Graphite oxide:: Chemical reduction to graphite and surface modification with primary aliphatic amines and amino acids
Graphite oxide:: Chemical reduction to graphite and surface modification with primary aliphatic amines and amino acids
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DOI：
10.1021/la026525h
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发表时间：
2003-07-22
期刊：
影响因子：
3.9
通讯作者：
Dékány, I
中科院分区：
文献类型：
--
作者：
Bourlinos, AB;Gournis, D;Dékány, I
本文介绍了用硼氢化钠或对苯二酚将氧化石墨（GO）化学还原成石墨，以及用中性脂肪族伯胺和氨基酸对其进行表面改性。用NaBH 4处理GO导致涡轮静压石墨，其在惰性气氛下煅烧时转化为高度有序的石墨碳，而用氢醌还原在软热条件下直接产生结晶石墨。由于GO固体中存在表面暴露的环氧基团，其用中性脂肪族伯胺或含胺分子（氨基酸和氨基硅氧烷）的表面改性容易通过相应的亲核取代反应发生。以这种方式，可以获得有价值的GO衍生物，如分子柱撑GO、在有机溶剂中提供稳定的有机溶胶的有机改性GO或在水中提供稳定的水溶胶并具有直接阳离子交换位点的亲水性GO。本文还介绍了GO的表面改性和化学还原在制备新型石墨基材料中的潜在组合。
The chemical reduction of graphite oxide (GO) to graphite by either NaBH4 or hydroquinone and also its surface modification with neutral, primary aliphatic amines and amino acids are described. Treatment of GO with NaBH4 leads to turbostatic graphite that upon calcination under an inert atmosphere is transformed to highly ordered graphitic carbon, while the reduction with hydroquinone yields directly crystalline graphite under soft thermal conditions. On account of the surface-exposed epoxy groups present in the GO solid, its surface modification with neutral, primary aliphatic amines or amine-containing molecules (amino acids and aminosiloxanes) takes place easily through the corresponding nucleophilic substitution reactions. In this way, valuable GO derivatives can be obtained, like molecular pillared GO, organically modified GO affording in organic solvents stable organosols or hydrophilic GO affording in water stable hydrosols and possessing direct cation exchange sites. The potential combination of surface modification and chemical reduction of GO in producing novel graphite based materials is also presented.