Linking Ag Nanoparticles by Aliphatic α,ω-Dithiols: A Study of the Aggregation and Formation of Interparticle Hot Spots

2013 ◽  
Vol 117 (31) ◽  
pp. 16203-16212 ◽  
Author(s):  
Irene Izquierdo-Lorenzo ◽  
Jana Kubackova ◽  
Delphine Manchon ◽  
Alexis Mosset ◽  
Emmanuel Cottancin ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Hot Spots

Inkjet printing Ag nanoparticles for SERS hot spots

2018 ◽  
Vol 10 (26) ◽  
pp. 3215-3223 ◽  
Author(s):  
Carmelo Miccichè ◽  
Giuseppe Arrabito ◽  
Francesco Amato ◽  
Gianpiero Buscarino ◽  
Simonpietro Agnello ◽  
...  
Keyword(s):  
Inkjet Printing ◽  
Ag Nanoparticles ◽  
Hot Spots ◽  
Ohnesorge Number ◽  
Sers Detection

SERS detection of a few alizarin molecules is carried out on hot spots spontaneously generated within low Ohnesorge number picoliter-scale droplets.

Self-assembly of α,ω-aliphatic diamines on Ag nanoparticles as an effective localized surface plasmon nanosensor based in interparticle hot spots

2009 ◽  
Vol 11 (34) ◽  
pp. 7363 ◽  
Author(s):  
Luca Guerrini ◽  
Irene Izquierdo-Lorenzo ◽  
José V. Garcia-Ramos ◽  
Concepción Domingo ◽  
Santiago Sanchez-Cortes
Keyword(s):  
Surface Plasmon ◽  
Self Assembly ◽  
Ag Nanoparticles ◽  
Hot Spots ◽  
Localized Surface Plasmon ◽  
Aliphatic Diamines

A split-type structure of Ag nanoparticles and Al2O3@Ag@Si nanocone arrays: an ingenious strategy for SERS-based detection

Nanoscale ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 4359-4365 ◽  
Author(s):  
Zhen Wang ◽  
Chunxue Zheng ◽  
Peng Zhang ◽  
Zhulin Huang ◽  
Chuhong Zhu ◽  
...  
Keyword(s):  
Chemical Stability ◽  
Ag Nanoparticles ◽  
Hot Spots ◽  
High Density ◽  
Type Structure ◽  
Sers Substrate ◽  
Détection Signal ◽  
Ordered Array ◽  
Detection Signal

A split-type nanostructure based on an ordered array and Ag nanoparticles was fabricated as an SERS substrate with high-density SERS hot spots, which exhibited excellent detection signal reproducibility and chemical stability.

Nanocomposites With Strong Optical Resonances: Silver Nanoparticles-Organic Molecules Systems

2008 ◽  
Author(s):  
Petr Smejkal ◽  
Blanka Vlckova ◽  
Ioana Pavel ◽  
Martin Moskovits ◽  
Magdalena Sladkova ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Ag Nanoparticles ◽  
Hot Spots ◽  
Spectral Measurements ◽  
Optical Fields ◽  
Optical Resonances ◽  
Transmission Electron ◽  
Surface Enhanced ◽  
Positively Charged ◽  
Subsequent Incorporation

The ability of selected molecular species to link Ag nanoparticles into dimers and/or small aggregates has been tested. Dimercaptocarborane and ethidium bromide have been shown to link Ag nanoparticles via their bonding to Ag nanoparticle surface probably by the two strongly argentophilic groups in para-positions. Alternatively, dimers and small aggregates were assembled through an electrostatic interaction between negatively charged citrate-modified and positively charged polylysine-modified Ag nanoparticles, and a subsequent incorporation of 5, 10, 15, 20-tetrakis(4-sulphonato-phenyl)porphine (TSPP) into such preprepared nanoobjects has been probed by SERRS (surface-enhanced resonance Raman scattering). Formation of dimers and small aggregates has been established by TEM (transmission electron microscopy) and SEM (scanning electron microscopy). SE(R)RS spectral measurements from specific locations of samples containing molecularly-linked dimers and aggregates have shown temporal fluctuations (blinking) of the SE(R)RS signal, which indicates, that the signal likely originates from molecules located in the strong, nanoscale localized optical fields dubbed hot spots. In addition to that, characteristic bands of graphitic carbon were observed in the spectra and their intensities (together with the spectral background intensities) strongly varied with time and from one spectrum to another. One of the possible explanations of these observations is a photochemical and/or thermal decomposition of the molecules located in hot spots combined with diffusion of unperturbed molecules into hot spots.

