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the 2.5 mg purified carbon nanotubes were suspended in
500 L of 1% HAuCl4¡¤4H2O solution by sonication for 10 min to
make nanotubes dispersed equably. The suspended solution was
then diluted to 25 mL with purified water containing 0.03 M sodium
citrate. 500 L of freshly prepared 0.1 M NaBH4  was added drop-
wise, and kept stirring for 10 min until the color of the solution did
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