A Porous TiO2-Based Two-Layer Anode with Improved Performance Manufactured By Large Area Layer-By-Layer Spray Processing

2016 ◽  
Keyword(s):  
Layer By Layer ◽  
Large Area ◽  
Porous Tio2 ◽  
Spray Processing ◽  
Improved Performance

scholarly journals Fabrication of Demineralized Bone Matrix/Polycaprolactone Composites Using Large Area Projection Sintering (LAPS)

2019 ◽  
Vol 3 (2) ◽  
pp. 30 ◽  
Author(s):  
Mohsen Ziaee ◽  
Rebecca Hershman ◽  
Ayesha Mahmood ◽  
Nathan B. Crane
Keyword(s):  
Additive Manufacturing ◽  
Cancellous Bone ◽  
Demineralized Bone Matrix ◽  
Bone Matrix ◽  
Bone Allograft ◽  
Layer By Layer ◽  
Large Area ◽  
Manufacturing Method ◽  
Synthetic Scaffolds ◽  
Demineralized Bone

Cadaveric decellularized bone tissue is utilized as an allograft in many musculoskeletal surgical procedures. Typically, the allograft acts as a scaffold to guide tissue regeneration with superior biocompatibility relative to synthetic scaffolds. Traditionally these scaffolds are machined into the required dimensions and shapes. However, the geometrical simplicity and, in some cases, limited dimensions of the donated tissue restrict the use of allograft scaffolds. This could be overcome by additive manufacturing using granulated bone that is both decellularized and demineralized. In this study, the large area projection sintering (LAPS) method is evaluated as a fabrication method to build porous structures composed of granulated cortical bone bound by polycaprolactone (PCL). This additive manufacturing method utilizes visible light to selectively cure the deposited material layer-by-layer to create 3D geometry. First, the spreading behavior of the composite mixtures is evaluated and the conditions to attain improved powder bed density to fabricate the test specimens are determined. The tensile strength of the LAPS fabricated samples in both dry and hydrated states are determined and compared to the demineralized cancellous bone allograft and the heat treated demineralized-bone/PCL mixture in mold. The results indicated that the projection sintered composites of 45–55 wt %. Demineralized bone matrix (DBM) particulates produced strength comparable to processed and demineralized cancellous bone.

Fabrication of porous TiO2 films using a spongy replica prepared by layer-by-layer self-assembly method: Application to dye-sensitized solar cells

2006 ◽  
Vol 499 (1-2) ◽  
pp. 396-401 ◽  
Author(s):  
Yosuke Tsuge ◽  
Kohei Inokuchi ◽  
Katsuhiro Onozuka ◽  
Ohno Shingo ◽  
Shinichiro Sugi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Self Assembly ◽  
Dye Sensitized Solar Cells ◽  
Layer By Layer ◽  
Tio2 Films ◽  
Porous Tio2 ◽  
Dye Sensitized ◽  
Assembly Method ◽  
Sensitized Solar Cells

Area-scaling of Organic Solar Cells and Integrated Modules

2009 ◽  
Vol 1212 ◽  
Author(s):  
Seungkeun Choi ◽  
William J Potscavage ◽  
Bernard Kippelen
Keyword(s):  
Solar Cells ◽  
Current Density ◽  
Tin Oxide ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Series Resistance ◽  
Large Area ◽  
In Series ◽  
Improved Performance ◽  
Number Of Cells

AbstractWe report on the improved performance of large-area organic solar cells and modules by integrating metal grids directly with the indium tin oxide (ITO), thereby reducing the series resistance contribution from the ITO. Devices with different areas (0.1, 7, and 36.4 cm2) were prepared to study the area-dependency of the organic solar cells based on pentacene and C60 heterojunctions. Modules were prepared in which four individual cells (7 cm2) were connected in series and parallel. For the series connected modules, VOC scales linearly with the number of cells while parallel connected modules exhibited multiplied current density as expected.

scholarly journals A Facile Route to the Preparation of Highly Uniform ZnO@TiO2 Core-Shell Nanorod Arrays with Enhanced Photocatalytic Properties

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Yuanyuan Zhao ◽  
Peifei Tong ◽  
Dong Ma ◽  
Bing Li ◽  
Qinzhuang Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Shell Structure ◽  
Photocatalytic Decomposition ◽  
Thermal Method ◽  
Core Shell ◽  
Layer By Layer ◽  
Nanorod Arrays ◽  
Large Area ◽  
Core Shell Structure ◽  
Highly Uniform

