Plasmonic cavities derived from silver nanoparticles atop a massed silver surface for surface enhancement Raman scattering

RSC Advances ◽  
2014 ◽  
Vol 4 (84) ◽  
pp. 44457-44461 ◽  
Author(s):  
Shu-Chun Cheng ◽  
Ten-Chin Wen ◽  
Yung-Chiang Lan
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Silver Surface ◽  
Surface Enhancement ◽  
Silver Nanocubes

Various plasmonic cavities (PC) are formed by positioning silver nanocubes or nanospheres on a massed silver surface, being magnificently useful for surface enhancement Raman scattering (SERS) application.

Thin and Robust Encapsulation of Silver and Gold Nanoparticles with Dithiocarbamate-anchored Polyelectrolytes

2011 ◽  
Vol 1348 ◽  
Author(s):  
Chih-Yu Jao ◽  
Kai Chen ◽  
Yong-Woo Lee ◽  
Hans D. Robinson
Keyword(s):  
Silver Nanoparticles ◽  
Serum Proteins ◽  
Particle Surface ◽  
Amine Functionalization ◽  
Silver Surface ◽  
Gold And Silver Nanoparticles ◽  
Silver Nanocubes ◽  
Amine Groups ◽  
Low Cytotoxicity ◽  
Positively Charged

ABSTRACTA robust, stable and thin primary amine functionalization is applied to gold and silver nanoparticles from poly(allylamine hydrochloride) (PAH) by converting a fraction of the amine groups in the polymer to dithiocarbamate (DTC) ligands, which absorb strongly onto noble metal surfaces. We observe marked improvements in the properties of gold nanospheres with a DTC-anchored rather than physisorbed PAH cap. The same level of improvement is not seen in silver nanoparticles, although it is clear from a distinct change in the plasmon spectrum in silver nanocubes that the DTC ligand does interact with the silver surface. In spite of their amine functionalization, both silver and gold particles show low cytotoxicity, possibly due to absorption of serum proteins forming a protective coating on the positively charged particle surface.

scholarly journals Silver SERS Adenine Sensors with a Very Low Detection Limit

Biosensors ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 53 ◽  
Author(s):  
Yonhua Tzeng ◽  
Bo-Yi Lin
Keyword(s):  
Silver Nanoparticles ◽  
Electromagnetic Field ◽  
Detection Limit ◽  
Raman Scattering ◽  
Electric Fields ◽  
Water Solution ◽  
Silver Surface ◽  
Surface Diffusivity ◽  
Low Detection Limit ◽  
Low Field

The detection of adenine molecules at very low concentrations is important for biological and medical research and applications. This paper reports a silver-based surface-enhanced Raman scattering (SERS) sensor with a very low detection limit for adenine molecules. Clusters of closely packed silver nanoparticles on surfaces of discrete ball-like copper bumps partially covered with graphene are deposited by immersion in silver nitrate. These clusters of silver nanoparticles exhibit abundant nanogaps between nanoparticles, where plasmonic coupling induces very high local electromagnetic fields. Silver nanoparticles growing perpendicularly on ball-like copper bumps exhibit surfaces of large curvature, where electromagnetic field enhancement is high. Between discrete ball-like copper bumps, the local electromagnetic field is low. Silver is not deposited on the low-field surface area. Adenine molecules interact with silver by both electrostatic and functional groups and exhibit low surface diffusivity on silver surface. Adenine molecules are less likely to adsorb on low-field sensor surface without silver. Therefore, adenine molecules have a high probability of adsorbing on silver surface of high local electric fields and contribute to the measured Raman scattering signal strength. We demonstrated SERS sensors made of clusters of silver nanoparticles deposited on discrete ball-like copper bumps with very a low detection limit for detecting adenine water solution of a concentration as low as 10−11 M.

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