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Synthesis and study of carbon/TiO2 and carbon/TiO2 core–shell micro-/nanospheres with increased density

Published online by Cambridge University Press:  29 October 2012

Cynthia Papo ,
Zikhona Tetana ,
Paul Franklyn  and
Sabelo Mhlanga
Cynthia Papo
Affiliation:
Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Wits, 2050, Johannesburg, South Africa
Zikhona Tetana
Affiliation:
Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Wits, 2050, Johannesburg, South Africa; and DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Johannesburg, South Africa
Paul Franklyn
Affiliation:
Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Wits, 2050, Johannesburg, South Africa
Sabelo Mhlanga*
Affiliation:
Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Wits, 2050, Johannesburg, South Africa; and DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Johannesburg, South Africa
*
a)Address all correspondence to this author. e-mail: Sabelo.Mhlanga@wits.ac.za
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Abstract

Nanosized graphitic carbon provides high selectivity and stability of catalysts. However, the carbon is very light when used as a support, even when loaded with metals. To counteract this problem, carbon/TiO2 core–shell structures were synthesized via chemical vapor deposition (CVD) using a single source precursor to increase its density, while maintaining a high surface area and stability of the materials. The diameter of the carbon/TiO2 spheres could be controlled from 2 μm to 200 nm by varying the flow rate of nitrogen. TEM analysis revealed that a fraction of the spheres exhibited a core–shell structure, with a faint carbon shell surrounding the TiO2 sphere. The density of the carbon/TiO2structures was 0.70 g/mL, which is four times higher than that of pure carbon nanotubes and spheres synthesized by CVD.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 3: Focus Issue: Titanium Dioxide Nanomaterials , 14 February 2013 , pp. 440 - 448
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

Leary, R. and Westwood, A.: Carbonaceous nanomaterials for the enhancement of TiO2 photocatalysis. Carbon 49, 741 (2011).Google Scholar
Dong, F., Guo, S., Wang, H., Li, X., and Wu, Z.: Enhancement of the visible light photocatalytic activity of C-doped TiO2 nanomaterials prepared by a green synthetic approach. J. Phys. Chem. C 115, 13285 (2011).Google Scholar
Kim, M.Y., Kim, K.D., and Luo, Y.: Improvement in the photocatalytic activity of TiO2 by the partial oxidation of the C impurities. Appl. Surf. Sci. 257, 2489 (2011).Google Scholar
Choy, K.L.: Chemical vapor deposition of coating. Prog. Mater. Sci. 48, 57 (2003).Google Scholar
Graham, U.M., Dozier, A., Khatri, R.A., Bahome, M.C., Jewel, L.L., Mhlanga, S.D., Coville, N.J., and Davies, B.H.: Carbon nanotube docking stations: A new concept in catalysis. Catal. Lett. 129, 39 (2009).CrossRefGoogle Scholar
Mhlanga, S.D., Mondal, K.C., Carter, R., Witcomb, M.J., and Coville, N.J.: The effect of synthesis parameters on the catalytic synthesis of multiwalled carbon nanotubes using Fe-Co/CaCO3 catalysts. S. Afr. J. Chem. 62, 67 (2009).Google Scholar
Linselbigler, A.L., Lu, G., and Yates, J.T.: Photocatalysis of TiO2 surfaces: Principles, mechanisms, and selected results. Chem. Rev. 95, 735 (1995).Google Scholar
Fu, P., Luan, Y., and Dai, X.: Preparation of activated carbon fibers supported TiO2 photocatalyst and evaluation of its photocatalytic reactivity. J. Mol. Catal. A: Chem. 221, 81 (2004).CrossRefGoogle Scholar
Bahome, M.C., Jewell, L.L., Hildebrandt, D., Glasser, D., and Coville, N.J.: Fischer-Tropsch synthesis over iron catalysts supported on carbon nanotubes. Appl. Catal., A 287, 60 (2005).Google Scholar
Zaman, M., Khodadi, A., and Mortazavi, Y.: Fischer–Tropsch synthesis over cobalt dispersed on carbon nanotubes-based supports and activated carbon. Fuel Process. Technol. 90, 1214 (2009).Google Scholar
Di Valentin, C., Pacchioni, G., and Selloni, A.: Theory of carbon doping of titanium dioxide. Chem. Mater. 17, 6656 (2005).Google Scholar
Park, Y., Kim, W., Park, H., and Tachkaw, T.: Carbon-doped TiO2 photocatalyst synthesized without using an external carbon precursor and the visible light activity. Appl. Catal., B 91, 355 (2009).CrossRefGoogle Scholar
Gupta, S.M. and Tripathi, M.: A review of TiO2 nanoparticles. Chin. Sci. Bull. 56, 1639 (2011).CrossRefGoogle Scholar
Inagaki, M., Kojin, F., Tryba, B., and Toyaba, M.: Carbon-coated anatase: The role of the carbon layer for photocatalytic performance. Carbon 43, 1652 (2005).Google Scholar
Jung, S.C.: Photocatalytic activities and specific surface area of TiO2 films prepared by CVD and sol-gel method. Korean J. Chem. Eng. 25, 364 (2008).Google Scholar
Saito, T., Ando, Y., and Tobe, S.: Rapid synthesis of photo-catalytic titanium oxide film by atmospheric TPCVD. J. Environ. Eng. 2(2), 429 (2007).CrossRefGoogle Scholar
Harizanov, O.A., Gesheva, K.A., and Stefchev, P.L.: Sol-gel and CVD-metal oxide coatings for solar energy utilization. Ceram. Int. 22, 91 (1996).Google Scholar
Guosheng, W., Tomohiro, N., Bunsho, O., and Aicheng, C.: Carbon-doped TiO2 micro-/nanospheres and nanotubes have been synthesized via a single source precursor. Chem. Mater. 19, 4530 (2007).Google Scholar
Choi, H.C., Jung, Y.M., and Kim, S.B.: Size effects in the Raman spectra of TiO2 nanoparticles. Vib. Spectrosc. 37, 33 (2005).Google Scholar
Gao, K.: Strong anharmonicity and phonon confinement on the lowest-frequency Raman mode of nanocrystalline anatase TiO2. Phys. Status Solidi B 244(7), 2597 (2007).CrossRefGoogle Scholar