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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 50678 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Sadrnezhad, Khatiboleslam
- Abstract:
- Transparent conductive electrode (TCE) is one of the indispensable constituent of optoelectronic devices, which heretofore various materials such as ITO, graphene, CNT, metal nanowire and nanofiber network have been used to produce them. It should also be assumed that the use of low-cost materials, which has cost-effective production method, is essential for the construction of transparent electrodes. Copper nanofiber network film which is obtained from electrospinning process is a promising candidate among these materials because it has superiorities, such as low sheet resistance, proper flexibility and abundance in ground resources, scalable and cost-effective fabrication method. There are four steps to producing TCE with copper nanofiber networks, the first step, making electrospinning solution containing copper acetate and polyvinyl alcohol, the first step electrospinning the composite nanofibers, the third step, calcination the electrospun nanofibers, and the last step, reduction the copper oxide nanofibers to copper nanofibers. Also, the parameters of electrospinning process have a great effect on electrospun nanofibers diameter in the first step and continuity of copper nanofibers in the third step. However, there are several parameters and conditions in multi-step fabrication method of nanofiber networks, which affect the continuity and electrical conductivity of nanofiber networks. Here, the relationship between electrospinning process parameters and the electrospun nanofiber diameter, as well as their influence on the continuity and conductivity of the nanofiber networks, have been investigated by FESEM analysis. . In addition, appropriate temperatures for calcination and reduction processes have been investigated using TGA and DTA analysis in order to decrease the electrical resistivity of copper nanofiber networks by forming continuous nanofiber network with fused junctions. Consequently, with determination of proper parameters for electrospinning process and improvement some conditions of calcination and reduction processes, the sheet resistance and transparency of transparent electrode have been reached to 20 Ω⁄sq and 81% respectively
- Keywords:
- Calcination ; Reduction (Chemistry) ; Electrospinning ; Transparent Conductive Electrode ; Metallic Nanofiber ; Copper Nanofiber
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