Measuring the Density of States of the Inner and Outer Wall of Double-Walled Carbon Nanotubes

Abstract

The combination of ultraviolet photoelectron spectroscopy and metastable helium induced electron spectroscopy is used to determine the density of states of the inner and outer coaxial carbon nanotubes. Ultraviolet photoelectron spectroscopy typically measures the density of states across the entire carbon nanotube, while metastable helium induced electron spectroscopy measures the density of states of the outermost layer alone. The use of double-walled carbon nanotubes in electronic devices allows for the outer wall to be functionalised whilst the inner wall remains defect free and the density of states is kept intact for electron transport. Separating the information of the inner and outer walls enables development of double-walled carbon nanotubes to be independent, such that the charge transport of the inner wall is maintained and confirmed whilst the outer wall is modified for functional purposes.

Single-Walled (Magnetic) Carbon Nanotubes in a Pectin Matrix in the Design of an Allantoin Delivery System

“…63−65 The peak at approximately 142 cm −1 is called the RBM mode and is the characteristic peak of the SWCNT structure. 66,67 Figure 3a−c depicts the TEM images of SWCNTs, mSWCNTs, and mSWCNTs coated with Gly (mSWCNT/ Gly), respectively. The formation of SWCNT is illustrated in Figure 3a, while Figure 3b,c shows iron oxide nanoparticles anchored onto the nanotube surface, distinguished by a darker color.…”

“…The group of peaks observed at approximately 213, 270, 387, 486, and 585 cm –1 belongs to the stretching vibrations of Fe and O in hematite (Fe 2 O 3 ). The presence of Fe 2 O 3 can be associated with the oxidation of magnetite to hematite owing to the high-power laser used during measurement. − The peak at approximately 142 cm –1 is called the RBM mode and is the characteristic peak of the SWCNT structure. , …”

“… 63 − 65 The peak at approximately 142 cm –1 is called the RBM mode and is the characteristic peak of the SWCNT structure. 66 , 67 …”

Non‐Covalent Functionalization of Magnetic Carbon Nanotubes with Fmoc Amino Acid‐Modified Polyethylene Glycol

“…The presence of Fe 2 O 3 can be associated with the oxidation of magnetite to hematite due to a high‐power laser during the measurement [38–40] . The peak at approximately 142 cm −1 is called RBM mode and the characteristic peak of SWCNT structure [41,42] …”

“…[38][39][40] The peak at approximately 142 cm À 1 is called RBM mode and the characteristic peak of SWCNT structure. [41,42] The formation of SWCNT synthesis is shown with Field Emission Gun Scanning Electron Microscopy (FEG-SEM), demonstrating the exact shape of mCNTs. From the FEG-SEM images in Figure 2, it is seen that for SWCNT the formation fluidizedbed chemical vapor deposition (CVD) method was successful.…”