoparticles were infilled into the interstices of the opal template formed by monodisperse polystyrene microspheres by electrophoretic deposition, and then polystyrene template was removed by calcining the specimen at a final temperature of 500oC. SEM images show that the inverse opals possess face-centered cubic (fcc) structure with center to center distant of the air spheres 310 nm. A photonic bandgap in the visible range is observed from reflection spectra of the sample. Such BTO inverse opals as photonic crystals should be useful in device applications.

scholarly journals Ga-Doped ZnO Coating—A Suitable Tool for Tuning the Electrode Properties in the Solar Cells with CdS/ZnS Core-Shell Quantum Dots

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 137
Author(s):  
Mariya Aleksandrova ◽  
Tatyana Ivanova ◽  
Velichka Strijkova ◽  
Tsvetozar Tsanev ◽  
Ajaya Kumar Singh ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Quantum Dots ◽  
Solar Cells ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Optical Transmittance ◽  
Visible Range ◽  
Infrared Range ◽  
Layer System ◽  
Doped Zno

Two layer system from sputtered indium tin oxide (ITO) and gallium doped zinc oxide (Ga:ZnO, GZO) were studied for transparency in the visible electromagnetic range, reflectivity in the near infrared range, conductivity and valent band for a solar cells with quantum dots. The bi-layer coatings produced at optimized oxygen partial pressure, films thickness and surface roughness exhibit improved optical properties without worsening the electrical parameters, even if additional oxygen introduction during the reactive sputtering of the GZO. With an average optical transmittance of 91.3% in the visible range, average reflection and resistivity lower than 0.4 × 10−2 Ω.cm, these coatings are suitable for top electrode in the solar cells. The obtained results reveal that multilayered stacks of transparent ITO/Ga-doped ZnO coatings possess relatively low surface roughness (7–9 nm) and appropriate refractive index. The additional oxidation of GZO films induces modification of the film thickness and respectively of their optical performances.

scholarly journals Effect of Target Sintering Temperature on the Morphological and Optical Properties of Pulsed Laser Deposited TiO2 Thin Films

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 561
Author(s):  
Laid Kadri ◽  
Georgiana Bulai ◽  
Aurelian Carlescu ◽  
Stoian George ◽  
Silviu Gurlui ◽  
...  
Keyword(s):  
Thin Films ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Indium Tin Oxide ◽  
Sintering Temperature ◽  
Pulsed Laser ◽  
Visible Range ◽  
Tio2 Thin Films ◽  
Vis Spectroscopy ◽  
Ito Glass

In this paper, we report on the effect of titanium dioxide (TiO2) target sintering temperature on the morphological and optical properties of amorphous titanium dioxide thin films synthesized by pulsed laser deposition (PLD) on indium tin oxide (ITO) glass substrate and subsequently heat-treated in air at low temperature (150 °C). Three types of targets were used, unsintered (pressed at room temperature), sintered at 500 °C and sintered at 1000 °C. The surface morphology of the samples was investigated by scanning electron microscopy (SEM), and profilometry was used for thickness measurements. The structural properties of the films were examined by X-ray diffraction (XRD), while their optical properties were studied by UV‒vis spectroscopy. The obtained TiO2 thin films have an amorphous nature, as shown by XRD analysis. Profilometer showed that sintered target samples have more reliable thicknesses than unsintered ones. The SEM studies revealed the sufficient structural homogeneity of sintered target nanosized TiO2 films and agglomerates in the case of unsintered target film. The UV‒vis transmittance spectra showed high transparency in the visible range of PLD films, proportional to the target sintering temperature. The optical band gaps of the films deposited using the 500 °C and 1000 °C sintered targets are closer to those of anatase and rutile phases, respectively, which provides a promising approach to the challenges of amorphous TiO2-based nanostructures.

scholarly journals Triple Layer Tungsten Trioxide, Graphene, and Polyaniline Composite Films for Combined Energy Storage and Electrochromic Applications

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 49 ◽  
Author(s):  
Hailong Lyu
Keyword(s):  
Energy Storage ◽  
Indium Tin Oxide ◽  
Chemical Interaction ◽  
Nanocomposite Films ◽  
Pani Film ◽  
Cyclic Voltammogram ◽  
Sem Images ◽  
Positive Effects ◽  
Ito Glass ◽  
Pani Matrix

