Oxidation‐Resistant Silver Nanostructures for Ultrastable Plasmonic Applications

Sachan, Ritesh; Ramos, V; Malasi, Abhinav; Yadavali, Sagar; Bartley, B.; García, Hernando; Duscher, Gerd; Kalyanaraman, R.

doi:10.1002/adma.201204920

Cited by 57 publications

(73 citation statements)

References 21 publications

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“…For reference we have taken the 50% degradation in bandwidth for 100% Ag from ref. [25]. It can be noted that by keeping the amount of Ag fixed and changing the Co amount, the bandwidth decay can be slowed down by almost 8 time leading to more than a year of strong Ag plasmons.…”

Section: Methodsmentioning

confidence: 99%

“…The bimetal nanoparticles (NPs) of Co-Ag were synthesized by a laser self-organization process detailed in previous publications [25,[29][30][31][32]. This system was chosen because Co and Ag are immiscible metals, allowing for formation of nanoparticles with segregated regions of Ag and Co.…”

Section: Methodsmentioning

confidence: 99%

“…In this regards, while the bulk oxidation and corrosion behavior of metals has been well studied, similar data for metallic nanoparticles is lacking. In the last decade, several techniques have been employed to probe nanoscale oxidation, including x-ray scattering [21,22], electron energy-loss spectroscopy [23], optical spectroscopy [18,[24][25][26], surface enhanced Raman sensing [20,21,27], and cyclic voltammetry [28]. Here we utilize the LSPR technique to study the kinetics of nanoparticle metal oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Localized surface plasmon sensing based investigation of nanoscale metal oxidation kinetics

et al. 2015

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The localized surface plasmon resonance (LSPR) of nanoparticles can be a powerful and sensitive probe of chemical changes in nanoscale volumes. Here we have used the LSPR of silver (Ag) to study the oxidation kinetics of nanoscopic volumes of cobalt (Co) metal. Bimetal nanoparticles of the immiscible Co-Ag system prepared by pulsed laser dewetting were aged in ambient air and the resulting changes to the LSPR signal and bandwidth were used to probe the oxidation kinetics. Co was found to preferentially oxidize first. This resulted in a significant enhancement by a factor of 8 or more in the lifetime of stable Ag plasmons over that of pure Ag. Theoretical modeling based on optical mean field approximation was able to predict the oxidation lifetimes and could help design stable Ag-based plasmonic nanoparticles for sensing applications.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Localized surface plasmon sensing based investigation of nanoscale metal oxidation kinetics

et al. 2015

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“…Some groups have studied the morphological transformation of pure metallic (Ag), bimetallic (Ag-Co) and alloy (Cu-Ni) thin films of different thicknesses to understand the dewetting process during laser annealing. [35][36][37][38] Normally X-ray diffraction, 39,40 electrical probing, 41 auger electron spectroscopy 42 and transmission electron microscopy (TEM) 15 techniques are used to monitor and characterize the processes involved during the post-deposition annealing of the metal thin films. However most of the above techniques provide limited understanding about the growth mechanism, morphological reorganization and crystallization kinetics during the post-deposition annealing of thin films because of geometrical modeling based estimation of RSP's from the large sequence of observation data.…”

Section: Introductionmentioning

confidence: 99%

A study of growth and thermal dewetting behavior of ultra-thin gold films using transmission electron microscopy

Sudheer

Mondal

et al. 2017

AIP Advances

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The growth and solid-state dewetting behavior of Au thin films (0.7 to 8.4 nm) deposited on the formvar film (substrate) by sputtering technique have been studied using transmission electron microscopy. The size and number density of the Au nanoparticles (NPs) change with an increase in the film thickness (0.7 to 2.8 nm). Nearly spherical Au NPs are obtained for <3 nm thickness films whereas percolated nanostructures are observed for ≥3 nm thickness films as a consequence of the interfacial interaction of Au and formvar film. The covered area fraction (CAF) increases from ∼13 to 75 % with the change in film thickness from 0.7 to 8.4 nm. In-situ annealing of ≤3 nm film produces comparatively bigger size and better sphericity Au NPs along with their narrow distributions, whereas just percolated film produces broad distribution in size having spherical as well as elongated Au NPs. The films with thickness ≤3 nm show excellent thermal stability. The films having thickness >6 nm show capability to be used as an irreversible temperature sensor with a sensitivity of ∼0.1 CAF/°C. It is observed that annealing affects the crystallinity of the Au grains in the films. The electron diffraction measurement also shows annealing induced morphological evolution in the percolated Au thin films (≥3 nm) during solid-state dewetting and recrystallization of the grains.

