Synthesis and characterization of silver colloidal nanoparticles with different coatings for SERS application

Mikac, Lara; Ivanda, Mile; Gotić, Marijan; Mihelj, Tea; Horvat, Lucija

doi:10.1007/s11051-014-2748-9

Cited by 75 publications

(63 citation statements)

References 29 publications

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“…The average size of the nanoparticles in this colloid solution was 17 nm. [26] PULSED LASER ABLATION (PLA) Silver and gold nanoparticles have been grown by pulsed laser ablation of solid targets in presence of a controlled Ar atmosphere. The deposition conditions adopted in this work were chosen on previous studies using a KrF excimer laser (λ = 248 nm, pulse width 25 ns, repetition rate 10 Hz).…”

Section: Drop Casting Of the Colloidal Solutionmentioning

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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Section: Drop Casting Of the Colloidal Solutionmentioning

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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“…Silver was deposited on the surface of pSi by immersing the pSi Figure 1. SERS spectra of pyridine in citrate-reduced Ag colloid sample recorded one after another during 25 minutes after addition of 0.1M NaBH4 (the highest peak represents the longest time) [19]. The absorption optical spectra of silver samples were recorded using UV-Vis-NIR spectrophotometer (UV-3600, Shimadzu).…”

Section: Methodsmentioning

confidence: 99%

“…They were investigated with respect to nanoparticles morphology and SERS activity [19]. The silver particles with 10-40 nm size and spherical shape were prepared by reducing silver nitrate with citrate, ascorbic acid and NaBH4 in the presence of stabilizing agents.…”

Section: A Sers In Colloidal Solutionsmentioning

confidence: 99%

Preparation and characterization of SERS substrates: From colloids to solid substrates

Mikac

Ivanda

Gotić

et al. 2015

2015 38th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO)

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Surface enhanced Raman spectroscopy is an important technique for detection of wide number of analytes. Today, there is a growing need for the development of stable, sensitive, reproducible and portable SERS-active substrates for use in different fields. Some of the most extensively used SERS substrates are metal colloids. However, the use of the colloid solutions for SERS deals with important issues, like stability and reproducibility. Other popular types of substrates are rough or nanoporous surfaces, such as porous silicon, coated with noble metals. Porous silicon (pSi) is a semiconducting material typically obtained by electrochemical etching in hydrofluoric acid (HF). Due to its high surface-tovolume ratio pSi is an interesting material for photonic and sensing devices, drug delivery systems as well as for use in SERS. In this paper, attempts are made to prepare a stable and uniform noble metal colloidal solution as well as solid substrate using porous silicon (pSi) with deposited silver and gold nanostructures. SERS substrates obtained by different methods are evaluated for SERS efficiency using methylene blue and rhodamine 6G (R6G) at 514.5 and 633 nm. The prepared substrates showed good stability and reproducibility. For some substrates the concentrations detected were below nanomolar range.

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“…Except for stabilization of the metallic nanoparticles in the suspension, the surface coatings is of the utmost importance for the adsorption of the molecules on the colloidal nanoparticles. [8] If colloidal nanoparticles and molecules had charges of the same sign, adsorption process could be strongly hindered, or even completely prevented.…”

Section: Introductionmentioning

confidence: 99%

Surface-enhanced Raman Scattering Enhancement Factors for RNA Mononucleotides on Silver Nanoparticles

Miljanić¹,

Ratkaj²,

Avdejev³

et al. 2015

Croat. Chem. Acta

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Surface-enhanced Raman scattering (SERS) enhancement factors (EF) were evaluated for RNA mononucleotides: adenosine 5'-monophosphate (AMP), guanosine 5'-monophosphate (GMP), cytidine 5'-monophosphate (CMP) and uridine 5'-monophosphate (UMP), on silver nanoparticles, which differed in shape (nanospheres, nanostars) and stabilizing anionic layer (chlorides, citrates) on the metal surface. In freshly prepared silver colloids the enhanced Raman scattering was observed for all the RNA mononucleotides on the chloride coated silver nanospheres, Ag_Cl nsp (EF ≈ 10 4 ), for AMP only on the citrate coated silver nanospheres, Ag_cit nsp (EF ≈ 10 3 ), while not obtained at all for any of the mononucleotides on the citrate stabilized silver nanostars, Ag_cit nst. Upon aggregation, the SERS activity of all the silver colloids increased, whereby the purine mononucleotides, AMP and GMP, more strongly scattered radiation on Ag_Cl nsp, and the pyrimidine mononucleotides, CMP and UMP, on Ag_cit nsp. Regardless of the silver nanoparticles, the higher EFs were evaluated for AMP and GMP (EF up to 5 × 10 6 ), than for CMP and UMP (EF ≈ 5 × 10 4 ).

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Synthesis and characterization of silver colloidal nanoparticles with different coatings for SERS application

Cited by 75 publications

References 29 publications

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

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

Preparation and characterization of SERS substrates: From colloids to solid substrates

Surface-enhanced Raman Scattering Enhancement Factors for RNA Mononucleotides on Silver Nanoparticles

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