Structure and Properties of C₆₀@SWNT

Abstract

Our recent achievement of high-yield C 60 @SWNT synthesis facilitates characterization by various techniques, including selected area electron diffraction (SAD) and Raman spectroscopy. The obtained SAD patterns show that interior C 60 molecules sit on a simple 1-D lattice having a parameter of 1.00 nm. Simulated SAD patterns and real-space measurements both support this determination and do not indicate a lattice with a more complex basis, e.g. a dimer basis. Empty and bulk-filled SWNTs (22%, 56%, and 90% yields), each subjected to identical processing steps, were examined by room temperature Raman spectroscopy. Systematic differences are seen between the spectra of filled and unfilled SWNTs, particularly with respect to the G-and RBM-bands of the nanotubes. We present a possible explanation for this behavior. ABSTRACTOur recent achievement of high-yield C 60 @SWNT synthesis facilitates characterization by various techniques, including selected area electron diffraction (SAD) and Raman spectroscopy. The obtained SAD patterns show that interior C 60 molecules sit on a simple 1-D lattice having a parameter of 1.00 nm. Simulated SAD patterns and real-space measurements both support this determination and do not indicate a lattice with a more complex basis, e.g. a dimer basis. Empty and bulk-filled SWNTs (22%, 56%, and 90% yields), each subjected to identical processing steps, were examined by room temperature Raman spectroscopy. Systematic differences are seen between the spectra of filled and unfilled SWNTs, particularly with respect to the G-and RBM-bands of the nanotubes. We present a possible explanation for this behavior.

Role of the pressure transmitting medium on the pressure effects in DWCNTs

“…DWCNTs were prepared from highly filled C 60 ‐peapods: The SWCNTs [Carbon Solutions, Inc. (Type P2, average diameter 1.4 nm)] were filled with C 60 molecules using the gas phase method described in Ref. (). The caps of the SWCNTs were opened by heat treatment at C for 30 min.…”

Stabilization of carbon nanotubes by filling with inner tubes: An optical spectroscopy study on double-walled carbon nanotubes under hydrostatic pressure

“…Arc discharge SWCNTs (1.4 nm average diameter, Carbon Solutions Inc.) were filled with C 60 molecules using the sublimation method. 14 The prepared peapods were then transformed to DWCNTs by tempering the peapods at 1250…”

“…Arc discharge SWCNTs (1.4 nm average diameter, Carbon Solutions Inc.) were filled with C 60 molecules using the sublimation method. 14 The prepared peapods were then transformed to DWCNTs by tempering the peapods at 1250 • C for 24 hrs under dynamic vacuum and subsequently cooling the furnace to room temperature. Free-standing films from SWCNTs and DWCNTs for optical spectroscopy measurements were prepared from Triton X-100 suspension.…”