Deoxyribonucleic acid (DNA)-based self-assembly has garnered considerable attention as a high-fidelity 'bottom-up' fabrication technique. Herein, intrigued by the amphiphilic nature of DNA molecules, we demonstrate a new class of DNA-directed amphiphilic self-assembly as a chemifunctional/multiscale-structuring strategy, beyond the previously reported DNA-mediated assemblies, and explore its potential application to lithium-sulfur (Li-S) batteries as a proof-of-concept. DNA-directed amphiphilic self-assembly enables the formation of various structures with a wide range of dimensional scales and exceptionally low bundle/junction electrical resistance, which are difficult to achieve with conventional DNA-mediated assemblies. The amphiphilic DNA molecules interact with single-walled carbon nanotubes (SWCNTs) through hydrophobic π-π stacking and divalent metal ions via electrostatic interaction. This results in electrically conductive DNA/SWCNT foams with hierarchical multiscale porous structures that can act as functional scaffolds of Li-S battery cathodes. Benefiting from the above-described advantageous effects, the DNA/SWCNT scaffold allows the resultant Li-S battery to provide significantly improved electrochemical performance.
Bibliographical noteFunding Information:
This study was supported by the Basic Science Research Program (2017M1A2A2087810, 2018R1A2A1A05019733, 2018M3D1A1058624 and 2017M1A2A2044501) and Wearable Platform Materials Technology Center (2016R1A5A1009926) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and future Planning.
© 2019 The Royal Society of Chemistry.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)