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Title: The Creation of True Two-Dimensional Silicon Carbide

Abstract

This paper reports the successful synthesis of true two-dimensional silicon carbide using a top-down synthesis approach. Theoretical studies have predicted that 2D SiC has a stable planar structure and is a direct band gap semiconducting material. Experimentally, however, the growth of 2D SiC has challenged scientists for decades because bulk silicon carbide is not a van der Waals layered material. Adjacent atoms of SiC bond together via covalent sp3 hybridization, which is much stronger than van der Waals bonding in layered materials. Additionally, bulk SiC exists in more than 250 polytypes, further complicating the synthesis process, and making the selection of the SiC precursor polytype extremely important. This work demonstrates, for the first time, the successful isolation of 2D SiC from hexagonal SiC via a wet exfoliation method. Unlike many other 2D materials such as silicene that suffer from environmental instability, the created 2D SiC nanosheets are environmentally stable, and show no sign of degradation. 2D SiC also shows interesting Raman behavior, different from that of the bulk SiC. Our results suggest a strong correlation between the thickness of the nanosheets and the intensity of the longitudinal optical (LO) Raman mode. Furthermore, the created 2D SiC shows visible-light emission, indicatingmore » its potential applications for light-emitting devices and integrated microelectronics circuits. We anticipate that this work will cause disruptive impact across various technological fields, ranging from optoelectronics and spintronics to electronics and energy applications.« less

Authors:
ORCiD logo [1];  [1];  [2];  [3];  [4]
  1. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Mechanical Engineeirng
  2. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Earth and Planetary Sciences
  3. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemical and Biological Engineering. Center for Microengineered Materials
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1815490
Grant/Contract Number:  
89233218CNA000001; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Nanomaterials
Additional Journal Information:
Journal Volume: 11; Journal Issue: 7; Journal ID: ISSN 2079-4991
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; two-dimensional materials; silicon carbide; siligraphene; semiconductors; graphene

Citation Formats

Chabi, Sakineh, Guler, Zeynel, Brearley, Adrian J., Benavidez, Angelica D., and Luk, Ting Shan. The Creation of True Two-Dimensional Silicon Carbide. United States: N. p., 2021. Web. doi:10.3390/nano11071799.
Chabi, Sakineh, Guler, Zeynel, Brearley, Adrian J., Benavidez, Angelica D., & Luk, Ting Shan. The Creation of True Two-Dimensional Silicon Carbide. United States. https://doi.org/10.3390/nano11071799
Chabi, Sakineh, Guler, Zeynel, Brearley, Adrian J., Benavidez, Angelica D., and Luk, Ting Shan. Thu . "The Creation of True Two-Dimensional Silicon Carbide". United States. https://doi.org/10.3390/nano11071799. https://www.osti.gov/servlets/purl/1815490.
@article{osti_1815490,
title = {The Creation of True Two-Dimensional Silicon Carbide},
author = {Chabi, Sakineh and Guler, Zeynel and Brearley, Adrian J. and Benavidez, Angelica D. and Luk, Ting Shan},
abstractNote = {This paper reports the successful synthesis of true two-dimensional silicon carbide using a top-down synthesis approach. Theoretical studies have predicted that 2D SiC has a stable planar structure and is a direct band gap semiconducting material. Experimentally, however, the growth of 2D SiC has challenged scientists for decades because bulk silicon carbide is not a van der Waals layered material. Adjacent atoms of SiC bond together via covalent sp3 hybridization, which is much stronger than van der Waals bonding in layered materials. Additionally, bulk SiC exists in more than 250 polytypes, further complicating the synthesis process, and making the selection of the SiC precursor polytype extremely important. This work demonstrates, for the first time, the successful isolation of 2D SiC from hexagonal SiC via a wet exfoliation method. Unlike many other 2D materials such as silicene that suffer from environmental instability, the created 2D SiC nanosheets are environmentally stable, and show no sign of degradation. 2D SiC also shows interesting Raman behavior, different from that of the bulk SiC. Our results suggest a strong correlation between the thickness of the nanosheets and the intensity of the longitudinal optical (LO) Raman mode. Furthermore, the created 2D SiC shows visible-light emission, indicating its potential applications for light-emitting devices and integrated microelectronics circuits. We anticipate that this work will cause disruptive impact across various technological fields, ranging from optoelectronics and spintronics to electronics and energy applications.},
doi = {10.3390/nano11071799},
journal = {Nanomaterials},
number = 7,
volume = 11,
place = {United States},
year = {Thu Jul 01 00:00:00 EDT 2021},
month = {Thu Jul 01 00:00:00 EDT 2021}
}

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