The CNTs synthesized by us are from Floating Catalyst Chemical Vapor Method, but the tensile strength is very weak, the conductivity is low as well, asking for suggestion about the easy approach to increase its mechanical and electrical properties.
Dear Daniel,
Have you done Raman spectroscopy on your carbon nanotubes and TEM to know their properties. Multiwalls or single walls? If they are multiwalls, the conductivity can be very low. Most of important is to characterise your samples. Then you will find out why your carbon nanotubes have low conductivity and low mechanical strength.
Dear Daniel, Yes we need more information. Apart from them, which ware mentioned by Xuhua Wang, I am interested in which flow you used (chemical composition).
Can we utilise conductivity as a parameter to distinguish between single-wall and multi-wall CNTs?
Xuhua Wang Thanks Dr Wang, the CNTs that synthesized by us mainly are multi-wall CNTs, we have done some characterizations, weak strength and low conductivity have been the inherent problem when producing CNTs in macro-scale, we are trying to incorporate other elements like Cu into CNT network to bond CNTs, do you any suggestions in this aspect, thanks very much.
Roman Fiala , Thanks Dr. Fiala, we used Ferrocene as catalyst, methanol as carbon source, flow rate usually range from 1000SCCM to 1500 SCCM.
Muhammad Shahbaz Anwar Hi Dr Anwar, generally speaking, Single-wall CNT has higher conductivity than multi-wall one, but It is not sufficient enough to make the conductivity as the parameter to distinguish single-wall from multi-wall CNTs, correct me if I am wrong.
Dear Daniel,
The property of multiwalled carbon nanotubes is very different from single walled carbon nanotubes due to the differences of their structures, which determine the differences of the conductivity, mechanical and thermal conducting properties. If you want to make mechanical strength and high conducting CNT composites, SWCNTs are strongly recommended to work on.
There are some references you could google search easily.
Hope it helps
Xuhua
The vertical growth of sheet will increases the conductivity and mechanical strength, therefore you should care during the deposition process by controlling the deposition parameters and precision,
Unzipping of CNTs to form GNRs is one of the best methods to get higher strength and conductivity.
- Dmitry V. Kosynkin et. al., Nature volume 458, pages 872–876 (16 April 2009)
You might have made a textile, that is missing a (mechanical and electrical) binder[1] polymeric material(s), in order to obtain your high (mechanical and electrical) specs; maybe, you would like, to follow "similar concepts" used to make better the reinforced concrete[2,3].
Also, a textile material's conductivity by EIS measurements[4] offers more infos about the limiting factor(s) of the (high) conductivity, beyond DC-conductivity.
1. Chemical Vapor Deposition Polymerization for Conducting Polymer Thin-Film Coating http://www.aimcal.org/uploads/4/6/6/9/46695933/jin.pdf
2. https://en.wikipedia.org/wiki/Reinforced_concrete
3. https://www.thespruce.com/difference-between-cement-concrete-and-mortar-2130884
4. https://www.gamry.com/application-notes/EIS/basics-of-electrochemical-impedance-spectroscopy/
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