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07231210

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[ÇóÖú] Improved Synthesis of Graphene OxideÖÆ±¸Ñõ»¯Ê¯Ä«Ï©£¬¼±Çó ÒÑÓÐ1È˲ÎÓë

Sample Text
ÓÐûÓÐÈËÓÃImproved Synthesis of Graphene Oxide×ö¹ýʵÑé°¡£¬Ðè²»ÐèÒªÓñùÔ¡¼ÓÁϰ¡£¬¼±¼±¼±£¡Íò·Ö¸Ðл£¡
For the improved method, a 9:1 mixture of concentrated H2SO4/H3PO4 (360:40 mL) was added to a mixture of graphite flakes (3.0 g, 1 wt equiv) and KMnO4 (18.0 g, 6 wt equiv), producing a slight exotherm to 35_40 ¡ãC. The reaction was then heated
to 50 ¡ãC and stirred for 12 h. The reaction was cooled to rt and poured onto ice (_400 mL) with 30% H2O2 (3 mL). For workup, the mixture was sifted through a metal U.S. Standard testing sieve (W.S. Tyler, 300 _m) and then filtered through polyester fiber (Carpenter Co.) The filtrate was centrifuged (4000 rpm for 4 h), and the supernatant was decanted away. The remaining solid material was then washed in succession with 200 mL of water, 200 mL of 30% HCl, and 200 mL of ethanol (2_); for each wash, the mixture was sifted through the U.S. Standard testing sieve and then filtered through polyester fiber with the filtrate being centrifuged (4000 rpm for 4 h) and the supernatant decanted away. The material remaining after this extended,
multiple-wash process was coagulated with 200 mL of ether, and the resulting suspension was filtered over a PTFE membrane with a 0.45 _m pore size. The solid obtained on the filter was vacuum-dried overnight at room temperature, obtaining 5.8 g of product.
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