Effect of the size of silver nanoparticles on SERS signal enhancement

He, Rui; Liang, Robert; Peng, Peng; Zhou, Yang

doi:10.1007/s11051-017-3953-0

Cited by 83 publications

(52 citation statements)

References 43 publications

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“…Spectra in Figure 1(d,e) show broader resonance bands with a maximum shift in absorption maxima observed in 1: 4 ratio at 470 nm. Consequently, the more the time of exposure, the more the bandwidth and increase in absorption maxima resulting in polydispersity and size increment of the CPAgNPs (27,28). In addition, the bioreduction process leading to the formation of CPAgNPs occurred due to the availability and interaction of the phytochemical constituents in C. paradisi peel extracts creating the capping and stability effects on the synthesized nanoparticles from aggregation (12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29).…”

Section: Uv-visible Analysismentioning

confidence: 99%

Optimization of microwave-assisted synthesis of silver nanoparticle byCitrus paradisipeel and its application against pathogenic water strain

Ayinde

Gitari

Samie

2019

Green Chemistry Letters and Reviews

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This study focuses on time-dependent microwave-assisted biosynthesis of silver nanoparticles using aqueous peel extracts of Citrus paradisi as a reducing, stabilizing and capping agent with emphasis on its antibacterial property. Optical, structural and morphological properties of the synthesized Citrus paradisi peel extract silver nanoparticle (CPAgNp) were characterized using UV-visible spectrophotometer, transmission electron microscope (TEM), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), Brunauer-Emmett-Teller (BET) and Xray diffractometer (XRD). The antimicrobial activity was evaluated using the well-and discdiffusion methods. Characteristic surface plasmon resonance (SPR) wavelength in the range of 420-440 nm at an optimized intensity growth rate typical of silver nanoparticles was obtained. The synthesized CPAgNp are spherical in shape having the size range of 14.84 ± 5 nm and possessing fcc unit phase structure. The Citrus paradisi peel extract mediated AgNp were found to possess a broad-spectrum antimicrobial activity against water-borne pathogenic microbes.

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Section: Uv-visible Analysismentioning

confidence: 99%

Optimization of microwave-assisted synthesis of silver nanoparticle byCitrus paradisipeel and its application against pathogenic water strain

Ayinde

Gitari

Samie

2019

Green Chemistry Letters and Reviews

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“…The total stability of the system is influenced by two types of stabilisation of silver nanoparticles: steric stabilisation and electrochemical stabilisation. As a result of the presence of large molecules, tannic acid prevented the silver particles from being in close contact, causing the formation of the so-called steric effect [21]. On the other hand, the system was stabilised as a result of electrostatic stabilisation, which is described by the zeta potential.…”

Section: Effect Of the Tannic Acid Concentration And Temperaturementioning

confidence: 99%

Continuous Production of Silver Nanoparticles and Process Control

Długosz

Banach

2019

J Clust Sci

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The purpose of this research was to prepare silver nanoparticles in a tubular reactor using tannic acid as both a reducing agent and a stabiliser. The stability of the process was determined using statistical analysis with control charts. The qualitative analysis of the resulting colloidal silver nanoparticles was investigated using UV-Vis spectroscopy, dynamic light scattering method and the transmission electron microscopy. Particles with average sizes ranging from 14 to 60 nm were obtained. Stability of the process was achieved mainly through the use of 0.5 Tannic acid/AgNO 3 molar ratios and temperature ranging from 20 to 45°C. The proposed technique is consistent with the principles of green chemistry and can be an alternative for traditional nanosilver synthesis.

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“…GNPs of different size were placed on the bottom of the inverse pyramid. The software's built in material parameter set from CRC Handbook of Chemistry and Physics [7] was used for the gold layer and the GNP and that from the Handbook of Optical Constants of Solids I [8], for the silicon substrate. The simulation grid was defined by the built-in auto mesh algorithm with an accuracy level of 3.…”

Section: Determination Of the Near-field Intensity Distributionmentioning

confidence: 99%

“…This can be achieved by selecting an appropriate metal (usually this is gold, silver or copper [7]) and tailoring the size and the shape of its surface. In case of nanoparticles, widely used as SERS agents [8], it was found that the peak of the plasmon resonance is shifting to lower frequencies with size [9]; the use of nanorods instead of spheres allows to create structures with dual plasmons resonance frequencies [10,11]. Colloidal suspensions are also widely used for SERS enhancement, where the size, shape, type or composition of the colloidal structures leads to the tunability of plasmonic resonance [12].…”

Section: Introductionmentioning

confidence: 99%

Enhancement in Inverse Pyramid SERS Substrates with Entrapped Gold Nanoparticles

Rigó¹,

Vereš²,

Himics³

et al. 2019

Preprint

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Giant plasmonic surface enhancement has been observed in gold coated micron sized inverse pyramids entrapping a gold nanoparticle. The amplification of both surface enhanced Raman and photoluminescence signals was found to be dependent on the diameter of trapped gold nanoparticle and around 50-fold enhancement was detected for 250nm diameter sample relatively to the 50nm one. Finite differential time domain simulations, performed to determine the near-field distribution in the structure, showed that when the nanoparticle protrudes into the hotspot zone of the void, coupling of electromagnetic field occurs and the plasmon-related near-field enhancement is concentrated into the close vicinity of the nanoparticle, mainly into the close gaps around the tangential points of the curved sphere and the flat pyramid surface. This results in a more than 15 times increase of the near-field intensity, compared to the empty void.

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Effect of the size of silver nanoparticles on SERS signal enhancement

Cited by 83 publications

References 43 publications

Optimization of microwave-assisted synthesis of silver nanoparticle byCitrus paradisipeel and its application against pathogenic water strain

Optimization of microwave-assisted synthesis of silver nanoparticle byCitrus paradisipeel and its application against pathogenic water strain

Continuous Production of Silver Nanoparticles and Process Control

Enhancement in Inverse Pyramid SERS Substrates with Entrapped Gold Nanoparticles

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