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Metalorganic chemical vapor depositi...

Li, Weidong.

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Metalorganic chemical vapor deposition and characterization of titanium dioxide nanoparticles.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Metalorganic chemical vapor deposition and characterization of titanium dioxide nanoparticles./
作者:	Li, Weidong.
面頁冊數:	138 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5722.
Contained By:	Dissertation Abstracts International64-11B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3112682

Metalorganic chemical vapor deposition and characterization of titanium dioxide nanoparticles.
Li, Weidong.

Metalorganic chemical vapor deposition and characterization of titanium dioxide nanoparticles. - 138 p.

Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5722.

Thesis (Ph.D.)--University of Delaware, 2004.

Metalorganic chemical vapor deposition (MOCVD) was used to synthesize all the TiO2 nanoparticles. Size optimization and doping method were applied to improve the photoreactivity of TiO2.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Metalorganic chemical vapor deposition and characterization of titanium dioxide nanoparticles.
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245 1 0 $a Metalorganic chemical vapor deposition and characterization of titanium dioxide nanoparticles.
300 $a 138 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5722.
500 $a Professor in charge: S. Ismat Shah.
502 $a Thesis (Ph.D.)--University of Delaware, 2004.
520 $a Metalorganic chemical vapor deposition (MOCVD) was used to synthesize all the TiO2 nanoparticles. Size optimization and doping method were applied to improve the photoreactivity of TiO2.
520 $a Due to the crucial role of particle size in the photoreactivity improvement, the effects of synthesis conditions (deposition temperature and oxygen flow rate and partial pressure) on the size and size distribution were investigated. Growth mechanism of TiO2 nanoparticles was studied to reveal the particle formation behavior. The size dependence of structural, optical, and photocatalytic properties of nano-TiO2 was quantified. Anatase with sizes of 12, 17, and 23 nm were selected. Results showed that the thermal stability of anatase decreased with reduction of particle size and 12-nm particles had the lowest activation energy (180 kJ/mol for anatase to rutile phase transformation). The ultraviolet (UV)-visible light absorption measurements exhibited that absorption edge had a red shift with the decrease of particle size. Photodegradation of 2-chlorophenol (2-CP) solutions under the irradiation of UV presented that 17-nm sample had the highest photoreactivity.
520 $a Doping of various metal ions was studied to enhance the photoreactivity of TiO2. Metal ions Pt4+, Fe3+, Nd 3+, and Pd2+ were selected as dopants. Photodegradation results of 2-CP with UV as an irradiation source showed that most of the doped TiO2 had improved photoreaction rate for 2-CP degradation, except Fe3+. Nd3+ had the largest enhancement. The different photoreactivity was ascribed to the different ionic radii of the dopants. Nd3+ doping was further used for the enhancement of visible light photoreactivity. Various levels of Nd3+ (0, 0.6, 1, 1.5 at.%) doped TiO2 nanoparticles were synthesized. Doping reduced band gap and the maximum reduction was 0.55 eV for 1.5 at.% of Nd doping. The band gap narrowing was shown by light absorption and by work done in collaboration with Professor Chen's group using near edge X-ray absorption fine structure. Work done in collaboration with Professor Doren's group using density functional theory calculations confirmed the band gap narrowing. Preliminary results on the photodegradation of 2-CP with visible light are promising. The Nd3+ doping could provide a possible way to allow TiO 2 to be photoactive in sunlight.
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791 $a Ph.D.
792 $a 2004
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