American scientists for the first time to create a thickness of only three atoms of molybdenum disulfide semiconductor film, which not only slender, but also has excellent electrical properties, can be widely used to create a variety of ultra-thin electronic devices.
Lead researcher and Corvall University assistant professor of chemistry and chemical biology, Jiwooge Parker said: "The electrical properties of the newly obtained molybdenum disulfide semiconductor films are comparable to molybdenum disulfide single crystals, but what we did was not Thin crystals, but 4-inch wafers (crystals sliced ​​at a certain azimuth). "
Parker said that in previous large-scale studies, molybdenum disulphide could only be planted dispersedly, just like isolated islands at sea, but creating a smooth, flat, ultra-thin sheet like paper was the way to practical equipment applications The only way.
Researchers used MOCVD technology to make the required flakes, which are widely used in industry but using other materials. According to the DailySciences Network, Parker's team systematically optimized this technology to tailor the environment and temperature to create new films in their latest research. They found that with a bit of hydrogen and in a completely dry environment, the crystals grow perfectly together.
Researchers led by David Mueller, a professor of applied and engineering physics at Cornell University, co-author of the research paper, tested the quality and performance of the films as they grew with advanced transmission electron microscopy. The results show that the semiconductor film, which has a thickness of only three atoms, can be stacked with silicon dioxide layer by layer to create a multi-layered, ultrathin electronic device that has been published in the recently published journal Nature .
The researchers also slightly modified the MOCVD method to create tungsten disulfide films with different electrical properties and colors, and they hoped to further refine the method to create other films of only a few atoms in thickness and eventually create novelty Electronic equipment and optoelectronic equipment.
Due to the harsh working environment of the ship, the hull shell is subject to chemical corrosion of seawater, electrochemical corrosion and corrosion of marine organisms and microorganisms; the hull is subjected to large wind and wave impacts and alternating loads; the shape of the ship is complicated by processing methods, etc. Steel for hull structure is strictly required. First of all, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, weldability, forming properties and surface quality are required.
Shipbuilding Steels Our hot rolled shipbuilding steel is produced in accordance with the relevant Classification Society, examples of which include Lloyds Register and Det Norske Veritas.
Our steel products include steel shipbuilding plate, fabricated steel sections and floor plate for decking. We can also supply bulb flats for plate stiffening, structural steel angles and inverted angles.
Our plates are supplied under the ASTM/ASME specification (ASTM A131 / ASME SA 131) which is the standard specification for Structural Steel for Ships. We offer higher strength shipbuilding steels as standard .High strength steels offer significant cost advantages by reducing the weight of the structure in comparison to the steel used.
The plates are suitable for use in the construction of container ships and large cargo freighters as well as commercial shipping lines such as luxury cruise ships and ferries. Supply options include heavy plates, surface treated plates and pre-fabricated sections. In most cases, the steel can also be supplied as hot rolled coils or cut into lengths (sheets).
These high yield materials are commonly used in the construction of hulls and superstructures for large shipping vessels. The grades are exclusively for shipbuilding use as set out in the standard.
Marine Steel Plate,Ccs Marine Steel Plate,Ship Building Steel Plate,Ah36 Marine Steel Plate
Shandong Guanzhou Iron and Steel Group Co., Ltd , https://www.shansteelsupply.com