Low‐Frequency SERS from Ag Colloids in Alkali Halide Crystals

Abel, H.

doi:10.1002/pssb.2221610144

Cited by 6 publications

(2 citation statements)

References 16 publications

(2 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a small nanocrystal with size in the range of a few nanometers to a few tens of nanometers, spatial confinement effects on the electron-hole system and on the propagation of phonon become significant. Due to this confinement, nanoparticles exhibit distinct physical properties which have been studied in the recent past [8][9][10][11][12][13][14][15][16][17][18][19] both experimentally and theoretically. However, at present the information on the fundamental physical properties of such a system is insufficient, and much more information and knowledge is required in order to use them as optical processing devices.…”

Section: Introductionmentioning

confidence: 99%

“…In previous studies, [9][10][11][12][13][14][15][16][17][18][19] special attention has been paid to the lowfrequency Raman scattering from elastic spherical nanoparticles, which vibrate with frequencies inversely proportional to their diameter. A peak in the low-frequency range was observed in Raman scattering from symmetric and quadrupolar acoustic vibrations of these spherical particles, and the particle size was deduced from the energy of this peak.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acoustic vibrations of semiconductor nanocrystals in doped glasses

et al. 1999

View full text Add to dashboard Cite

Polarization-dependent low-frequency off-resonant Raman scattering has been studied from various commercially available filter glass samples, which contain CdS x Se 1Ϫx nanoparticles embedded in a glass matrix. In order to distinguish the confined acoustic phonons from the glass background, the spectra have been compared with those obtained from the base material, which does not contain nanoparticles. Polarized and depolarized scattering from confined acoustic phonons was distinctly resolved near the laser line and overtones of the polarized modes were observed. A theoretical treatment, which establishes a relation between the particle size, the frequencies, and the widths of various phonons, taking into account the matrix influence on the vibrational spectrum and on its damping, is presented. The material-dependent generalized form of this model enables one to use it for any given combination of particle and matrix materials. A good agreement between the experimental and the theoretical results is found. The nanoparticle sizes obtained from Raman scattering agree well with those obtained from transmission electron microscope and anomalous small angle x-ray scattering experiments. ͓S0163-1829͑99͒07231-8͔

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustic vibrations of semiconductor nanocrystals in doped glasses

et al. 1999

View full text Add to dashboard Cite

show abstract

The Continuous Background of SERS from Ag Colloids in Alkali Halide Crystals

Abel

Fischer

1991

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

The continuum background of the SERS spectrum from thermally or photochemically prepared Ag colloids in alkali halide crystals is studied from − 5000 to + 1400 cm−1 and for counting rates covering three decades. The Stokes side consists of three contributions extending to about − 1500, − 3800, and beyond − 5000 cm−1 for 488 nm exciting light. As long as there is no evidence for hot luminescence it may be interpreted as SERS caused by charge‐transfer from the Fermi sea of the silver to mobility states and band‐tail states of the host and to localized surface states of the colloid. The anti‐Stokes intensity of the continuum background is found to follow a Boltzmann law between room temperature and 80 K.

show abstract

Confinement effects on the electronic and vibronic properties of CdS0.65Se0.35 nanoparticles grown by thermal annealing

Verma

Gupta

Abbi

et al. 2000

Journal of Applied Physics

View full text Add to dashboard Cite

CdS 0.65 Se 0.35 nanoparticles are grown in a glass matrix by thermally annealing a base glass material, in which Cd, S, and Se were introduced by diffusion. The starting base material contains no crystalline structure. A comparative study of the confinement effects on the annealed samples using photoluminescence, low-frequency Raman, and optical Raman scattering experiments is presented. Growth of nanoparticles is observed with the three independent experimental techniques as the annealing temperature is varied from 550 to 800 °C. Radii of the thermally grown nanoparticles calculated from the three independent techniques are found to be in good agreement. In addition, surface phonon modes are observed in the optical spectral range, the frequencies of which agree well with those calculated theoretically. As expected from the theory, the positions of the surface phonons are found to be independent of the particle size.

show abstract

Low‐Frequency SERS from Ag Colloids in Alkali Halide Crystals

Cited by 6 publications

References 16 publications

Acoustic vibrations of semiconductor nanocrystals in doped glasses

Acoustic vibrations of semiconductor nanocrystals in doped glasses

The Continuous Background of SERS from Ag Colloids in Alkali Halide Crystals

Confinement effects on the electronic and vibronic properties of CdS0.65Se0.35 nanoparticles grown by thermal annealing

Contact Info

Product

Resources

About