please suggest me the best way to coat the functionalized MWCNT on the copper plate firmly. I don't want to add the binder because it is adding up the conductivity. I tried with drop casting, brush coating but it not happening. I have roughened the surface too.
Since your CNTs are functionalized with negatively charged ions, a self-assembled monolayer with exposed (potentially) positive charges like amine groups is likely to help. See for example
ma.ecsdl.org/content/MA2010-02/4/217.full.pdf
Physical vapor deposition process is used to coat the CNTs with a varying thickness of copper to promote surface wetting with the working fluid, water. Thermal performance of the bare sintered copper powder sample (without CNTs) and the copper-functionalized CNT-coated sintered copper powder wick samples is compared using an experimental facility that simulates the capillary fluid feeding conditions of a vapor chamber.
You can try electrophoretic deposition (EPD). it doesnt need to complex equipment. you can do it with a DC power supply with a voltage range up to 30 V. firstly you have to make a stable suspension of MWCNTs in acetone. i have tried it before by adding 50 mg of MWCNTs in 100 ml acetone and 10 mg iodine (iodine acts as surfactant and helps to easily movement of MWCNTs particles trough the suspension). Then place your copper electrode as cathode (-) and use a SS316 plate as anode (+) and apply a DC voltage of 25-30 volt between anode and cathode. after 10 mins your MWCNTs deposit on cathode and you can remove that.
@Farid movassagh , cathode in negative terminal and anode in possitive terminal ??? are you sure ? if I am not wrong
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