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Exploring the working mechanism of graphene patterning by magnetic-assisted UV ozonation

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Abstract

When assisted with an inhomogenous vertical magnetic field, ultraviolet (UV) ozonation turns directional and is testified to be applicable to graphene patterning. Using a more cost-effective low-pressure mercury lamp, we further explore the underlying working mechanism by changing oxygen content, introducing reactive ozone or inert nitrogen molecules, and study the lateral under-oxidation impeded Dirac point shifts for a graphene field-effect transistor under UV irradiation. The paramagnetic oxygen molecule X3Σg accelerates toward graphene with the magnetic moment aligned parallel to the magnetic field. The O(3P) atoms, stemming from such a directional oxygen molecule, have a high initial velocity before being further accelerated, and therefore enhance the oxidation capability compared with those from weak diamagnetic ozone molecules. Intermolecular or atomic-molecular collisions between the high-speed oxygen molecules/atoms and the randomly moved weak diamagnetic molecules, including nitrogen and ozone, appear crucial in deteriorating graphene patterning by increasing the lateral under-oxidation. This study may shed light on our understanding of graphene patterning by magnetic-assisted UV ozonation.

Graphical abstract: Exploring the working mechanism of graphene patterning by magnetic-assisted UV ozonation

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Publication details

The article was received on 25 May 2017, accepted on 17 Sep 2017 and first published on 18 Sep 2017


Article type: Paper
DOI: 10.1039/C7CP03523C
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Exploring the working mechanism of graphene patterning by magnetic-assisted UV ozonation

    H. Yue, H. Tao, Y. Wu, S. Su, H. Li, Z. Ni and X. Chen, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP03523C

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