Different polyaniline (PANI)-based hybrid films were successfully prepared by electro-polymerizing aniline monomers onto pre-spin-coated indium tin oxide (ITO) glass slides with WO3, graphene, or WO3/graphene films. Comparing with pristine PANI, the shifts of the characteristic peaks of PANI-based nanocomposites in UV-visible absorption spectra (UV-vis) and Fourier transform infrared spectroscopy (FT-IR) indicate the chemical interaction between the PANI matrix and the nanofillers, which is also confirmed by the scanning electron microscope (SEM) images. Corresponding coloration efficiencies were obtained for the WO3/PANI (40.42 cm2 C−1), graphene/PANI (78.64 cm2 C−1), and WO3/graphene/PANI (67.47 cm2 C−1) films, higher than that of the pristine PANI film (29.4 cm2 C−1), suggesting positive effects of the introduced nanofillers on the electrochromic performance. The areal capacitances of the films were observed to increase following the order as bare WO3 < WO3/graphene < pristine PANI < WO3/PANI < graphene/PANI < WO3/graphene/PANI films from both the cyclic voltammogram (CV) and galvanostatic charge-discharge (GCD) results. The enhanced energy storage and electrochromic performances of the PANI-based nanocomposite films can be attributed to the capacitance contributions of the introduced nanofillers, increased PANI amount, and the rougher morphology due to the embedment of the nanofillers into the PANI matrix. This extraordinary energy storage and electrochromic performances of the WO3/graphene/PANI film make it a promising candidate for combined electrochromic and energy storage applications.

Electrochemical Functionalization of Single-Walled Carbon Nanotubes Films Obtained by Electrophoretic Deposition

2012 ◽  
Vol 507 ◽  
pp. 107-111
Author(s):  
Luisa Pilan ◽  
Matei Raicopol ◽  
Celina Damian ◽  
Mariana Ioniţă
Keyword(s):  
Carbon Nanotubes ◽  
Electrophoretic Deposition ◽  
Indium Tin Oxide ◽  
Glass Plate ◽  
Single Walled Carbon Nanotubes ◽  
Diazonium Salts ◽  
Single Walled Carbon ◽  
Glass Substrates ◽  
Ito Glass ◽  
Walled Carbon Nanotubes

In this paper, we report an electrode coated with single-walled carbon nanotubes (SWCNTs) thin-film prepared by the electrophoretic deposition (EPD) technique. SWCNTs electrodes are fabricated on indium tin oxide (ITO) glass substrates using a mixture of CNTs and a cationic detergent tetraoctylammonium bromide (TOAB) in tetrahydrofuran (THF) by applying a negative voltage to the ITO glass plate. The functionalization of these nanotubes is then achieved via electrochemical reduction of aryl diazonium salts, in a manner similar to that employed for functionalization of other carbon surfaces. A variety of diazonium salts have been used, including those that provide moieties conducive to further elaboration after attachment to the nanotubes.

scholarly journals Optimized Deposition of Graphene Oxide Langmuir-Blodgett Thin Films

2014 ◽  
Vol 51 (4) ◽  
pp. 61-68 ◽  
Author(s):  
A. Dravniece ◽  
L. Gerca ◽  
K. Kundzins ◽  
K. Teivena ◽  
V. Kampars ◽  
...  
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Indium Tin Oxide ◽  
Glass Substrate ◽  
Deposition Process ◽  
Deposition Efficiency ◽  
Advanced Technique ◽  
Langmuir Blodgett ◽  
Ito Glass ◽  
Substrate Surfaces

Abstract Single sheet graphene (SG) is an innovative transparent material with high electrical and thermal conduction the use of which in transparent electrodes instead of traditional materials improves the performance of optoelectronic devices. In this study, graphene oxide (GO) has been obtained by a modified Hummer`s method followed by an advanced technique of water removal (lyophilisation). The Langmuir-Blodgett (LB) method was applied to transfer GO from suspension to substrate. To optimize the deposition process, as suspending and spreading solvents the benzene and benzene/methanol mixtures were chosen instead of previously studied water suspensions. The number of GO layers in suspension is reduced by exfoliation in order to obtain a single GO monolayer. For this purpose, sonication and centrifugation of GO sheets are carried out. Finally, the effect of variously treated glass substrate surfaces on the deposition efficiency has been studied. In the work, it is shown that ozonization of glass substrate improves the deposition outcome, while ozonization of indium tin oxide (ITO) glass substrate is necessary to perform such deposition. The obtained GO suspensions and LB thin films have been studied using a scanning electron microscope (SEM)

scholarly journals Electrodeposition-Based Fabrication and Characteristics of Tungsten Trioxide Thin Film

