<P><B>Abstract</B></P> <P>To improve the photocatalytic performance of anatase TiO<SUB>2</SUB> (a-TiO<SUB>2</SUB>), it is necessary to simultaneously increase its crystallinity and surface area. O...
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https://www.riss.kr/link?id=A107739610
2018
-
Sintering ; Nanocomposites ; Porosity ; TiO2
SCOPUS,SCIE
학술저널
1641-1645(5쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P><B>Abstract</B></P> <P>To improve the photocatalytic performance of anatase TiO<SUB>2</SUB> (a-TiO<SUB>2</SUB>), it is necessary to simultaneously increase its crystallinity and surface area. O...
<P><B>Abstract</B></P> <P>To improve the photocatalytic performance of anatase TiO<SUB>2</SUB> (a-TiO<SUB>2</SUB>), it is necessary to simultaneously increase its crystallinity and surface area. Our approach to achieve the desired morphology is to develop a porous single crystal that can be transformed from its mesocrystal form via annealing. We synthesized a-TiO<SUB>2</SUB> mesocrystals onto multiwalled CNTs using a facile one-pot chemical approach, and investigated the effect of the annealing temperature (200–600°C) on the crystallinity, morphology, chemical bonding state, and photocatalytic performance of the TiO<SUB>2</SUB>/CNT composites. The as-grown sample and sample annealed at 200°C consisted of spindle-like a-TiO<SUB>2</SUB> mesocrystals. As the annealing temperature increased to 400°C, the morphology of a-TiO<SUB>2</SUB> changed from mesocrystals into porous single crystals and the surface area enlarged due to the thermo-decomposition of organic residues between the subunits. The chemical bonding (Ti–O–C) between TiO<SUB>2</SUB> and CNT was also strengthened with increasing annealing temperature. On the other hand, the TiO<SUB>2</SUB> was separated from the CNT at 600°C because of the large difference in the thermal expansion coefficients. The photocatalytic performance of the TiO<SUB>2</SUB>/CNT composites was the highest at 400°C due to the increased crystallinity, removal of the by-products, and strengthened Ti–O–C bonds, resulting in an increase in the photocatalytic active sites and efficient charge separation.</P>