In order to realize the goal of mass production of modification technology, CNTs would be dispersed in gas phase rapidly and then be sprayed to the surface of industrial CF that contain sizing agent. This will increase Interface shear strength (IFSS) of CF from 26MPa before processing to 35MPa maximum (increased about 33.9%). Due to the embedding function that sizing agent has on CNTs, three types of CNTs adhering to the surface of CF are formed. They are complete embedding type (σ1), partial embedding type (σ2) and sufficient exposure type (σ3). This paper analyses the relations between three formations and processing time, and the contribution to IFSS of each type. It is found that the low content of σ1 has a positive effect on IFSS which can reach 6MPa and σ2 has an even stronger effect on the improvement of IFSS compared with σ1on the same concentration. While σ3 has a negative effect on IFSS all the time.

A plasma jet method based on free arc was carried out to disperse carbon nanotubes (CNTs) in gas phase and produce Pt nanoparticles (Pt-NPs) on them at the same time. The plasma jet is generated through the discharge between the cathode composed of CNTs, PtCl4 and ID water and the anode with a hole. Plasma jet prepares the Pt/CNT catalyst by directly spraying. The CNT carrier in the catalyst have good dispersion by SEM images. The mean size of Pt-NPs estimated by TEM images is 3.41nm with the plasma jet method and about 4.77nm with the commercial Pt/C respectively. It was showed that the bulk of Pt-NPs produced by plasma jet is in metal state in the analysis of XPS measurements. Compared with Pt/C, Pt/CNT have roughly equal catalytic activity and higher durability by cyclic voltammetry measurements. On the basis of these properties, the plasma jet method greatly simplifies the preparation process of the catalyst by simultaneously solving carrier dispersion and metal particle preparation.

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