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“…Bimetallic materials are a promising new way to realize new and/or better plasmonic behaviors [3,4]. In this paper we first use high-resolution transmission electron microscopy to present evidence for ferroplasmons, strong surface plasmons that appear in ferromagnetic metals when in the proximity of noble metal nanostructures.…”

mentioning

confidence: 99%

Ferroplasmons: Novel Plasmons in Metal-Ferromagnetic Bimetallic Nanostructures

Malasi

Passarelli

et al. 2015

Microsc Microanal

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New plasmonic materials are required to enable potential strong coupling of light and magnetism, which could lead to improved data storage and/or completely novel optical materials [1,2]. Bimetallic materials are a promising new way to realize new and/or better plasmonic behaviors [3,4]. In this paper we first use high-resolution transmission electron microscopy to present evidence for ferroplasmons, strong surface plasmons that appear in ferromagnetic metals when in the proximity of noble metal nanostructures. To better understand and explore the origin of these ferroplasmons we have developed a simple approach to synthesize electron transparent nanostructures so as to compare their plasmonic properties by electron energy loss spectroscopy and compare with calculations performed using the discrete dipole approximation (DDA) approach. Fig. 1(a) shows the high angle annular dark field (HAADF) image of a Co-Ag bimetallic nanoparticle formed on an amorphous carbon substrate by pulsed laser dewetting. A Zeiss Libra 200 TEM with a monochromator and energy filter was used to characterize the nanostructure by HAADF mode and electron energy-loss spectroscopy (EELS) at 200 kV. To understand the spatial nature of surface plasmons in these nanoparticles we generated the maps of plasmons from different energy windows, with the 0 to 3 eV data shown in Fig. 1(b-c) and 3 to 5 eV data shown in Fig. 1(d-e). For the 0 -3 eV region, the strongest surface plasmon occurred at 2.6±0.3 eV and measurement of the scattering probability [ Fig. 1(b)] and full width half maxima (FWHM) [ Fig. 1(c)] showed that the Co region had a strong plasmon, called the ferroplasmon. In contrast, analysis of the 3 to 5 eV window showed that a surface plasmon occurred at energy of 3.5 ± 0.3 eV and the scattering probability is shown in Fig. 1(d), while the FWHM is shown in Fig. 1(e). This peak was seen to be highly localized to the Ag region. Similar measurements done on pure Co nanoparticles did not show any evidence for these strong ferroplasmons seen when Co was in the vicinity of Ag.DDA modeling has suggested that ferroplasmons can be a result of electromagnetic coupling between the two metals [2]. To investigate this further, we developed a technique to rapidly prepare electron transparent nanostructures and perform EELS on at different energy windows and compare these experiments with DDA electrodynamics theory. The sample preparation involved a combination of nanosphere lithography and a carbon substrate float-off process. Fig. 1(f) shows the Z-contrast from HAADF imaging of pairs of non-touching bimetallic Co-Ag triangles

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Oxidation‐Resistant Silver Nanostructures for Ultrastable Plasmonic Applications

Cited by 57 publications

References 21 publications

Localized surface plasmon sensing based investigation of nanoscale metal oxidation kinetics

Localized surface plasmon sensing based investigation of nanoscale metal oxidation kinetics

A study of growth and thermal dewetting behavior of ultra-thin gold films using transmission electron microscopy

Ferroplasmons: Novel Plasmons in Metal-Ferromagnetic Bimetallic Nanostructures

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