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Micromachines 2017, 8(10), 307; https://doi.org/10.3390/mi8100307

Controlled Solvent-Free Formation of Embedded PDMS-Derived Carbon Nanodomains with Tunable Fluorescence Using Selective Laser Ablation with A Low-Power CD Laser

1
Laboratorio Nacional de Soluciones Biomiméticas para Diagnósticoy Terapia, Facultad de Ciencias, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Circuito Interior S/N, Delegación Coyoacán, Ciudad Universitaria, Mexico City C.P. 04510, Mexico
2
Departamento de Física Facultad de Ciencias, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Circuito Exterior S/N, Delegación Coyoacán, Ciudad Universitaria, Mexico City C.P. 04510, Mexico
*
Author to whom correspondence should be addressed.
Received: 16 September 2017 / Revised: 30 September 2017 / Accepted: 4 October 2017 / Published: 17 October 2017
(This article belongs to the Special Issue Carbon Based Materials for MEMS/NEMS)
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Abstract

We present a study of the application of a single-step and solvent-free laser-based strategy to control the formation of polymer-derived fluorescent carbon nanodomains embedded in poly-dimethylsiloxane (PDMS) microchannels. A low-power, laser-induced microplasma was used to produce a localised combustion of a PDMS surface and confine nanocarbon byproducts within the exposed microregions. Patterns with on-demand geometries were achieved under dry environmental conditions thanks to a low-cost 3-axis CD-DVD platform motorised in a selective laser ablation fashion. The high temperature required for combustion of PDMS was achieved locally by strongly focusing the laser spot on the desired areas, and the need for high-power laser was bypassed by coating the surface with an absorbing carbon additive layer, hence making the etching of a transparent material possible. The simple and repeatable fabrication process and the spectroscopic characterisation of resulting fluorescent microregions are reported. In situ Raman and fluorescence spectroscopy were used to identify the nature of the nanoclusters left inside the modified areas and their fluorescence spectra as a function of excitation wavelength. Interestingly, the carbon nanodomains left inside the etched micropatterns showed a strong dependency on the additive materials and laser energy that were used to achieve the incandescence and etch microchannels on the surface of the polymer. This dependence on the lasing conditions indicates that our cost-effective laser ablation technique may be used to tune the nature of the polymer-derived nanocarbons, useful for photonics applications in transparent silicones in a rapid-prototyping fashion. View Full-Text
Keywords: carbon nanodomains; fluorescence; laser ablation; poly-dimethylsiloxane (PDMS) carbon nanodomains; fluorescence; laser ablation; poly-dimethylsiloxane (PDMS)
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González-Vázquez, M.J.; Hautefeuille, M. Controlled Solvent-Free Formation of Embedded PDMS-Derived Carbon Nanodomains with Tunable Fluorescence Using Selective Laser Ablation with A Low-Power CD Laser. Micromachines 2017, 8, 307.

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