聯胺處理對單壁奈米碳管網絡薄膜物化特性影響之研究

Effect of Hydrazine Treatment on Physicochemical Characteristics of Single-Walled Carbon Nanotube Networks

廖昱淳(Yu-Chun Liao)

指導教授 ： 王本誠 ； 許瑤真

國立清華大學/原子科學院/先進光源科技學位學程/碩士(2010年)

https://doi.org/10.6843/NTHU.2010.00269

摘要

本研究中藉由熱裂解化學氣相沉積法的方式，以酒精蒸氣作為碳源，利用雙層觸媒系統以便成長出網絡狀單壁奈米碳管薄膜(SWCNT-networks)，並利用濕式蝕刻的方式將高透明度及高導電度的單壁奈米碳管網絡狀薄膜移除下來，並轉移到其他基材上以便繼續對它做還原與氧化的化學修飾(chemical modification)處理。
化學修飾處理主要著重於單壁奈米碳管薄膜經還原劑(聯胺)處理後，實驗結果發現，聯胺處理後碳管表面鍵結了許多NH2，此舉會引起單壁奈米碳管薄膜自發性的摻雜(doping)效應，進而導致單壁奈米碳管薄膜導電特性之改變，其改變機制將利用四點探針(Four-point Probe)、場發射電子顯微鏡(Field Emission Scanning Electron Microscope, FESEM)、拉曼光譜儀(Raman Spectroscopy)、X光光電子能譜儀(X-ray Photoemission Spectroscopy, XPS)、及紫外光光電電子能譜(Ultra-violet Photoelectron Spectroscopy, UPS)的量測，研究當單壁奈米碳管網絡狀薄膜在經還原與氧化處理後，對於其導電特性、整體結構、碳管表面化學鍵結結構以及價帶電子結構的改變行為做一整合性之探討。
文中亦將還原劑處理與一般常見之氧化劑(硫酸)處理後之碳管表面特性做一詳細之比較，並探討已氧化之單壁奈米碳管薄膜經再次聯胺處理後所引起之還原效應。

關鍵字

單壁奈米碳管 ； 聯胺 ； 拉曼光譜儀 ； X光光電子能譜儀

並列摘要

In this study, a simple thermal pyrolysis chemical vapor deposition technique which was used alcohol vapor as the carbon source was synthesized high purity single-walled carbon nanotube on silicon substrate by double-layered catalytic system, and this sample was used a lift-off technique with BOE solution subsequently. After those processes, the SWCNT-networks successfully were separated from the silicon substrate. The lifted-off SWCNT-networks which has excellent optical and electrical properties was transferred the suspended SWCNT-networks to various substrates, and proceeded with chemical modification of reduction and oxidation treatment.
Chemical modification focused primarily on the reducing agent (hydrazine) treatment in SWCNT-networks. As the results of this experiment showed, the surface of SWCNT-networks which were treated by hydrazine has bonded to their sidewalls using amino groups. This situation was induced a spontaneous charge transfer that was led to the doping effect, and the change of SWCNT-networks’ conductivity. The phenomenon of charge transfer was analyzed by the four-point probe systems, field emission scanning electron microscope, Raman spectroscopy, X-ray Photoemission spectroscopy, and Ultra-violet Photoelectron spectroscopy. Though those analyses was investigated the pristine and reacted SWCNT-networks properties of conductive characteristics, the sidewall structure, chemical bonding species and valence bond electronic structure. Those overall results provide a comprehensive exploration.
This paper was also compared the characteristics of hydrazine treatment with acid treatment. We have proposed the reduction effect by hydrazine treated pre-oxidized SWCNT-networks.

並列關鍵字

single-walled carbon nanotube ； hydrazine ； Raman Spectroscopy ； X-ray Photoemission Spectroscopy

參考文獻

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