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Li Lin ◽  
Chin-Pao Cheng ◽  
Tun-Ping Teng
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Tungsten Trioxide ◽  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Coated Glass ◽  
Ito Glass

In this study, tungsten trioxide (WO3) thin films were electrodeposited on indium tin oxide (ITO) glass to form WO3-coated glass. The electrodeposition (ED) time (tED) and ED current (IED) were varied to control the film thickness and morphology. Furthermore, the crystallization of the thin films was controlled by annealing them at 250°C, 500°C, and 700°C. The results showed that the thickness of the WO3thin films increased withtEDandIED. The as-deposited thin films and those annealed at 250°C were amorphous, whereas the WO3thin films annealed at 500 and 700°C were in the anorthic phase. Moreover, the amorphous WO3-coated glass exhibited high transmittance in visible light and low transmittance in near-infrared light, whereas the anorthic WO3-coated glass had high transmittance in near-infrared light. An empirical formula for determining the thickness of WO3thin films was derived through multiple regressions of the ED process parameters.

scholarly journals Fabrication of Transparent ITO/Ga-Doped ZnO Coating as a Front Panel Electrode toward Efficient Thin Film Solar Cells

2020 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Mariya Aleksandrova ◽  
Tatyana Ivanova ◽  
Kostadinka Gesheva ◽  
Velichka Strijkova ◽  
Tsvetozar Tsanev ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Visible Region ◽  
Optical Transmittance ◽  
Front Panel ◽  
Visible Range ◽  
Infrared Range ◽  
Electromagnetic Spectrum

Bi-layer coatings from sputtered indium tin oxide (ITO) and gallium doped zinc oxide (Ga:ZnO) were investigated for transparency in the visible range of the electromagnetic spectrum, optical rejection ability in the near infrared spectrum and conductivity for the novel quantum dot-based solar cells. The multilayer stack produced at optimal oxygen partial pressure exhibits improved optical properties without worsening the electrical ones, even after additional oxidation during the reactive sputtering of the metal-oxides. With a mean optical transmittance of 91.3% in the visible region, mean optical rejection greater than 65% in the infrared range and resistivity lower than 0.4 × 10−2 Ω.cm, this coating is good candidate for front panel electrode in the CdS/ZnS core-shell quantum dot-based solar cells.

scholarly journals Near infrared photothermoelectric effect in transparent AZO/ITO/Ag/ITO thin films

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
C. Bianchi ◽  
A. C. Marques ◽  
R. C. da Silva ◽  
T. Calmeiro ◽  
I. Ferreira
Keyword(s):  
Indium Tin Oxide ◽  
Near Infrared ◽  
Thermal Control ◽  
High Energy ◽  
Visible Range ◽  
Azo Thin Film ◽  
Ito Thin Films ◽  
Aluminum Doped Zinc Oxide ◽  
Temperature Constant ◽  
20 Nm

AbstractA new concept of oxide-metal-oxide structures that combine photothermoelectric effect with high reflectance (~ 80%) at wavelengths in the infrared (> 1100 nm) and high transmittance in the visible range is reported here. This was observed in optimized ITO/Ag/ITO structure, 20 nm of Silver (Ag) and 40 nm of Indium Tin Oxide (ITO), deposited on Aluminum doped Zinc Oxide (AZO) thin film. These layers show high energy saving efficiency by keeping the temperature constant inside a glazed compartment under solar radiation, but additionally they also show a photothermoelectric effect. Under uniform heating of the sample a thermoelectric effect is observed (S = 40 mV/K), but when irradiated, a potential proportional to the intensity of the radiation is also observed. Therefore, in addition to thermal control in windows, these low emission coatings can be applied as transparent photothermoelectric devices.

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