"分子級自旋電子學, 利用分子調控奈米磁性, 及石墨烯分子的 奈米技術"

Abstract

整合分子電子學、磁學、碳基科學和奈米科技形成新興跨領域的分子自旋電子學、奈米磁學和石墨烯科學。 在此論文中，有三個主要的題目： 1. 運用分子級技術製備分子自旋閥。 2. 利用單分子層調控奈米薄膜的磁性。 3. 轉移可控制分子密度的石墨烯分子。 實驗結果顯示，利用分子級技術製備的分子自旋閥可以展現清楚的室溫穿隧磁阻效應，此結果表明大面積分子策略可以成功解決之前分子自旋閥的複雜磁阻問題。 另一方面，我們確定了單分子層的官能基會影響鄰近鐵磁奈米薄膜的磁性，此結果告訴我們在設計分子級自旋電子元件時必須考慮或利用這個重要的效應。 在第三部分，我們設計了一種新方法去轉移可控制分子密度的石墨烯到不同的基板，這對於石墨烯的應用是必需的。 此研究提供了重要資訊去設計和製備具備可撓性和非揮發性的奈米電子元件。

Molecular spin electronics, nano-magnetism, and graphene science are new emergence interdisciplinary field which combine the molecular electronics, magnetism, carbon-based science, and nanotechnology. In this thesis, we try to study three main topics related to above research: (i)fabrication of molecular spin valve with molecular technology. (ii) molecular tuning of nanomagnetism of magnetic thin-films. (iii) transfer of transparent graphene with controllable molecular density. The results show that we could observe room-temperature tunnel magnetoresistance effect in Langmuir-Blodgett-film molecular spin valve, and its clear parallel/antiparallel states prove our strategy of large-area molecular junction could solve the geometric problem in previous molecular spin valve. On the other hand, we also confirm the functional group of molecular monolayer could influence the ferromagnetic (FM) properties of FM thin-film, and it means we need to consider this effect in fabricating molecular-level spin electronic devices. In the third topic, we design an alternative way to transfer the graphene layer with controllable molecular density to the substrate with different surface property which is necessary for different application. These studies may provide useful information for design and fabricating flexible non-volatile electronic devices for future application.