π-conjugated carbon radicals at graphene oxide to initiate ultrastrong chemiluminescence.
π-conjugated carbon radicals at graphene oxide to initiate ultrastrong chemiluminescence.
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DOI：
10.1002/anie.201405295
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发表时间：
2014-09
影响因子：
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通讯作者：
Liang Yang;Ruilong Zhang;Bianhua Liu;Jianping Wang;Suhua Wang;M. Han;Zhongpin Zhang
中科院分区：
文献类型：
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作者：
Liang Yang;Ruilong Zhang;Bianhua Liu;Jianping Wang;Suhua Wang;M. Han;Zhongpin Zhang
氧化石墨烯已被广泛应用于各个领域，但其结构和组成仍然没有完全了解。在这里，我们报告说，新鲜制备的氧化石墨烯在其π-网络平面上显示出大量的π-共轭碳自由基，这是由于H2 O2中的羟基自由基与氧化石墨烯的共轭双键的加成反应。π共轭碳自由基能直接引发鲁米诺的可见光化学发光，其强度比辣根过氧化物酶和H_2O_2更强。以前，氧化石墨烯主要被报道为化学发光的猝灭剂。值得注意的是，反应的自由基可以再生，从而能够通过氧化石墨烯的再处理重复引发化学发光。本文报道的结果为氧化石墨烯的结构、性质和应用提供了新的认识。
Graphene oxide has widely been employed in various fields, but its structure and composition has still not been fully understood. Here we report that freshly prepared graphene oxide exhibits a large number of π-conjugated carbon radicals at its π-network plane, which result from the addition reaction of hydroxyl radicals from H2O2 onto the conjugated double bonds of graphene oxide. The π-conjugated carbon radicals can directly initiate the long-lasting visible chemiluminescence of luminol, which is even stronger than that obtained when horseradish peroxidase and H2O2 are used. Previously, graphene oxide was mainly reported to be a quencher of chemiluminescence instead. Remarkably, the reacted radicals can be regenerated, thereby enabling the repetitive initiation of chemiluminescence by re-treatment of graphene oxide. The results reported here provide a new understanding of the structure, properties, and applications of graphene oxide.