On the Asymmetry in Photo-Induced Motion of Graphene-Oxide Paper

We report on the photo-mobility properties of a free standing large area graphene oxide (GO) paper (GOP). The thickness of the film is ≈20 μm. GOP is made by drop casting an aqueous suspension of GO on a microscope glass slide placed on a hot plate kept at the temperature of 70 °C. The film is peele...

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Bibliographic Details
Published inCoatings (Basel) Vol. 13; no. 8; p. 1310
Main Authors Castagna, Riccardo, Riminesi, Cristiano, Di Donato, Andrea, Castaldo, Rachele, Avolio, Roberto, Montalto, Luigi, Vita, Francesco, Francescangeli, Oriano, Lucchetta, Daniele Eugenio
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2023
Subjects
Asymmetry
Bending
Bends
Electromagnetic absorption
Glass substrates
Graphene
Graphite
Incandescent lamps
Interlayers
Irradiation
Light
Light sources
Morphology
Physical properties
Political aspects
Scanning electron microscopy
Surface roughness
Thermal expansion
Thermal properties
Thickness
X ray imagery
Iran
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Summary:We report on the photo-mobility properties of a free standing large area graphene oxide (GO) paper (GOP). The thickness of the film is ≈20 μm. GOP is made by drop casting an aqueous suspension of GO on a microscope glass slide placed on a hot plate kept at the temperature of 70 °C. The film is peeled-off from the glass substrate and irradiated under different coherent and incoherent light sources. The film bends up to ≈55° when the irradiation is made using a near infra-red (NIR) incoherent incandescent lamp and returns back to the initial position when the NIR lamp is switched-off. The bending mechanism is attributed to the asymmetry of the GOP film obtained during the film formation process. We characterize the film morphology and structure using a Scanning Electron Microscopy (SEM) imaging and X-ray Diffraction (XRD) measurements, respectively. Remarkable differences between the two surfaces of the GOP are evidenced, both on a macroscopic length scale (surface roughness) and on a microscopic one (GO interlayer distance). This asymmetry results in different (negative) thermal expansion coefficients for the two film surfaces and hence in the bending of the film when the film temperature is increased by light absorption.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings13081310