Tuning the properties of CVD-grown multiwalled carbon nanotubes by ex situ codoping with boron and nitrogen heteroatoms

摘要: The electronic, optical and thermal properties of multiwalled carbon nanotubes (MWCNTs), synthesised using an atmospheric pressure chemical vapour deposition technique, were tuned by ex situ codoping with boron nitrogen (B/N) atoms at different temperatures (700–900 °C). High magnification TEM micrographs showed that the morphology as-grown B/N-MWCNTs was affected doping temperature. For instance, low (700–800 °C) led to growth exhibiting two-compartment morphology, comprising a bamboo-like tubular inner compartment coiled flower-like outer compartment. At 900 °C, alignment restructuring occurred resulted in thicker B/N-MWCNTs. XPS data analysis corroborated this finding indicating incorporation stable configurations, such as h-BN, BCN graphitic-N, into lattice increasing analyses good agreement data, depicting governed type amount bonding states within lattice. Finally, studies revealed more thermally owing B atoms. Thus, study illustrated adjusting temperature, properties, which are usually difficult adjust for MWCNTs, could be tuned.