The copper substrate significantly enhances dynamic oxygen migration on graphene oxide

Recently, the undergraduate science and technology team of the School of Physical Sciences and Technology of Yangzhou University found that the copper substrate can significantly reduce the energy barrier of dynamic oxygen migration on graphene oxide (GO), thereby inducing GO to become a dynamic covalent material. Compared with GO without a substrate, the charge transfer between copper 111-sided substrate and GO significantly improves its interfacial properties, reduces the energy barrier of proton shuttle to the level of thermal disturbance, and also induces the generation of new oxygen migration paths. The paper was published in Nanoscale Horizons, a leading journal in nanotechnology under the Royal Society of Chemistry.

In the 2020 study, the team found that when there is adsorption of water molecules, GO can be transformed into an adaptive dynamic covalent material. The epoxy and hydroxyl functional groups on GO can spontaneously disconnect or recombine carbon-oxygen bonds under the mediation of water molecules to achieve dynamic migration of oxygen. This spontaneous kinetic covalent property makes GO show great potential in catalysis, biosensors, biomedicine and other fields. However, in practical applications, because water molecules can have an impact on the normal operation of some devices, especially electronic devices, it is particularly important to explore how to maintain this kinetic property in the absence or lack of water.

In the latest research results, the team found that the copper substrate can effectively reduce the energy barrier of dynamic oxygen migration in the GO interface. The dynamic oxygen transport barrier on the COPPER substrate-supported GO is significantly reduced to less than or comparable to the thermal disturbance level compared to the stand-alone GO. Analysis of charge density differential, Bader charge, and PDOS confirmed that charge transfer between the copper substrate and GO greatly altered the interfacial activity of GO. In addition, lattice matching between the copper substrate and GO induces new oxygen migration pathways that occur at the aromatic intercyclic site, a phenomenon that has never been reported before.

Yan Zihan, author of the paper, said that as a simple and easy-to-implement method, the two-dimensional interface activity can be regulated through the substrate in the future so that the oxygen functional group shows structural adaptability to external stimuli, which also provides scientific guidance for the realization of advanced high-performance sensors, biomedical equipment and electronic devices.

The research work has been funded by the National Natural Science Foundation of China, the Natural Science Foundation of Jiangsu Province, and the National Innovation and Entrepreneurship Training Program for College Students. (Source: Science Network)

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