奈米級材料因高表面積效應使其展現微米顆粒所不及之物理及化學性質因而受到高度注目。本論文中，我們已成功的建立獨特之直流電漿熱反應設備，並研發出製作量產型金屬氧化物奈米粉體技術。直流熱電漿系統可製作出且有65 %高比例之四足錐狀氧化鋅，本研究將探討四足錐狀氧化鋅比例與直流熱電漿系統操控參數的關係，也將四足錐狀氧化鋅之光學，光穩定性及光觸媒等特性作一系列之研究。進而本論文亦將四足錐狀氧化鋅應用於自清潔及抗菌之疏水塗層，且深入探討由tetrapod ZnO及SiO2奈米粉體組成之複合微米結構體所造成之疏水及抗菌效應並討論其機制。此外，利用操控直流熱電漿系統參數，將鋅錫合金線材製成具有高結晶性之Zn2SnO4奈米粉體並討論電漿能量密度和Zn2SnO4純度關係，及量測純Zn2SnO4光學性質並製作成光敏性太陽能光電電池元件以作研究。

Recently, materials with nanometer size have received tremendous attention
due to their abnormal behavior and very attractive physical and chemical properties.
In this thesis, a new technique (DC thermal plasma method) for producing nano metal
oxide powders with high yield rate (0.8~1 kg/h) was thoughtfully studied. The
excellent relationships of the crystalline phase of a product with the operation
parameters were observed.
The effects of operating parameters on the content ratio of tetrapod-ZnO (TZ) in
the DC thermal plasma produced ZnO nanopowders was investigated in Chapter 3. As
high as 65% tetrapod- ZnO content in the mixture (TZ-65) could be synthesized in
present study. The optical properties, photostability and photocatalytic behaviors of
the as-grown and the annealed TZ-65 ZnO nanopowders were examined in detail.
In Chapter 4, the feasibility of applying tetrapod- ZnO in self-cleaning and
anti-microbial coating was investigated. The effect of adding tetrapod- ZnO
nanoparticles on surface morphology of the micro-nanoscale binary structured
ZnO/SiO2, the retention of hydrophobicity, and the antimicrobial property of the
coating were examined.
The well-crystallized Zinc stannate (Zn2SnO4) (ZTO) nanopowders were
fabricated from commercial Zn-Sn alloy wire with the DC thermal plasma reactor and
thoughtfully studied in Chapter 5. The effect of processing parameters (i.e. plasma
energy density) on the phase composition of synthesized ZTO and the optical property
of the ZTO nanopowders were studied. In addition, the I-V characteristics for ZTO
dye-sensitized solar cell were also investigated.

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