2 g of silica powder (diameters of 2-5 mm) was addedto 0.01 mol % ferrocene-dissolved p-xylene solution (50 mL).The solution was then sonicated by a 1/2-in. titanium tip 200-W probe pulsed 65% at atmospheric pressure and room temperature for 20min. After filtration to remove the silica powder by using HF solution, fiberlike structures remained on the filter membrane as shown in Figure 2a. This morphology is similar to purified SWCNT bundles produced by the laser ablation method.
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