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Карпов, С. В.; Bas'ko, A. L.; Popov, A. K.; Slabko, V. V.

doi:10.1023/a:1026626708186

Cited by 16 publications

(9 citation statements)

References 10 publications

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“…Such double-peak structure is typical for small agglomerates, isolated elongated particles, and doublets. 16 As the concentration of tryptophan is the only difference between the samples, we can conclude that tryptophan molecules directly participate in the colloid aggregation and strongly interact with the silver nanoparticles. Thus, we can speculate that the strong enhancement observed in our experiment can be due to the localization of the Trp molecules in the gap between the nanoparticles, where the electromagnetic enhancement reaches its maximum value.…”

Section: Resultsmentioning

confidence: 79%

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Surface-Enhanced Raman Scattering (SERS) Detection of Low Concentrations of Tryptophan Amino Acid in Silver Colloid

2011

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The surface-enhanced Raman scattering (SERS) spectrum of L-tryptophan has been studied in the concentration range 1.4 × 10(-8) to 5 × 10(-4) M. A borohydride-reduced silver colloid was employed as the nanoparticle enhancing agent and different electrolytes have been tested for activation of the colloid. The optimum conditions have been determined for achieving high sensitivity of detection. The experimental procedure developed, which includes the use of a composite electrolyte (a mixture of NaHCO(3) and NaCl) for colloid activation, results in very high enhancement of the Raman signal (up to 10(8)). This gives the possibility of studying SERS spectra of L-tryptophan at concentrations as low as 10(-8) M, which is several orders of magnitude lower than previously reported in the literature. The observed SERS spectra were very reproducible and were detectable 2 minutes after mixing, reaching maximum strength approximately 15 minutes after mixing. The spectral characteristics were stable over the entire period of observation. We have found that SERS spectra of tryptophan in silver colloid differ in several features at low (below ∼10(-5) M) and at high (above ∼10(-4) M) concentrations. The most important difference is the absence of the peak near 1000 cm(-1) at low concentrations, which is usually assigned to the indole ring breathing mode. The observed spectra allow us to suggest that at low concentrations Trp molecules bind to the surface through the indole ring, which remains flat on the surface. This is in contrast to the previously reported observation of SERS spectra from Trp performed at concentration levels above 10(-5) M.

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Section: Resultsmentioning

confidence: 79%

“…Qualitatively the temporal evolution of the absorbance spectra observed in our experiments is very similar to the evolution of the absorbance spectra of the system of two nanoparticles as the particles move towards each other. 16…”

Section: Resultsmentioning

confidence: 99%

Surface-Enhanced Raman Scattering (SERS) Detection of Low Concentrations of Tryptophan Amino Acid in Silver Colloid

2011

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“…The location of this peak in DRS is strongly blueshifted in comparison with the usually registered optical reflection of silver nanoparticles at about 400 nm 17, 28. However, the appearance of a silver absorption–reflection peak at about 320–330 nm with a simultaneous decrease in the intensity of the 400‐nm band is not new and has already been reported 31, 32. In these previous reports, the large blueshift was attributed to the particle size diminution in the silver colloid.…”

Section: Resultsmentioning

confidence: 64%

Ultrasound‐assisted coating of nylon 6,6 with silver nanoparticles and its antibacterial activity

Perkas

Amirian

Dubinsky³

et al. 2007

J of Applied Polymer Sci

111

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A silver/nylon 6,6 nanocomposite containing 1 wt % metallic silver has been produced from an aqueous solution of silver nitrate in the presence of ammonia and ethylene glycol by an ultrasound-assisted reduction method. The structure and properties of nylon 6,6 coated with silver have been characterized with X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray, X-ray photoelectron spectroscopy, Raman spectroscopy, and diffused reflection spectroscopy measurements. The nanocrystals of pure silver, 50-100 nm in size, are finely dispersed on the polymer surface without damaging the nylon 6,6 structure. This silver-nylon nanocomposite is stable to many washing cycles and thus can be used as a master batch for the production of nylon yarn by melting and spinning processes. The fabric knitted from this yarn has shown excellent antimicrobial properties.

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“…This shift strongly depends on the environment of a particle, resulting in an inhomogeneous broadening of absorption band and to the redshift of its maximum accompanied by absorption magnitude decrease (see, e.g. [11]). Redshift of CdTe QDs luminescence maximum observed in our study after 100 min of irradiation evidently is due to the influence of electronynamic interaction within aggregates, too.…”

Section: Introductionmentioning

confidence: 99%

Alteration of the aggregation stability of quantum dots by irradiation

Tsipotan

Aleksandrovsky

Slabko

2017

AIP Conference Proceedings

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The influence of weak irradiation on the aggregation stability of quantum dots is considered. It was shown that under combined UV and visible light irradiation, a gradual increase in spontaneous aggregation takes place, testifying decrease in stabilizing potential barrier height. Thereby, the laser-induced controllable self-assembly of CdTe QDs is recommended to be performed over a time period between 80 and 100 min after the beginning of low intensity irradiation under conditions equivalent to those applied in this study.

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Cited by 16 publications

References 10 publications

Surface-Enhanced Raman Scattering (SERS) Detection of Low Concentrations of Tryptophan Amino Acid in Silver Colloid

Surface-Enhanced Raman Scattering (SERS) Detection of Low Concentrations of Tryptophan Amino Acid in Silver Colloid

Ultrasound‐assisted coating of nylon 6,6 with silver nanoparticles and its antibacterial activity

Alteration of the aggregation stability of quantum dots by irradiation

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