Properties of fluorine-doped SnO2 thin films by a green sol–gel method

Fluorine doped tin oxide (FTO) films were fabricated on a glass substrate by a green sol–gel dip-coating process. Non-toxic SnF₂ was used as fluorine source to replace toxic HF or NH₄F. Effect of SnF₂ content, 0–10 mol%, on structure, electrical resistivity, and optical transmittance of the films were investigated using X-ray diffraction, Hall effect measurements, and UV–vis spectra. Structural analysis revealed that the films are polycrystalline with a tetragonal crystal structure. Grain size varies from 43 to 21 nm with increasing fluorine concentration, which in fact critically impacts resultant electrical and optical properties. The 500 °C-annealed FTO film containing 6 mol% SnF₂ shows the lowest electrical resistivity 7.0×10⁻⁴ Ω cm, carrier concentration 1.1×10²¹ cm⁻³, Hall mobility 8.1 cm²V⁻¹ s⁻¹, optical transmittance 90.1% and optical band-gap 3.91 eV. The 6 mol% SnF₂ added film has the highest figure of merit 2.43×10⁻² Ω⁻¹ which is four times higher than that of un-doped FTO films. Because of the promising electrical and optical properties, F-doped thin films prepared by this green process are well-suited for use in all aspects of transparent conducting oxide.     

丙纶织物涂层整理的研究

本文研究了以天然胶乳为涂层剂、多硫化物为交联剂的胶乳体系在丙纶织物上的涂层加工工艺 ,采用浸渍涂层工艺流程 ,交联剂占天然胶乳的 5%时 ,涂层烘燥温度为 1 0 5℃ ,烘燥时间为 1 0min时得到较好的丙纶篷布的涂层效果。     

Graphene and graphene oxide-coated polyamide monofilament yarns for fiber-shaped flexible electrodes

In this study, polyamide monofilament yarn of 3000 tex was coated with graphene oxide (GO) nanomaterial using dip-coating method. The graphene oxide layer was then reduced with green chemical reduction method, resulting in a reduced graphene oxide-coated monofilament yarn. The properties of the graphene oxide and reduced graphene oxide-coated polyamide monofilament yarns were characterized by performing physical, electrical, optical, and morphological investigations. The lowest sheet resistance was measured from seven-layer graphene-coated polyamide monofilament yarn as 3.09 kΩ/sq. Moreover, it was measured that 90° and 180° bent seven-layer graphene-coated polyamide monofilament yarns had 3.57 and 3.81 kΩ/sq sheet resistance, respectively. Additionally, while PA monofilament yarn has 73.5% transmittance at 550 nm; seven-layer GO and seven-layer graphene have 18.8 and 4.5%, respectively, as expected. On the other hand, the contact angle increased with the reduction of graphene oxide layer on monofilament yarn. The fabricated graphene-coated polyamide monofilament yarns can be used in electrotextiles, solar cells, sensors, and OLEDs as fiber-shaped flexible electrodes.     

注浆成型制备阳极支撑型SOFC及其性能

采用传统的注浆成型法制备Ni基复合阳极,然后在阳极上浸渍YSZ薄膜,高温1400℃烧结4h,得到厚度约6μm且无孔致密的YSZ膜,将LSM和YSZ调制成浆料做复合阴极,并对电池的微观结构和相关性能进行测试。电池以加湿氢气为燃料,控制氢气流量为75mL/min,空气作为氧化剂,测量温度在600～850℃,电池最高比功率在850,800,750,700,650℃和600℃时可达0.77,0.54,0.33,0.17,0.09W/cm2和0.04W/cm2。     

One-step dip-coating method for preparation of ceramic nanofiber membrane with high permeability and low cost

Ceramic nanofiber membrane (CNM) based on attapulgite (APT) without any intermediate layer neither any cracks was fabricated by a one-step dip-coating method. The effects of sintering temperature and dip-coating time on the physicochemical properties and performances of prepared CNMs were investigated. The increase of the sintering temperature up to 700 °C reduced the bending strength, porosity and chemical stability of APT-based CNMs. Meanwhile, with the dip-coating time increased, the membrane thickness increased thereafter reduced. The APT-based CNM fabricated at a sintering temperature of 600 °C and with a dip-coating time of 15 s had an average pore size of 20.4 nm, high porosity (above 60 %), good permeability of 118 L/m² h bar and a rejection of 96.6 % polymers with a molecule weight of 600 kDa. All these properties clearly suggest the practicability of the one-step dip-coating method to prepare ceramic nanofiber membranes.     

