Nanotechnology has made great strides in recent years, bridging the gap between science fiction and reality. In the process, the field has opened the door to exciting new possibilities, including nanobots, which could potentially aid scientists in drug delivery, pathogen elimination or microscopic self assembly.
Find a reputed academic research laboratory. Nanobots cannot be observed, much less created, in the absence of a cleanroom and sophisticated deposition machinery. If you are not a professor, contact those people engaged in research in the specific areas you're interested in studying. You may be able to work as a research assistant and use the research facilities .
Learn about molecular and atomic self-assembly. True nanobots do not rely on electronics, which are not at the nanometer length scale. Instead, they rely on the natural chemical bonds between atoms and can only be made in highly specific configurations.
Think of applications. What will your nanobot do? After considering the potential application, research all related structures and surfaces to learn compatibilities, conflicts, bonding characteristics, material properties and material responses to various stimuli such as light and electromagnetic waves. The goal should be to exploit these properties with suitable self-assembling structures. For example, if you were building a nanobot that needs to attach to cells to kill them, the first step would be to ask what chemicals the cell is susceptible to. The nanobot would likely feature this chemical as a significant part of its makeup.
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One of the most difficult tasks at the nanoscale is locomotion. Your nanobot needs some way to get around with limited energy. The driving force could be a chemical gradient, random motion or electronic power. Consider the various methods and decide which one is best suited to the energy requirements and applications of your nanobot.