Special Issue "Emerging Two-Dimensional Materials: Inspiring Nanotechnologies for Smart Energy Management"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "2D and Carbon Nanomaterials".

Deadline for manuscript submissions: 31 October 2022 | Viewed by 3561

Special Issue Editors

Dr. Alessandro Molle
E-Mail Website
Guest Editor
Consiglio Nazionale delle Ricerche (CNR), Istituto per la Microelettronica e Microsistemi (IMM), Unit of Agrate Brianza, via C. Olivetti 2, I-20864 Agrate Brianza, MB, Italy
Interests: 2D materials; Xenes; transition metal dichalcogenides; epitaxy; nanoelectronics; photonics
Prof. Dr. Emiliano Bonera
E-Mail Website
Guest Editor
Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via Cozzi 55, I-20125 Milano, Italy
Interests: 2D materials; semiconductors; spectroscopy; optoelectronics; microelectronics

Special Issue Information

Dear Colleagues,

Two-dimensional (2D)-layered materials beyond graphene have a number of peculiar and innovative properties that could enable them to inherit the role previously assigned to traditional semiconductors and insulators for nanotechnologies. This could lead to an extreme scaling of the inherent device-size feature, establishing new and exotic physics (e.g., the non-trivial topology) as a game changer for device operation paradigms, and ultimately bringing substantial benefits in the area of energy consumption for next-generation high-tech devices. These materials also hold a lot of promise for so-called energy technologies, such as energy storage, conversion, and harvesting. Among these materials, consideration will be mainly given to the classes of transition metal dichalcogenides, Xenes, MXenes, and their hetero-integration, functionalization, and engineering. The present Special Issue aims to collect significant contributions in the field of the synthesis, characterization, and modeling of 2D materials beyond graphene with a special regard to their potential for energy-saving nanotechnologies. More specifically in this framework, this issue will be open to emerging 2D materials that target topics such as low energy consumption nanoelectronics, devices for light harvesting, and new solutions for energy technologies, including energy storage and conversion devices.

Dr. Alessandro Molle
Prof. Dr. Emiliano Bonera
Guest Editors

Manuscript Submission Information

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Keywords

  • 2D materials beyond graphene: synthesis and modelling
  • transition metal dichalcogenides
  • Xenes: silicene, stanene, phosphorene, borophene, tellurene, etc.
  • MXenes
  • 2D perovskite
  • topological materials
  • Van der Waals heterostructures
  • interface engineering
  • 2D materials characterization and metrology
  • energy technologies: thermoelectrics, batteries and supercapacitors, hydrogen evolution reaction, light harvesting

Published Papers (4 papers)

