Koshi Kamiya1, Kazuto Kayama1, Masaki Nobuoka1, Shugo Sakaguchi1, Tsuneaki Sakurai2, Minori Kawata1, Yusuke Tsutsui1, Masayuki Suda1, Akira Idesaki3, Hiroshi Koshikawa3, Masaki Sugimoto3, G B V S Lakshmi4, D K Avasthi5, Shu Seki6. 1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan. 2. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan. sakurai-t@moleng.kyoto-u.ac.jp. 3. Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma, Japan. 4. Special Center for Nanoscience, Jawaharlal Nehru University, New Delhi, India. 5. Department of Physics, School of Engineering, University of Petroleum and Energy Studies, Dehradun, India. 6. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan. seki@moleng.kyoto-u.ac.jp.
Abstract
The critical dimension of semiconductor devices is approaching the single-nm regime, and a variety of practical devices of this scale are targeted for production. Planar structures of nano-devices are still the center of fabrication techniques, which limit further integration of devices into a chip. Extension into 3D space is a promising strategy for future; however, the surface interaction in 3D nanospace make it hard to integrate nanostructures with ultrahigh aspect ratios. Here we report a unique technique using high-energy charged particles to produce free-standing 1D organic nanostructures with high aspect ratios over 100 and controlled number density. Along the straight trajectory of particles penetrating the films of various sublimable organic molecules, 1D nanowires were formed with approximately 10~15 nm thickness and controlled length. An all-dry process was developed to isolate the nanowires, and planar or coaxial heterojunction structures were built into the nanowires. Electrical and structural functions of the developed standing nanowire arrays were investigated, demonstrating the potential of the present ultrathin organic nanowire systems.
The critical dimenpan class="Chemical">sion of semiconductor devices is approaching the pan class="Chemical">single-nm regime, and a variety of practical devices of this scale are targeted for production. Planar structures of nano-devices are still the center of fabrication techniques, which limit further integration of devices into a chip. Extension into 3D space is a promising strategy for future; however, the surface interaction in 3D nanospace make it hard to integrate nanostructures with ultrahigh aspect ratios. Here we report a unique technique using high-energy charged particles to produce free-standing 1D organic nanostructures with high aspect ratios over 100 and controlled number density. Along the straight trajectory of particles penetrating the films of various sublimable organic molecules, 1D nanowires were formed with approximately 10~15 nm thickness and controlled length. An all-dry process was developed to isolate the nanowires, and planar or coaxial heterojunction structures were built into the nanowires. Electrical and structural functions of the developed standing nanowire arrays were investigated, demonstrating the potential of the present ultrathin organic nanowire systems.
Authors: Michael J Mitchell; Margaret M Billingsley; Rebecca M Haley; Marissa E Wechsler; Nicholas A Peppas; Robert Langer Journal: Nat Rev Drug Discov Date: 2020-12-04 Impact factor: 84.694