Synthesis and structure of BN‐doped multi‐walled and single‐walled carbon nanotubes

Abstract

We report on the direct synthesis of different kinds of BN -C multi-walled and single-walled nanotubes exhibiting a segregation between BN and C domains. Multi-walled BN-C nanotubes (MW-BN/C-NTs) were synthesized using the aerosol method whereas single-walled BN-C nanotubes (SW-BN/C-NTs) have been for the first time produced using a continuous CO 2 -laser vaporization process [S. Enouz et al., to be published]. Degrees of purity, homogeneity and yield have been estimated from a systematic inspection of the samples by scanning electron microscopy. Structure of these tubes and spatial distribution of C, B and N as well as their chemical environments have been inspected at the nanometer scale by combining high resolution transmission microscopy and nano-electron energy loss spectroscopy. These analyses provide clear evidence of new kinds of arrangements of C, B and N within the graphene layer, which are due to the segregation properties of h-BN and graphite. Thus, combining BN and C elements into nanotubular systems can open the way to a broad range of new nanodevices.

Bor – elementare Herausforderung für Experimentatoren und Theoretiker

“…[32] Zu deren detaillierter Analyse mittels hochauflösender Transmissionselektronenmikroskopie (TEM) und Elektronenenergieverlustspektroskopie (EELS), durch die auch die optische Bandlücke ermittelt wurde, erschienen in der Folge richtungsweisende Arbeiten. [33][34][35][36] Bornitrid-Nanoröhren wurden auch als Komposit mit Kohlenstoff, [37] Borcarbid-Nanofasern sogar geordnet mittels chemischen Prozessen aus Vorstufenverbindungen abgeschieden. [38] Dieser chemische Prozess zu nanostrukturierten Materialien, Nanopartikeln und Nanofasern und -röhren ist sehr vielversprechend; BN (in Form Diatomeenähnlicher Partikel) und B 13 C 2 wurde so z.…”

Hydrogen storage properties of B‐ and N‐doped microporous carbon

“…In recent years, various carbon materials such as activated carbon (AC), carbon nanotubes (CNTs), microporous carbon and mesoporous carbon have been studied extensively for a variety of applications 1–12. Among these studies, there has been growing interest in synthesis of B‐ and/or N‐doped carbon materials due to their unique electronic, mechanical, optical and adsorption properties compared with pure carbon materials 13–38. B‐ and N‐doped carbon nanotubes (BCN nanotubes), including single‐walled carbon nanotubes (SWNTs), double‐walled carbon nanotubes (DWNTs) and multi‐walled carbon nanotubes (MWNTs) have been synthesized by various methods including arc‐discharge,25, 26 laser ablation,27, 28 substitution reaction,29–31 and chemical vapor deposition (CVD) 32–35.…”

Field emission from single‐wall nanotubes obtained from carbon and boron nitride mixtures

“…The first successful synthesis of heterophase BN:C SWNTs has been performed by laser ablation [2]. The heterophase structure has been confirmed by high resolution transmission electron microscopy (HRTEM) and electron energy-loss spectroscopy (EELS).…”