Abstract
We report floating catalyst chemical vapour deposition synthesis of single-walled carbon nanotubes (SWCNTs) for high-performance transparent conducting films (TCFs) using low feeding rate of precursor solution. Herein, ethanol acts as carbon source, ferrocene and thiophene as catalyst precursor and growth promoter, respectively. By adopting a low feeding rate of 4 µl min−1, the fabricated TCFs present one of the lowest sheet resistances of ca 78 Ω sq.−1. at 90% transmittance. Optical characterizations demonstrate that the mean diameter of high-quality SWCNTs is up to 2 nm. Additionally, electron microcopy observations provide evidence that the mean length of SWCNT bundles is as long as 28.4 µm while the mean bundle diameter is only 5.3 nm. Moreover, very few CNT loops can be found in the film. Remarkably, the fraction of individual SWCNTs reaches 24.6%. All those morphology data account for the superior optoelectronic performance of our SWCNT TCFs.
Highlights
Single-walled carbon nanotubes (SWCNTs) have exceptional electrical and unique optical properties, rendering them being applied in various application fields, especially in transparent conducting films (TCFs) [1,2,3,4]
We report floating catalyst chemical vapour deposition synthesis of single-walled carbon nanotubes (SWCNTs) for high-performance transparent conducting films (TCFs) using low feeding rate of precursor solution
After optimizing growth parameters by the assessment of optoelectronic performance, samples were collected for optical spectroscopy and electron microscopy characterizations to figure out the reason behind the outstanding conductivity of SWCNT TCFs
Summary
Single-walled carbon nanotubes (SWCNTs) have exceptional electrical and unique optical properties, rendering them being applied in various application fields, especially in transparent conducting films (TCFs) [1,2,3,4]. The fabrication methods of SWCNT TCFs are dominated by solution method [1,3,5] and dry-transfer method [2,6,7]. Method in regard to retaining the primordial features of SWCNTs, because as-produced SWCNTs are 2 collected at the outlet of a reactor using a membrane filter to form a thin film which can be presstransferred to a target substrate. Features like diameter [8], length [2] and bundle diameter [9] of SWCNTs can be controlled via adjusting growth parameters
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