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Research

Article
Optothermal Raman Spectroscopy of Black Phosphorus on a Gold Substrate
Nanomaterials 2022, 12(9), 1410; https://doi.org/10.3390/nano12091410 - 20 Apr 2022
Viewed by 348
Abstract
With black phosphorus being a promising two-dimensional layered semiconductor for application to electronics and optoelectronics, an issue remains as to how heat diffusion is managed when black phosphorus is interfaced with metals, namely in a typical device heterojunction. We use Raman spectroscopy to [...] Read more.
With black phosphorus being a promising two-dimensional layered semiconductor for application to electronics and optoelectronics, an issue remains as to how heat diffusion is managed when black phosphorus is interfaced with metals, namely in a typical device heterojunction. We use Raman spectroscopy to investigate how the laser-induced heat affects the phonon modes at the interface by comparing the experimental data with a finite element simulation based on a localized heat diffusion. The best convergence is found taking into account an effective interface thermal conductance, thus indicating that heat dissipation at the Au-supported black phosphorus nanosheets is limited by interface effect. Full article
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Article
Ambient Pressure Chemical Vapor Deposition of Flat and Vertically Aligned MoS2 Nanosheets
Nanomaterials 2022, 12(6), 973; https://doi.org/10.3390/nano12060973 - 16 Mar 2022
Viewed by 740
Abstract
Molybdenum disulfide (MoS2) got tremendous attention due to its atomically thin body, rich physics, and high carrier mobility. The controlled synthesis of large area and high crystalline monolayer MoS2 nanosheets on diverse substrates remains a challenge for potential practical applications. [...] Read more.
Molybdenum disulfide (MoS2) got tremendous attention due to its atomically thin body, rich physics, and high carrier mobility. The controlled synthesis of large area and high crystalline monolayer MoS2 nanosheets on diverse substrates remains a challenge for potential practical applications. Synthesizing different structured MoS2 nanosheets with horizontal and vertical orientations with respect to the substrate surface would bring a configurational versatility with benefit for numerous applications, including nanoelectronics, optoelectronics, and energy technologies. Among the proposed methods, ambient pressure chemical vapor deposition (AP-CVD) is a promising way for developing large-scale MoS2 nanosheets because of its high flexibility and facile approach. Here, we show an effective way for synthesizing large-scale horizontally and vertically aligned MoS2 on different substrates such as flat SiO2/Si, pre-patterned SiO2 and conductive substrates (TaN) benefit various direct TMDs production. In particular, we show precise control of CVD optimization for yielding high-quality MoS2 layers by changing growth zone configuration and the process steps. We demonstrated that the influence of configuration variability by local changes of the S to MoO3 precursor positions in the growth zones inside the CVD reactor is a key factor that results in differently oriented MoS2 formation. Finally, we show the layer quality and physical properties of as-grown MoS2 by means of different characterizations: Raman spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) and X-ray photoelectron spectroscopy (XPS). These experimental findings provide a strong pathway for conformally recasting AP-CVD grown MoS2 in many different configurations (i.e., substrate variability) or motifs (i.e., vertical or planar alignment) with potential for flexible electronics, optoelectronics, memories to energy storage devices. Full article
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Article
Efficient Hydrogen Evolution Reaction with Bulk and Nanostructured Mitrofanovite Pt3Te4
Nanomaterials 2022, 12(3), 558; https://doi.org/10.3390/nano12030558 - 06 Feb 2022
Viewed by 676
Abstract
Here, we discuss the key features of electrocatalysis with mitrofanovite (Pt3Te4), a recently discovered mineral with superb performances in hydrogen evolution reaction. Mitrofanovite is a layered topological metal with spin-polarized topological surface states with potential applications for spintronics. However, [...] Read more.
Here, we discuss the key features of electrocatalysis with mitrofanovite (Pt3Te4), a recently discovered mineral with superb performances in hydrogen evolution reaction. Mitrofanovite is a layered topological metal with spin-polarized topological surface states with potential applications for spintronics. However, mitrofanovite is also an exceptional platform for electrocatalysis, with costs of the electrodes suppressed by 47% owing to the partial replacement of Pt with Te. Remarkably, the Tafel slope in nanostructured mitrofanovite is just 33 mV/dec, while reduced mitrofanovite has the same Tafel slope (36 mV/dec) as state-of-the-art electrodes of pure Pt. Mitrofanovite also affords surface stability and robustness to CO poisoning. Accordingly, these findings pave the way for the advent of mitrofanovite for large-scale hydrogen production. Full article
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Article
Ab-Initio Spectroscopic Characterization of Melem-Based Graphitic Carbon Nitride Polymorphs
Nanomaterials 2021, 11(7), 1863; https://doi.org/10.3390/nano11071863 - 20 Jul 2021
Cited by 2 | Viewed by 939
Abstract
Polymeric graphitic carbon nitride (gCN) compounds are promising materials in photoactivated electrocatalysis thanks to their peculiar structure of periodically spaced voids exposing reactive pyridinic N atoms. These are excellent sites for the adsorption of isolated transition metal atoms or small clusters that can [...] Read more.
Polymeric graphitic carbon nitride (gCN) compounds are promising materials in photoactivated electrocatalysis thanks to their peculiar structure of periodically spaced voids exposing reactive pyridinic N atoms. These are excellent sites for the adsorption of isolated transition metal atoms or small clusters that can highly enhance the catalytic properties. However, several polymorphs of gCN can be obtained during synthesis, differing for their structural and electronic properties that ultimately drive their potential as catalysts. The accurate characterization of the obtained material is critical for the correct rationalization of the catalytic results; however, an unambiguous experimental identification of the actual polymer is challenging, especially without any reference spectroscopic features for the assignment. In this work, we optimized several models of melem-based gCN, taking into account different degrees of polymerization and arrangement of the monomers, and we present a thorough computational characterization of their simulated XRD, XPS, and NEXAFS spectroscopic properties, based on state-of-the-art density functional theory calculations. Through this detailed study, we could identify the peculiar fingerprints of each model and correlate them with its structural and/or electronic properties. Theoretical predictions were compared with the experimental data whenever they were available. Full article
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