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Thin Layers Synthesis by Laser Methods
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Thin Layers Synthesis by Laser Methods

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: closed (10 April 2023) | Viewed by 7681

Special Issue Editors

Dr. Cristian Viespe

E-Mail Website
Guest Editor
Laser Department, National Institute of Laser, Plasma and Radiation Physics, 077125 Magurele, Romania
Interests: surface acoustic wave sensors; hydrogen sensors; thin films; pulsed laser deposition; nanomaterials
Special Issues, Collections and Topics in MDPI journals
Dr. Aurelian Marcu

E-Mail Website
Guest Editor
Center for Advanced Laser Technology (CETAL) Department, National Institute of Laser, Plasma and Radiation Physics, 077125 Magurele, Romania
Interests: laser–matter interactions; nanostructures; sensors

Special Issue Information

Dear Colleagues,

With the continuous progress of laser and laser-related technologies, more and more applications are being developed based on laser–matter interaction processes. The development of functional thin material layers with a wide range of applications is just one of these processes. High purity, good property control and a wide range of usable materials are just few arguments for laser technologies development in material science. The possibility of producing functional layers with different properties from the initial bulk material, as well as combinations of different materials in controlled structures with engineered macro properties, known as ‘meta-materials’, extends the applicability of laser-produced layers from biomaterials and sensors to nanotechnologies and optics applications.

This Special Issue aims to publish new and innovative studies in various fields of research, with a common theme of the synthesis of thin layers by laser techniques. It will bring together new trends in laser deposition of thin films,  laser-processed surfaces as well as laser-grown structures, focusing on the application of such layers and laser technologies .

It is our pleasure to invite you to publish in this Special Issue and we look forward to submit your research papers, reviews of the state of the art, or short communications. 

Dr. Cristian Viespe
Dr. Aurelian Marcu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • laser–matter interactions
  • laser ablation
  • thin layers
  • sensors
  • biomaterials
  • optics
  • nanostructures

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Published Papers (4 papers)

