Plasmon-enhanced fluorescence of dyes on silica-coated silver nanoparticles: A single-nanoparticle spectroscopy study

Blake-Hedges, Jacquelyn M.; Greenspan, Seth H.; Kean, John A.; McCarron, Matthew A.; Mendonca, Matthew L.; Wustholz, Kristin L.

doi:10.1016/j.cplett.2015.06.083

Cited by 15 publications

(6 citation statements)

References 44 publications

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“…Liz-Marzan and coworkers were the first to address this challenge by applying a surface primer, specifically a silane coupling agent, to provide the AgNP surface with silanol anchoring groups and stabilize them in the alcoholic medium [8]. Since then, different polymers or discrete molecules such as PVP [9], arabic gum [10], Daxa19 [11], glucose [12], 2-mercaptoethanesulfonate (MES) [13], or 16-mercaptohexadecanoic acid (MHA) [14] have been proposed to facilitate the controlled deposition of silica on AgNPs [9][10][11][12][13][14]. It should be noted that the direct silica deposition on small citrate-stabilized AgNPs (ca.…”

Section: Introductionmentioning

confidence: 99%

Adenosine-Monophosphate-Assisted Homogeneous Silica Coating of Silver Nanoparticles in High Yield

Fernández-Lodeiro,

Tambosi,

Fernández-Lodeiro

et al. 2023

Nanomaterials

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In this study, we propose a novel approach for the silica coating of silver nanoparticles based on surface modification with adenosine monophosphate (AMP). Upon AMP stabilization, the nanoparticles can be transferred into 2-propanol, promoting the growth of silica on the particle surfaces through the standard Stöber process. The obtained silica shells are uniform and homogeneous, and the method allows a high degree of control over shell thickness while minimizing the presence of uncoated NPs or the negligible presence of core-free silica NPs. In addition, AMP-functionalized AgNPs could be also coated with a mesoporous silica shell using cetyltrimethylammonium chloride (CTAC) as a template. Interestingly, the thickness of the mesoporous silica coating could be tightly adjusted by either the silica precursor concentration or by varying the CTAC concentration while keeping the silica precursor concentration constant. Finally, the influence of the silica coating on the antimicrobial effect of AgNPs was studied on Gram-negative bacteria (R. gelatinosus and E. coli) and under different bacterial growth conditions, shedding light on their potential applications in different biological environments.

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Section: Introductionmentioning

confidence: 99%

Adenosine-Monophosphate-Assisted Homogeneous Silica Coating of Silver Nanoparticles in High Yield

Fernández-Lodeiro,

Tambosi,

Fernández-Lodeiro

et al. 2023

Nanomaterials

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“…Other compounds that can be chosen are arene compounds [12,40,42,45], surfactants [4], crown compounds [53], complex compounds [23], and silica [18]. Many of these compounds have been reported to increase the stability of AgNPs through their interaction with Ag metal.…”

Section: Surface Modification With Other Compoundsmentioning

confidence: 99%

“…The methods development for detecting organic or inorganic target molecules in chemical and biological samples have been widely reported. Those methods have been applied in many types of samples as follows: urine [1][2][3][4][5], blood plasma [2,4,[6][7][8], water [9][10][11][12][13], food [14], drink [11,13,[15][16] and drugs [7,[17][18][19][20][21][22][23]. Several strategies have been implemented to produce sensitive, selective, effective, and efficient methods.…”

Section: ■ Introductionmentioning

confidence: 99%

Strategies in Improving Sensitivity of Colorimetry Sensor Based on Silver Nanoparticles in Chemical and Biological Samples

et al. 2022

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Colorimetric sensors-based silver nanoparticles (AgNPs) are very interesting to be studied and developed because of the simplicity and ease in the principle of detection. It does not require sophisticated and affordable tools but still has high sensitivity. The coefficient extinction of AgNPs is relatively higher than AuNPs of the same size, making the sensitivity of AgNPs higher than AuNPs. The principle of detection is based on the aggregation of nanoparticles with analytes that causes shifting in Localized Surface Plasmon Resonance (LSPR) to a larger wavelength, commonly called a bathochromic shift or redshift. It is a favorite phenomenon because it is more easily observed with naked eyes. This sensor shows a good analytic performance with high sensitivity due to strong LSPR and good strategies that selectively bring interaction between analytes and AgNPs. AgNPs are characterized using UV-Visible (Ultra Violet-Visible), TEM (Transmission Electron Microscope), FTIR (Fourier Transform Infrared), and DLS (Dynamic Light Scattering), and many analytes have been detected with this sensor successfully. This article discusses several important parameters in increasing the sensitivity of AgNPs colorimetric sensors. Finally, it can be used as guidelines in the development of methods in the future.

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“…[42] Although the optimal distance depends on the type of nanoparticle and the overlap between its plasmon resonance band and the emission band of the fluorophore, typical values range from 5 to 20 nm often resulting in an enhancement factor of more than 10. [140][141][142][143] In SEF-based sensing applications, functionalization of the silica spacer is often exploited to achieve selective recognition for certain analytes. For instance, DNA tagged with a fluorophore displaying specific recognition has been used to detect traces of mercury.…”

Section: Surface Enhanced Fluorescencementioning

confidence: 99%

Silica‐Coated Plasmonic Metal Nanoparticles in Action

2018

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Hybrid colloids consisting of noble metal cores and metal oxide shells have been under intense investigation for over two decades and have driven progress in diverse research lines including sensing, medicine, catalysis, and photovoltaics. Consequently, plasmonic core-shell particles have come to play a vital role in a plethora of applications. Here, an overview is provided of recent developments in the design and utilization of the most successful class of such hybrid materials, silica-coated plasmonic metal nanoparticles. Besides summarizing common simple approaches to silica shell growth, special emphasis is put on advanced synthesis routes that either overcome typical limitations of classical methods, such as stability issues and undefined silica porosity, or grant access to particularly sophisticated nanostructures. Hereby, a description is given, how different types of silica can be used to provide noble metal particles with specific functionalities. Finally, applications of such nanocomposites in ultrasensitive analyte detection, theranostics, catalysts, and thin-film solar cells are reviewed.

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Plasmon-enhanced fluorescence of dyes on silica-coated silver nanoparticles: A single-nanoparticle spectroscopy study

Cited by 15 publications

References 44 publications

Adenosine-Monophosphate-Assisted Homogeneous Silica Coating of Silver Nanoparticles in High Yield

Adenosine-Monophosphate-Assisted Homogeneous Silica Coating of Silver Nanoparticles in High Yield

Strategies in Improving Sensitivity of Colorimetry Sensor Based on Silver Nanoparticles in Chemical and Biological Samples

Silica‐Coated Plasmonic Metal Nanoparticles in Action

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