Abstract
We found that oxidized Cu nanoparticles can catalyze the growth of boron nitride nanotubes from borazine via plasma-assisted chemical vapor deposition. The Raman spectra suggest that the formation of thin-walled nanotubes show a radial breathing mode vibration. The presence of oxygen in the plasma environment was necessary for the growth of the nanotubes, and a part of the nanotubes had a core shell structure with a cupper species inside it. In atomic resolution transmission electron microscope (TEM) images, Cu2O was found at the interface between the Cu-core and turbostratic BN-shell. The growth mechanism seemed different from that of carbon nanotube core-shell structures. Therefore, we pointed out the important role of the dynamic morphological change in the Cu2O-Cu system.
Highlights
IntroductionThe. Boron nitride nanotubes (BNNTs) have a large bandgap (5–6 eV) and exhibit good electrical insulation irrespective of their chirality [4]
Wevapor realized the for- (CVD) using we report theand plasma-assisted chemical deposition mation of a Cu-core and shell structure by adding oxygen gas to the plasma
BN was formed on the Cu nanoparticles, but no wire-like structures were formed
Summary
The. BNNTs have a large bandgap (5–6 eV) and exhibit good electrical insulation irrespective of their chirality [4]. BNNTs have a large bandgap (5–6 eV) and exhibit good electrical insulation irrespective of their chirality [4] They show a high thermal conductivity, high mechanical strength [5], and chemical stability [6]. BNNTs with a specific chirality exhibit a piezoelectricity [7]. It adsorbs hydrogen molecules [8]. It is expected that BNNTs have applications in various fields including thermal radiators, insulators, sensors, energy harvesting devices, hydrogen storage, and bio-related devices
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