1. π-Conjugated Carbon Radicals at Graphene Oxide to Initiate Ultrastrong Chemiluminescence.
- Author
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Yang, Liang, Zhang, Ruilong, Liu, Bianhua, Wang, Jianping, Wang, Suhua, Han, Ming-Yong, and Zhang, Zhongping
- Subjects
CONJUGATED polymers ,RADICAL ions ,GRAPHENE oxide ,CHEMILUMINESCENCE ,LUMINOL ,PEROXIDASE - Abstract
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 H
2 O2 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 H2 O2 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. [ABSTRACT FROM AUTHOR]- Published
- 2014
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