2D GaN for Highly Reproducible Surface Enhanced Raman Scattering

Surface‐enhanced Raman scattering (SERS) based on 2D semiconductors has been rapidly developed due to their chemical stability and molecule‐specific SERS activity. High signal reproducibility is urgently required towards practical SERS applications. 2D gallium nitride (GaN) with highly polar Ga–N bo...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2021-11, Vol.17 (45), p.e2103442-n/a
Main Authors: Zhao, Shasha, Wang, Huiliu, Niu, Lixin, Xiong, Wenqi, Chen, Yunxu, Zeng, Mengqi, Yuan, Shengjun, Fu, Lei
Format: Article
Language:English
Subjects:
2D materials
Bonding strength
Charge transfer
Density of states
Dipole interactions
Gallium
gallium nitride
Gallium nitrides
Nanotechnology
Raman spectra
Reproducibility
Reproducibility of Results
semiconductor
Semiconductors
Spectrum Analysis, Raman
Stability
Substrates
surface‐enhanced Raman scattering
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Summary:Surface‐enhanced Raman scattering (SERS) based on 2D semiconductors has been rapidly developed due to their chemical stability and molecule‐specific SERS activity. High signal reproducibility is urgently required towards practical SERS applications. 2D gallium nitride (GaN) with highly polar Ga–N bonds enables strong dipole–dipole interactions with the probe molecules, and abundant DOS (density of states) near its Fermi level increases the intermolecular charge transfer probability, making it a suitable SERS substrate. Herein, 2D micrometer‐sized GaN crystals are demonstrated to be sensitive SERS platforms with excellent signal reproducibility and stability. Strong dipole–dipole interaction between the dye molecule and 2D GaN enhances the molecular polarizability. Furthermore, 2D GaN benefits its SERS enhancement by the combination of increased DOS and more efficient charge transfer resonances when compared with its bulk counterpart. 2D GaN crystals grown on liquid metals exhibit excellent surface‐enhanced Raman scattering (SERS) performance both in signal sensitivity, reproducibility and stability. Strong dipole–dipole interaction between 2D GaN and probe molecule, abundant density of states near the Fermi level of 2D GaN and increased charge transfer efficiency give rise to enhanced SERS sensitivity with high signal reproducibility.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202103442