Geçirgen ve iletken tek duvarlı karbon nanotüp ince filmlerin hazırlanması

The need for transparent conductive films is growing rapidly as electronic devices, such as touch screens, displays, solid state lighting, and photovoltaics become essential in our lives. Doped metal oxides, in particular industry standart indium tin oxide, are the most widely used materials for transparent conductors. However, these materials have several drawbacks, including a high refractive index and haze, spectrally nonuniform optical transmission, limited flexibility, and a depleted raw material supply and exploration of alternative materials has become inevitable. Because of their high intrinsic carrier mobility, conductivity, and mechanical stability carbon nanotubes (CNTs) are promising materials for electronics, as transparent conductors. There are two commonly used methods for depositing SWNTs on substrates-transferring CVD-grown SWNTs or deposition of solution processed SWNTs. Since CVD grown SWNTs can be highly aligned, they often outperform solution-processed SWNT films that are typically in the form of randomly construcred networks. On the other hand, solution-based SWNTs can be printed at a large-scale and at low-cost, rendering them more appropriate for manufacturing. In this thesis, transparent and conductive SWNT electrodes were fabricated on glass substrates. SWNTs were firstly synthesized by chemical vapor deposition of acetylene on Fe/MgO catalyst at 800°C and purified by 6M HNO3 at 98.39 % purity level. Spray coating method was utilized for the deposition of SWNTs. Effects of sonication time, density of SWNT films, dispersing media, CNT type and post-deposition acid treatments were investigated. Fabricated SWCNT thin films were characterized by scanning electron microscopy (SEM) and UV-vis spectrophotometer. Four point probe measurements were also performed for determination of the sheet resistance values of SWCNT thin films on glass substrates and the resultant properties were compared. It has been found that, 195 Ω/sq sheet resistance can be achieved at an optical transmittance of 75 % for Tuball-SWNT thin films on glass substrates that were deposited via spray coating method. All of the fabricated films were found to be mechanically robust, with no tendency to delaminate from the underlying substrate.