Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Giant gap-plasmon tip-enhanced Raman scattering of MoS2 monolayers on Au nanocluster arrays. / Milekhin, Alexander G.; Rahaman, Mahfujur; Rodyakina, Ekaterina E. и др.
в: Nanoscale, Том 10, № 6, 14.02.2018, стр. 2755-2763.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Giant gap-plasmon tip-enhanced Raman scattering of MoS2 monolayers on Au nanocluster arrays
AU - Milekhin, Alexander G.
AU - Rahaman, Mahfujur
AU - Rodyakina, Ekaterina E.
AU - Latyshev, Alexander V.
AU - Dzhagan, Volodymyr M.
AU - Zahn, Dietrich R.T.
N1 - Acknowledgements: The authors gratefully acknowledge financial support from Volkswagen Foundation, MERGE project (TU Chemnitz), State assignment (no. 0306-2016-0017), RFBR (project 18-02-00615_a), and the Ministry of Education and Science of the Russian Federation. The authors are thankful to Mr A. S. Medvedev for Au deposition. SEM studies and fabrication of metal nanostructures were performed using equipment of CCU “Nanostructures” at the Rzhanov Institute of Semiconductor Physics SB RAS.
PY - 2018/2/14
Y1 - 2018/2/14
N2 - In this article, we present the results of a gap-plasmon tip-enhanced Raman scattering study of MoS2 monolayers deposited on a periodic array of Au nanostructures on a silicon substrate forming a two dimensional (2D) crystal/plasmonic heterostructure. We observe a giant Raman enhancement of the phonon modes in the MoS2 monolayer located in the plasmonic gap between the Au tip apex and Au nanoclusters. Tip-enhanced Raman mapping allows us to determine the gap-plasmon field distribution responsible for the formation of hot spots. These hot spots provide an unprecedented giant Raman enhancement of 5.6 × 108 and a spatial resolution as small as 2.3 nm under ambient conditions. Moreover, due to strong hot electron doping in the order of 1.8 × 1013 cm-2, we observe a structural change of MoS2 from the 2H to the 1T phase. Owing to the very good spatial resolution, we are able to spatially resolve those doping sites. To the best of our knowledge, this is the first time reporting of such a phenomenon with nm spatial resolution. Our results will open the perspectives of optical diagnostics with nanometer resolution for many other 2D materials.
AB - In this article, we present the results of a gap-plasmon tip-enhanced Raman scattering study of MoS2 monolayers deposited on a periodic array of Au nanostructures on a silicon substrate forming a two dimensional (2D) crystal/plasmonic heterostructure. We observe a giant Raman enhancement of the phonon modes in the MoS2 monolayer located in the plasmonic gap between the Au tip apex and Au nanoclusters. Tip-enhanced Raman mapping allows us to determine the gap-plasmon field distribution responsible for the formation of hot spots. These hot spots provide an unprecedented giant Raman enhancement of 5.6 × 108 and a spatial resolution as small as 2.3 nm under ambient conditions. Moreover, due to strong hot electron doping in the order of 1.8 × 1013 cm-2, we observe a structural change of MoS2 from the 2H to the 1T phase. Owing to the very good spatial resolution, we are able to spatially resolve those doping sites. To the best of our knowledge, this is the first time reporting of such a phenomenon with nm spatial resolution. Our results will open the perspectives of optical diagnostics with nanometer resolution for many other 2D materials.
KW - TEMPERATURE-DEPENDENT RAMAN
KW - FEW-LAYER MOS2
KW - THERMAL-CONDUCTIVITY
KW - FIELD DISTRIBUTION
KW - LOCALIZED STRAIN
KW - SINGLE-MOLECULE
KW - SPECTROSCOPY
KW - NANOSCALE
KW - MICROSCOPY
KW - PHOTOLUMINESCENCE
UR - http://www.scopus.com/inward/record.url?scp=85041829683&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/e97759b4-ea1e-31c0-bdb6-cfc1e57d4db6/
U2 - 10.1039/c7nr06640f
DO - 10.1039/c7nr06640f
M3 - Article
C2 - 29308796
AN - SCOPUS:85041829683
VL - 10
SP - 2755
EP - 2763
JO - Nanoscale
JF - Nanoscale
SN - 2040-3364
IS - 6
ER -
ID: 10427335