Femtosecond laser micromachining of polylactic acid/graphene composites for designing interdigitated microelectrodes for sensor applications

Author(s)

Paula, Kelly T. ^[1] ; Gaal, Gabriel ^[2] ; Almeida, G. F. B. ^[1] ; Andrade, M. B. ^[1] ; Facure, Murilo H. M. ^{[3, 4]} ; Correa, Daniel S. ^{[3, 4]} ; Riul Jr, Antonio ; Rodrigues, Varlei ^[5] ; Mendonca, Cleber R. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

^[3] Embrapa Instrumentacao, Nanotechnol Natl Lab Agr LNNA, BR-13560970 Campinas, SP - Brazil

^[4] Fed Univ Sao Carlos UFSCar, Ctr Exact Sci & Technol, PPGQ, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

^[5] Riul Jr, Jr., Antonio, Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

• Document type: Journal article
• Source: OPTICS AND LASER TECHNOLOGY; v. 101, p. 74-79, MAY 2018.
• Web of Science Citations: 8

Abstract

There is an increasing interest in the last years towards electronic applications of graphene-based materials and devices Fabricated from patterning techniques. with the ultimate goal of high performance and temporal resolution. Laser micromachining using femtosecond pulses is an attractive methodology to integrate graphene-based materials into functional devices as it allows changes to the focal volume with a submicrometer spatial resolution due to the efficient nonlinear nature of the absorption, yielding rapid prototyping for innovative applications. We present here the patterning of PLA-graphene films spin coated on a glass substrate using a fs-laser at moderate pulse energies to fabricate interdigitated electrodes having a minimum spatial resolution of 5 pm. Raman spectroscopy of the PLA-graphene films indicated the presence of multilayered graphene fibers. Subsequently, the PLA-graphene films were micromachined using a femtosecond laser oscillator delivering 50-fs pulses and 800 nm, where the pulse energy and scanning speed was varied in order to determine the optimum irradiation parameters (16 of and 100 mu m/s) to the fabrication of microstructures. The micromachined patterns were characterized by optical microscopy and submitted to electrical measurements in liquid samples, clearly distinguishing all tastes tested. Our results confirm the femtosecond laser micromachining technique as an interesting approach to efficiently pattern PLA-graphene filaments with high precision and minimal mechanical defects, allowing the easy fabrication of interdigitated structures and an alternative method to those produced by conventional photolithography. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 14/16789-5 - Hybrid nanostructured materials based on conjugated polymers and metallic nanoparticles for sensor applications
• Grantee: Daniel Souza Corrêa
• Support type: Regular Research Grants
• FAPESP's process: 15/13140-0 - Production and characterization of hybrid materials based on graphene/conductive polymer and applications in electronic tongue type chemical sensors
• Grantee: Murilo Henrique Moreira Facure
• Support type: Scholarships in Brazil - Master
• FAPESP's process: 13/03487-8 - Center of characterization of new mineral species: Raman spectroscopy, electron microprobe and X-ray and neutron diffraction
• Grantee: Marcelo Barbosa de Andrade
• Support type: Research Grants - Young Investigators Grants
• FAPESP's process: 11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication
• Grantee: Cleber Renato Mendonça
• Support type: Research Projects - Thematic Grants