Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 18, Pages 15711-15718Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b02607
Keywords
helical carbon nanotubes; polyaniline; hybridization; dual chirality; microwave absorption
Funding
- National Natural Science Foundation of China [51573149]
- Science and Technology Planning Project of Sichuan Province [2016RZ0050, 2016GZ0224]
- Shenzhen Key Laboratory of Ultrahigh Refractive Structural Material
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In this study, we designed a dual-chirality hierarchical structure to achieve a synergistically enhanced effect in microwave absorption via the hybridization of nanomaterials. Herein, polyaniline (PANi) nanorods with tunable chirality are grown on helical carbon nanotubes (HCNTs), a typical nanoscale chiral structure, through in situ polymerization. The experimental results show that the hierarchical hybrids (PANi@HCNTs) exhibit distinctly dual chirality and a significant enhancement in electromagnetic (EM) losses compared to those of either pure PANi or HCNTs. The maximum reflection loss of the as-prepared hybrids can reach -32.5 dB at 8.9 GHz. Further analysis demonstrates that combinations of chiral acid-doped PANi and coiled HCNTs with molecular and nanoscale chirality lead to synergistic effects resulting from the dual chirality. The so-called cross-polarization may result in additional interactions with induced EM waves in addition to multiscaled relaxations from functional groups and interfacial polarizations, which can benefit EM absorption.
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