Enhanced SERS Stability of R6G Molecules with Monolayer Graphene

Zhao, Yuda; Xie, Yizhu; Bao, Zhiyong; Tsang, Yuen Hong; Xie, Liming; Chai, Yang

doi:10.1021/jp503487a

Cited by 77 publications

(57 citation statements)

References 44 publications

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“…The highly impermeable graphene has been demonstrated for impeding the migration of liquid, gas and chemical/biological molecules [12][13][14][15][16][17] . Recently, researchers used graphene layer for preventing the reaction and inter-diffusion at the interfaces of Al/Si, Cu/Si and Au/Ni [18][19][20] .…”

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confidence: 99%

Mass Transport Mechanism of Cu Species at the Metal/Dielectric Interfaces with a Graphene Barrier

et al. 2014

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The interface between the metal and dielectric is an indispensable part in various electronic devices. The migration of metallic species into the dielectric can adversely affect the reliability of the insulating dielectric and can also form a functional solid-state electrolyte device. In this work, we insert graphene between Cu and SiO2 as a barrier layer and investigate the mass transport mechanism of Cu species through the graphene barrier using density functional theory calculations, second-ion mass spectroscopy (SIMS), capacitance-voltage measurement, and cyclic voltammetry. Our theoretical calculations suggest that the major migration path for Cu species to penetrate through the multiple-layered graphene is the overlapped defects larger than 0.25 nm2. The depth-profile SIMS characterizations indicate that the "critical" thickness of the graphene barrier for completely blocking the Cu migration is 5 times smaller than that of the conventional TaN barrier. Capacitance-voltage and cyclic voltammetry measurement reveal that the electrochemical reactions at the Cu/SiO2 interface become a rate-limiting factor during the bias-temperature stressing process with the use of a graphene barrier. These studies provide a distinct roadmap for designing controllable mass transport in solid-state electrolyte devices with the use of a graphene barrier.

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confidence: 99%

Mass Transport Mechanism of Cu Species at the Metal/Dielectric Interfaces with a Graphene Barrier

et al. 2014

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“…Another advantage to combine graphene and metallic nanostructures it that graphene can help protect molecules from photoinduced damage, such as photobleaching [19,32,60,61]. The photobleaching (or photodegradation) of the Raman analytes induced by the laser is a well-known phenomenon in normal SERS experiments, especially for dye molecules.…”

Section: Two-dimensional Materials Combined With Metallic Nanostructuresmentioning

confidence: 99%

“…When combining graphene with metallic nanostructure, the hybrid SERS platform is more stable against photoinduced damage, but with a comparable enhancement factor. Zhao et al [61] demonstrated that graphene underneath the organic molecules inhibited the substrateinduced fluctuations; and graphene on top of the organic molecules encapsulated and isolated them from ambient oxygen, greatly enhancing the photostability. Liu et al [32] fabricated graphene-encapsulated metal nanoparticles for molecule detection and found out that AuNP/graphene hybrid substrate could significantly suppress photobleaching and fluorescence of phthalocyanine and R6G molecules.…”

Section: Two-dimensional Materials Combined With Metallic Nanostructuresmentioning

confidence: 99%

A Review on Applications of Two-Dimensional Materials in Surface-Enhanced Raman Spectroscopy

Xia

2018

International Journal of Spectroscopy

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Two-dimensional (2D) materials, such as graphene and MoS 2 , have been attracting wide interest in surface enhancement Raman spectroscopy. This perspective gives an overview of recent developments in 2D materials' application in surface-enhanced Raman spectroscopy. This review paper focuses on the applications of using bare 2D materials and metal/2D material hybrid substrate for Raman enhancement. The Raman enhancing mechanism of 2D materials will also be discussed. The progress covered herein shows great promise for widespread adoption of 2D materials in SERS application.

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“…The problems associated with photoinduced damage, including photocarbonization and photobleaching, can be effectively suppressed. Zhao et al further discussed the mechanism by which the graphene coating enhances the stability and reproducibility of the SERS signal of organic molecules . They showed that a graphene layer provides another path for the relaxation of the excited state in organic molecules and encapsulates organic molecules to prevent the reaction between the organic molecules and O in ambient conditions.…”

Section: Highly Impermeable 2d Materials Membranesmentioning

confidence: 99%

Two‐Dimensional Material Membranes: An Emerging Platform for Controllable Mass Transport Applications

Zhao

Xie

Liu

et al. 2014

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Two-dimensional materials provide an ideal platform for studying the fundamental properties of atomic-level thickness systems, and are appropriate for lots of engineering applications in various fields. Although 2D materials are the thinnest membranes, they have been revealed to have high impermeability even to the smallest molecule. By the virtue of this high impermeability of the 2D materials in combination with their other unique properties, 2D materials open up a variety of applications that are impossible for conventional membranes. In this review, the latest applications based on high impermeability and selective permeation of these 2D material membranes are overviewed for different fields, including environmental control, chemical engineering, electronic devices, and biosensors. The working mechanism for each kind of application is described in detail. A summary and outlook is then provided on the challenges and new directions in this emerging research field.

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Enhanced SERS Stability of R6G Molecules with Monolayer Graphene

Cited by 77 publications

References 44 publications

Mass Transport Mechanism of Cu Species at the Metal/Dielectric Interfaces with a Graphene Barrier

Mass Transport Mechanism of Cu Species at the Metal/Dielectric Interfaces with a Graphene Barrier

A Review on Applications of Two-Dimensional Materials in Surface-Enhanced Raman Spectroscopy

Two‐Dimensional Material Membranes: An Emerging Platform for Controllable Mass Transport Applications

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