Papers by Keyword: Screen Printing

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Authors: Libu Manjakkal, Katarina Cvejin, Jan Kulawik, Krzysztof Zaraska, Dorota Szwagierczak
Abstract: Fresh water deficiency caused by climate change calls for employing novel measures to ensure safety of drinking water supply. Wireless sensor networks can be used for monitoring hydrological conditions across wide area, allowing flow forecasting and early detection of pollutants. While there are no fundamental technological obstacles to implementation of large area sensor networks, their feasibility is constrained by unit cost of sensing nodes. This paper describes a low-cost pH sensor, intended for use in fresh water monitoring. The sensor was fabricated in a standard thick film process, and an off-the-shelf resistive paste was used as a sensing material. For the fabrication of sensor, RuO2 resistive paste was screen printed on the alumina substrate with silver conducting layer. Test solutions with pH ranging from 2 to 10 were prepared from HCl or KOH solutions. The potential difference between reference and sensing electrode (electromotive force emf of an electrochemical cell) should be proportional to the pH of a solution according to the Nernst equation. The fabricated sensor exhibits Nernstian response to pH. Influence of storage conditions on sensing performance was also investigated.
Authors: Xin Lin Zhang, Jun Yan Zhao, Shi Yong Luo, Wen Cai Xu
Abstract: Vacuum glazing is a new building material with excellent energy conservation and sound insulation properties. Usually, the edge sealing layer between two sheets of glass substrates are prepared by spraying the seal glass paste and then sintering. In the present research, a more effective preparation method is reported. The edge sealing layer is prepared with a glass paste by screen printing, and then sintering. The glass paste for the preparation of edge sealing layer of vacuum glazing was prepared by using low melting glass powder, ZrW2O8 powder with negative coefficient of thermal expansion and ethyl cellulose terpineol solution. The test result of the shear strength of the sealing layer indicated that the sealing is reliable.
Authors: Chuan Xiang Zhang, Xiao Dong Li, Dong Bai Zhao
Abstract: The application status and existing problems of liquid wallpaper paint screen printing in wall decoration were analyzed, and through the analysis original production, screen plate-making, the effects of printing process on the quality of liquid wallpaper paint printing on the wall were discussed. Experiments find that when screen mesh was in the range of 150 to 300 mesh per inch, scumming can be effectively avoided, the thickness of the film can be guaranteed, and can making printing stereoscopic; Limiting the exposure time from 45 to 65 seconds can get high quality screen plate. To take manual scraping with the blade angle of about 45 degrees, can guarantee the best printing quality and film thickness etc.
Authors: De Yu Chen, Yue Qin Hang, Xiao Cheng Su, Xue Fang Zhu
Abstract: The digital image processing and recognition technology is applied to the detection of the print quality of screen printing, which is designed to implement the application system of some functions in screen printing, such as the acquisition of multiple printing images, the feature extraction and the matching to the quality control processing. In the RG Chromaticity space, the template matching method is used to design the relevant algorithms and realize fast real-time detection of some problems related to the image dislocation, leakage India, infiltration excess and uneven quality color. Having been tested and run, the method appears good quality monitoring results and economic benefits.
Authors: Hyuck Jung, Duck-Jin Lee, Hyun-Tae Chun, Nam-Je Koh, Young Rae Cho, Dong-Gu Lee
Abstract: In this study, a 10"-sized panel with novel tetrode structure was tried to prevent broadening of electrons emitted from CNTs. The structure of the novel tetrode is composed of CNT emitters on a cathode electrode, a gate electrode, an extracting electrode coated on the top of a hopping electron spacer (HES), and an anode. HES contains funnel-shaped holes whose inner surfaces are coated with MgO. Electrons extracted through the gate are collected inside the funnel-shaped holes and hop along the hole surface to the top extracting electrode. The effects of HES on emission characteristics of field emission display (FED) were investigated. An active ozone treatment for the complete removal of residues of organic binders in the emitter devices was applied to the FED panel as a post-treatment
Authors: Sung J. Lee, Sei Young Moon, Se. W. Jung, Seung Soo Han, Sang Jeen Hong
Abstract: To alleviate concerns of manufacturing cost and efficiency of solar cell fabrication, a belt type-high temperature furnace with three temperature zones is employed in order to increase the solar cell manufacturing throughput. In addition, characterization of the firing process for the contact formation is investigated to achieve the most efficient solar cell device fabricated. Statistical design of experiment (DOE) is used in order to perform a set of firing experiments in a systematic way. Response surface models for the efficiency are established for the characterization of multivariate problem. Furthermore, the optimized process recipe that can provide 15.9% of efficiency is proposed through the process optimization.
Authors: Priyanka Singh, Shailesh N. Sharma, G. Bhagavannarayana, M. Husain, M. Lal
Abstract: Porous silicon (PS) layers were formed by anodization on polished substrates of (1 0 0) Si at different current densities for a fixed anodization time of 30 mins. using different screenprinted/ evaporated back contacts (Ag, Al) respectively. The PS films has been characterized by high resolution X-ray diffraction (HRXRD), photoluminescence (PL), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared (FTIR) techniques respectively. Porosity and thickness of PS layers were estimated by gravimetric analysis. The properties of PS formed using screen-printed Ag & Al as the back contacts (SP-(Ag/Al)) was found to be superior as compared to the corresponding films with evaporated back contacts (EV-(Ag/Al)). The PS formed with screenprinted Ag & Al-back contacts shows better crystalline perfection, higher stability, higher PL efficiency and negligible PL decay compared to that formed with evaporated Ag & Al- as the back contact for the same current density and time of anodization.
Authors: Tatsunori Kakuda, Takashi Terasawa, Tomoaki Futakuchi
Abstract: In this study, we attempted to develop a low-cost dye-sensitized solar cell (DSC) by substituting a screen-printed carbon electrode for the conventional platinum counter electrode. Carbon electrodes were formed from mixtures of activated carbon, carbon nanofiber, carbon black, and a resin. The best carbon electrode conversion efficiency obtained was approximately 90% that of a platinum-based electrode.
Authors: Krzysztof Grabowski, Paulina Zbyrad, Tadeusz Uhl
Abstract: In this paper there wasdevelopeda CNT based sensor applied to the tested material and integrated with it. MWCNTs weremixed with polymer and then applied to the materials (fiber glass composites) with the use of screen printing. The surface and the inner part of the sensing material were investigated using SEM. The most importantand noticeable thing was dispersion of CNTs in epoxy.Moreover, the sensors were tested under the different loads. There were three runs for the same compositions of CNT/epoxy. Results from the test runs were compared to the images from SEM and discussed. Screen printing technique has shown promising results for the application and integration of the sensors on the base materials leading to the conclusion to do more research for the screen printing technique for application of CNT/epoxy sensors for large area appliaction and variant environments.
Authors: Sung Gap Lee, Young Jae Shim, Cheol Jin Kim, Won Tae Bae, Kyu Hong Hwang, Young Hie Lee, Jun Ki Chung
Abstract: Ferroelectric PZT heterolayered thick films were fabricated by the alkoxide-based sol-gel method. PZT(20/80) and PZT(80/20) paste were made and alternately screen-printed on the alumina substrates. The coating and drying procedure was repeated 4 times to form the heterolayered thick films. The thickness of the PZT heterolayered thick films was approximately 60 μm. All PZT thick films showed the typical XRD patterns of a perovskite polycrystalline structure. The relative dielectric constant and the dielectric loss of the PZT thick films sintered at 1050oC were 283 and 1.90%, respectively.
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