Laser-based texturing of graphene to locally tune electrical potential and surface chemistry

Tripathi, Manoj, King, Alice, Fratta, Giuseppe, Meloni, Manuela, Large, Matthew, Salvage, Jonathan P, Pugno, Nicola Maria and Dalton, Alan B (2018) Laser-based texturing of graphene to locally tune electrical potential and surface chemistry. ACS Omega, 3 (12). pp. 17000-17009. ISSN 2470-1343

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A simple procedure of producing three-dimensional blisters of graphene through irradiation of the visible range laser by Raman spectrometer has been presented. Fabrication of different volumes of the blisters and their characterization were carried out with Raman spectroscopy by tuning the irradiation dose. The produced blisters showed a consistency in altitude and a remarkable change in functionality, adhesion force map and local contact potential difference as compared to untreated monolayer graphene and naturally occurred graphene nanobubbles. Nevertheless, bilayer graphene is unaffected in the applied laser doses. The laser irradiation led to lattice expansion of carbon atoms and introduced oxygenic functional groups with the structural disorder. The internal pressure of the gaseous molecules was evaluated by monitoring the shape of the graphene blisters and nanobubbles. High-resolution Raman mapping showed the impact of laser-affected area and
the defect density (nd) is reported as a function of displacement. Our results reveal ease of applicability of the Raman laser for the imaging and texturing of graphene pointing toward the possibility of the desirable and cost-effective laser writing at the submicron scale by tuning photochemistry of graphene which is pivotal for
numerous applications.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Materials Physics Group
Depositing User: Alice Jackson
Date Deposited: 13 Dec 2018 11:48
Last Modified: 02 Jul 2019 13:34

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Project NameSussex Project NumberFunderFunder Ref
Enabling Excellence - Graphene based nanomaterials four touchscreen technologies: Comprehension, Commerce and CommunicationG1865EUROPEAN UNION642742
European Commission H2020 under theUnsetUnset785219
FET Proactive “Neurofibres"UnsetUnset732344
Italian Ministry of Education, University and ResearchUnsetUnsetL.232/2016