Uniformity control and ultra-micropore development of tubular carbon membrane for light gas separation

Tubular carbon molecular sieve (CMS) membranes have been recognized as a potential module for commercial application due to its high mechanical strength and large surface area. However, the carbon layer uniformity was restricted by substrate texture and dope fluidity when the dip-coating method was used. This study evaluated the influence of various parameters of dip-coating with an integrated vacuum-assisted system, including solvent vaporization rates, vertical immersion/withdrawal velocity, vacuum degree, dope composition, coating cycles on the microstructure, and gas separation performance of CMS membranes. Using vacuum assistance and a low-vaporization solvent minimized the influence of viscosity and gravity on dope fluidity as a result of fast phase inversion. The as-prepared tubular CMS membranes showed enhanced perm-selectivity according to a H₂/N₂ gas selectivity of 8.8, a CO₂/N₂ gas selectivity of 6.7, a H₂ permeability of 464 barrer, and a CO₂ permeability of 356 barrer.     

基于微结构制作的溶胶凝胶浸渍成膜特性

针对制作溶胶 凝胶 (sol gel)微光学元件的需要 ,对溶胶 凝胶浸渍提拉成膜过程中膜厚、均匀性等成膜特性进行了仔细考察。对于室温干燥情况 ,提拉成膜厚度与提拉速度的经验关系为 :低速时膜厚与提拉速度呈 1 2次幂关系 ;高速时则偏离以上关系 ,且随速度的增大 ,膜厚增加缓慢。对成膜过程的分析表明 ,挥发过程对溶胶 凝胶提拉成膜厚度的影响是重要的     

Sol–gel deposition and optical characterization of multilayered SiO2/Ti1−xSixO2 coatings on solar collector glasses

Thin films of silicon oxide and silicon titanium mixed oxides are deposited on solar collector glazing in a sol–gel dip-coating process based on alcoxide precursors. Spectrophotometry is used to characterize the relation of film thickness and withdrawal speed for the precursor solutions, and to determine the refractive index of individual layers of the mixed oxides. The inferred dispersion relations n(λ) are compared to the predictions of effective medium theories. Based on the knowledge of the optical properties of individual layers, multilayer interference stacks are designed. Multilayered samples of superior quality are deposited by sol–gel dip-coating in a particle-free environment. The final optical performance of the multilayer stacks are characterized in terms of the visible reflectance R_VIS, CIE color coordinates, and the solar transmission T_sol. Values of up to 2.4 have been attained for the energy efficiency of the colored reflection M=R_VIS/(100%-T_sol). The produced coatings combine a bright colored reflection with an acceptable solar transmittance, and are thus well suited for the application in colored glazed thermal solar collectors. This novel type of colored glazing opens up new perspectives for the architectural integration of thermal solar collectors, e.g. as solar active glass facades.     

浅淡高频铝基板孔金属化加工工艺

孔金属化高频铝基板是一种特种印制板，其具有高频印制板频带宽、信息量大，传输速度快和铝基印制板强度高、散热性好等优点，近年在混合集成电器、大功率电气设备、电源设备等领域得到了广泛应用，本文就孔金属化高频铝基板的生产加工进行交流。     

Ordering of Polystyrene Nanoparticles on Substrates Pre-Coated with Different Polyelectrolyte Architectures

Adjusting the inter-particle distances in ordered nanoparticle arrays can create new nano-devices and is of increasing importance to a number of applications such as nanoelectronics and optical devices. The assembly of negatively charged polystyrene (PS) nanoparticles (NPs) on Poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) brushes, quaternized PDMAEMA brushes and Si/PEI/(PSS/PAH)₂, was studied using dip- and spin-coating techniques. By dip-coating, two dimensional (2-D), randomly distributed non-close packed particle arrays were assembled on Si/PEI/(PSS/PAH)₂ and PDMAEMA brushes. The inter-particle repulsion leads to lateral mobility of the particles on these surfaces. The 200 nm diameter PS NPs tended to an inter-particle distance of 350 to 400 nm (center to center). On quaternized PDMAEMA brushes, the strong attractive interaction between the NPs and the brush dominated, leading to clustering of the particles on the brush surface. Particle deposition using spin-coating at low spin rates resulted in hexagonal close-packed multilayer structures on Si/PEI/(PSS/PAH)₂. Close-packed assemblies with more pronounced defects are also observed on PDMAEMA brushes and QPDMAEMA brushes. In contrast, randomly distributed monolayer NP arrays were achieved at higher spin rates on all polyelectrolyte architectures. The area fraction of the particles decreased with increasing spin rate.