Thermodynamics and kinetics of polyoxyethylene alkyl ether evaporation from inkjet-printed carbon nanotube thin films by vacuum annealing

被引:1
|
作者
Horike, Shohei [1 ]
Fukushima, Tatsuya [1 ]
Saito, Takeshi [2 ]
Koshiba, Yasuko [1 ]
Morimoto, Masahiro [1 ,3 ]
Misaki, Masahiro [1 ,4 ]
Ishida, Kenji [1 ]
机构
[1] Kobe Univ, Grad Sch Engn, Dept Chem Sci & Engn, Nada Ku, 1-1 Rokkodai Cho, Kobe, Hyogo 6578501, Japan
[2] Natl Inst Adv Ind Sci & Technol, Nanomat Res Inst, 1-1-1 Higashi, Tsukuba, Ibaraki 3058565, Japan
[3] Univ Toyama, Grad Sch Sci & Engn Res, 3190 Gofuku, Toyama 9308555, Japan
[4] Kindai Univ, Tech Coll, Dept Comprehens Engn, Elect & Elect Syst Course, 7-1 Kasugaoka, Nabari 5180459, Japan
来源
FLEXIBLE AND PRINTED ELECTRONICS | 2018年 / 3卷 / 02期
关键词
carbon nanotube; nonionic surfactant; inkjet printing; removal process; VAPOR-PRESSURE; THERMOGRAVIMETRIC ANALYSIS; SURFACTANT; DISPERSION; NANOCOMPOSITES; TEMPERATURE; COMPOSITES; OXIDATION; SULFATE; PURITY;
D O I
10.1088/2058-8585/aac349
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Carbon nanotubes (CNTs) dispersed in water by sonication with surfactants are used as printing inks. However, surfactants are usually electrical insulators that remain on the prepared CNT films, reducing their conductivity. While evaporation by annealing is an effective removal process, it is usually performed at high temperatures (180 degrees C) in air, making it inapplicable for printing on common plastic substrates. This work demonstrates a vacuum annealing process for evaporating surfactants. Poly(oxyethylene) 4 lauryl ether (Brij L4)-a nonionic surfactant-was utilized. Its evaporation behaviors (thermodynamics and kinetics) were analyzed by thermogravimetric (TG) analysis and infrared (IR) spectroscopy. The TG measurements confirmed that the evaporation onset temperature under vacuum (51.0 degrees C) was lower than that in air (148.7 degrees C). The IR results revealed that similar to 100% Brij L4 was removed by annealing under vacuum at 130 degrees C. The desorption energy of the surfactant from CNTs was calculated from the activation energy results to be about 10 kJ mol(-1); this value is about a half to one order of magnitude smaller than those reported for other surfactants. This energy would allow adequate adsorption interactions for the surfactant to stably disperse the nanotubes, but is sufficiently small to allow easy removal of the surfactant by thermal treatment. The electrical resistance of the vacuum-annealed CNT thin film dramatically decreased compared with that of the film annealed in air. Therefore, this process can be used for fabricating flexible printed electronics with CNTs.
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页数:8
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