Wavelength effect of ns-pulsed radiation on the reduction of graphene oxide

Author(s)

de Lima, B. S. ^[1] ; Bernardi, M. I. B. ^[1] ; Mastelaro, V. R. ^[1]

Affiliation

^[1] Univ Sao Paulo, Sao Carlos Inst Phys, BR-565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Applied Surface Science; v. 506, MAR 15 2020.
• Web of Science Citations: 0

Abstract

Laser-based methods to reduce of Graphene Oxide (GO) have been pointed out as a promising methodology to produce reduced graphene (rGO) due to its potential for scalable production without the use of chemicals and the processing taking place in ambient conditions. Within this context, this study presents the results of a systematic investigation of the reduction of graphene oxide films by means of an Nd:YAG pulsed laser radiation using wavelengths ranging from Ultra-Violet (UV) to Infra-Red (IR). Our results demonstrated that the reduction carried out using infrared (lambda = 1064 nm) and visible radiation (lambda = 532 nm) yield higher sp(3)-sp(2) conversion as a consequence of photothermal reduction. On the other hand, UV radiation is more efficient in removing oxygen groups due to an enhanced photochemical effect. Furthermore, our results demonstrate that rGO films with C/O ratio greater than 100 can be produced if both photochemical and photothermal effects are present in the reduction process. (AU)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 18/07517-2 - Graphene and metal oxides composites: application as toxic gas sensors
• Grantee: Bruno Sanches de Lima
• Support Opportunities: Scholarships in Brazil - Post-Doctoral