Papers by Keyword: Post-Treatment

Abstract: Transparent flexible electrodes (TFEs) are extremely crucial for expanding flexible and wearable electronic devices. Silver nanowires (AgNWs) have been extensively investigated as an alternative to replace Indium Tin Oxide (ITO) as a commercial TFE due to their high conductivity, transparency, and flexibility. AgNWs have replaced ITO-based electrodes as the preferred approach in flexible, transparent, and conductive electrodes (FTCE). AgNWs outperform other materials, such as Reduced Graphene Oxide (RGO), ceramic material, Carbon Nanotubes (CNT), and conductive polymers, in terms of electrical conductivity, transmittance, flexibility, and low sheet resistance. Numerous techniques, including as electrospinning, spray coating, spin coating, and doctor blades, are used to use AgNWs as flexible substrates. Seed-based growth and template-assisted synthesis are two fundamental synthesis techniques that could be used to generate AgNWs. However, poor adhesiveness, and thermal and electrical stability, begin to be bottlenecks for AgNWs as high deployment in a variety of devices. So AgNWs synthesis process began to shift to other methods, such as wet chemical and polyol. In this paper, short and clear summary of various advances including post-treatment methods such as UV radiation, microwave, sonication, quenching, and so on is conducted to be one step forward to test mechanical properties and to improve AgNWs performance.

Abstract: Vertically aligned nanorods ZnO have been deposited hydrothermally on the pre-coated ZnO seeded-glass substrates. Enhanced vertical alignment is achieved as a result of combined film post-treatments. Dipped-drawn and immersed-washing the as-synthesized ZnO films in water as well as quenching of the hydrothermal were proposed to hinder excessive deposition and engineer the growth of ZnO nanorods. The XRD patterns shows suppressed growth of ZnO crystallite along (101) with increased textural coefficients on (002), TC₀₀₂, from 3.94 to 5.23. Dense vertically aligned bundles of ZnO nanorods may reach up to 0.75 μm length. Bandgap energy of the resulted ZnO nanorod thin films were ranging from 3.69 to 3.79 eV, wider than those of bulk ZnO. Hydrothermal technique with simple post-treatments of immersed-washing and hydrothermal quenching has offered robust and efficient method to prepare vertically-aligned 1-D ZnO nanorods potential as photoanodes for dye-sensitized solar cells.

Abstract: A mesoporous TiO₂ photo-electrode for dye-sensitized solar cells (DSSCs) was fabricated by an electrospray method using a solution of dispersed TiO₂ nanocrystals (P25). A mesoporous TiO₂ disk has a larger surface area than P25. The sub micrometer-sized TiO₂ disk promotes light scattering, thereby increasing the photocurrent conversion efficiency. However, the electrosprayed TiO₂ electrodes have many pores and disconnected electron pathways. Thus, we investigated the enhanced electrical contact of an electrosprayed TiO₂ electrode using a hot-pressing process and a titanium tetrachloride (TiCl₄) treatment process. After optimizing the post-treatment process of an electrosprayed TiO₂ electrode, the cell shows conversion efficiency up to 6% at standard sunlight of AM 1.5.

Abstract: Efficient light management in solar cells can be achieved by incorporating plasmonic nanoscatterers that support surface plasmons: excitations of conduction electrons at the interface/surface. As known, light trapping increases the amount of light absorbed by bouncing the light within the cell, giving it a chance to be absorbed thereby increasing the absorption and scattering cross-section. The challenge is to fabricate these plasmonic nanoparticles in cost-effective method as well as without hampering optical, electrical and topographical properties of underneath layers. Here in this report a simple two step method was adopted to fabricate silver nanoparticles on zinc oxide followed by topographic and elemental analysis thereof. Numerical calculation was carried out to elucidate optical scattering of silver nanoparticles of various sizes as well as that of dimer. Near-electric field distribution of single silver nanoparticles and dimer along with the individual component of electric field was simulated by finite different time domain analysis. Using the benefit of increased scattering cross-section and ease of such nanoparticles fabrication, a cell configure is proposed herewith.

Abstract: The influence of thermal post-treatment by means of flame and laser energy on the mechanical properties of NiCrBSi coating was studied. The evaluation was done in terms of microstructure, surface hardness, microhardness and instrumented indentation. The microstructure evaluation showed an increase of coatings inner cohesion, together with the creation of metallurgical bond between the coating and the substrate material. In the the case of laser remelted coating, the creation of thick transition layer responsible for lower measured microhardness and hardness value was proved.

Abstract: corrosions on gathering and long-distance pipelines in high sour gas field are often found on the HAZ, coarse grained region is the weakest region in the HAZ. We got L415 Pipelines coarse grained region of different heat inputs and post-treatments by welding thermal simulation, researched microstructures, hardness, impact energy and fracture, the result showed that, when the heat input is 25KJ/Cm, followed by annealing treatment with temperature 700°C for 1 hour, we can get good mechanical properties of coarse grained region.

Abstract: Iinteractions of copper and wood components in the ACQ-D treated Chinese fir (Cunninghamia lanceolata Hook.) after hot water and hot air post-treatments were studied by using Fourier transform infrared spectroscopy (FTIR). Compared to Chinese fir (Cunninghamia lanceolata Hook.) without any treatments, significant reduction was noted at 1735±5 cm-1 assigned to carboxylic groups in the hemicellulose in all the samples with different post-treatments. The intensity of bands at 1655±5cm-1, 1510±5 cm-1 and 1265±5cm-1 are assigned to ketone carbonyl stretching groups, aromatic skeletal vibration and acetyl ether linkage in lignin were also decreased after different post-treatments compared to untreated Chinese fir. These results imply the fixation reactions of copper in the treated wood have been promoted by the post-treatment conditions, and the major bonding sites of copper in the treated wood are located in the wood lignin and hemicellulose.

Abstract: A simple and rapid technique to synthesize LiFePO4 by microwave-solvothermal method assisted a short time post-treatment was described. The crystal structure and the charge-discharge performance of the prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic charge-discharge testing. The results indicated that this rapid synthesis technique by microwave-solvothermal method combined short time post-treatment was an effective way to obtain LiFePO4 with a single olivine-type crystal structure and small particle size. The electrochemical research indicated that the resulting LiFePO4/C composite could deliver 141.7mAh•g-1 at 0.1C at 25 °C and showed good stability retaining 97% after 45 cycles.

Abstract: In this paper, we employed Methanol, 75% Ethanol, 100%Ethanol, and Isopropanol to treat electrospun SF nanofiber mats, and studied the morphology, structure and property of SF nanofiber before and after treatment by means of SEM, and FTIR. While the as-spun SF nanofiber mats consisted of α-helix and random coil, post-treatment of the SF nanofiber resulted in significant increase in β-sheet component and improvement of water resistance of the SF nanofiber mats. This effect was not obvious affected when different post-treatment system was used, but methanol and 75% was more effective in inducing conformation transition from α-helix and random coil to β-sheet.

Abstract: In order to improve water-resistant ability silk fibroin (SF) and SF/P(LLA-CL) blended nanofibrous scaffolds for tissue engineering applications, methanol vapor were used to treat electrospun nanofibers. SEM indicated SF and SF/ P(LLA-CL) scaffolds maintained nanofibrous structure after treated with methanol vapor and possessed good water-resistant ability. Characterization of ¹³C NMR clarified methanol vapor induced SF conformation from random coil or α- helix to β-sheet. Moreover, treated SF/ P (LLA-CL) nanofibrous scaffolds still kept good mechanical properties. Methanol vapor could be ideal method to treat SF and SF/ P(LLA-CL) nanofibrous scaffolds for biomedical applications.