Recently, the research group headed by Song Jinhui, a professor of Chinese at the University of Alabama, developed a new type of image sensor with a pixel size of only 50 nanometers, greatly breaking the current limit of 1,000 nanometers for digital image sensor pixels. The study was recently published in Advanced Materials, the top scientific journal for materials.
Since the invention of digital image sensors, researchers have tried every means to reduce the pixel size to improve the resolution of digital image sensors. Currently, the minimum pixel sizes for digital image sensors CCD and CMOS are 1.43 and 1.12 microns, respectively. Due to the physical properties of semiconductor thin film materials and the limitations of the traditional structure of digital image sensors, such pixel sizes are close to the physical limits. If you continue to reduce the size, the pixel will lose the light function.
Song Jinhui said that the current digital image sensor resolution breakthrough must be from the sensor material and structure of two aspects of radical innovation, and can not rely on the original device framework and material improvements.
To this end, the Song Jinhui scientific research team using three-dimensional semiconductor nanomaterials, completely different from the current digital image sensor device mechanism, the newly developed nano-semiconductor optoelectronic materials and three-dimensional device structure, to achieve the light intensity sensing and amplification dual functions to further reduce Pixel plane area, greatly reducing the sensor noise. According to the current popular full-size camera sensor size as a standard, the new sensor will have amazing 300 billion pixels, is now 10,000 times the sensor. Its super-high resolution will have a huge impact on a range of important technological fields such as image information storage, super-resolution microscopy, light-matter interaction and photonic computers.
Next, researchers will study full-color, high-response, ultra-high-precision digital image sensors based on this new sensor to advance its use in basic science and technology.
Oxide powder for thermal spray refers to a type of powder material that is used in thermal spray processes. Thermal spray is a coating technique where a material in powder form is heated and propelled onto a substrate, forming a coating.
Oxide powders are commonly used in thermal spray applications due to their high melting points, excellent wear resistance, and thermal insulation properties. They can be used to create protective coatings on various surfaces, such as metals, ceramics, and plastics.
Some common types of oxide powders used in thermal spray include:
1. Aluminum oxide (Al2O3): This oxide powder is widely used for its high hardness, wear resistance, and thermal insulation properties. It is commonly used for coating applications in industries such as aerospace, automotive, and electronics.
2. Zirconium oxide (ZrO2): Zirconium oxide powder is known for its high melting point and excellent thermal barrier properties. It is often used in thermal spray coatings for gas turbine engine components, where thermal insulation is critical.
3. Chromium oxide (Cr2O3): Chromium oxide powder is used for its high hardness, corrosion resistance, and wear resistance. It is commonly used in applications where high temperature and abrasive wear resistance are required.
4. Titanium oxide (TiO2): Titanium oxide powder is known for its high refractive index and excellent UV resistance. It is often used in thermal spray coatings for optical and decorative applications.
These oxide powders can be applied using various thermal spray techniques, such as flame spraying, plasma spraying, or high-velocity oxy-fuel (HVOF) spraying. The choice of oxide powder and thermal spray technique depends on the specific application requirements and desired coating properties.
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