Surface-enhanced Raman scattering of monolayer transition metal dichalcogenides on Ag nanorod arrays

Liqin Su; Liqin Su; Layne Bradley; Yiling Yu; Yifei Yu; Linyou Cao; Yiping Zhao; Yong Zhang

doi:10.1364/OL.44.005493

Optics Letters
Vol. 44,
Issue 22,
pp. 5493-5496
(2019)
•https://doi.org/10.1364/OL.44.005493

Surface-enhanced Raman scattering of monolayer transition metal dichalcogenides on Ag nanorod arrays

Liqin Su, Layne Bradley, Yiling Yu, Yifei Yu, Linyou Cao, Yiping Zhao, and Yong Zhang

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Liqin Su, Layne Bradley, Yiling Yu, Yifei Yu, Linyou Cao, Yiping Zhao, and Yong Zhang, "Surface-enhanced Raman scattering of monolayer transition metal dichalcogenides on Ag nanorod arrays," Opt. Lett. 44, 5493-5496 (2019)

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- Spectroscopy
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About this Article
History
- Original Manuscript: July 29, 2019
- Revised Manuscript: October 11, 2019
- Manuscript Accepted: October 15, 2019
- Published: November 8, 2019

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Abstract

In this work, we studied surface-enhanced Raman scattering (SERS) of ${MS}_{2}$ ( $M = Mo$ , W) monolayers that were transferred onto Ag nanorod arrays. Compared to the suspended monolayers, the Raman intensity of monolayers on an Ag nanorod substrate was strongly enhanced for both in-plane and out-of-plane vibration modes: up to 8 (5) for $E_{2 g}$ and 20 (23) for $A_{1 g}$ in ${MoS}_{2}$ ( ${WS}_{2}$ ). This finding reveals a promising SERS substrate for achieving uniform and strong enhancement for two-dimensional materials in the applications of optical detecting and sensing.

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${MoS}_{2}$ Samples	Raman Frequency $({cm}^{- 1})$			Raman Intensity
${MoS}_{2}$ Samples	$v$ ( $E_{2 g}$ )	$v$ ( $A_{1 g}$ )	$Δ v$	$I (E_{2 g})$	$I (A_{1 g})$	R
${MoS}_{2} - SA$	384.6	405.5	20.9	0.58	0.38	0.66
${MoS}_{2} - Tran - SA$	385.9	404.3	18.4	0.40	0.31	0.76
${MoS}_{2} - Tran - {SiO}_{2} - suspended$	384.5	405.1	20.6	1.00	1.04	1.04
${MoS}_{2} - Tran - {SiO}_{2} - supported$	385.1	405.6	20.5	1.56	1.57	1.01
${MoS}_{2} - Tran - {SiO}_{2} - NA$	385.5	405.6	20.1	1.92	1.40	0.73
${MoS}_{2} - Ag$	384.4	405.0	20.6	6.76	18.54	2.74

${WS}_{2}$ Samples	Raman Frequency ( ${cm}^{- 1}$ )			Raman Intensity
${WS}_{2}$ Samples	$v$ ( $E_{2 g}$ )	$v$ ( $A_{1 g}$ )	$Δ v$	$I (E_{2 g})$	$I (A_{1 g})$	R
${WS}_{2} - SA$	357.9	419.1	61.2	0.24	0.08	0.34
${WS}_{2} - Tran - {SiO}_{2} - suspended$	357.0	417.3	60.3	1.00	0.35	0.35
${WS}_{2} - Tran - {SiO}_{2} - supported$	357.0	417.4	60.4	0.89	0.31	0.34
${WS}_{2} - Tran - {SiO}_{2} - NA$	356.6	417.6	61	0.96	0.31	0.32
${WS}_{2} - Ag$	357.2	418.0	60.8	5.85	5.63	0.96

${MoS}_{2}$ Samples	Raman Frequency $({cm}^{- 1})$			Raman Intensity
${MoS}_{2}$ Samples	$v$ ( $E_{2 g}$ )	$v$ ( $A_{1 g}$ )	$Δ v$	$I (E_{2 g})$	$I (A_{1 g})$	R
${MoS}_{2} - SA$	384.6	405.5	20.9	0.58	0.38	0.66
${MoS}_{2} - Tran - SA$	385.9	404.3	18.4	0.40	0.31	0.76
${MoS}_{2} - Tran - {SiO}_{2} - suspended$	384.5	405.1	20.6	1.00	1.04	1.04
${MoS}_{2} - Tran - {SiO}_{2} - supported$	385.1	405.6	20.5	1.56	1.57	1.01
${MoS}_{2} - Tran - {SiO}_{2} - NA$	385.5	405.6	20.1	1.92	1.40	0.73
${MoS}_{2} - Ag$	384.4	405.0	20.6	6.76	18.54	2.74

${WS}_{2}$ Samples	Raman Frequency ( ${cm}^{- 1}$ )			Raman Intensity
${WS}_{2}$ Samples	$v$ ( $E_{2 g}$ )	$v$ ( $A_{1 g}$ )	$Δ v$	$I (E_{2 g})$	$I (A_{1 g})$	R
${WS}_{2} - SA$	357.9	419.1	61.2	0.24	0.08	0.34
${WS}_{2} - Tran - {SiO}_{2} - suspended$	357.0	417.3	60.3	1.00	0.35	0.35
${WS}_{2} - Tran - {SiO}_{2} - supported$	357.0	417.4	60.4	0.89	0.31	0.34
${WS}_{2} - Tran - {SiO}_{2} - NA$	356.6	417.6	61	0.96	0.31	0.32
${WS}_{2} - Ag$	357.2	418.0	60.8	5.85	5.63	0.96

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