In-situRaman study of laser-induced graphene oxidation
Abstract
We present in-situ Raman measurements of laser-induced oxidation in exfoliated single-layer graphene. By using high-power laser irradiation, we can selectively and in a controlled way initiate the oxidation process and investigate its evolution over time. Our results show that the laser-induced oxidation process is divided into two separate stages, namely tensile strain due to heating and subsequent $p$-type doping due to oxygen binding. We discuss the temporal evolution of the $D/G$-mode ratio during oxidation and explain the unexpected steady decrease of the defect-induced $D$ mode at long irradiation times. Our results provide a deeper understanding of the oxidation process in single-layer graphene and demonstrate the possibility of sub-$\mu$m patterning of graphene by an optical method.
- Publication:
-
Physica Status Solidi B Basic Research
- Pub Date:
- November 2015
- DOI:
- 10.1002/pssb.201552411
- arXiv:
- arXiv:1508.03457
- Bibcode:
- 2015PSSBR.252.2451H
- Keywords:
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- Condensed Matter - Materials Science
- E-Print:
- 5 pages, 4 figures [submitted as IWEPNM 2015 conference publication to pss(b)]