Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 121, Issue -, Pages 275-286Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2016.08.007
Keywords
Carbon nanotubes; Graphene foam; Polyimide; Laser pyrolysis; Surface patterning
Funding
- Integrated system to improve the quality of doctoral and postdoctoral research in Romania and promotion of the role of science in society - European Social Fund within the Sectorial Operational Program: Human Resources Development [POSDRU/159/1.5/S/133652]
- Romanian National Authority for Scientific Research, CNCS-UEFISCDI [64/2011, 142/2014]
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Attempting a thorough investigation of polyimide pyrolysis via CO2 lasers, we revisit the Laser-Induced Graphene (LIG) method, and determine the optimal operating window for producing pyrolytic nanocarbons. We design an experimental investigation that targets the full parameter space of available laser operating parameters: laser power, scan rate, and step interval. This allows us to produce different morphic groups of nanocarbons with properties depending on their surface morphology by directly controlling surface patterning. We further establish that the base material comprises a network of vertically aligned graphene channels, hereby referred to as graphene foam, thus readdressing the classification of Multi-Layer Graphene (MLG) given in previous research. We show how the laser pyrolysis method can be adapted for the production of carbon nanotubes (CNTs) via repeated pyrolysis of the starting graphene foam over high laser fluence levels. We characterize the pyrolytic nanocarbons via optical and scanning electron microscopy, Raman and UV-vis spectroscopy, surface tension measurements, and thermogravimetric analysis. (C) 2016 Elsevier B.V. All rights reserved.
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