Building Highly Selective Hot Spots in Ag Nanoparticles Using Bifunctional Viologens: Application to the SERS Detection of PAHs

2008 ◽  
Vol 112 (20) ◽  
pp. 7527-7530 ◽  
Author(s):  
Luca Guerrini ◽  
José V. Garcia-Ramos ◽  
Concepción Domingo ◽  
Santiago Sanchez-Cortes
Keyword(s):  
Ag Nanoparticles ◽  
Hot Spots ◽  
Sers Detection

scholarly journals Synthesis and Plasmonic Chiroptical Studies of Sodium Deoxycholate Modified Silver Nanoparticles

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1291 ◽  
Author(s):  
Jing Wang ◽  
Kai-Xuan Fei ◽  
Xin Yang ◽  
Shuai-Shuai Zhang ◽  
Yin-Xian Peng
Keyword(s):  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Hot Spots ◽  
Sodium Deoxycholate ◽  
Coulomb Interactions ◽  
Chiral Molecules ◽  
Ag Nps ◽  
Line Shapes ◽  
Visible Wavelength Range ◽  
Distinct Line

Sodium deoxycholate modified silver nanoparticles prepared in the presence of sodium deoxycholate as a chiral inducer exhibit plasmonic circular dichroism (CD) signals. The plasmon-induced chirality arises from the presence of chiral molecules (sodium deoxycholate) on the surface of Ag nanoparticles, which transfer their chiral properties to the visible wavelength range due to the Coulomb interactions between the chiral molecules and plasmonic nanoparticles. The prepared Ag nanoparticles (NPs) exhibit distinct line shapes of plasmonic CD, which can be tailored by varying the pH values of the solutions. A mechanism was proposed to explain the generation of the distinct plasmonic CD shapes, which indicated that the arrangements of chiral molecules in the plasmonic hot spots between Ag NPs are crucial for the induced plasmonic CD.

A high-performance oil-free backing pump for electron microscopes

1978 ◽  
Vol 36 (1) ◽  
pp. 110-111
Author(s):  
G.K.W. Balkau ◽  
E. Bez ◽  
J.L. Farrant
Keyword(s):  
Molecular Weight ◽  
Electron Microscope ◽  
Hot Spots ◽  
High Performance ◽  
Carbonaceous Material ◽  
Contamination Rate ◽  
Low Molecular Weight ◽  
Principal Source ◽  
Rotary Pumps ◽  
Electron Microscopes

The earliest account of the contamination of electron microscope specimens by the deposition of carbonaceous material during electron irradiation was published in 1947 by Watson who was then working in Canada. It was soon established that this carbonaceous material is formed from organic vapours, and it is now recognized that the principal source is the oil-sealed rotary pumps which provide the backing vacuum. It has been shown that the organic vapours consist of low molecular weight fragments of oil molecules which have been degraded at hot spots produced by friction between the vanes and the surfaces on which they slide. As satisfactory oil-free pumps are unavailable, it is standard electron microscope practice to reduce the partial pressure of organic vapours in the microscope in the vicinity of the specimen by using liquid-nitrogen cooled anti-contamination devices. Traps of this type are sufficient to reduce the contamination rate to about 0.1 Å per min, which is tolerable for many investigations.

World Bank pinpoints disaster hot spots

Nature ◽  
2005 ◽  
Author(s):  
Deirdre Lockwood
Keyword(s):  
World Bank ◽  
Hot Spots
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