Construction of One-dimensional Organic Nanotubes: A Bottom-up Approach

Koner, Kalipada (2023) Construction of One-dimensional Organic Nanotubes: A Bottom-up Approach. PhD thesis, Indian Institute of Science Education and Research Kolkata.

Text (PhD thesis of Kalipada Koner (Registration Number (18RS010)) 18RS010.pdf - Submitted Version Restricted to Repository staff only Download (27MB)

Abstract

Nanotubes are one-dimensional nanomaterials with uniform and directional hollow channels with diameter in the nanometer regime. The comprehensive overview of this thesis is the effort to describe the necessity of stable and functional nanotubes, keeping the existing tubular materials in perspective and the design and synthetic strategies of such nanotubes. Soon after the discovery of the carbon nanotube (CNT) in 1991, nanotube-based science and technologies attained rapid growth. They are commonly synthesized by rolling up 2D graphene layers. Since harsh reaction conditions such as high temperatures are inevitable for CNTs formation, conventional bottom-up organic synthetic strategies have only limited CNT synthesis scope. Thus, both the synthesis and incorporation of desired functionalities in CNTs are still considered one of the most challenging tasks. In 2005, Omar M. Yaghi and co-workers came up with the idea of synthesizing purely covalently linked framework materials from small organic molecules via dynamic covalent chemistry. Since then, zero (0) [mimics fullerene], two (2) [mimics graphite], and three (3) [mimics diamond] dimensional covalent/organic materials have been explored extensively, starting from small organic building blocks. The one-dimensional nanotube, the only missing element in this series, has not been attained yet. The "discovery" of synthetic one-dimensional materials which would mimic the CNT is hitherto unheard of. We bridged the gap by synthesizing one-dimensional porous Covalent Organic Nanotubes. We showcase a unique approach to achieve a general design strategy to construct such one-dimensional porous nanotubes. The as-synthesized tubular materials show high thermal and chemical stability, whereas the synthetic strategy considers easiness and provides the opportunity for any desired functionalization.

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