本論文的研究目的是發展一種可用來合成金奈米材料的新方法。藉由結合反應動力學與流體力學的操控，我們可在微流體系統中獲得定義明確的金奈米線與金奈米結晶物質。這個合成反應是在一個連續式的微流體反應器中進行，藉由控制流量及化學反應條件並配合反應器設計，我們可以得到一些不尋常的金奈米結構，而這些結構是無法利用一般傳統的批式反應器來獲得。

實驗結果顯示在低流量下，會有金奈米線的生成，若流量增加，佔生成物大多數的則是具有不同形狀的金奈米結構。我們也發現反應器的設計在金奈米線的生成中扮演關鍵性的角色。我們所使用的連續式微流體反應器是由兩種不同的幾何構造所組成，一個是Tesla曲流道，另一個則是單純的直線結構，把這兩種微流體幾何結構作一適當的安排，可設計出一個最佳的微流體反應器來合成一維的金奈米線狀結構。此外，我們也提出一個合理的機制來解釋為何可利用連續式微流體反應器可合成金奈米線狀結構。此機制的特點在於流體力學之效應可提供另一新的途徑來操控過程中之時間尺度及反應動力學。這個研究不僅能為合成奈米材料提供一個新的對策，而且還具有可與其他的微流體元件進行整合的優勢，在微晶片 (lab on a chip)之應用具開發潛力。

A novel method to synthesize gold nanomaterials is reported in this thesis. A combination of reaction kinetics and hydrodynamic manipulation gives a birth of well-defined gold nanowires and nanocrystals. By controlling the flow rate in concert with proper reaction conditions and channel designs, we can obtain some unusual gold nanostructures that cannot be achieved by conventional batch methods.

The results show that well-defined one-dimensional nanowires can form at low flow rates, and a variety of nanocrystals at high flow rates. We also find that the design of a microreactor is critical to the formation of nanowires. An optimized microreactor design comprises a number of non-straight structures and straight channels. We also propose a plausible mechanism to explain the formation of gold nanowires using continuous microreactor. The novelty here is that hydrodynamic effects provide alternative routes to manipulating various time scales and hence the kinetics of the process. These effects can be only realized in continuous microreactor, but not in convectional batch reactors.

This work not only provides a new paradigm for synthesis of nanomaterials, but also could be advantageous to integrating other microfluidic devices for subsequent analyses.

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