Visible Light Photoreduction Properties of N-Doped TiO2 Nanostructured Films

2008 ◽  
Vol 368-372 ◽  
pp. 1486-1488
Author(s):  
Xiao Meng Wu ◽  
Yun Han Ling ◽  
Yin Li ◽  
Zhao Hui Huang
Keyword(s):  
Stainless Steel ◽  
Surface Morphology ◽  
Visible Light ◽  
Spin Coating ◽  
Photocatalytic Performance ◽  
Coating Process ◽  
Nanostructured Films ◽  
Spin Coating Process ◽  
Nanostructured Composite ◽  
Steel Substrates

N-doped TiO2 nanostructured composite (TiO2-N) films with excellent photocatalytic performance under visible light were successfully formed on glass and stainless steel substrates by spin-coating process. The photoreduction performance of as-prepared coatings was characterization by reduction of Ag+ and measurement of photovoltaic response. It was found that Ag+ can be easily reduced to metallic Ag and obvious photocurrent and photovoltage were observed by V-I recording under visible light irradiation. Crystalline structure, nitrogen states in the lattice, composition and surface morphology of the nanostructured films were analyzed by XRD, XPS and SEM.

scholarly journals Polymorphs of Neodymium Niobate and Tantalate Thin Films Prepared by Sol-Gel Method

2019 ◽  
Vol 19 (1) ◽  
pp. 34-43
Author(s):  
H. Bruncková ◽  
Ľ. Medvecký ◽  
E. Múdra ◽  
A. Kovalčiková
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Surface Morphology ◽  
Spin Coating ◽  
Sol Gel ◽  
Coating Process ◽  
Spin Coating Process ◽  
Gel Method ◽  
Afm Analysis ◽  
Thin Film Devices

AbstractNeodymium niobate NdNbO4 (NNO) and tantalate NdTaO4 (NTO) thin films (~100 nm) were prepared by sol-gel/spin-coating process on Pb(Zr0.52Ti0.48)O3/Al2O3 substrates with annealing at 1000°C. The precursors of films were synthesized using Nb or Ta tartrate complexes. The XRD results of NNO and NTO films confirmed tetragonal T-NdNbO4 and T-NdTaO4 phases, respectively, with traces of monoclinic MNdNbO4 and M´-NdTaO4. The surface morphology and topography were investigated by SEM and AFM analysis. NTO was smoother with roughness 5.24 nm in comparison with NNO (6.95 nm). In the microstructure of NNO, small spherical (~ 20-50 nm) T-NdNbO4 and larger needle-like particles (~100 nm) of M-NdNbO4 phase were observed. The compact clusters composed of fine spherical T-NdTaO4 particles (~ 50 nm) and cuboidal M´-NdTaO4 particles (~ 100 nm) were found in NTO. The results of this work can contribute to formation of different polymorphs of films for the application in environmental electrolytic thin film devices.

scholarly journals Phase Composition of Samarium Niobate and Tantalate Thin Films Prepared by Sol-Gel Method

2017 ◽  
Vol 17 (1) ◽  
pp. 10-20
Author(s):  
H. Bruncková ◽  
Ľ. Medvecký ◽  
E. Múdra ◽  
A. Kovalčiková ◽  
J. Ďurišin ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Phase Composition ◽  
Surface Morphology ◽  
Spin Coating ◽  
Sol Gel ◽  
Coating Process ◽  
Spin Coating Process ◽  
Afm Analysis ◽  
Thin Film Devices

Abstract Samarium niobate SmNbO4 (SNO) and tantalate SmTaO4 (STO) thin films (~100 nm) were prepared by sol-gel/spin-coating process on alumina substrates with PZT interlayer and annealing at 1000°C. The precursors of films were synthesized using Nb or Ta tartrate complexes. The improvement of the crystallinity of monoclinic M′-SmTaO4 phase via heating was observed through the coexistence of small amounts of tetragonal T-SmTa7O19 phase in STO precursor at 1000°C. The XRD results of SNO and STO films confirmed monoclinic M-SmNbO4 and M′-SmTaO4 phases, respectively, with traces of orthorhombic O-SmNbO4 (in SNO). In STO film, the single monoclinic M′-SmTaO4 phase was revealed. The surface morphology and topography of thin films were investigated by SEM and AFM analysis. STO film was smoother with roughness 3.2 nm in comparison with SNO (6.3 nm). In the microstructure of SNO film, small spherical (~50 nm) and larger cuboidal particles (~100 nm) of the SmNbO4 phase were observed. In STO, compact clusters composed of fine spherical SmTaO4 particles (~20-50 nm) were found. Effect of samarium can contribute to the formation different polymorphs of these films for the application to environmental electrolytic thin film devices.

