Infrared absorption properties of carbon nanotubes synthesized by chemical vapor deposition

Abstract

We present an infrared (IR) optical absorbance study of highly uniform nanotubes grown by chemical vapor deposition in the self-assembled porous matrix in alumina. For unambiguous IR spectral measurement, nanotubes were extracted from their growth template, purified, and evenly dispersed on a reflecting substrate. The findings, which are consistent with previous results from conduction studies, reveal that the nanotubes are semiconducting with a band gap of ∼100meV. This suggests the potential of nanotube arrays for IR electro-optical device applications.

Infrared Lasers in Nanoscale Science

“…This is an IR-active, graphite-like E 1u mode (also known as the G band) originating from the sp 2 -hybridized carbon. The absorbance peak at 1200 cm −1 , is a disorder-induced one phonon absorbance band (D band-from the sp 3 -hybridized carbon), which has been also observed in neutron irradiated diamonds [24] . This lattice mode arises from the disruption of the translational symmetry of the diamond lattice.…”

“…A typical mid-IR to near-IR absorbance spectrum taken on uniformly dispersed, purified CNTs (grown by CVD-mostly MWNT) at room temperature is displayed in Figure 9 [24] . In the measured IR absorbance spectrum, a prime intensity peak is seen at 1584 cm −1 .…”

Characterization of Carbon Nanotubes Loaded with Nitrogen, Phosphorus and Potassium Fertilizers

“…In the measured IR absorbance spectrum, a prime intensity peak is seen at 1584 cm −1 . This is an IR-active, graphite originating from the sp 2 hybridized carbon [24]. Peaks at 2915 and 2854 cm -1 are caused by C-H vibrations of alkyl group which are a residue of hydrocarbon molecules used for growing the CNTs.…”

Clinical Relevance of Nanoparticle Induced Hyperthermia for Drug Delivery and Treatment of Abdominal Cancers

“…Small-scale dimension affords the carbon nanotubes with special properties; Carbon Nanotubes not only have high electrical conductivity but they also high thermal conductivity, heat capacity, excellent mechanical strength along the tube axis, and are resilient to mechanical distortion [51,[56][57][58][59][60]. The generation of hyperthermia using nanotubes can depend upon how the nanotubes are processed as defects and the length of the tubes can influence their interactions with incident radiation [61]. Cleaning by oxidative treatments can remove the caps at the ends of the tubes so they could be filled with agents, but this process also shortens the tubes depending upon the time and strength of the oxidative treatment [62][63][64][65][66].…”

“…(7) [61,[70][71][72][73]. Nanotubes generate heat by absorbing incident light which induces phonon and plasmon resonances along the tube length [74][75][76].…”