Anatase Titanium Dioxide Coated Single Wall Carbon Nanotubes Manufactured by Sonochemical-Hydrothermal Technique

Abstract

A novel, cost effective, sonochemical-hydrothermal technique was used for the deposition of nanosized anatase titanium dioxide (TiO 2 ) onto single wall carbon nanotubes (SWCNTs). This technique is described and the characterization of the synthesized TiO 2 -SWCNTs is reported. The characterization techniques employed include scanning electron microscopy (SEM), Raman spectroscopy, and X-ray diffraction (XRD). From the characterization the size and morphology of the synthesized TiO 2 nanoparticles (deposited on the SWCNTs) are reported. Furthermore, it is demonstrated that the created TiO 2 nanoparticles are chemically attached to the SWCNTs. Also, an important correlation between calculated TiO 2 crystal size and the red shifts in the lowest Raman TiO 2 (E. g. ) predominate peak is reported. The synthesized TiO 2 -SWCNTs have potential for large scale production and application in a variety of new technologies such as clean energy power generation devices, electrical storage devices, photocatalysts, and sensors.

High Conformity and Large Domain Monocrystalline Anatase on Multiwall Carbon Nanotube Core–Shell Nanostructure: Synthesis, Structure, and Interface

“…In particular, the E g(1) mode from the annealed sample has a narrower fwhm (14.6 cm –1 ) than the sample deposited directly at 220 °C (18.4 cm –1 ). The broadening or shift of the E g(1) mode in TiO 2 has been attributed to nonstoichiometry, impurities, strain gradients, and phonon confinement in TiO 2 nanoparticles due to the crystal size. − The deposition of TiO 2 at 220 °C involves the growth and coalescence of nanocrystals along the CNTs, resulting in grains of different sizes and perhaps induces stresses in the film, which explains the larger broadening of the fwhm at 220 °C. The peak position and fwhm of the E g(1) mode from the annealed sample are closer to the values of those of single crystal anatase (144 cm –1 , 7 cm –1 ).…”

Morphology and crystallinity control of ultrathin TiO2 layers deposited on carbon nanotubes by temperature-step atomic layer deposition

“…The Raman spectra show well-resolved anatase peaks for the samples with TiO 2 deposited at 220 °C and TS-ALD 60 °C-220 °C at: E g(1) 144 cm −1 , E g(2) 198 cm −1 , B 1g(1) 395 cm −1 , A 1g E 1g(2) 517 cm −1 , and E g(3) 636 cm −1 . 45,53,60 The deposition at 60 °C does not show any signal from anatase due to its amorphous nature. At 120 °C, there is a weak signal of anatase, mainly at E g (1) , which corresponds to the crystalline inclusions of <7 nm observed in TEM (Fig.…”

Preferential Adsorption of TiO2 Nanostructures on Functionalized Single-Walled Carbon Nanotubes: A DFT Study

“…In contrast, the metallic TiO 2 /CNT interface provides significant charge transfer, resulting in a small built-in potential. What can control this charge transfer is unknown, although nanocrystals of semiconducting particles interacting with SWCNTs can potentially improve the charge separation. , …”

“…a) and4(b) show two of the most stable titania surfaces, namely, the (100), (001) for rutile and the (010) and (100) for anatase [13][14]. To provide an accurate description of a site by site adsorption to SWCNTs, smaller models of titania were considered.…”