Spontaneous nano-gap formation in Ag film using NaCl sacrificial layer for Raman enhancement

Kyungchan Min; Wook Jin Jeon; Youngho Kim; Jae Young Choi; Hak Ki Yu

doi:10.1088/1361-6528/aaa746

Spontaneous nano-gap formation in Ag film using NaCl sacrificial layer for Raman enhancement

Kyungchan Min
, Wook Jin Jeon
, Youngho Kim
, Jae Young Choi
, Hak Ki Yu

Department of Advanced Materials Science and Engineering

Ajou University

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

We report the method of fabrication of nano-gaps (known as hot spots) in Ag thin film using a sodium chloride (NaCl) sacrificial layer for Raman enhancement. The Ag thin film (20-50 nm) on the NaCl sacrificial layer undergoes an interfacial reaction due to the AgCl formed at the interface during water molecule intercalation. The intercalated water molecules can dissolve the NaCl molecules at interfaces and form the ionic state of Na⁺ and Cl^-, promoting the AgCl formation. The Ag atoms can migrate by the driving force of this interfacial reaction, resulting in the formation of nano-size gaps in the film. The surface-enhanced Raman scattering activity of Ag films with nano-size gaps has been investigated using Raman reporter molecules, Rhodamine 6G (R6G).

Original language	English
Article number	105502
Journal	Nanotechnology
Volume	29
Issue number	10
DOIs	https://doi.org/10.1088/1361-6528/aaa746
State	Published - 31 Jan 2018

Keywords

Ag hot spot
NaCl
Raman enhancement
SERS

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10.1088/1361-6528/aaa746

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title = "Spontaneous nano-gap formation in Ag film using NaCl sacrificial layer for Raman enhancement",

abstract = "We report the method of fabrication of nano-gaps (known as hot spots) in Ag thin film using a sodium chloride (NaCl) sacrificial layer for Raman enhancement. The Ag thin film (20-50 nm) on the NaCl sacrificial layer undergoes an interfacial reaction due to the AgCl formed at the interface during water molecule intercalation. The intercalated water molecules can dissolve the NaCl molecules at interfaces and form the ionic state of Na+ and Cl-, promoting the AgCl formation. The Ag atoms can migrate by the driving force of this interfacial reaction, resulting in the formation of nano-size gaps in the film. The surface-enhanced Raman scattering activity of Ag films with nano-size gaps has been investigated using Raman reporter molecules, Rhodamine 6G (R6G).",

keywords = "Ag hot spot, NaCl, Raman enhancement, SERS",

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AU - Min, Kyungchan

AU - Jeon, Wook Jin

AU - Kim, Youngho

AU - Choi, Jae Young

AU - Yu, Hak Ki

PY - 2018/1/31

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N2 - We report the method of fabrication of nano-gaps (known as hot spots) in Ag thin film using a sodium chloride (NaCl) sacrificial layer for Raman enhancement. The Ag thin film (20-50 nm) on the NaCl sacrificial layer undergoes an interfacial reaction due to the AgCl formed at the interface during water molecule intercalation. The intercalated water molecules can dissolve the NaCl molecules at interfaces and form the ionic state of Na+ and Cl-, promoting the AgCl formation. The Ag atoms can migrate by the driving force of this interfacial reaction, resulting in the formation of nano-size gaps in the film. The surface-enhanced Raman scattering activity of Ag films with nano-size gaps has been investigated using Raman reporter molecules, Rhodamine 6G (R6G).

AB - We report the method of fabrication of nano-gaps (known as hot spots) in Ag thin film using a sodium chloride (NaCl) sacrificial layer for Raman enhancement. The Ag thin film (20-50 nm) on the NaCl sacrificial layer undergoes an interfacial reaction due to the AgCl formed at the interface during water molecule intercalation. The intercalated water molecules can dissolve the NaCl molecules at interfaces and form the ionic state of Na+ and Cl-, promoting the AgCl formation. The Ag atoms can migrate by the driving force of this interfacial reaction, resulting in the formation of nano-size gaps in the film. The surface-enhanced Raman scattering activity of Ag films with nano-size gaps has been investigated using Raman reporter molecules, Rhodamine 6G (R6G).

KW - Ag hot spot

KW - NaCl

KW - Raman enhancement

KW - SERS

UR - https://www.scopus.com/pages/publications/85041441526

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VL - 29

JO - Nanotechnology

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Spontaneous nano-gap formation in Ag film using NaCl sacrificial layer for Raman enhancement

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Keywords

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