Surface-enhanced Raman scattering of methylene blue adsorbed on cap-shaped silver nanoparticles

Xiao, Guoqing; Man, Shi-Qing

doi:10.1016/j.cplett.2007.09.045

Cited by 309 publications

(221 citation statements)

References 25 publications

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“…3c). On the other hand, when the MB molecules were added into Ag NPs, they absorbed covalently to the surface of Ag NPs through the N-Ag bond [23]. Low concentration of MB affected the surface charges slightly, and the interparticle distances were substantially greater than the average particle diameter.…”

Section: Resultsmentioning

confidence: 97%

Silver–gold core-shell nanoparticles containing methylene blue as SERS labels for probing and imaging of live cells

Guo

Jia

et al. 2012

Microchim Acta

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We report on silver-gold core-shell nanostructures that contain Methylene Blue (MB) at the gold-silver interface. They can be used as reporter molecules in surfaceenhanced Raman scattering (SERS) labels. The labels are stable and have strong SERS activity. TEM imaging revealed that these nanoparticles display bright and dark stripe structures. In addition, these labels can act as probes that can be detected and imaged through the specific Raman signatures of the reporters. We show that such SERS probes can identify cellular structures due to enhanced Raman spectra of intrinsic cellular molecules measured in the local optical fields of the core-shell nanostructures. They also provide structural information on the cellular environment as demonstrated for these nanoparticles as new SERS-active and biocompatible substrates for imaging of live cells.

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Section: Resultsmentioning

confidence: 97%

Silver–gold core-shell nanoparticles containing methylene blue as SERS labels for probing and imaging of live cells

Guo

Jia

et al. 2012

Microchim Acta

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“…[70][71][72] The absorption of methylene blue dye onto gold has shown applications that are of particular interest for the formation of antimicrobial polymers [40] and polymer substrates for SERS. [73] Methylene blue (MB) dye was recently established as a light-activated agent in the lethal photosensitisation of bacteria. [87,88] The light absorbed by the dye generates excited triplet states that interact with oxygen to generate singlet oxygen.…”

Section: Introductionmentioning

confidence: 99%

One‐Pot Synthesis of Core‐Shell Silver‐Gold Nanoparticle Solutions and Their Interaction with Methylene Blue Dye

2011

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A one-pot modified Turkevich synthesis was used to synthesise a range of colloids from pure Ag, through Ag/Au coreshell mixtures to pure Au by the thermal co-addition of trisodium citrate to auric acid and silver nitrate mixtures. The colloids were analysed by means of XRD and wide-beam energy dispersive X-ray (EDX) analysis. The UV/Vis spectroscopy showed a non-linear variation in the surface plasmon resonance band with the Au/Ag ratio, consistent with core-shell formation. High resolution transmission electron microscopy (HRTEM) imaging, in conjunction with thinbeam EDX line analysis, confirmed the presence of predominantly Ag cores and Au exteriors in the Au/Ag mixture. The argon ion sputtering with X-ray photoelectron spectroscopy (XPS) measurements of the particles also indicated a Ag-Au

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“…[30] The 400-1800 region was investigated for MB where characteristic bands are around 1624 cm -1 (C-C stretching), 450 and 504 cm -1 (C-N-C skeletal bending). [31] …”

Section: Morphological and Spectroscopic Characterizationmentioning

confidence: 99%

Metal Nanoparticles Deposited on Porous Silicon Templates as Novel Substrates for SERS

Mikac¹,

Ivanda²,

Gotić³

et al. 2015

Croat. Chem. Acta

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Abstract:In this paper, results on preparation of stable and uniform SERS solid substrates using macroporous silicon (pSi) with deposited silver and gold are presented. Macroporous silicon is produced by anodisation of p-type silicon in hydrofluoric acid. The as prepared pSi is then used as a template for Ag and Au depositions. The noble metals were deposited in three different ways: by immersion in silver nitrate solution, by drop-casting silver colloidal solution and by pulsed laser ablation (PLA). Substrates obtained by different deposition processes were evaluated for SERS efficiency using methylene blue (MB) and rhodamine 6G (R6G) at 514.5, 633 and 785 nm. Using 514.5 nm excitation and R6G the limits of detection (LOD) for macroporous Si samples with noble metal nanostructures obtained by immersion of pSi sample in silver nitrate solution and by applying silver colloidal solution to pSi template were 10 -9 M and 10 -8 M respectively. Using 633 nm laser and MB the most noticeable SERS activity gave pSi samples ablated with 30000 and 45000 laser pulses where the LODs of 10 -10 M were obtained. The detection limit of 10 -10 M was also reached for 4 mA cm -2 -15 min pSi sample, silver ablated with 30000 pulses. Macroporous silicon proved to be a good base for the preparation of SERS substrates.

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Surface-enhanced Raman scattering of methylene blue adsorbed on cap-shaped silver nanoparticles

Cited by 309 publications

References 25 publications

Silver–gold core-shell nanoparticles containing methylene blue as SERS labels for probing and imaging of live cells

Silver–gold core-shell nanoparticles containing methylene blue as SERS labels for probing and imaging of live cells

One‐Pot Synthesis of Core‐Shell Silver‐Gold Nanoparticle Solutions and Their Interaction with Methylene Blue Dye

Metal Nanoparticles Deposited on Porous Silicon Templates as Novel Substrates for SERS

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