Design and synthesis of ZnO@TiO2 core-shell nanorod arrays as promising photocatalysts have been widely reported. However, it remains a challenge to develop a low-temperature, low-cost, and environmentally friendly method to prepare ZnO@TiO2 core-shell nanorod arrays over a large area for future device applications. Here, a facile, green, and efficient route is designed to prepare the ZnO@TiO2 nanorod arrays with a highly uniform core-shell structure over a large area on Zn wafer via a vapor-thermal method at relatively low temperature. The growth mechanism is proposed as a layer-by-layer assembly. The photocatalytic decomposition reaction of methylene blue (MB) reveals that the ZnO@TiO2 core-shell nanorod arrays have excellent photocatalytic activities when compared with the performance of the ZnO nanorod arrays. The improved photocatalytic activity could be attributed to the core-shell structure, which can effectively reduce the recombination rate of electron-hole pairs, significantly increase the optical absorption range, and offer a high density of surface active catalytic sites for the decomposition of organic pollutants. In addition, it is very easy to separate or recover ZnO@TiO2 core-shell nanorod array catalysts when they are used in water purification processes.

Light Emitting thin Film Devices Based on Self-assembled Multilayer Heterostructures of PPV

1995 ◽  
Vol 413 ◽  
Author(s):  
M. Ferreira ◽  
O. Onitsuka ◽  
A. C. Fou ◽  
B. Hsieh ◽  
M. F. Rubner
Keyword(s):  
Thin Film ◽  
Carrier Transport ◽  
Thermal Conversion ◽  
Layer By Layer ◽  
Light Emitting ◽  
Hole Transporting ◽  
Improved Performance ◽  
And Performance ◽  
P Type ◽  
Thin Film Devices

ABSTRACTPPV based light emitting thin film devices were fabricated using a layer-by-layer deposition technique involving the alternate spontaneous adsorption of a PPV precursor polymer and either poly(styrene-4-sulfonate) (SPS) or poly(methacrylic acid) (PMA). It was demonstrated that the polyanion used to self-assemble the PPV precursor strongly influences the characteristics and performance of the resulting LEDs. Devices fabricated with PPV created in the presence of SPS exhibited symmetric I–V curves, low luminance levels and very high current densities while PPV/PMA devices exhibited luminance levels in the range of 10–60 cd/m2 and classical rectifying behavior. These dramatic differences are primarily due to a low level of p-type doping activated during the thermal conversion of PPV and/or during device operation that confers excellent hole carrier transport capabilities to the PPV/SPS combination. Fabrication of a multi-slab type heterostructure device comprised of a PPV/SPS block (hole transporting block) and a PPV/PMA block (emitting block) resulted in improved performance with luminance levels significantly higher than previously obtained for a single slab PPV/PMA device (typically > 100 cd/m2). It was also demonstrated that the presence of very thin (about 20–30 Å thick) insulating layers at the Al/polymer interface improves device efficiency by a factor of 2–4.

Design and Implementation of Colloidal Quantum Dot Field-Effect Transistors

2014 ◽  
Vol 668-669 ◽  
pp. 818-821
Author(s):  
Hai Yan Wang ◽  
Ya Ting Zhang ◽  
Xiao Xian Song ◽  
Lu Fan Jin ◽  
Hai Tao Dai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Field Effect Transistors ◽  
Low Cost ◽  
Structure Design ◽  
Layer By Layer ◽  
Gate Bias ◽  
Large Area ◽  
Photoconductive Detectors ◽  
Pbs Quantum Dots

With the breakthrough of mobility in quantum dot electric field transistors (Q-EFTs), the potential application in these functional devices has revealed and been paid more attentions, due to flexibility in design, low cost, facility for processing and large area. One of the most important applications of FETs is the photoconductive detector. However, these functional FETs have less been reported. In this work, colloidal PbS Q-FETs were successfully fabricated by reasonable structure design and layer-by-layer depositon technique PbS quantum-dots. The bipolar property was demonstrated by the output and transfer characteristics, as devices work in I and III quadrants simultaneously. The mobilities of electron and hole are 0.16 cm2/(V⋅s) and 0.28 cm2/(V⋅s), respectively. Q-FETs work as photoconductive detectors at both positive and negative gate bias voltages. Under constant gate bias, photocurrent increase exponentially with the intensity of light. The responding region consisted with the absorption range of PbS quantum dots. A linearity was found in drain voltage and incidence of laser power, the ratio was attributing to 0.0019 (μW⋅V)-1.

