奈米金粒子自組成薄膜之特性研究

Characteristics of self-assembled Au nanoparticle films

邱德安(De-An Chiua)

指導教授 ： 許經夌

中原大學/理學院/應用物理研究所/碩士(2005年)

https://doi.org/10.6840/cycu200500693

摘要

中文摘要
在這個實驗中，我們測量了無序自組成奈米結構的電導與計算其活化能，此種結構我們稱之為奈米網路。這奈米結構是由有機分子鏈結奈米金粒子自組成在玻璃基板上，將奈米金粒子與1-6雙己烷硫醇滴在玻璃基板上寬100微米的電極之間，1-6雙己烷硫醇會連結奈米金粒子形成奈米網路結構，我們使用了原子力顯微鏡與掃描式電子顯微鏡觀察它的表面形貌，發現粒子有很強的凝聚現象，且粒子大都分佈成島狀結構，並在變溫系統裡，測量無序陣列的活化能，並且測量其電流電壓的關係，觀測到的結果可以用“Orthodox model”來解釋，以5nm奈米金粒子自組成薄膜而言，其電容值約為6.05×10-17F，電子充電能約為1.32meV，並可以估算其庫倫阻斷連結的數量，進而分析其阻抗與其他資訊。

關鍵字

I-V曲線 ； 奈米粒子 ； 金 ； 無序 ； 雙硫醇 ； 展透 ； 自組成 ； 庫倫阻斷 ； 活化能 ； 電導

並列摘要

Abstract
In this experiment, we measured the electrical conduction and the related activation energy of disordered self-assembled nanoparticle structure. This nanoparticle structure is called as "nano-network". The nanoparticle structure is self-assembled by molecularly linked gold nanoparticles on glass substrates. Gold nanoparticles and 1,6-hexanedithiol were deposited between electrical contacts separated by 100 μm. The gold nanoparticles are connected each other by dithiol molecules and form a hexagonal nano-network structure. The nano-structure was observed by atomic force microscope and scanning electron microscope. We find that the particles have a strong aggregation effect and most of the particles aggregate to form islands. The activation energy and the current-voltage relationship of the nano-network are examined in variable temperatures. The observations are in agreement with the "Orthodox model" predictions using first-order high-temperature approximations. For example, the capacitance of self-assembled 5 nm Au nanoparticle film is about 6.05×10-17F and its charging energy is about 1.32meV. We can also use the model to estimate N（where N is the number of Coulomb blockade junctions）. Finally we analyze the impedance and the other information of the nano-network.

並列關鍵字

Coulomb blockade ； conductance ； nanoparticle ； self-assembled ； percolation ； I-V curve ； disorder ； gold ； Au ； activation energy ； dithiol

參考文獻

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參考資料

[ 1] T. Sato, H. Ahmed, D. Brown, and B.F. G. Johnson, Journal of Applied Physics 82(2), 696-701（1997）

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