Sodium chloride methanol solution spin-coating process for bulk-heterojunction polymer solar cells

2016 ◽  
Vol 25 (8) ◽  
pp. 088801
Author(s):  
Tong-Fang Liu ◽  
Yu-Feng Hu ◽  
Zhen-Bo Deng ◽  
Xiong Li ◽  
Li-Jie Zhu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Sodium Chloride ◽  
Spin Coating ◽  
Bulk Heterojunction ◽  
Polymer Solar Cells ◽  
Methanol Solution ◽  
Coating Process ◽  
Spin Coating Process

scholarly journals Correlation between the Morphology of ZnO Layers and the Electroluminescence of Quantum Dot Light-Emitting Diodes

2019 ◽  
Vol 9 (21) ◽  
pp. 4539 ◽  
Author(s):  
Seongkeun Oh ◽  
Jiwan Kim
Keyword(s):  
Quantum Dot ◽  
Spin Coating ◽  
Light Emitting Diodes ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Coating Process ◽  
Inverted Structure ◽  
Light Emitting ◽  
Spin Coating Process ◽  
Ito Glass

The present work shows the effect of the ZnO layer morphology on inverted quantum dot light-emitting diodes (QLEDs) using different spin-coating processes. In the inverted structure of ITO/ZnO/QDs/CBP/MoO3/Al, ZnO nanoparticles were used as the electron transport layer. The utilization of a two-step spin-coating process to deposit a ZnO layer on a patterned ITO glass substrate resulted in an increase in the surface roughness of the ZnO layer and a decrease in the luminance of the QLEDs. However, the current efficiency of the device was enhanced by more than two-fold due to the reduced current density. Optimization of the ZnO spin-coating process can efficiently improve the optical and electrical properties of QLEDs.

scholarly journals Uniform and bright light emission from a 3D organic light-emitting device fabricated on a bi-convex lens by a vortex-flow-assisted solution-coating method

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Byoungchoo Park ◽  
Seo Yeong Na ◽  
In-Gon Bae
Keyword(s):  
Spin Coating ◽  
Vortex Flow ◽  
Line Tension ◽  
Fluorescent Light ◽  
Coating Process ◽  
Coating Solution ◽  
Light Emitting ◽  
Spin Coating Process ◽  
Convex Lens ◽  
Organic Light

AbstractWe herein present the results of a study on the novel fabrication process of uniform and homogeneous semiconducting polymer layers, in this case hole-injecting and fluorescent light-emitting layers that were produced by a simple solution-coating process for 3D conformal organic light-emitting diodes (3D OLEDs) on curvilinear surfaces. The solution-coating process used was a newly developed method of vortex-flow-assisted solution-coating with the support of spinning of the coating solution. It is shown that the vortex-flow-assisted spin-coating process can produce high-quality thin films at nanoscale thicknesses by controlling the liquid surface of the coating solutions, which can easily be adjusted by changing the spinning speed, even on complex curvilinear surfaces, i.e., a quasi-omnidirectional coating. This excellent film-forming ability without any serious film defects is mainly due to the reduction of line tension among the solution, air, and the substrate at the contact line due to vortex flows of the coating solution on the substrate during the vortex-spin-coating process. As a proof of concept, we present vortex-spin-coated 3D OLEDs fabricated on bi-convex lens substrates which exhibit excellent device performance with high brightness and current efficiency levels comparable to those of a conventional spin-coated 2D planar OLED on a flat substrate. It is also shown that the EL emission from the 3D OLED on the bi-convex lens substrate exhibits a diffusive Lambertian radiation pattern. The results here demonstrate that the vortex-flow-assisted spin-coating process is a promising approach for producing efficient and reliable next-generation OLEDs for 3D conformal opto-electronics.

Travelling wave solutions for a thin-film equation related to the spin-coating process

2017 ◽  
Vol 29 (3) ◽  
pp. 369-392 ◽  
Author(s):  
M. V. GNANN ◽  
H. J. KIM ◽  
H. KNÜPFER
Keyword(s):  
Contact Line ◽  
Spin Coating ◽  
Travelling Wave ◽  
Global Maximum ◽  
Coating Process ◽  
Average Height ◽  
Qualitative Properties ◽  
Spin Coating Process ◽  
Line Region ◽  
Thin Film Equation

We study a problem related to the spin-coating process in which a fluid coats a rotating surface. Our interest lies in the contact-line region for which we propose a simplified travelling wave approximation. We construct solutions to this problem by a shooting method that matches solution branches in the contact-line region and in the interior of the droplet. Furthermore, we prove uniqueness and qualitative properties of the solution connected to the fourth-order nature of the equation, such as a global maximum in the film height close to the contact line, elevated from the average height of the film.

A facile approach to alleviate photochemical degradation in high efficiency polymer solar cells

2015 ◽  
Vol 3 (31) ◽  
pp. 16313-16319 ◽  
Author(s):  
Wenchao Huang ◽  
Eliot Gann ◽  
Zai-Quan Xu ◽  
Lars Thomsen ◽  
Yi-Bing Cheng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Chemical Stability ◽  
Spin Coating ◽  
High Efficiency ◽  
Polymer Solar Cells ◽  
Simple Approach ◽  
Coating Process ◽  
Photochemical Degradation ◽  
Solvent Treatment ◽  
Spin Coating Process

We report a simple approach to significantly improve the chemical stability of high efficiency PBDTTT-EFT:PC71BM solar cells. The introduction of an anti-solvent treatment during the spin-coating process induces the fast deposition of the active layer and the prompt removal of residual DIO from the film.

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