Special Issue "Laser-Based Synthesis, Processing, and Characterization of 2D Quantum Materials"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (7 October 2020).

Special Issue Editor

Dr. Masoud Mahjouri-Samani
E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, Auburn University, Auburn, AL 36849, USA
Interests: laser material synthesis; laser processing; laser characterization; real-time optical diagnostics; 2D quantum materials; nanodevices; advanced manufacturing

Special Issue Information

Dear Colleagues,                

Two-dimensional (2D) quantum materials have recently emerged as an exciting class of atomically thin structures that possess extraordinary optical, electrical, and mechanical properties. Motivated by their properties and potential applications, there has been a worldwide interest in research areas ranging from synthesis and processing to characterization and functionality of 2D materials. Interestingly, the strong light interactions with 2D materials not only govern their behavior but can also be used as versatile synthesis, processing, and diagnostic tools to precisely tailor their structures and probe their properties. The spatial and temporal tunability, controlled energy, and power densities of laser beams enable a broad spectrum of applications in the synthesis and processing of 2D quantum materials that are not accessible by other means. This Special Issue of Nanomaterials aims to document recent advances in the application of lasers for the synthesis, processing, and characterization of 2D materials and heterostructures. The format of welcomed articles includes full papers, communications, and reviews. Potential topics include, but are not limited to:

  1. synthesizing of 2D quantum materials and heterostructures by laser-based methods (e.g., PLD, LCVD);
  2. tailoring the structure and properties of 2D materials by laser-based processing approaches (e.g., defect engineering, doping, thinning, direct writing);
  3. integrating 2D materials into various substrates and device structures by laser-based strategies;
  4. investigating the structure and properties of 2D materials by laser-based characterization methods (e.g., Raman, Photoluminescence (PL), ultrafast pump-probe measurements); and
  5. manipulating the charge and spin in 2D materials by lasers.

Dr. Masoud Mahjouri-Samani
Guest Editor

Manuscript Submission Information

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Keywords

  • laser synthesis of 2D materials
  • laser processing of 2D materials
  • laser characterization of 2D materials
  • laser-induced functionality in 2D materials

Published Papers (3 papers)

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Research

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Article
Gas-Phase Formation of Highly Luminescent 2D GaSe Nanoparticle Ensembles in a Nonequilibrium Laser Ablation Process
Nanomaterials 2020, 10(5), 908; https://doi.org/10.3390/nano10050908 - 08 May 2020
Cited by 4 | Viewed by 1583
Abstract
Interest in layered two-dimensional (2D) materials has been escalating rapidly over the past few decades due to their promising optoelectronic and photonic properties emerging from their atomically thin 2D structural confinements. When these 2D materials are further confined in lateral dimensions toward zero-dimensional [...] Read more.
Interest in layered two-dimensional (2D) materials has been escalating rapidly over the past few decades due to their promising optoelectronic and photonic properties emerging from their atomically thin 2D structural confinements. When these 2D materials are further confined in lateral dimensions toward zero-dimensional (0D) structures, 2D nanoparticles and quantum dots with new properties can be formed. Here, we report a nonequilibrium gas-phase synthesis method for the stoichiometric formation of gallium selenide (GaSe) nanoparticles ensembles that can potentially serve as quantum dots. We show that the laser ablation of a target in an argon background gas condenses the laser-generated plume, resulting in the formation of metastable nanoparticles in the gas phase. The deposition of these nanoparticles onto the substrate results in the formation of nanoparticle ensembles, which are then post-processed to crystallize or sinter the nanoparticles. The effects of background gas pressures, in addition to crystallization/sintering temperatures, are systematically studied. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) spectroscopy, and time-correlated single-photon counting (TCSPC) measurements are used to study the correlations between growth parameters, morphology, and optical properties of the fabricated 2D nanoparticle ensembles. Full article
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Review

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Review
Nonlinear Optical Characterization of 2D Materials
Nanomaterials 2020, 10(11), 2263; https://doi.org/10.3390/nano10112263 - 16 Nov 2020
Cited by 3 | Viewed by 1289
Abstract
Characterizing the physical and chemical properties of two-dimensional (2D) materials is of great significance for performance analysis and functional device applications. As a powerful characterization method, nonlinear optics (NLO) spectroscopy has been widely used in the characterization of 2D materials. Here, we summarize [...] Read more.
Characterizing the physical and chemical properties of two-dimensional (2D) materials is of great significance for performance analysis and functional device applications. As a powerful characterization method, nonlinear optics (NLO) spectroscopy has been widely used in the characterization of 2D materials. Here, we summarize the research progress of NLO in 2D materials characterization. First, we introduce the principles of NLO and common detection methods. Second, we introduce the recent research progress on the NLO characterization of several important properties of 2D materials, including the number of layers, crystal orientation, crystal phase, defects, chemical specificity, strain, chemical dynamics, and ultrafast dynamics of excitons and phonons, aiming to provide a comprehensive review on laser-based characterization for exploring 2D material properties. Finally, the future development trends, challenges of advanced equipment construction, and issues of signal modulation are discussed. In particular, we also discuss the machine learning and stimulated Raman scattering (SRS) technologies which are expected to provide promising opportunities for 2D material characterization. Full article
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Review
Energy and Charge Transport in 2D Atomic Layer Materials: Raman-Based Characterization
Nanomaterials 2020, 10(9), 1807; https://doi.org/10.3390/nano10091807 - 10 Sep 2020
Cited by 3 | Viewed by 852
Abstract
As they hold extraordinary mechanical and physical properties, two-dimensional (2D) atomic layer materials, including graphene, transition metal dichalcogenides, and MXenes, have attracted a great deal of attention. The characterization of energy and charge transport in these materials is particularly crucial for their applications. [...] Read more.
As they hold extraordinary mechanical and physical properties, two-dimensional (2D) atomic layer materials, including graphene, transition metal dichalcogenides, and MXenes, have attracted a great deal of attention. The characterization of energy and charge transport in these materials is particularly crucial for their applications. As noncontact methods, Raman-based techniques are widely used in exploring the energy and charge transport in 2D materials. In this review, we explain the principle of Raman-based thermometry in detail. We critically review different Raman-based techniques, which include steady state Raman, time-domain differential Raman, frequency-resolved Raman, and energy transport state-resolved Raman techniques constructed in the frequency domain, space domain, and time domain. Detailed outlooks are provided about Raman-based energy and charge transport in 2D materials and issues that need special attention. Full article
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