Optically imaging of on-surface and suspended carbon nanotube devices.
Technion researchers have developed a method for growing carbon nanotubes that could lead to the day when molecular electronics replace silicon chip as the building block of electronics.Carbon nanotubes (CNTs) have long fascinated scientists because of their unprecedented electrical, optical, thermal and mechanical properties, and chemical sensitivity. But significant challenges remain before CNTs can be implemented on a wide scale, including the need to produce them in specific locations on a smooth substrate, in conditions that will lead to the formation of a circuit around them.
Prof. Yuval Yaish et al have developed a technology that addresses these challenges. Their breakthrough also makes it possible to study dynamic properties of CNTs, including acceleration, resonance, and transition from softness to hardness. The method could serve as an applicable platform for the integration of nano-electronics with silicon technologies, and possibly even the replacement of these technologies in molecular electronics.
“The CNT is an amazing and very strong building block with remarkable electrical, mechanical and optical properties,” said Prof. Yaish. “Some are conductors, and some are semiconductors, which is why they are considered a future replacement for silicon. But current methods for the production of CNTs are slow, costly, and imprecise. As such, they generally cannot be implemented in industry.”
Due to the nanometer size of CNTs it is extremely difficult to find or locate them at specific locations. They developed a simple, rapid, non-invasive and scalable technique that enables optical imaging of CNTs. Instead of depending no chemical properties to bind marker molecules, they relied on the fact that the CNT is both a chemical and physical defect on the otherwise flat and uniform surface. It can serve as a seed for the nucleation and growth of small, but optically visible nanocrystals, which can be seen and studied using a conventional optical microscope (CNTs, because of their small size, are too small to be seen in this way). Since the CNT surface is not used to bind the molecules, they can be removed completely after imaging, leaving the surface intact, and preserving CNT’s electrical and mechanical properties.
“We grow the CNTs directly, and with the aid of the organic crystals that coat them, we can see them under a microscope very quickly. Then image identification software finds and produces the device (transistor)…The goal is to integrate CNTs in an integrated circuit of miniaturized electronic components (mainly transistors) on a single chip (VLSI). These could one day serve as a replacement for silicon electronics.” http://www.newswise.com/articles/watch-out-silicon-chips-molecular-electronics-are-coming
http://www.nature.com/ncomms/2016/160711/ncomms12153/full/ncomms12153.html
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