Inexpensive laser-induced surface modification in bismuth thin films

Contreras, Albert Malet; Hautefeuille, Mathieu; García, Álvaro; Olea-Mejía, Oscar; López, Marco A.

doi:10.1016/j.apsusc.2014.11.053

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…A study of the influence on cells transdifferentiation and behavior of laser parameters, geometry and dimensions of our scaffold as well as substrate material Young's modulus is currently undergoing in our group. As reported elsewhere 3,9 , when PDMS direct laser etching is achieved with our process, carbon nanodomains are left inside the resulting channels. Depending on laser power density, carbon nanotubes or nanographite may be found at the bottom of the channels, embedded below the surface.…”

Section: Preliminary Resultsmentioning

confidence: 95%

“…The experimental setup used in this work is similar to previously reported work 3 . It consists of a low-cost laser etching platform based on the optical pickup head of a commercial CD-DVD system mounted on a 3-axis translation stage actuated by microstepper motors for precise in-plane and vertical (laser focussing) displacements.…”

Section: Experimental Methodsmentioning

confidence: 93%

“…Here we present an alternative to enable the construction of biochips with rapid prototyping. The principle of our method is based on a custom-made laser setup with computer-numerical-control (CNC), to enable etching any desired substrate surface with a low-power laser 3 . It is indeed possible to achieve ablation in a localized fashion and with micron-scale features using simple on-demand designs, made with any picture editor software, thanks to a process that has been developed for this purpose.…”

Section: Introductionmentioning

confidence: 99%

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Rapid prototyping of integrated biochips for on-demand 3D cell culture

et al. 2015

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The future of research in biology and medicine depends on modular tridimensional cell culture platforms with suitable ondemand geometries that can imitate any cell-specific environment with micron-size features. A high level of control of physico-chemical properties of the substrates is critical, as mechanotransduction signals are passed to the cells that sense their environment. The possibility to pattern nanoscale geometries on chip are also leading to better culture results. All these biomimicry parameters influence the cells phenotype, structure and behavior and are now opening new perspectives in 3D cell culturing for basic biology, medicine and drug testing applications. However, this growing need for on-demand 3D platforms is currently limited by two factors: the specificity of the commercial biochips is not suitable for many cell types and the high cost of technology used to design and fabricate custom-made substrates. In this work, we present the application of a simple, low-cost alternative technique enabling the rapid fabrication of ondemand, custom-made biochips for cell culture with micron-scale resolution. We developed a process that enables the use of low-power, low-cost lasers to etch on-demand micropatterns in transparent biopolymers, circumventing the need for high power lasers or photolithography. We also report the integration of embedded electronics for in situ monitoring or actuation and microchannels on chip. We also succeeded in producing localized carbon nanodomains that are enhancing cell cultures and allowing regionalization in 3D cell culture platforms.

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Section: Preliminary Resultsmentioning

confidence: 95%

Section: Experimental Methodsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Rapid prototyping of integrated biochips for on-demand 3D cell culture

et al. 2015

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“…Bismuth thin films have been irradiated with CW laser to obtain Bi 2 O 3 [2,23,24]. A. Reyes et al recently demonstrated low power laser-induced microbumps on a bismuth thin film by using microsecond laser pulses [25]. In a previous work, we have reported a study of laser-induced bismuth oxidation under ns pulsed laser irradiation at 1064 nm; the threshold (number of pulses) for initiating the oxidation process was well determined [26].…”

Section: Introductionmentioning

confidence: 94%

Laser-induced periodic surface structures on bismuth thin films with ns laser pulses below ablation threshold

Reyes-Contreras¹,

Camacho‐López²,

Olea-Mejía³

et al. 2017

Opt. Mater. Express

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We demonstrate the formation of laser-induced periodic surface structures (LIPSS) in bismuth (Bi) thin films by irradiation with nanosecond laser pulses. We report on the formation and the destruction of the LIPSS as a result of the delivered number of pulses; both the formation and destruction threshold were very well determined. Results show that the obtained LIPSS are perpendicular to the laser polarization, and their ripple periodicity is on the order of the irradiation wavelength. Although all the irradiation experiments were done in ambient air, Raman micro-spectroscopy indicates that the LIPSS are constituted by metallic bismuth, i. e. the LIPSS formation is oxidation free.

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“…Laser-induced oxidation by CW and pulsed laser irradiation has been reported in Bi thin films by various research groups [1][2][3][4]. Additionally, laser-induced surface modification without oxidation has been studied by using laser pulses [5][6]. Recently, the LIPSS formation in Bi thin films grown by DC-sputtering technique was reported for the first time.…”

Section: Introductionmentioning

confidence: 99%

Study of LIPSS formation on bismuth thin films deposited by Pulsed Laser Deposition

Reyes-Contreras

López

Romero-Salazar

et al. 2018

Superficies y Vacio

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In this work, we report the fabrication of bismuth thin films on glass substrates by Pulsed Laser Deposition. A focused beam of a Nd:YAG laser (9 ns, 10 Hz, 1064 and 532 nm) was utilized to carry out the ablation of a high purity Bi target. The per pulse laser fluence was varied between 0.95 and 1.35 J/cm2, depending on the laser wavelength used. The deposits were characterized by SEM and XRD to analyze the surface morphology of thin films and their crystalline structure, respectively. The SEM micrographs showed differences in roughness, which increased with the laser wavelength. The diffractograms revealed the formation of Bi thin films with a polycrystalline structure or with a preferential orientation, depending on the mean kinetic energy of the plasma ions. The as deposited bismuth thin films were irradiated with a non-focused laser beam at low energies below the ablation threshold. In the laser treated area, it could be observed the formation of periodic structures, known as LIPSS (laser induced periodic surface structures). Depending on the crystallographic structure of the irradiated film, the formed LIPSS showed different characteristics, such as width and shape.

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Inexpensive laser-induced surface modification in bismuth thin films

Cited by 5 publications

References 24 publications

Rapid prototyping of integrated biochips for on-demand 3D cell culture

Rapid prototyping of integrated biochips for on-demand 3D cell culture

Laser-induced periodic surface structures on bismuth thin films with ns laser pulses below ablation threshold

Study of LIPSS formation on bismuth thin films deposited by Pulsed Laser Deposition

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