FABRICATION AND CHARACTERIZATION OF MULTIWALL CARBON NANOTUBE BASED TRANSPARENT CONDUCTIVE FILMS ON POLYETHYLENE TEREPHTHALATE SUBSTRATES

• Main Author: IRMAWATI (NIM: 23715308), YUYUN
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24839
• Institution: Institut Teknologi Bandung

Transparent conducting films (TCF) are a critical component in many <br /> <br /> <br /> <br /> <br /> optoelectronic devices. Indium tin oxide (ITO) is widely used in TCF’s industries <br /> <br /> <br /> <br /> <br /> due to their excellent optoelectronic properties. However, their brittleness is not <br /> <br /> <br /> <br /> <br /> compatible with future flexible electronics developments. Recent studies have <br /> <br /> <br /> <br /> <br /> shown that carbon nanotubes (CNT) provide unique chemical, optoelectronic, and <br /> <br /> <br /> <br /> <br /> mechanical properties, making them an important alternative to ITO. In this study <br /> <br /> <br /> <br /> <br /> we evaluated fabrication and optoelectronic performance of transparent conductive <br /> <br /> <br /> <br /> <br /> films based on CNT using a spin coating technique. Multiwalled carbon nanotube <br /> <br /> <br /> <br /> <br /> (MWCNT) with six different concentrations, 0.1, 0.2, 0.3, 0.4, 0.5, and 1 wt.% was <br /> <br /> <br /> <br /> <br /> dispered in carboxymetyl cellulose (CMC) solution using probe-sonicator for 60 <br /> <br /> <br /> <br /> <br /> min. The mixture then was centrifuged at 8000 rpm (20 min). MWCNT ink was <br /> <br /> <br /> <br /> <br /> coated onto polyethylene terephthalate (PET) substrates using spin-coater at 1000 <br /> <br /> <br /> <br /> <br /> rpm (50 s). The sonication-driven dispersion of MWCNT in aqueous CMC solution <br /> <br /> <br /> <br /> <br /> had been monitored by UV–Vis spectroscopy and transmission electron microscope <br /> <br /> <br /> <br /> <br /> (TEM). Sheet resistance (Rs) and optical transmittance (T) of TCF-MWCNT were <br /> <br /> <br /> <br /> <br /> investigated using four point probe method and UV-Vis spectroscopy, respectively. <br /> <br /> <br /> <br /> <br /> Field emission scanning electron microscope and atomic probe microscope were <br /> <br /> <br /> <br /> <br /> also used to characterize the surface morphology and topology of the TCF. Bending <br /> <br /> <br /> <br /> <br /> experiments to measure a change in the electrical resistance were also performed <br /> <br /> <br /> <br /> <br /> manually. This study shows that optoelectronic properties of MWCNT films were <br /> <br /> <br /> <br /> <br /> highly dependent on the MWCNT concentrations. The best performance was <br /> <br /> <br /> <br /> <br /> obtained from the ink with MWCNT concentration of 0.4 wt.% with corresponds <br /> <br /> <br /> <br /> <br /> to Rs ~20 k&#61527;/sq and T ~ 50% (at 550 nm). TCF-MWCNT also presented excellent <br /> <br /> <br /> <br /> <br /> electrical stability after 100 bend cycles which not achievable with ITO. There was <br /> <br /> <br /> <br /> <br /> only 1.6 increase in the electrical resistance for TCF-MWCNT, compare to 22 times <br /> <br /> <br /> <br /> <br /> for those with TCF-ITO. These results suggest that TCF-MWCNT have a great <br /> <br /> <br /> <br /> <br /> potential for flexible electronic devices.