Surface phonon mode absorption in Zn fine particles

AbstractHigh-quality GaP, GaP@GaN and GaN@GaP nanowires were grown by a convenient vapor deposition technique. The wire-like and two-layers structures of GaP@GaN and GaN@GaP core-shell nanowires were clearly resolved using X-ray powder diffraction and high-resolution transmission electron microscopy (HRTEM) and their growth directions were identified. Photoluminescence intensity of GaP@GaN nanowires increased as temperature increased. The result was interpreted by the piezoelectric effect induced from lattice mismatch between two semiconductor layers. An unexpected peak at 386 cm-1 was found in the Raman spectra of GaN@GaP and assigned to a surface phonon mode due to the interface. Detailed synthetic conditions and possible growth mechanisms of those nanowires were proposed.

Download Full-text

Experimental observation of surface phonon absorption in Zn fine particles coated with ZnO

Chinese Science Bulletin ◽

10.1007/bf02882533 ◽

1997 ◽

Vol 42 (1) ◽

pp. 85-86

Author(s):

Jianfeng Xu ◽

Jianrong Zhang ◽

Youwei Du

Keyword(s):

Experimental Observation ◽

Fine Particles ◽

Surface Phonon ◽

Phonon Absorption

Download Full-text

QUANTUM CONFINEMENT OF EMBEDDED COPPER CLUSTER SANDWICHED BY LITHIUM FLUORIDE

Surface Review and Letters ◽

10.1142/s0218625x96002047 ◽

1996 ◽

Vol 03 (01) ◽

pp. 1143-1146 ◽

Cited By ~ 1

Author(s):

G.H. WANG ◽

H.Q. ZHANG ◽

J.X. MA ◽

M. HAN ◽

Q. WANG ◽

...

Keyword(s):

Lithium Fluoride ◽

Quantum Confinement ◽

Phonon Mode ◽

Metal Clusters ◽

Vibrational Modes ◽

Laser Raman ◽

Copper Clusters ◽

Longitudinal Phonon ◽

Surface Phonon Mode ◽

Fcc Structure

Optical absorption and laser Raman scattering spectroscopies as well as EXAFS are used to investigate the copper clusters embedded in the lithium fluoride, and the results indicate that (i) the metal clusters of about 2 nm in diameter have the bulk-like fcc structure with a contracted interatomic distance and lower mean coordination number, (ii) the embedded metal clusters show a surface-plasmon resonance, (iii) for clusters smaller than certain size the surface-phonon mode becomes important, and the high-order longitudinal phonon vibrational modes emerge.

Download Full-text

Cytoplasmic Organization in the Receptor Cells of the Crista Ampullaris

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100093559 ◽

1972 ◽

Vol 30 ◽

pp. 60-61 ◽

Cited By ~ 1

Author(s):

Robert F. Dunn

Keyword(s):

Fine Particles ◽

Apical Cell ◽

Apical Region ◽

Receptor Cells ◽

Cuticular Plate ◽

Morphological Organization ◽

Crista Ampullaris ◽

Cytoplasmic Organization ◽

High Degree ◽

General Appearance

Receptor cells of the cristae in the vestibular labyrinth of the bullfrog, Rana catesbiana, show a high degree of morphological organization. Four specialized regions may be distinguished: the apical region, the supranuclear region, the paranuclear region, and the basilar region.The apical region includes a single kinocilium, approximately 40 stereocilia, and many small microvilli all projecting from the apical cell surface into the lumen of the ampulla. A cuticular plate, located at the base of the stereocilia, contains filamentous attachments of the stereocilia, and has the general appearance of a homogeneous aggregation of fine particles (Fig. 1). An accumulation of mitochondria is located within the cytoplasm basal to the cuticular plate.

Download Full-text

Bright-Field Images (Ctem) of Phase Objects at High Resolution

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100092414 ◽

1976 ◽

Vol 34 ◽

pp. 490-491 ◽

Cited By ~ 1

Author(s):

Sumio Iijima

Keyword(s):

High Resolution ◽

Electron Beam Irradiation ◽

Fine Particles ◽

High Resolution Electron Microscopy ◽

Good Test ◽

Resolution Electron ◽

Single Crystal Films ◽

Crystal Films ◽

By Products ◽

Test Objects

We have developed a technique to prepare thin single crystal films of graphite for use as supporting films for high resolution electron microscopy. As we showed elsewhere (1), these films are completely noiseless and therefore can be used in the observation of phase objects by CTEM, such as single atoms or molecules as a means for overcoming the difficulties because of the background noise which appears with amorphous carbon supporting films, even though they are prepared so as to be less than 20Å thick. Since the graphite films are thinned by reaction with WO3 crystals under electron beam irradiation in the microscope, some small crystallites of WC or WC2 are inevitably left on the films as by-products. These particles are usually found to be over 10-20Å diameter but very fine particles are also formed on the film and these can serve as good test objects for studying the image formation of phase objects.

Download Full-text