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xiaozufeng

金虫 (正式写手)

[求助] 氧化石墨烯

我是用H法做的氧化石墨烯,用了原料是纳米石墨烯片!为什么做出来的氧化石墨烯在200度氩气环境下不到一个小时就减少了一半的质量,但这个文献            (Thermal stability of graphite oxide
Hae-Kyung Jeong, Yun Pyo Lee, Mei Hua Jin, Eun Sung Kim, Jung Jun Bae, Young Hee Lee)氧化石墨烯在200下两个小时,质量都没啥变化 ,求各位大神赐教啊!还有我对石墨烯不太了解,就是用H法做氧化石墨烯:氧化,然后加H2O2还原,然后洗涤,离心,这样烘干后得到的是单层的嘛氧化石墨烯吗?(原料是纳米石墨烯片,nanosheet)!!!跪求指教!!!!
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xiaozufeng

金虫 (正式写手)

嗯 就是我前面讲的这篇文献:“Preparation of graphene nanosheet. Natural graphite powder (1 g, 99.99%, Sigma- Aldrich) was first stirred in concentrated sulphuric acid (H2SO4, 23 mL) followed by the addition of sodium nitrate (NaNO3, 0.5 g) at room temperature. The stirring lasted for 16h, after that the mixture was cooled down to 0 °C. Potassium permanganate (K2MnO4, 3g) was then added into the solution. After 2 h, a green slurry was formed at around 35 °C,which was then stirred for another 3 h. Then, H2O (46 mL) was slowly added into the solution at around 98 °C. The suspension was kept at this temperature for 30 min before it was further diluted with another addition of water and hydrogen peroxide (H2O2, 140
mL). The suspension was subsequently filtered and washed until reaching a neutral pH, then dried in a vacuum oven at 60 °C to obtain graphite oxide (GO). To obtain graphene, the as-synthesized GO was heated at around 1050 °C in Ar atmosphere for 30 s in a tube furnace”,他这个加入硝酸钠和硫酸后,氧化16h ,随后加入高锰酸钾后又是2h,随后35度又是3h!这条件和你讲的时间延长点有点像,是不是时间长点,其表面的-OH,-COOH会多些!
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18楼2013-10-12 13:48:41
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思凡的沙弥

银虫 (小有名气)

目测不是质量变化,是密度变化
2楼2013-10-05 12:14:16
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houhuihui000

金虫 (正式写手)

【答案】应助回帖

感谢参与,应助指数 +1
原料是纳米石墨烯片,不是石墨吗?
3楼2013-10-05 12:57:15
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zz5672553

禁虫 (小有名气)

感谢参与,应助指数 +1
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4楼2013-10-05 13:44:53
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