Graphene-Enabled Silver Nanoantenna Sensors

Silver is the ideal material for plasmonics because of its low loss at optical frequencies but is often replaced by a more lossy metal, gold. This is because of silver’s tendency to tarnish and roughen, forming Ag2S on its surface, dramatically diminishing optical properties and rendering it unrelia...

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Bibliographic Details
Published in:Nano letters Vol. 12; no. 8; pp. 4090 - 4094
Main Authors: Reed, Jason C, Zhu, Hai, Zhu, Alexander Y, Li, Chen, Cubukcu, Ertugrul
Format: Journal Article
Language:English
Published: Washington, DC American Chemical Society 08.08.2012
Subjects:
Applied sciences
Atmospherics
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science; rheology
Devices
Durability
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronics
Exact sciences and technology
Fullerenes and related materials; diamonds, graphite
General equipment and techniques
Graphene
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Materials science
Molecular electronics, nanoelectronics
Nanostructure
Optical properties
Physics
Plasmonics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
Silver
Specific materials
Sulfur
Surface and interface electron states
nanoantennas
silver
Plasmonics
sulfidation
graphene
LSPR sensor
Damping
Gold
Nanostructures
Silver sulfide
Surface plasmons
Nanoelectronics
Silver
Nanometer scale
Graphene
Experimental design
Optical properties
Monolayers
Sensors
Sulfur
Nanoantenna
ISSN:1530-6984, 1530-6992, 1530-6992
Online Access:Get full text
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Summary:Silver is the ideal material for plasmonics because of its low loss at optical frequencies but is often replaced by a more lossy metal, gold. This is because of silver’s tendency to tarnish and roughen, forming Ag2S on its surface, dramatically diminishing optical properties and rendering it unreliable for applications. By passivating the surface of silver nanostructures with monolayer graphene, atmospheric sulfur containing compounds are unable to penetrate the graphene to degrade the surface of the silver. Preventing this sulfidation eliminates the increased material damping and scattering losses originating from the unintentional Ag2S layer. Because it is atomically thin, graphene does not interfere with the ability of localized surface plasmons to interact with the environment in sensing applications. Furthermore, after 30 days graphene-passivated silver (Ag–Gr) nanoantennas exhibit a 2600% higher sensitivity over that of bare Ag nanoantennas and 2 orders of magnitude improvement in peak width endurance. By employing graphene in this manner, the excellent optical properties and large spectral range of silver can be functionally utilized in a variety of nanoscale plasmonic devices and applications.
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ISSN:1530-6984
1530-6992
1530-6992
DOI:10.1021/nl301555t