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[求助]
超臨界法合成石墨烯 已有1人參與
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| 前幾天看到文獻(xiàn)介紹說(shuō)可以用超臨界法從石墨直接制備石墨烯,覺(jué)得這個(gè)方法很簡(jiǎn)單,想嘗試下,但不知道這對(duì)設(shè)備什么的有沒(méi)有特殊要求?想求助各位大師幫忙解答下,并希望能對(duì)機(jī)理進(jìn)行簡(jiǎn)單描述。下附英文實(shí)驗(yàn)方法原文。Commercial powdered natural graphite was used as our starting material. The commercial graphite has a particle size of ~70 μm with a purity of 99.99995% and a density of 2.25 g/cm3. One gram of graphite was placed in a high-pressure vessel with a heater and a temperature controller. CO2 was then added into the vessel until the pressure reached 100 b. Heat was applied to the vessel so that the temperature of the vesselwas kept at 45 °C. The graphitewas immersed in the supercritical fluid for 30 min. |
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http://pan.baidu.com/disk/home?這是我看到的那篇介紹超臨界法制備石墨烯的文獻(xiàn),麻煩幫忙解答下。謝咯!我的疑惑是為什么此種方法得到的不是膨脹石墨而是石墨烯。 |

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原理就是這段話。 During the 30-min immersion in the supercritical fluid, the supercritical CO2 diffused in between the layers of graphite due to its low viscosity, high diffusivity, and small molecule size. The CO2-intercalated graphite was forced to exfoliate or delaminate by the expansion of the supercritical CO2 disposed interstitially between the layers upon rapid depressurization of the vessel. 但是,這篇論文的結(jié)果值得商榷。 首先,二氧化碳真的能夠插入到石墨層之間,且減壓后將石墨各層之間剝離嗎; 另外,如果真的可以,那么就可以大量制備了,而且得到的還是高結(jié)晶性的石墨烯,結(jié)果只發(fā)在了Materials Letters上。依我看,nature,science也行了。所以。。。 |


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