scholarly journals Enhancing the 3rd order nonlinear optical response of integrated micro-ring resonators with graphene oxide 2D films

2021 ◽  
Author(s):  
David Moss
Keyword(s):  
Graphene Oxide ◽  
Pump Power ◽  
Nonlinear Optical ◽  
Kerr Nonlinearity ◽  
Ring Resonators ◽  
Layer By Layer ◽  
Large Area ◽  
Strong Light ◽  
Precise Control ◽  
Lift Off

Abstract Layered two-dimensional (2D) graphene oxide (GO) films are integrated with micro-ring resonators (MRRs) to experimentally demonstrate enhanced nonlinear optics in the form of four-wave mixing (FWM). Both uniformly coated and patterned GO films are integrated on CMOS-compatible doped silica MRRs using a large-area, transfer-free, layer-by-layer GO coating method together with photolithography and lift-off processes, yielding precise control of the film thickness, placement, and coating length. The high Kerr nonlinearity and low loss of the GO films combined with the strong light-matter interaction within the MRRs results in a significant improvement in the FWM efficiency in the hybrid MRRs. Detailed FWM measurements are performed at different pump powers and resonant wavelengths for the uniformly coated MRRs with 1 − 5 layers of GO as well as the patterned devices with 10 − 50 layers of GO. The experimental results show good agreement with theory, achieving up to ~ 7.6-dB enhancement in the FWM conversion efficiency (CE) for an MRR uniformly coated with 1 layer of GO and ~ 10.3-dB for a patterned device with 50 layers of GO. By fitting the measured CE as a function of pump power for devices with different numbers of GO layers, we also extract the dependence of GO’s third-order nonlinearity on layer number and pump power, revealing interesting physical insights about the evolution of the layered GO films from 2D monolayers to quasi bulk-like behavior. These results confirm the high nonlinear optical performance of integrated photonic resonators incorporated with 2D layered GO films.

Large-area and transparent antifogging polymeric coatings via highly efficient and facile layer-by-layer assembly

2019 ◽  
Vol 77 ◽  
pp. 105907 ◽  
Author(s):  
Jianfu Zhang ◽  
Liping Jiang ◽  
Wentao Zhao ◽  
Zhengjun Yang ◽  
Heran Nie ◽  
...  
Keyword(s):  
Layer By Layer ◽  
Polymeric Coatings ◽  
Large Area ◽  
Highly Efficient ◽  
Layer By Layer Assembly ◽  
Layer Assembly

Enhanced optical four-wave-mixing in integrated ring resonators with graphene oxide films

2020 ◽  
Author(s):  
David Moss ◽  
Jiayang Wu ◽  
xingyuan xu ◽  
Yunyi Yang ◽  
linnan jia ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Pump Power ◽  
Kerr Nonlinearity ◽  
Four Wave Mixing ◽  
Ring Resonators ◽  
Layer By Layer ◽  
Wave Mixing ◽  
Large Area ◽  
Strong Light ◽  
Lift Off

Layered two-dimensional (2D) graphene oxide (GO) films are integrated with micro-ring resonators (MRRs) to experimentally demonstrate enhanced nonlinear optics in the form of four-wave mixing (FWM). Both uniformly coated and patterned GO films are integrated on CMOS-compatible doped silica MRRs using a large-area, transfer-free, layer-by-layer GO coating method together with photolithography and lift-off processes, yielding precise control of the film thickness, placement, and coating length. The high Kerr nonlinearity and low loss of the GO films combined with the strong light-matter interaction within the MRRs results in a significant improvement in the FWM efficiency in the hybrid MRRs. Detailed FWM measurements are performed at different pump powers and resonant wavelengths for the uniformly coated MRRs with 1−5 layers of GO as well as the patterned devices with 10−50 layers of GO. The experimental results show good agreement with theory, achieving up to ~7.6-dB enhancement in the FWM conversion efficiency (CE) for an MRR uniformly coated with 1 layer of GO and ~10.3-dB for a patterned device with 50 layers of GO. By fitting the measured CE as a function of pump power for devices with different numbers of GO layers, we also extract the dependence of GO’s third-order nonlinearity on layer number and pump power, revealing interesting physical insights about the evolution of the layered GO films from 2D monolayers to quasi bulk-like behavior. These results confirm the high nonlinear optical performance of integrated photonic resonators incorporated with 2D layered GO films.

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