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Ultrathin Two-dimensional (2D) Nanomaterials
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Ultrathin Two-dimensional (2D) Nanomaterials

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (30 June 2018) | Viewed by 25130

Special Issue Editor

Prof. Dr. Elisabetta Comini

E-Mail Website
Guest Editor
Sensor Lab, Department of Information Engineering, University of Brescia and CNR INO, Via Valotti 9, 25133 Brescia, Italy
Interests: metal oxides; nanowires; chemical sensors; gas sensors; heterostructures; functional materials; material synthesis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Over the last few decades, materials researchers have focused their attention and research efforts on developing new materials for eventual exploitation in real applications.

Ultrathin two-dimensional (2D) nanomaterials are receiving increasing interest after the discovery of exfoliated graphene from graphite in 2004. These 2D nanomaterials, like graphene, are crystalline materials consisting of a single layer of atoms. They have some unique properties that strongly differ from zero- (0D, like nanoparticles) or one- (1D, nanowires and nanotubes) dimensional materials.

Graphene is an ideal, single-atom-thick, crystalline carbon film exhibiting various unprecedented properties, such as high carrier mobility, large theoretical specific surface area, and excellent optical transparency. Their electronic structure is among the manifold attractive features of ultrathin 2D nanomaterials. It is highly sensitive to chemical modification, and in particular to doping and adsorption of other molecules or materials. This can be exploited in devices for applications such as photovoltaics, electrodes and sensors.

This Special Issue mainly focuses on presenting a comprehensive overview of the new developments in the field, specifically with regard to the promising approaches that will contribute to the further development of this field. Recent advances in science and technology will be addressed, including fabrication techniques, growth mechanisms of novel high-performance materials with improved properties, and advanced processing technologies.

We invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Prof. Dr. Elisabetta Comini
Guest Editor

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

  • 2D allotropes
  • Transition metal di-chalcogenides
  • 2D compounds
  • 2D organic materials
  • Synthesis and characterization of 2D materials
  • Graphene
  • 2D crystals
  • Mono-layer materials

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Published Papers (3 papers)

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Research

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3368 KiB  
Article
Synthesis of Au NP@MoS2 Quantum Dots Core@Shell Nanocomposites for SERS Bio-Analysis and Label-Free Bio-Imaging
by Xixi Fei, Zhiming Liu, Yuqing Hou, Yi Li, Guangcun Yang, Chengkang Su, Zhen Wang, Huiqing Zhong, Zhengfei Zhuang and Zhouyi Guo
Materials 2017, 10(6), 650; https://doi.org/10.3390/ma10060650 - 13 Jun 2017
Cited by 29 | Viewed by 8248
Abstract
In this work, we report a facile method using MoS2 quantum dots (QDs) as reducers to directly react with HAuCl4 for the synthesis of Au nanoparticle@MoS2 quantum dots (Au NP@MoS2 QDs) core@shell nanocomposites with an ultrathin shell of ca. [...] Read more.
In this work, we report a facile method using MoS2 quantum dots (QDs) as reducers to directly react with HAuCl4 for the synthesis of Au nanoparticle@MoS2 quantum dots (Au NP@MoS2 QDs) core@shell nanocomposites with an ultrathin shell of ca. 1 nm. The prepared Au NP@MoS2 QDs reveal high surface enhanced Raman scattering (SERS) performance regarding sensitivity as well as the satisfactory SERS reproducibility and stability. The limit of detection of the hybrids for crystal violet can reach 0.5 nM with a reasonable linear response range from 0.5 μM to 0.5 nM (R2 ≈ 0.974). Furthermore, the near-infrared SERS detection based on Au NP@MoS2 QDs in living cells is achieved with distinct Raman signals which are clearly assigned to the various cellular components. Meanwhile, the distinguishable SERS images are acquired from the 4T1 cells with the incubation of Au NP@MoS2 QDs. Consequently, the straightforward strategy of using Au NP@MoS2 QDs exhibits great potential as a superior SERS substrate for chemical and biological detection as well as bio-imaging. Full article
(This article belongs to the Special Issue Ultrathin Two-dimensional (2D) Nanomaterials)
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17557 KiB  
Article
Solid-State Method Synthesis of SnO2-Decorated g-C3N4 Nanocomposites with Enhanced Gas-Sensing Property to Ethanol
by Jianliang Cao, Cong Qin, Yan Wang, Huoli Zhang, Guang Sun and Zhanying Zhang
Materials 2017, 10(6), 604; https://doi.org/10.3390/ma10060604 - 31 May 2017
Cited by 107 | Viewed by 8455
Abstract
SnO2/graphitic carbon nitride (g-C3N4) composites were synthesized via a facile solid-state method by using SnCl4·5H2O and urea as the precursor. The structure and morphology of the as-synthesized composites were characterized by the techniques [...] Read more.
SnO2/graphitic carbon nitride (g-C3N4) composites were synthesized via a facile solid-state method by using SnCl4·5H2O and urea as the precursor. The structure and morphology of the as-synthesized composites were characterized by the techniques of X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), thermogravimetry-differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), and N2 sorption. The results indicated that the composites possessed a two-dimensional (2-D) structure, and the SnO2 nanoparticles were highly dispersed on the surface of the g-C3N4 nanosheets. The gas-sensing performance of the samples to ethanol was tested, and the SnO2/g-C3N4 nanocomposite-based sensor exhibited admirable properties. The response value (Ra/Rg) of the SnO2/g-C3N4 nanocomposite with 10 wt % 2-D g-C3N4 content-based sensor to 500 ppm of ethanol was 550 at 300 °C. However, the response value of pure SnO2 was only 320. The high surface area of SnO2/g-C3N4-10 (140 m2·g−1) and the interaction between 2-D g-C3N4 and SnO2 could strongly affect the gas-sensing property. Full article
(This article belongs to the Special Issue Ultrathin Two-dimensional (2D) Nanomaterials)
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Review

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9999 KiB  
Review
Molybdenum Dichalcogenides for Environmental Chemical Sensing
by Dario Zappa
Materials 2017, 10(12), 1418; https://doi.org/10.3390/ma10121418 - 12 Dec 2017
Cited by 29 | Viewed by 7105
Abstract
2D transition metal dichalcogenides are attracting a strong interest following the popularity of graphene and other carbon-based materials. In the field of chemical sensors, they offer some interesting features that could potentially overcome the limitation of graphene and metal oxides, such as the [...] Read more.
2D transition metal dichalcogenides are attracting a strong interest following the popularity of graphene and other carbon-based materials. In the field of chemical sensors, they offer some interesting features that could potentially overcome the limitation of graphene and metal oxides, such as the possibility of operating at room temperature. Molybdenum-based dichalcogenides in particular are among the most studied materials, thanks to their facile preparation techniques and promising performances. The present review summarizes the advances in the exploitation of these MoX2 materials as chemical sensors for the detection of typical environmental pollutants, such as NO2, NH3, CO and volatile organic compounds. Full article
(This article belongs to the Special Issue Ultrathin Two-dimensional (2D) Nanomaterials)
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