The "blackest" material is made of high-precision laser power detector. The National Institute of Standards and Technology uses the world's blackest material-forest-like multi-wall carbon nanotubes as a coating to develop a laser power detector that can be used in optical communications , Laser manufacturing, solar energy conversion, and high-precision laser power measurement in advanced technical fields such as industrial and satellite carrier sensors. The research paper was published in the latest "Nano Express". This new type of detector hardly reflects visible light. In the deep purple wavelength range from 400 nm to the near infrared band of 4 microns, the reflection is less than 0.1%, and in the infrared spectrum of 4 microns to 14 microns, the reflection is less than 1%. This is similar to the ultra-black material reported by Rensselaer Polytechnic Institute in 2008. A Japanese team had a similar study in 2009. Inspired by the research paper "The World's Blackest Man-made Material" by Rensselaer Polytechnic Institute, the researchers of the National Institute of Standards and Technology arranged the fine carbon nanotubes sparsely and used it as a thermal detector. Coating, made a device for measuring laser power. Carbon nanotubes are good conductors of heat and provide an ideal coating for heat detectors. Although nickel-phosphorus alloys can reflect less light in certain wavebands, they cannot conduct heat. Cooperative researchers from New York ’s Stony Brook University have grown a coating of carbon nanotubes on a thermoelectric material, lithium tantalate. The coating absorbs the laser light and converts it into heat. The temperature rises to generate a current. The power of the laser can be determined by measuring the current size. . The darker the coating, the better the light absorption effect and the more accurate the measurement result. It is unique in that nanotubes are grown on thermoelectric materials, while in other studies they are grown on silicon materials. The National Institute of Standards and Technology has used a variety of materials for the detector coating, including flat single-wall nanotubes. The latest coating is a vertical forest-like multi-walled nanotube. Each thin tube has a diameter of less than 10 nanometers and a length of about 160 microns. The deep tube helps absorb random scattered light and reflected light in any direction. Due to the technical requirement that the reflection spectrum that the detector can measure is more extensive, the National Institute of Standards and Technology used five different methods to spend hundreds of hours to measure the weaker reflected light, and the accuracy of the results can meet the requirements. The researchers plan to extend the scale operating range of the device to 50 microns or even 100 microns wavelength, which may provide a standard for terahertz ray power measurement.
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