Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Simultaneous Control of Phase Transformation and Crystal of Amorphous TiO2 Coating on MWCNT Surface

  • Cha, Yoo Lim (Department of Chemical and Biological Engineering, Gachon University) ;
  • Park, Il Han (Future Industry R&D Center, DH Holdings Co., LTD) ;
  • Moon, Kyung Hwan (Future Industry R&D Center, DH Holdings Co., LTD) ;
  • Kim, Dong Hwan (Future Industry R&D Center, DH Holdings Co., LTD) ;
  • Jung, Seung Il (Future Industry R&D Center, DH Holdings Co., LTD) ;
  • Yoon, Young Soo (Department of Chemical and Biological Engineering, Gachon University)
  • Received : 2018.09.13
  • Accepted : 2018.11.03
  • Published : 2018.11.30
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Abstract

We developed a mass production method that simultaneously controls the phase transformation and crystal size of $TiO_2$ coatings on multiwalled carbon nanotubes (MWCNTs). Initially, MWCNTs were successfully coated with amorphous 15-20-nm-thick $TiO_2$ by an in-situ sol-gel method. As the calcination temperature increased in both air and argon atmospheres, the amorphous $TiO_2$ was gradually transformed into the fully anatase phase at approximately $600^{\circ}C$, a mixture of the anatase and rutile phases at approximately $700^{\circ}C$, and the fully rutile phase above approximately $800^{\circ}C$. The crystal size increased with increasing calcination temperature. Moreover, above $600^{\circ}C$, the size of crystals formed in air was approximately twice that of crystals formed in argon. The reason is thought to be that MWCNTs, which continuously supported the stresses associated with the reconstructive phase transformation, disappeared owing to complete oxidation in air at these high temperatures.

Keywords

References

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