Fabrication of Closed packed Single-walled Carbon Nanotube film with nanometer thickness
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Fabrication of Closed packed Single-walled Carbon Nanotube film with nanometer thickness Jun Matsui1,2, Kohei Yamamoto1, and Tokuji Miyashita1 1 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan 2 Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, 4-1-8, Honcho, Kawaguchi, 332-0012, Japan ABSTRACT Closed packed film of single-walled carbon nanotubes (SWCNTs) with nanometer thickness was fabricated using a liquid-liquid interface. SWCNTs were solubilized into water using sodium dodecyl sulfate as a surfactant. The SWCNTs in SDS-water suspension were used as a water phase and n-hexane was added to the suspension to form a liquid-liquid interface. After addition of ethanol to the mix solution, SWCNTs were assembled at the interface. The film form at the interface was transferred onto a silicon substrate. The AFM image of the transferred film shows a closed packed SWCNT film with a few nanometers thicknesses. INTRODUCTION Single-walled carbon nanotubes (SWCNTs) have much attention due to its unique electric and optical properties [1,2] Moreover, because of its mechanical properties such as high tensile strength and high flexibility [2, 3], SWCNTs have been applied in a flexible electric devices [4-6]. For such application, it is important to assemble SWCNTs into two to three dimensional order. The assembly technique includes, spin coating [7], Langmuir-Blodgett technique [8-10], layer-by-layer assembly [11-13] and so on. Recently we have reported a technique to fabricate ultrathin film of multi-walled carbon nanotubes (MWCNTs) using a liquid-liquid interface [14, 15]. The assembling technique using a liquid-liquid interface requires MWCNTs to solubilize in water. In the previous report, oxygen functional groups were chemically attached onto the MWCNTs surface to solubilize MWCNTs into water [14, 15]. However, the chemical treatment of CNTs affects their electric properties. In the paper SWCNTs were solubilize in water by coating the SWCNTs with sodium dodecyl sulfate (SDS) micelle [16]. Coating SWCNTs with SDS enables SWCNTs to disperse in water without chemical treatment of the surface. The SWCNTs in SDS-water suspension was used as a water phase and n-hexane was added to the suspension to form a liquid-liquid interface. After addition of ethanol to the mix solution, SWCNTs were assembled at the interface. The film assembled at the interface was transferred at a solid substrate using the Langmuir-Blodgett technique and the transferred film was characterized by atomic force microscope measurement. . EXPERIMENT Single-walled carbon nanotubes synthesized by HiPco method was purchased from Sumitomo Corporation and used as received. Sodium dodecyl sulfate, deuterium oxide (D2O), nhexane and ethanol were obtained from Wako chemicals and used as received. Ten milligrams of
SWCNT and 0.15 mg of SDS was dissolved in 15 mL of water or D2O and sonicated by 2 h at 40 kHz. Then the
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