Morphology Control of Surfactant-Assisted Graphene Oxide Films at the Liquid鈥揋as Interface
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- 作者：Hyeri Kim ; Young Rae Jang ; Jeseung Yoo ; Young-Soo Seo ; Ki-Yeon Kim ; Jeong-Soo Lee ; Soon-Dong Park ; Chan-Joong Kim ; Jaseung Koo
- 刊名：Langmuir
- 出版年：2014
- 出版时间：March 4, 2014
- 年：2014
- 卷：30
- 期：8
- 页码：2170-2177
- 全文大小：504K
- 年卷期：v.30,no.8(March 4, 2014)
- ISSN：1520-5827
文摘
Control of a two-dimensional (2D) structure of assembled graphene oxide (GO) sheets is highly desirable for fundamental research and potential applications of graphene devices. We show that an alkylamine surfactant, i.e., octadecylamine (ODA), Langmuir monolayer can be utilized as a template for adsorbing highly hydrophilic GO sheets in an aqueous subphase at the liquid鈥揼as interface. The densely packed 2-D monolayer of such complex films was obtained on arbitrary substrates by applying Langmuir鈥揝chaefer or Langmuir鈥揃lodgett technique. Morphology control of GO sheets was also achieved upon compression by tuning the amount of spread ODA molecules. We found that ODA surfactant monolayers prevent GO sheets from sliding, resulting in formation of wrinkling rather than overlapping at the liquid鈥揼as interface during the compression. The morphology structures did not change after a graphitization procedure of chemical hydrazine reduction and thermal annealing treatments. Since morphologies of graphene films are closely correlated to the performance of graphene-based materials, the technique employed in this study can provide a route for applications requiring wrinkled graphenes, ranging from nanoelectronic devices to energy storage materials, such as supercapacitors and fuel cell electrodes.