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A shape-controlled method to functionalize multiwalled carbon nanotubes with Ni3S2.

Ji Min Du1, Dae Joon Kang

  • 1BK 21 Physics Research Division, Institute of Basic Science, SKKU Advanced Institute of Nanotechnology and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, Republic of Korea.

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|November 2, 2007
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Summary

This study details the synthesis of nickel sulfide (Ni3S2) coated multiwalled carbon nanotubes (MWCNTs) using a solvent-thermal method. Controlling ammonia presence and precursor concentration allows tunable Ni3S2 morphologies, from uniform films to clustered nanoparticles.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Multiwalled carbon nanotubes (MWCNTs) are versatile nanomaterials with applications in various fields.
  • Functionalization of MWCNTs with metal sulfides can enhance their properties for specific applications.
  • Controlling the morphology of the coating material is crucial for optimizing nanocomposite performance.

Purpose of the Study:

  • To functionalize MWCNTs with Ni3S2 using a solvent-thermal approach.
  • To investigate the effect of ammonia and precursor concentration on the morphology of Ni3S2.
  • To elucidate the formation mechanism of different Ni3S2 morphologies on MWCNTs.

Main Methods:

  • Solvent-thermal synthesis of MWCNT/Ni3S2 nanocomposites.
  • Characterization using scanning transmission electron microscopy (STEM) and transmission electron microscopy (TEM).
  • Systematic variation of reaction parameters, including ammonia concentration and precursor levels.

Main Results:

  • Uniform Ni3S2 film coating on MWCNTs, resembling centipede-shaped structures, was achieved without ammonia.
  • Ni3S2 layer thickness was controllable by adjusting precursor concentration.
  • Addition of ammonia led to the formation of clustered Ni3S2 nanoparticles on MWCNT surfaces.
  • Nanoparticle size was tunable by varying the amount of ammonia.

Conclusions:

  • The solvent-thermal method enables controlled synthesis of MWCNT/Ni3S2 nanocomposites with distinct morphologies.
  • Ammonia plays a critical role in directing the formation of Ni3S2 from films to clustered nanoparticles.
  • A dynamic-controlled Oswald ripening mechanism is proposed to explain the observed morphological variations.