Comparison of structural changes in nitrogen and boron-doped multi-walled carbon nanotubes

Effect of boron concentration on physicochemical properties of boron-doped carbon nanotubes

“…Thermal stability and purity of the samples were analysed using thermogravimetric analysis, a widely used method in literature for the analysis of CNTs [32,37,38], and the results are shown in Fig. 6A and B.…”

One-dimensional nitrogen-containing carbon nanostructures

“…Spatially resolved analyses have shown a clearly defined segregation of BN-regions from CN-rich regions, indicating that separate nanodomains of boron nitride and carbon nitride may exist with different arrangements in carbon nanotubes as a function of the synthesis method. MWBNCNTs were also produced using an aerosol CVD technique in conjunction with benzylamine, triethylborane, hexane and toluene mixtures[367]. These precursors were thermally decomposed between 800 and 1100 °C under argon at atmospheric pressure.…”

Covalently bonded three-dimensional carbon nanotube solids via boron induced nanojunctions

“…In addition, it was found that boron doping acts as a “surfactant” during growth to significantly increase the aspect ratio of nanotubes by preventing tube closure – allowing longer tube lengths to be synthesized (~ 5–100 µm) and favoring the zigzag (or near zigzag) chirality17. Boron-doped MWCNTs (CB X MWNTs) could be synthesized by chemical vapour deposition (CVD) using various hydrocarbons and boron sources18192021, but none of these works yielded 3D solid structures, or were able to confirm the distinct tubular morphologies induced by boron found in this article. Theoretical and experimental research had demonstrated that boron interstitial atoms located between double-walled CNTs act as atomic “fusers” or “welders” under high temperature annealing (1400 – 1600°C)22, thus establishing covalent tube interconnections, but neither did this work produce macroscale solids.…”