Catalytic synthesis of bamboo-like multiwall BN nanotubes via SHS-annealing process

Growth mechanism and ultraviolet-visible property of novel thick-walled boron nitride nanostructures

“…4g and h depicts the typical internal structure of BN nano-tadpoles consisting of a series of cone-shaped hollow structures, which was similar to that of bamboo-like BN nanotubes. 25,26,29 The formation mechanism of this kind of bamboo-like nanotube could be generally interpreted by the pressure-induced mutation growth model. 12,25,42 However, why does every nanotube synthesized in this paper presents an appearance of tadpole-like morphology with an equably tapered diameter from head to tail rather than a cylinder?…”

“…[24][25][26][27][28] The SHS process was adopted in order to obtain solid porous precursors with evenly distributed metal catalyst and boron source, which was favorable toward promoting large scale growth of high quality boron nitride nanotubes. 29 On the basis of this idea, we designed another way to produce an effective porous precursor and then synthesize numerous high quality thick-walled BN nano-tadpoles.…”

Electronic and Vibrational studies of Single Wall Carbon Nanotubes inside Boron nitride Nanotubes

“…One of the most powerful tools to investigate nanotructures vibrational, optical and electronic properties is Raman spectroscopy. Vibrational Raman spectroscopy has been shown to play a major role in CNTs [14,15,16,17] and in BNNTs [18,19,20].Raman spectra of CNTs and BNNTs show a strong line located in the 1570-1600 cm −1 range [21] and in the 1360-1380 cm −1 range [22,23,24,25,26]. Raman spectra of SCNTs and SBNNTs are dominated by the so called radial breathing mode (RBM) below 500cm −1 and by the tangential modes(TM) between 1200 and 1600cm −1 [27,28,29].The thermal treatment of fullerene inside BNNTs (C60@BNNT) at 1200…”

Raman-Active Modes in Finite and Infinite Double-Walled Boron Nitride Nanotubes

“…Raman spectra of MBNNTs show a strong line located in the 1356–1369 cm –1 range − that is sample-dependent and assigned to the E 2g in-plane phonon mode of bulk h -BN. Raman spectra of SBNNTs are dominated by the so-called radial breathing mode (RBM) below 500 cm –1 and by the tangential modes (TM) between 1200 and 1600 cm –1 .…”