Nanoporous gold plasmonic structures for sensing applications

Ruffato, Gianluca; Romanato, Filippo; Garoli, Denis; Cattarin, Sandro

doi:10.1364/oe.19.013164

Cited by 61 publications

(47 citation statements)

References 17 publications

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“…Due to the known performance advantages, considerable efforts have been made to explore potential applications of nanoporous materials in various fields, such as catalysis, sensors, actuators, fuel cells, energy storage, bioelectrochemistry, plasmonic metamaterials, etc. [4,5,6,7]. …”

Section: Introductionmentioning

confidence: 99%

The Role of Computer Simulation in Nanoporous Metals—A Review

Xia

Liu

et al. 2015

Materials

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Nanoporous metals (NPMs) have proven to be all-round candidates in versatile and diverse applications. In this decade, interest has grown in the fabrication, characterization and applications of these intriguing materials. Most existing reviews focus on the experimental and theoretical works rather than the numerical simulation. Actually, with numerous experiments and theory analysis, studies based on computer simulation, which may model complex microstructure in more realistic ways, play a key role in understanding and predicting the behaviors of NPMs. In this review, we present a comprehensive overview of the computer simulations of NPMs, which are prepared through chemical dealloying. Firstly, we summarize the various simulation approaches to preparation, processing, and the basic physical and chemical properties of NPMs. In this part, the emphasis is attached to works involving dealloying, coarsening and mechanical properties. Then, we conclude with the latest progress as well as the future challenges in simulation studies. We believe that highlighting the importance of simulations will help to better understand the properties of novel materials and help with new scientific research on these materials.

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Section: Introductionmentioning

confidence: 99%

The Role of Computer Simulation in Nanoporous Metals—A Review

Xia

Liu

et al. 2015

Materials

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“…For this reasons, the cornet appears brown in colour [18][19][20][21][22]. This very interesting behaviour of nanoporous gold and gold nanoparticles has been studied also for many different applications, such as monitoring body fluids, new electronic devices and decorative effects [23][24][25][26][27][28][29][30][31].…”

Section: Cornet Stagementioning

confidence: 99%

The fire assay reloaded

Battaini¹,

Bemporad

Felicis

2013

Gold Bull

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The fire assay process is still the most accurate and precise method for measuring the gold content in gold alloys. Scanning electron microscopy and transmission electron microscopy have been applied to observe the change in microstructure of the samples undergoing the fire assay process. The performed observations reveal that the microstructure of the specimen is more complex than expected. Before the parting stage, the specimen is not a perfect gold-silver binary alloy but contains also copper-silver oxides and other residual compounds. The parting stage appears to be a dealloying process leading to a nanoporous gold nanostructure. What observed after partition explains the evolution of the shape and colour of the specimen and may allow for a better comprehension of the procedure and an improvement in the method.

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“…In most cases, both SPP and LSP resonances are present and contribute to the optical characteristics of the nanostructure. Plasmonic resonances are sensitive to the changes in refractive indices due to molecular adsorption on the metallic surface [2,3]. With regard to this phenomenon we demonstrated that a nanoporous gold (NPG) substrate can improve the sensitivity of a surface plasmon resonance (SPR) based biosensor, taking advantage of the high surface to volume ratio of the material.…”

Section: Introductionmentioning

confidence: 99%

“…With regard to this phenomenon we demonstrated that a nanoporous gold (NPG) substrate can improve the sensitivity of a surface plasmon resonance (SPR) based biosensor, taking advantage of the high surface to volume ratio of the material. The experimental verification was performed on a digital grating by measuring the SPR shift in reflectance and transmittance in the visible range [2][3][4][5]. The research efforts are still focused on the quest for novel plasmonic materials.…”

Section: Introductionmentioning

confidence: 99%

Engineered/tailored nanoporous gold structures for infrared plasmonics

Garoli

Calandrini

Cattarin³

et al. 2015

SPIE Proceedings

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Nanoporous gold is a very promising and novel material platform for mid-infrared and THz plasmonics. Nanoporous gold can be formed by dealloying of Ag-Au alloys, previously grown by means of Ag-Au co-sputtering. The optical response is completely determined by the nanostructural film features, that depend on the initial alloy composition and on the preparation procedure. The behavior of the material in mid-infrared and its peculiar morphology with a very high surface/volume ratio can be applied for the fabrication of nanostructures, like for example nanorods. Here we report the design and fabrication of nanoporous rods engineered to support resonances in the 1500-1700 cm -1 range where they can be exploited, for example, in the detection of protein conformational states. This novel paradigm points toward the development of a new class of efficient and highly-selective biosensors.

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Nanoporous gold plasmonic structures for sensing applications

Cited by 61 publications

References 17 publications

The Role of Computer Simulation in Nanoporous Metals—A Review

The Role of Computer Simulation in Nanoporous Metals—A Review

The fire assay reloaded

Engineered/tailored nanoporous gold structures for infrared plasmonics

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