Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 16, Pages 2204-2208Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz300749p
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Funding
- U.S. National Science Foundation [ECCS-0901141]
- University of Georgia
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0901141] Funding Source: National Science Foundation
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Layered heterostructures containing graphene oxide (GO) nanosheets and 20-35 rim bimetal coatings can detach easily from a Si substrate upon sonication-spontaneously forming freestanding, micrometer-sized scrolls with GO on the outside-due to a combination Of material stresses and weak bonding between GO layers. Simple procedures can tune the scroll diameters by varying the thicknesses of the metal films, and these results are confirmed by both experiment and modeling. The selection of materials determines the stresses that control the rolling behavior, as well as the functionality of the structures. In the GO/Ti/Pt system, the Pt is located within the interior of the scrolls, which can become self-propelled microjet engines through O-2 bubbling when suspended in aqueous H2O2.
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