Advances in nano research

  • 제1권2호
  • /
  • Pages.71-82
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  • 2013
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  • 2287-237X(pISSN)
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  • 2287-2388(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

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A facile chemical synthesis of a novel photo catalyst: SWCNT/titania nanocomposite

  • Paul, Rima (Acharya Prafulla Chandra College) ;
  • Kumbhakar, Pathik (Nanoscience Laboratory, Department of Physics, National Institute of Technology Durgapur) ;
  • Mitra, Apurba K. (National Institute of Technology)
  • 투고 : 2013.01.15
  • 심사 : 2013.06.01
  • 발행 : 2013.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

A simple chemical precipitation technique is reported for the synthesis of a hybrid nanostructure of single-wall carbon nanotubes (SWCNT) and titania ($TiO_2$) nanocrystals of average size 5 nm, which may be useful as a prominent photocatalytic material with improved functionality. The synthesized hybrid structure has been characterized by transmission electron microscopy (HRTEM), energy-dispersive X-ray analysis (EDAX), powder X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. It is clearly revealed that nearly monodispersed titania nanocrystals (anatase phase) of average size 5 nm decorate the surfaces of SWCNT bundles. The UV-vis absorption study shows a blue shift of 16 nm in the absorbance peak position of the composite material compared to the unmodified SWCNTs. The photoluminescence study shows a violet-blue emission in the range of 325-500 nm with a peak emission at 400 nm. The low temperature electrical transport property of the synthesized nanomaterial has been studied between 77-300 K. The DC conductivity shows semiconductor-like characteristics with conductivity increasing sharply with temperature in the range of 175-300 K. Such nanocomposites may find wide applications as improved photocatalyst due to transfer of photo-ejected electrons from $TiO_2$ to SWCNT, thus reducing recombination, with the SWCNT scaffold providing a firm and better positioning of the catalytic material.

키워드

참고문헌

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