High-yield preparation of transparent films with large-diameter CNTs via FCCVD
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Journal Title
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Volume Title
Perustieteiden korkeakoulu |
Master's thesis
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Authors
Date
2019-12-17
Department
Major/Subject
Physics of Advanced Materials
Mcode
SCI3057
Degree programme
Master’s Programme in Engineering Physics
Language
en
Pages
43+2
Series
Abstract
Carbon nanotube (CNT) thin films are the promising material to replace indium tin oxide for the applications in transparent and conductive electronics. We report the synthesis of high-yield CNTs with CH4 as carbon source via floating catalyst chemical vapor deposition (FC-CVD) system. With the optimized synthesis parameters, CNT TCFs have a sheet resistance of 59 Ω/sq at 90 T% with 10 min collection on a 4.7 cm diameter filter. Here, the yield of CH4-based CNT film is much higher than those of other SWCNT films, e.g. 20 times of CO-based single-walled carbon nanotube (SWCNT) films with 86.8 Ω/sq at 90 T%, 150 times of C2H4-based SWCNT films with 51 Ω/sq at 90 T% and 10 times of C2H6O-based SWCNT films with 78 Ω/sq at 90 T%. Moreover, we applied TEM and SEM to analyze the morphology of CNTs. Surprisingly, double-walled carbon nanotubes (DWCNTs) with the proportion up to 80% were found. These DWCNTs with a diameter of 3.5-6 nm constitute into bundles with a mean diameter of 8.3 nm and a mean length of 14.52 μm. We believe these DWCNTs with unique morphology contribute to high-performance CNT TCFs with high yield.Description
Supervisor
Kauppinen, Esko I.Thesis advisor
Zhang, QiangKeywords
single walled carbon nanotube, carbon nanotube, floating catalyst chemical vapor deposition, transparent conductive film