US develops "nano heater" can reduce the cost of nano-machine manufacturing US scientists first clarified the role of temperature in dip pen nanolithography technology, based on the development of hot dip pen nanolithography technology can be constructed on the surface of the size of 20 Nanostructure. With this technology, scientists can inexpensively construct and plant nanostructures on the surface of a variety of materials to make circuits and chemical sensors, or to study how drugs attach to proteins and viruses. To construct nanostructures directly on a susceptor, scientists generally use an atomic force microscope (AFM) probe as a pen, which deposits ink molecules on the surface of the susceptor through molecular diffusion. This technology is expensive, requires a special environment and can only use a few materials. The dip pen nanolithography technology uses AFM probes to transfer ink molecules to the surface of the substrate to form a self-assembled monolayer. It has the advantages of high resolution, accurate positioning and direct writing, and is suitable for almost all environments. And many different compounds. The hot dip pen nanolithography technology can turn the atomic force microscope into a small "soldering iron", which can be applied to solid materials. Jim Djoel, interim director of the molecular factory at Lawrence Berkeley National Laboratory, and his colleagues systematically investigated the effect of temperature on the size of nanostructures and developed a new model to analyze how ink molecules reach the pedestal from the writing probe , And then combined into some ordered layers and become a nano-sized structure. Djoer said: "Probe-based manufacturing technology is expected to accurately produce nano-scale devices. However, we need to deeply understand how the ink molecules are transferred to the susceptor. The latest research makes this clear for the first time. "Zong Chengxu of the Division of Physical and Biological Sciences at Berkeley Laboratory said:" By carefully exploring the role of temperature in hot dip pen nanolithography, we can design and manufacture nanoscale structures from small molecules to polymers , And can better control its size and shape on various pedestals. "Djoel, Zong Chengxu and scientists at the University of Illinois at Urbana-Champaign (the premier in manufacturing special atomic force microscope probes), Pour differently charged atoms into the silicon, then more charged atoms will remain on the pedestal and less charged atoms will be located at the probe, which will heat the probe when current passes, just like on an electric furnace They burned the same way, so they developed this silicon-based atomic force microscope probe like a soldering iron. This "nano heater" can be used to heat the ink applied to it, causing the ink to flow to the surface, thereby creating a nano-sized structure. Using this method, the research team drew the dots and lines of the organic molecule 16-mercaptohexadecanoic acid on the gold surface. Moreover, the hotter the probe, the larger the structure that can be drawn. William King, a professor of mechanics and engineering at the University of Illinois who participated in the study, said: "The latest method allows us to clearly know how ink molecules flow onto the pedestal. Based on this, we can control the temperature well and thus control the pedestal The size and shape of the upper nanostructure. "
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