Papers by Author: Chao Wu

Abstract: Carbon nanotubes (CNTs) had good field emission ability and were adopted to form the cold cathode. The backlight field emission unit (BFEU) with CNTs as field emitter was designed and fabricated, and the detailed manufacture process was also given. The flat soda-lime glass was used as substrate plate. With the photolithography process, the indium tin oxide thin film covered on the cathode plate surface was divided into bar stripes to form the meshy bottom electrode for improving the field emission properties of CNT emitters. The sealed BFEU demonstrated better field emission performance, high luminance brightness. With the simple fabrication process, the total manufacture cost was also low.

Abstract: Using carbon nanotube (CNT) as cathode material, the field emission display (FED) panel with enhanced bar electrode was fabricated. With the photolithography process, the indium tin oxide (ITO) film was divided to form the cathode ITO electrode. The printed silver slurry was sintered to act as the cathode silver electrode, which was prepared on the cathode ITO electrode surface. The insulation layer was also fabricated on the cathode plate. The CNT paste was screen-printed on the surface of cathode ITO electrode and cathode silver electrode to form the field emitter. The detailed fabrication process of FED panel was given, and the sealed FED panel showed better field emission properties. Because of the enhanced bar electrode, the large field emission current was obtained.

Abstract: With high-effective screen-printing technique, the diode field emission display (FED) panel with carbon nanotube (CNT) as cathode material was fabricated. For improving the field emission properties, the annular field emitter was developed. The bar cathode indium tin oxide (ITO) electrode was formed by the divided ITO film with the photolithography process. After the sintering process, the printed silver slurry was solidified to form the rectangular ring electrode. The prepared CNT paste was printed to form the cold cathode emitter. Field emission characteristics of sealed FED panel were measured, and the emission image was also presented. A series of low-cost manufacture process was employed in the device fabrication course. The fabricated FED panel exhibited better field emission performance and large emission current.

Abstract: Using carbon nanotubes (CNTs) film as cathode material, the small-area flat lamp (FL) was sealed and fabricated. And the manufacture process for the whole FL was also presented in detail. The pyrolysis process was adopted to grow CNT film directly over the silicon substrate, and the chromium was deposited on the silicon substrate back surface to form the interface layer. After the sintering process for the screen-printed silver slurry, the patterned cathode electrodes were formed on the cathode back plane surface. Using silver slurry as adhesion material, the silicon substrate would be fixed on the cathode electrode. With the splicing method, the CNT film cathode could also be extended on the flat cathode back plane surface. The fabricated small-area FL using CNT film cathode exhibited better field emission property and high luminance brightness.

Abstract: Screen-printing process was adopted to prepare the carbon nanotube cathode. For improving the field emission performance of cold-cathode material, the optimized carbon nanotube cathode fabrication structure was given, and the detailed manufacture process was also described. The photoetched cathode indium-tin-oxide (ITO) stripes including the narrow bar ITO connecting line was fabricated to form the cathode electrodes. The annular silver conducting layer was adopted between the cathode ITO stripes and the carbon nanotube field emitters. The whole display device was packaged by means of glass frit, and vacuum-sealed through the exhaust tube. The fabricated field emission display could display some dot matrix number and characters, which possessed better field emission performance, higher display brightness and good field emission uniformity.

Abstract: Using carbon nanotube as field emitter, the diode-structure field emission display device was fabricated with conventional sintering techniques. With the precise photolithography process, the indium tin oxide film coated on the anode faceplate surface was etched to form the bar anode electrode. Using the screen-priinting technology, the insulation slurry was prepared on the bar anode electrode surface to form the anode separate layer. So the discrete anode sub-pixels layer structure was developed. For the vacuum-selaed FED device, the typical field emission characteristics were measured and the displayed dot matrix image was also presented. The fabricated FED device with discrete anode sub-pixel layer possessed higher dispaly image brightness, good image disnlay performance and better field emission characteristics.

Abstract: Silver slurry was used as conducting material, and the improved silver cathode electrode was fabricated. The CNT paste formed as field emitters was screen-printed on the surface of silver cathode electrode. The diode FED panel with CNT field emitters was sealed, and the fabrication of cathode substrate and anode substrate was described. The screen-printing technology and the sintering process were employed in the course of device fabrication for the silver cathode electrode. The field emission current was measured and the emission image was presented. The packaged FED showed good field emission characteristics and better field emission uniformity, which the manufacture process was also low-cost, feasible and simple.

Abstract: The main factors that affect properties of solid lubricant coating on high-speed steel surface are the surface roughness and the weight of phosphate coating. The effect of magnetic field on high speed steel phosphate process is significant. It promotes the film and the different appearance and composition of the film. Because the ferric phosphate and dihydric phosphate in phosphate solution may be ordered arrangement by additional magnetic field, they can be deposited on metal surfaces quickly. That is to say that a certain intensity of the magnetic field can reduce the entropy of the phosphate processing system and speed up the formation of phosphate film. During phosphate treatment, the friction performance of high-speed steel coated with solid lubricant coating was significantly improved.

Abstract: Cutting fluid occupies an important position in the metal processing. The performance and pollution problem brought to the environment of cutting fluid are paid attention to day by day. Proceed from the perspective of green design, using castor oil which has a good biodegradability, triethanolamine, boric acid and the sodium polyacrylate whose molecular weight is less than 2×104 as the main raw materials, a boron-containing water-based cutting fluid had been obtained. The performance of B-containing water-based cutting fluid are measured according to GB/T6144-1985 regulation which is the technical requirements of synthetic cutting fluid. And the biodegradability of mineral oil, castor oil, modified castor oil and B-containing water-based cutting fluid are measured by improved Storstroem Test (OECD301B). The test results show that the B-containing water-based cutting fluid has a good performance of physical and chemical. And the biodegradation rate of the cutting fluid is 87%, which indicates the cutting fluid has a good biodegradability.