title: π-conjugated carbon radicals at graphene oxide to initiate ultrastrong chemiluminescence.
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 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.
authors: Department of Chemistry, University of Science & Technology of China, Hefei, Anhui 230026 (China); Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031 (China).
authors: Liang
authors: L
authors: Yang
authors: Ruilong
authors: R
authors: Zhang
authors: Bianhua
authors: B
authors: Liu
authors: Jianping
authors: J
authors: Wang
authors: Suhua
authors: S
authors: Wang
authors: Ming-Yong
authors: MY
authors: Han
authors: Zhongping
authors: Z
authors: Zhang
keywords: carbon radicals; chemiluminescence; graphene oxide; radical reactions