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Nanomaterials
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Optical Properties and Applications of 2D Nanostructures
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Optical Properties and Applications of 2D Nanostructures

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanophotonics Materials and Devices".

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 3194

Special Issue Editor

Dr. Zhinan Guo

E-Mail Website
Guest Editor
Institute of Microscale Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronic Science and Technology, Shenzhen University, Shenzhen 518060, China
Interests: semiconductor nanocrystals; photodetectors; optoelectronic and photonic nanosheets

Special Issue Information

Dear Colleagues,

Since the discovery of graphene in 2004, two-dimensional (2D) materials have already attracted much attention. Due to their unique structure and special properties, 2D materials hold great promise for applications in biomedicine, energy storage, optoelectronic devices, etc. . In particular, including insulators (e.g., BN), semiconductors (e.g., transition metal dichalcogenides (TMDCs), tellurene, PtSe2, black phosphorus (BP)), semimetals (e.g., MoTe2), topological insulators (e.g., Bi2Se3) and metals (1T-TaS2), 2D materials and their hybrid systems exhibit intriguing optical properties, such as strong light-matter interaction, wide electromagnetic spectral response range, adjustable photoelectric performance and high photothermal conversion efficiency, making them expected to have a disruptive impact in the fields of photodetection, solar cells, optoelectronic integration, photothermal therapy, etc. In order to intensively display and discuss the latest research results and research progress of 2D materials in optical properties and their applications, Nanomaterials launched the topic “Optical Properties and Applications of 2D Nanostructures” to promote academic exchanges and dissemination and expand the influence of scientific research results. Please submit your related research here.

Dr. Zhinan Guo
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. Nanomaterials 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 2900 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

  • two-dimensional materials
  • heterojunction
  • optical
  • photodetection
  • energy storage and conversion

Published Papers (2 papers)

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Research

7 pages, 2311 KiB  
Article
Low-Threshold Optical Bistability in the Graphene-Oxide Integrated Asymmetric Nanocavity at Visible Light Frequencies
by Zeqiang Wang, Boyuan Cai, Zhengfen Wan, Yunyue Zhang, Xiaoguang Ma, Min Gu and Qiming Zhang
Nanomaterials 2022, 12(7), 1117; https://doi.org/10.3390/nano12071117 - 28 Mar 2022
Cited by 5 | Viewed by 1571
Abstract
Here, we propose an optical bistable device structure with a few layers of graphene oxide integrated in the metal-dielectric-metal based asymmetric nanocavity. Through the light confinement in the nanocavity, the third order nonlinear absorption of graphene oxide can be significantly enhanced, which experimentally [...] Read more.
Here, we propose an optical bistable device structure with a few layers of graphene oxide integrated in the metal-dielectric-metal based asymmetric nanocavity. Through the light confinement in the nanocavity, the third order nonlinear absorption of graphene oxide can be significantly enhanced, which experimentally delivers low-threshold optical bistability at the visible wavelength of 532 nm with only 267 KW/cm2 intensity. In addition, the switching threshold can be further reduced via increasing the graphene oxide thickness, hence paving a new way for achieving tunable optical bistable devices at visible light frequencies. Full article
(This article belongs to the Special Issue Optical Properties and Applications of 2D Nanostructures)
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12 pages, 3047 KiB  
Article
Direct Detection of Inhomogeneity in CVD-Grown 2D TMD Materials via K-Means Clustering Raman Analysis
by Hang Xin, Jingyun Zhang, Cuihong Yang and Yunyun Chen
Nanomaterials 2022, 12(3), 414; https://doi.org/10.3390/nano12030414 - 27 Jan 2022
Cited by 5 | Viewed by 2059
Abstract
It is known that complex growth environments often induce inhomogeneity in two-dimensional (2D) materials and significantly restrict their applications. In this paper, we proposed an efficient method to analyze the inhomogeneity of 2D materials by combination of Raman spectroscopy and unsupervised k-means clustering [...] Read more.
It is known that complex growth environments often induce inhomogeneity in two-dimensional (2D) materials and significantly restrict their applications. In this paper, we proposed an efficient method to analyze the inhomogeneity of 2D materials by combination of Raman spectroscopy and unsupervised k-means clustering analysis. Taking advantage of k-means analysis, it can provide not only the characteristic Raman spectrum for each cluster but also the cluster spatial maps. It has been demonstrated that inhomogeneities and their spatial distributions are simultaneously revealed in all CVD-grown MoS2, WS2 and WSe2 samples. Uniform p-type doping and varied tensile strain were found in polycrystalline monolayer MoS2 from the grain boundary and edges to the grain center (single crystal). The bilayer MoS2 with AA and AB stacking are shown to have relatively uniform p-doping but a gradual increase of compressive strain from center to the periphery. Irregular distribution of 2LA(M)/E2g1 mode in WS2 and E2g1 mode in WSe2 is revealed due to defect and strain, respectively. All the inhomogeneity could be directly characterized in color-coded Raman imaging with correlated characteristic spectra. Moreover, the influence of strain and doping in the MoS2 can be well decoupled and be spatially verified by correlating with the clustered maps. Our k-means clustering Raman analysis can dramatically simplify the inhomogeneity analysis for large Raman data in 2D materials, paving the way towards direct evaluation for high quality 2D materials. Full article
(This article belongs to the Special Issue Optical Properties and Applications of 2D Nanostructures)
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