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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 9
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
Total Affiliations: 5
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: 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: 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: 11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication
Grantee:Cleber Renato Mendonça
Support type: Research Projects - Thematic Grants
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