Multi-walled carbon nanotubes decorated with titanium nanoparticles: synthesis and characterization

A chemical route to decorate MWCNTs by titanium nanoparticles has been developed. MWCNTs, grown by catalytic decomposition of propane, have been used to prepare intercalated K-MWCNTs, which are then reacted with Ti(IV) isopropoxide. The amount of Ti present in the nanostructure is 8.7 wt%. Several techniques have been used for a detailed characterization of MWCNTs decorated by Ti nanoparticles, such as transmission electron microscopy (TEM), selected-area electron diffraction (SAED), high resolution transmission electron microscopy (HREM) and electron energy loss spectroscopy (EELS) as well as Raman spectroscopy and x-ray diffraction (XRD). Titanium is found to be present as α-Ti(hcp) dispersed in very small particles, the size of the largest being ∼2 nm. The Ti-containing phase appears to be fairly homogeneously distributed in the space between the two sides of a MWCNT. No intercalation of Ti between the CNT walls has been detected.

[1]  D. Gozzi,et al.  The thermodynamics of the transformation of graphite to multiwalled carbon nanotubes. , 2007, Journal of the American Chemical Society.

[2]  Y. Xing,et al.  Deposition of metallic nanoparticles on carbon nanotubes via a fast evaporation process , 2006, Nanotechnology.

[3]  A. Martin,et al.  Comparative study of first- and second-order Raman spectra of MWCNT at visible and infrared laser excitation , 2006 .

[4]  J. Verbeeck,et al.  Quantification of crystalline and amorphous content in porous TiO2 samples from electron energy loss spectroscopy , 2006 .

[5]  Hyunseok Kim,et al.  Hydrogen storage and desorption properties of Ni-dispersed carbon nanotubes , 2006 .

[6]  Shichun Mu,et al.  Hydrogen storage in carbon nanotubes modified by microwave plasma etching and Pd decoration , 2006 .

[7]  S. Ciraci,et al.  Titanium-decorated carbon nanotubes as a potential high-capacity hydrogen storage medium. , 2005, Physical review letters.

[8]  S. Ciraci,et al.  High-conducting magnetic nanowires obtained from uniform titanium-covered carbon nanotubes , 2004 .

[9]  Mildred Dresselhaus,et al.  Basic Research Needs for the Hydrogen Economy , 2004 .

[10]  M. Hirscher,et al.  Are carbon nanostructures an efficient hydrogen storage medium , 2003 .

[11]  L. Duclaux.  Review of the doping of carbon nanotubes (multiwalled and single-walled) , 2002 .

[12]  Jijun Zhao,et al.  Binding energies and electronic structures of adsorbed titanium chains on carbon nanotubes , 2002, cond-mat/0202150.

[13]  S. Ciraci,et al.  Tunable adsorption on carbon nanotubes. , 2001, Physical review letters.

[14]  X. Bai,et al.  Hydrogen storage in aligned carbon nanotubes , 2001 .

[15]  Hongjie Dai,et al.  Metal coating on suspended carbon nanotubes and its implication to metal–tube interaction , 2000 .

[16]  D. Bethune,et al.  Storage of hydrogen in single-walled carbon nanotubes , 1997, Nature.

[17]  S. Iijima.  Helical microtubules of graphitic carbon , 1991, Nature.

[18]  G. J. McCarthy,et al.  JCPDS-International Centre for Diffraction Data , 1981 .

[19]  Richard D. Leapman,et al.  Anomalous L_{3}/L_{2} White-Line Ratios in the 3d Transition Metals , 1980 .

[20]  G. Parry,et al.  Formation and structure of the potassium graphites , 1968 .

[21]  M. Izquierdo,et al.  Hydrogen adsorption studies on single wall carbon nanotubes , 2004 .

[22]  S. Han,et al.  ADSORPTION PROPERTIES OF HYDROGEN ON (10, 0) SINGLE-WALLED CARBON NANOTUBE THROUGH DENSITY FUNCTIONAL THEORY , 2004 .

[23]  D. Braga,et al.  Graphite lamellar compounds. Structure of transition-metal intercalates , 1979 .

[24]  L. Alexander,et al.  X-Ray diffraction procedures for polycrystalline and amorphous materials , 1974 .