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Research

16 pages, 20677 KiB  
Article
GHz—THz Dielectric Properties of Flexible Matrix-Embedded BTO Nanoparticles
by Laura Mihai, Gabriel Caruntu, Aurelian Rotaru, Daniela Caruntu, Vasyl Mykhailovych, Cristina Elena Ciomaga, Nadejda Horchidan, Andrei Stancalie and Aurelian Marcu
Materials 2023, 16(3), 1292; https://doi.org/10.3390/ma16031292 - 2 Feb 2023
Cited by 1 | Viewed by 1615
Abstract
BaTiO3 (BTO) nanoparticles produced by wet chemistry methods were embedded in several types of flexible materials in order to fabricate flexible electronic devices. Starting from the produced nanoparticle dielectric properties, flexible material dielectric properties were tested for high electromagnetic frequencies (30 GHz–2 [...] Read more.
BaTiO3 (BTO) nanoparticles produced by wet chemistry methods were embedded in several types of flexible materials in order to fabricate flexible electronic devices. Starting from the produced nanoparticle dielectric properties, flexible material dielectric properties were tested for high electromagnetic frequencies (30 GHz–2 THz) using time domain spectroscopy. Dielectric performances of the different materials obtained with variable nanoparticle concentrations up to 40 wt.%, embedded in, gelatin, epoxy, and styrene-butadiene were compared at several working temperatures between 0 °C and 120 °C. Beside the general trend of ε′ decrease with temperature and loses increase with the operating frequency, we were able to identify few matrix dependent optimal nanoparticle concentrations. The best composite performances were achieved by the BTO-SBS matrix, with filler concentration of 2 wt.%, where the losses have been of 1.5%, followed by BTO-gelatin matrix, with filler concentration of 40 wt.%, with higher losses percent of almost 10% for THz frequencies. Full article
(This article belongs to the Special Issue Thin Layers Synthesis by Laser Methods)
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15 pages, 4784 KiB  
Article
Laser Processed Hybrid Lead-Free Thin Films for SAW Sensors
by Nicoleta Enea, Valentin Ion, Cristian Viespe, Izabela Constantinoiu, Octavian Buiu, Cosmin Romanitan and Nicu Doinel Scarisoreanu
Materials 2022, 15(23), 8452; https://doi.org/10.3390/ma15238452 - 27 Nov 2022
Viewed by 2233
Abstract
In this study we report the specific interaction of various gases on the modified surface of acoustic wave devices for gas sensor applications, using the piezoelectric ceramic material BaSrTiO3 (BST), with different concentrations of Sr. For enhancing the sensitivity of the sensor, [...] Read more.
In this study we report the specific interaction of various gases on the modified surface of acoustic wave devices for gas sensor applications, using the piezoelectric ceramic material BaSrTiO3 (BST), with different concentrations of Sr. For enhancing the sensitivity of the sensor, the conductive polymer polyethylenimine (PEI) was deposited on top of BST thin films. Thin films of BST were deposited by pulsed laser deposition (PLD) technique and integrated into a test heterostructure with PEI thin films deposited by matrix assisted pulsed laser evaporation (MAPLE) and interdigital Au electrodes (IDT). Further on, the layered heterostructures were incorporated into surface acoustic wave (SAW) devices, in order to measure the frequency response to various gases (N2, CO2 and O2). The frequency responses of the sensors based on thin films of the piezoelectric material deposited at different pressures were compared with layered structures of PEI/BST, in order to observe differences in the frequency shifts between sensors. The SAW tests performed at room temperature revealed different results based on deposition condition (pressure of oxygen and the percent of strontium in BatiO3 structure). Frequency shift responses were obtained for all the tested sensors in the case of a concentration of Sr x = 0.75, for all the analysed gases. The best frequency shifts among all sensors studied was obtained in the case of BST50 polymer sensor for CO2 detection. Full article
(This article belongs to the Special Issue Thin Layers Synthesis by Laser Methods)
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12 pages, 6742 KiB  
Article
SAW Hydrogen Sensors with Pd/SnO2 Layers
by Izabela Constantinoiu, Dana Miu and Cristian Viespe
Materials 2022, 15(22), 8012; https://doi.org/10.3390/ma15228012 - 13 Nov 2022
Cited by 5 | Viewed by 1408
Abstract
Pd/SnO2 bilayers for surface acoustic wave (SAW) sensors were obtained using pulsed laser deposition (PLD). Bilayers were made at several deposition pressures in order to observe the influence of the morphology of the sensitive films on the response of the sensors. The [...] Read more.
Pd/SnO2 bilayers for surface acoustic wave (SAW) sensors were obtained using pulsed laser deposition (PLD). Bilayers were made at several deposition pressures in order to observe the influence of the morphology of the sensitive films on the response of the sensors. The morphological properties were analyzed by scanning electron microscopy (SEM). The SnO2 monolayers were initially deposited on quartz substrates at 100, 400 and 700 mTorr, to observe their morphology at these pressures. The Pd/SnO2 bilayer depositions were made at 100 and 700 mTorr. The sensors realized with these sensitive films were tested at different hydrogen concentrations, in the range of 0.2–2%, at room temperature. In order to establish selectivity, tests for hydrogen, nitrogen, oxygen and carbon dioxide were carried out with SnO2-700, Pd-100/SnO2-700 and Pd-700/SnO2-700 sensors. The sensor with the most porous sensitive film (both films deposited at 700 mTorr) had the best results: a sensitivity of 0.21 Hz/ppm and a limit of detection (LOD) of 142 ppm. The morphology of the SnO2 film is the one that has the major influence on the sensor results, to the detriment of the Pd morphology. The use of Pd as a catalyst for hydrogen improved the sensitivity of the film considerably and the selectivity of the sensors for hydrogen. Full article
(This article belongs to the Special Issue Thin Layers Synthesis by Laser Methods)
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13 pages, 3644 KiB  
Article
Facile Modification of Flexible Electrodes via Laser Transfer
by Florin Andrei, Iulian Boerasu, Mihaela Filipescu and Alexandra Palla-Papavlu
Materials 2022, 15(7), 2488; https://doi.org/10.3390/ma15072488 - 28 Mar 2022
Cited by 2 | Viewed by 1852
Abstract
In this work, we report the modification of commercially available electrochemical electrodes with tin oxide (SnO2) and Pd doped SnO2 (Pd-SnO2) via pulsed laser-induced forward transfer (LIFT). The pulsed light irradiation working as in situ pulsed photo-thermal treatment [...] Read more.
In this work, we report the modification of commercially available electrochemical electrodes with tin oxide (SnO2) and Pd doped SnO2 (Pd-SnO2) via pulsed laser-induced forward transfer (LIFT). The pulsed light irradiation working as in situ pulsed photo-thermal treatment allows for the transfer of SnO2 and Pd-SnO2 from UV absorbing metal complex precursors onto flexible, commercially available screen-printed electrodes. The laser transfer conditions are optimized and the material transferred under different conditions is evaluated morphologically and chemically, and its functionality is tested against the detection of copper ions. For example, by applying laser fluences in the range 100–250 mJ/cm2, the shape and the size of the transferred features ranges from nano-polyhedrons to near corner-grown cubic Pd-SnO2 or near cubic Pd-SnO2. In addition, the EDX analysis is consistent with the XPS findings, i.e., following laser transfer, Pd amounts lower than 0.5% are present in the Pd-SnO2 pixels. First sensing tests were carried out and the transferred Pd-SnO2 proved to enhance the cathodic peak when exposed to Cu(II) ions. This photo-initiated fabrication technology opens a promising way for the low-cost and high-throughput manufacturing of metal oxides as well as for electrodes for heavy metal ion detection. Full article
(This article belongs to the Special Issue Thin Layers Synthesis by Laser Methods)
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