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Jie, HyunSeock,Park, Hoon,Chae, Keun-Hwa,Anpo, Masakazu,Park, Jong-Ku Elsevier 2009 Chemical physics letters Vol.470 No.4
<P><B>Graphical abstract</B></P><P>The variation of relative peak area between t<SUB>2g</SUB> and e<SUB>g</SUB> at each irradiation condition.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>An in-situ NEXAFS study was performed to directly investigate the change in the hole structures in the conduction band of TiO<SUB>2</SUB> nanopowders synthesized using a flame method under UV irradiation. The anatase/rutile phase boundary was found to suppress the hole–electron recombination, leading to improved photoreactivity of TiO<SUB>2</SUB> nanopowders.</P>
A new absorption band and visible absorption properties in V‐doped TiO<sub>2</sub> nanopowder
Jie, HyunSeock,Park, Hoon,Lee, Kon‐,Bae,Chang, Hye‐,Jung,Ahn, Jae‐,Pyoung,Park, Jong‐,Ku John Wiley Sons, Ltd 2012 Surface and interface analysis Vol.44 No.11
<P>V‐doped TiO<SUB>2</SUB> nanopowders (Ti<SUB>1‐x</SUB>V<SUB>x</SUB>O<SUB>2</SUB>) were manufactured by aerosol‐assisted chemical vapor synthesis and were annealed for the observation of the oxidation of V and a phase transition. The nanopowder showed the red shift as well as a large visible absorption in UV–vis spectra due to many bridging Ti‐O‐V bonds. Copyright © 2012 John Wiley & Sons, Ltd.</P>
박훈,HyunSeock Jie,채근화,박종구,Masakazu Anpo,Dok-Yol Lee 한국물리학회 2008 Current Applied Physics Vol.8 No.6
Anatase-type TiO₂ nanopowders less than 10 nm in average diameter were synthesized by a chemical vapor synthesis method. The TiO₂ nanopowders showed very poor photocatalytic properties, in spite of their large surface area. With subsequent heat treatment of the TiO₂ powders, their photocatalytic properties determined by measuring the degradation of 2-propanol were improved at temperatures up to 600˚C and then diminished along with formation of a rutile phase. This improvement in the photocatalytic properties of TiO₂ nanopowders was attributed to both a morphology change and a change in the electronic surface characteristics of TiO₂ particles during heat treatment. Anatase-type TiO₂ nanopowders less than 10 nm in average diameter were synthesized by a chemical vapor synthesis method. The TiO₂ nanopowders showed very poor photocatalytic properties, in spite of their large surface area. With subsequent heat treatment of the TiO₂ powders, their photocatalytic properties determined by measuring the degradation of 2-propanol were improved at temperatures up to 600˚C and then diminished along with formation of a rutile phase. This improvement in the photocatalytic properties of TiO₂ nanopowders was attributed to both a morphology change and a change in the electronic surface characteristics of TiO₂ particles during heat treatment.
텅스텐이 도핑된 티타니아 나노분말의 화학기상합성 및 광촉매 활성
박보인(Bo-in Park),강계명(Kae-Myung Kang),지현석(Hyunseock Jie),송봉근(Bong-Geun Song),박종구(Jong-Ku Park),조소혜(So-Hye Cho) 한국가스학회 2012 한국가스학회지 Vol.16 No.6
티타니아(TiO₂) 나노분말의 우수한 광촉매 활성은 이를 친환경 소재로서 많은 주목을 받도록 하였다. 특히, 최근 들어 이러한 TiO₂의 광촉매 활성을 향상시키기 위하여 TiO₂ 나노분말에 금속 혹은 비금속 원소를 도핑하는 방법이 널리 시도되고 있다. 화염법, 화학기상합성법, 졸-젤법, 공침법, 이온 주입법 등 다양한 방법들이 사용되고 있으며 합성법에 따라 원소들의 도핑 거동이 달라지므로 TiO₂의 전자구조 및 표면성질들이 합성법의 영향을 받게 되며 광촉매 활성 역시 달라진다. TiO₂의 광촉매 활성은 합성법 자체에 영향을 받는 것 외에 후속의 열처리에 의해서도 달라질 수 있다. 본 연구에서는 우수한 광촉매 활성을 가진 TiO₂ 나노분말 소재를 제조하기 위하여 화학기상 합성법(chemical vapor synthesis, CVS)으로 텅스텐(W) 원소가 도핑된 TiO₂ 나노분말을 제조하고 물성 및 광촉매 특성을 조사하였다. 일부의 TiO₂ 나노분말은 300℃~700℃ 범위에서 열처리한 후 물성 및 광촉매 특성의 변화를 조사하였다. Photocatalytic properties of TiO₂ nanopowders has been received much attention due to their high potentials for environmental applications such as remediation of polluted environments. The TiO₂ nanopowders doped with metal or non-metal elements have been synthesized by variety methods such as flame method, chemical vapor synthesis, sol-gel, ion implantation, which affect a doping behavior in different ways resulting in different surface characteristics, leading to different photocatalytic activity. In addition to an effect of synthesis methods, the photocatalytic activity of TiO₂ nanopowders can be improved by subsequent heat-treatments. In this study, to obtain a highly efficient photocatalyst, we synthesized TiO₂ nanopowders doped with tungsten by the chemical vapor synthesis method (CVS) and determined their physical properties and photocatalytic activity, together with subsequent post-treatment in the range of 300℃ to 700℃.
화염법에 의한 천이금속 첨가 이산화티타늄 나노분말의 제조
박훈,지현석,이승용,안재평,이덕열,박종구,Park Hoon,Jie Hyunseock,Lee Seung-Yong,Ahn Jae-Pyoung,Lee Dok-Yol,Park Jong-Ku 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.6
Nanopowders of titanium dioxide $(TiO_2)$ incorporating the transition metal element(s) were synthesized by flame synthesis method. Single element among Fe(III), Cr(III), and Zn(II) was doped into the interior of $TiO_2$ crystal; bimetal doping of Fe and Zn was also made. The characteristics of transition-metal-doped $TiO_2$ nanopowders in the particle feature, crystallography and electronic structures were determined with various analytical tools. The chemical bond of Fe-O-Zn was confirmed to exist in the bimetal-doped $TiO_2$ nanopowders incorporating Fe-Zn. The transition element incorporated in the $TiO_2$ was attributed to affect both Ti 3d orbital and O 2p orbital by NEXAFS measurement. The bimetal-doped $TiO_2$ nanopowder showed light absorption over more wide wavelength range than the single-doped $TiO_2$ nanopowders.