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zzlcsu

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8楼: Originally posted by melodybusy at 2012-12-20 20:33:21
我超声后就是黑色的胶体状溶液啊！是0.1g/ml的浓度...

是偏棕色的，越稀的话应该会偏红一点吧，0.1mg/ml还沉的话应该就是氧化剥离没做好
The graphene oxide used in this work was prepared from natural graphite  (Alfa Aesar) by using a modified Hummers method.
5 g of graphite and 2.5 g  of sodium nitrate (NaNO3) were mixed with 160 mL of concentrated sulfuric acid (H2SO4, 95%, Sigma–Aldrich) in a 500 mL flask. After the mixture was stirred for 30 min in an ice bath, 18 g of potassium permanganate (KMnO4) was
added under vigorous stirring. The rate of addition was carefully controlled to keep the reaction temperature lower than 20 °C. After th e mixture was continuously stirred at room temperature（我这里用的是40度水浴，温度不能过高，这里面全是七氧化二锰，50度剧烈分解，很危险的。后面里面会变得非常粘稠，和泥浆差不多，所以磁力搅拌一定要给力） overnight, 150 mL of deionized  (DI) water was slowly added under vigorous agitation. After the diluted suspension was stirred for one day, 50 mL of 30 wt.% H2O2 was added to the mixture. Finally, the mixture wa s washed by rinsing and centrifugation with 5 wt.% HCl and then DI water for several times. （水洗会比较难离心，酸洗基本3000转就可以，水洗到后面我是20000转5分钟都不能离心的彻底） Chemical exfoliation of thus-obtained graphite oxide was carried out in an ultrasonic bath. After ultrasonication, a GO colloid was obtained.
后者用improve hummer method，效果也不错

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11楼2012-12-20 21:38:43

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dongwei87

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感谢参与，应助指数 +1

你这是制作的不均匀。方法是不是有问题！

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12楼2012-12-21 08:12:14

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melodybusy

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11楼: Originally posted by zzlcsu at 2012-12-20 21:38:43
是偏棕色的，越稀的话应该会偏红一点吧，0.1mg/ml还沉的话应该就是氧化剥离没做好
The graphene oxide used in this work was prepared from natural graphite (Alfa Aesar) by using a modified Hummers method ...

氧化的时候只加了20ml双氧水，师姐做过的呀，她都毕业了，我们都是筵席她的方法来的

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13楼2012-12-21 09:52:25

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