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Metal permeation into multi-layered graphene oxide
Chikako Ogata1, Michio Koinuma1, Kazuto Hatakeyama1
11] Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan [2] JST, CREST, K's Gobancho 6F, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan.
Scientific Reports
|January 14, 2014
Summary
Metal atoms and ions unexpectedly permeate graphene oxide (GO) paper at room temperature, impacting its use in electronic devices. This study reveals the mechanisms of metal permeation into GO bulk, crucial for material stability.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Graphene oxide (GO) is crucial for electronic and electrochemical devices.
- Stable metal/graphene oxide (M/GO) interfaces are essential for device performance.
- Understanding metal permeation into GO is key for material integration.
Purpose of the Study:
- To investigate the chemical and physical properties of M/GO interfaces.
- To observe and understand the permeation behavior of various metals into GO paper at room temperature.
- To elucidate the mechanisms behind metal permeation in GO.
Main Methods:
- Experimental observation of metal permeation into GO paper.
- Analysis of M/GO interfaces at room temperature.
- Investigation of different metals (Cu, Ag, Ni, Au, Pt) under varying conditions.
Main Results:
- Cu, Ag, and Ni permeated GO as ions into the bulk under humid conditions via redox reactions and interlayer diffusion.
- Au and Pt permeated GO as atoms at room temperature, albeit at low rates.
- Metal permeation is attributed to defects and oxygenated groups present in GO paper.
Conclusions:
- Metal permeation into GO paper occurs readily at room temperature, challenging previous assumptions.
- The nature of permeation (ionic vs. atomic) depends on the metal and environmental conditions.
- GO's inherent defects and functional groups significantly influence M/GO interface behavior.
