American scientists have designed a new nanowire welding technology that can use surface plasmon photonics to weld nanowires together with a simple beam of light. The latest research published in the recently published "Natural Materials" magazine is expected to lead to the emergence of new electronic devices and solar devices.
At present, some nanologists are focusing on manufacturing conductive grids composed of metal nanowires. Such grids have excellent power transmission performance, low cost and are very easy to handle. They can be widely used in next-generation touch screens, video displays, and light-emitting diodes. And thin film solar cells.
However, in the process of manufacturing such a mesh, heat or pressure must be applied to the delicate mesh to fuse together the nanowires placed in a cross shape that form the mesh, which in turn damages the mesh.
The latest nanowire welding technology solves the above problems. The core of the new technology is the physical properties of surface plasmon photonics-light flows through the metal surface in the form of waves and interacts with the metal. Surface plasmon photonics enables components and circuits based on surface plasmons to have a nanoscale, which can achieve a perfect marriage between photons and electronic components on the nanoscale. Scientists used an electron microscope to photograph the light before and after the light on the nanowires. The comparison of the pictures found that before the light, the single nanowires were layered together; after the light, the nanowires on the top were like antennas, guiding the light. Of plasmon waves enter the wires at the bottom and create heat to weld the nanowires together.
Mark Brungersam, a surface plasmon photonics expert at the School of Materials Science and Engineering at Stanford University, one of the authors of the study, said: "When two nanowires are laid together in a cross, where the nanowires meet, Light generates plasmon waves, creating a hot spot. However, hot spots only exist when the nanowires are in contact with each other. When the nanowires are fused together, the hot spots disappear. Welding prevents the hot spot itself, so the entire system Keep it intact and not be damaged. â€Michael McGill, another author of the study and the university ’s materials engineer, added,“ During this process, the rest of the wire and equally important basic materials will not be affected. This precision Heating greatly increases the control, speed and energy efficiency of our welding of nanomaterials. "
Scientists say that in addition to allowing them to make nanowire grids that are harder and more performant, the new method is also expected to allow them to make mesh electrodes attached to flexible or transparent plastics and polymers, which is possible. Let cheap window coatings that generate solar energy appear.
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