[ Instrument Network Instrument Development ] Professor Huang Hui from Dalian University of Technology developed a “nanowire bridge growth technology†for leak-free current, which solved the problem of array assembly, electrode contact and material stability of nanowire devices, and prepared high reliability (8 GaN nanowire gas sensor with monthly resistance change rate <0.8%), low power consumption (room temperature operation) and high sensitivity (NO2 detection limit 0.5 ppb), the sensor can be extended to biological detection and stress strain detection, etc. Published in the international nano-domain top journal "Nano Letters".
At present, semiconductor integrated circuit chips (ICs) are developing rapidly, driving the rise of the Internet of Things and artificial intelligence industries. If the IC is likened to the human brain, the sensor is equivalent to the human sensory organ, and the two are interdependent. However, the degree of development of sensors (especially integrated micro-nano sensors) lags far behind the development of ICs. Therefore, micro-nano sensors (or sensor chips) will be another major industry after the IC industry.
Huang Hui team first studied the parasitic deposition effect in nanowire bridge growth, and invented a bridge growth method combining airflow blocking effect and surface passivation effect to solve the parasitic deposition problem; and realized "no leakage current" for the first time. Based on the GaN bridged nanowires, an integrated nanowire gas sensor with high stability, low power consumption and high sensitivity has been developed. In particular, GaN materials are third-generation semiconductors with excellent stability (high temperature resistance, oxidation resistance, acid and alkali corrosion resistance) and biocompatibility, suitable for stress and strain in harsh environments and detection of liquid and gas samples (experiment It proves that hydrofluoric acid corrosion has no effect on GaN nanowires for 48 hours, and it is widely used. This technology will drive the development of sensor chips.
(Original title: Dalian University of Technology prepares an integrated sensor with high reliability, low power consumption and high sensitivity)
Steel Plate
A Carbon Steel Plate has usually been considered as the steel that does not contain much alloy steel elements, also named as mild steel. Generally, elements are C, Mn, P, S, Si, besides these, there are no minimum limits for elements of Al, Cr, Ni, Mo, V, etc.
Carbon steel plates are available in different grades depending on the carbon content and strength.
As the content of Carbon increase, the steel plate hardness increases.
Low carbon steel plate: For carbon content 0.06% to 0.25%, also we call it Mild Steel Plate.
Medium carbon steel plate: C content from 0.25% to 0.55%.
High carbon steel plate: 0.55% to 1.0%, also called hard steel plate.
Low carbon steel is the most common form, and it's very malleable and ductile. Medium carbon steel balances ductility as well as strength for excellent wear resistance. High carbon steel is exceptionally strong, while ultra-high carbon steel can be tempered to even greater hardness but no malleability.
As the percentage of carbon gets larger, steel can become harder and stronger through heat-treating. Carbon steel is usually heated to change the mechanical properties of steel, usually ductility, hardness, strength, and resistance of impact. Increasing the carbon content of carbon steel makes it harder and stronger, but reduces the steel`s ability to be welded, making it more brittle.
Carbon steel plate is most often used for structural purposes such as buildings, yet it has the flexibility to be worked into ornate designs. Low carbon steel sheet (wrought iron) is typically used for fences, chain links, gates, and railings. Structural steel (medium carbon steel) is used in cars, refrigerators, washing machines, buildings, and bridges. The steel sheets are normally made up of medium carbon steel.