Nanocomposite-Based Electronic Tongue by Amin TermehYousefi

Author:Amin TermehYousefi
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

3.3 Synthesis of Multilayer Carbon Nanotubes from Camphor Oil by Chemical Vapor Deposition Method

The experimental setup was based on horizontal electronic furnaces used to cover the quartz tube during CNTs fabrication [3]. A mass flow controller was used to adjust the velocity of the argon gas by means of syringe pump into the substrate [4]. 12 mL camphor oil as a precursor was mixed with 0.06 mg ferrocene, and then introduced to the inlet of the horizontal quartz tube of the CVD fitted by the first furnace to release the vaporized CNTs. The reaction temperature was increased to 180 °C [5], and maintained for 30 min to ensure that the camphor oil and ferrocene were completely pyrolyzed. Ferrocene decomposes to form the iron catalyst necessary for the experiment, while camphor acts as a carbon source (feedstock ) of the substrate in the second furnace. The CVD experiments commenced when the deposition temperature of the second furnace reached the optimal temperature (between 750 and 850 °C). The exhaust argon gas in the quartz tube induced movement of the amorphous vaporized carbon into the second furnace, thereby allowing CNTs growth on the surface of the proposed substrate [6]. To identify the relation between the flow rate of the argon gas and CNTs diameter on the silicon substrate (25 mm × 20 mm sized) at the second furnace, three different argon flow rates were employed while the pressure of the reactor (horizontal quartz tube ) was fixed at 1 bar. Argon gas was injected into the inlet of the quartz tube at a maximum velocity of 600 sccm. After 10 min, the velocity was gradually decreased to 400 sccm as its medium range of the argon flow rate. Then, after 20 min, the argon flow rate was decreased to 200 sccm until complete consumption of the carbon source. After 1 h of reaction time, the reactor was cooled down slowly to room temperature in argon ambient space after the synthesis [7].

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