Extraction of Linear Carbon Chains Unravels the Role of the Carbon Nanotube Host
arXiv:1901.08305 · doi:10.1021/acsnano.8b04006
Abstract
Linear carbon chains (LCCs) have been shown to grow inside double-walled carbon nanotubes (DWCNTs) but isolating them from this hosting material represents one of the most challenging tasks towards applications. Herein we report the extraction and separation of LCCs inside single-wall carbon nanotubes (LCCs@SWCNTs) extracted from a double walled host LCCs@DWCNTs by applying a combined tip-ultrasonic and density gradient ultracentrifugation (DGU) process. High-resolution transmission electron microscopy (HRTEM), optical absorption, and Raman spectroscopy show that not only short LCCs but clearly long LCCs (LLCCs) can be extracted and separated from the host. Moreover, the LLCCs can even be condensed by DGU. The Raman spectral frequency of LCCs remains almost unchanged regardless of the presence of the outer tube of the DWCNTs. This suggests that the major importance of the outer tubes is making the whole synthesis viable. We have also been able to observe the interaction between the LCCs and the inner tubes of DWCNTs, playing a major role in modifying the optical properties of LCCs. Our extraction method suggests the possibility towards the complete isolation of LCCs from CNTs.
arXiv comment23 pages
References in corpus (8)
- Confined linear carbon chains: A route to bulk carbyne
- Carbyne from first principles: Chain of C atoms, a nanorod or a nanorope?
- Fine Structure of the Radial Breathing Mode in Double-Wall Carbon Nanotubes
- Electronic band gaps of confined linear carbon chains ranging from polyyne to carbyne
- Semiconductor-to-metal transition in carbon-atom wires driven by sp2 conjugated endgroups
- Ultra-Thin Double-Walled Carbon Nanotubes A Novel Nanocontainer for Preparing Atomic Wires
- Polyyne Electronic and Vibrational Properties under Environmental Interactions
- The Growth of New Extended Carbon Nanophases from Ferrocene Inside Single-Walled Carbon Nanotubes