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Your search keyword '"Gao, Yi"' showing total 22 results
Start Over Author "Gao, Yi" Journal modern physics letters b
22 results on '"Gao, Yi"'

20. NOVEL NANOBELTS FORMED BY NANOPARTICLES: SYNTHESIS, CHARACTERIZATION AND OPTICAL PROPERTIES.

Author

DUAN, JUN-HONG, XU, ZHEN-YA, FENG, HAO, and GAO, YI-QING

Subjects
NANOPARTICLE synthesis, NANOPARTICLES, OPTICAL properties, THERMAL analysis, SINGLE crystals, TEMPERATURE effect, GEOMETRIC surfaces, OPTOELECTRONIC devices
Abstract

In this paper, we report a novel nanobelt formed by nanoparticles and prepared by an accurately designed thermal-evaporating method. The nanobelts present single-crystalline characteristic and their zone axis was along crystal direction. Based on TEM images, a proper growth mechanism of nanobelts is proposed. The growth of nanobelts follows three steps: (a) nanoparticles with the diameter of ~ 3 nm were formed by reaction of and atoms at high temperature, (b) nanoparticles aggregated along several specific crystal directions ( and [0001]) and nanobelt with planar surfaces were formed by an oriented attachment growth, (c) nanoparticles were continuously grown on the surface of nanobelt via a homo-epitaxial route. Two Raman peaks (at 299.0 cm-1 and 603.5 cm-1) of the nanobelts shift toward lower frequency compared with the reported works. A symmetrical intensive peak centered at 2.43 eV was observed in PL spectrum of nanobelts. These novel nanobelts show favorable optical emission properties and are promising candidates for future applications in optoelectronic nanodevices. [ABSTRACT FROM AUTHOR]

Published
2013
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21. THE FORMATION AND EVOLUTION OF SINGLE-CRYSTALLINE SnO2 NANOBELTS.

Author

DUAN, JUN-HONG, YAN, CHAO, HE, XING-DAO, GAO, YI-QING, SHI, PEI-QIN, LIU, ZHI-ANG, and JIANG, MANG

Subjects
STANNIC oxide, NANOSTRUCTURED materials, X-ray diffraction, SCANNING electron microscopy, CRYSTAL optics, TRANSMISSION electron microscopy, RAMAN effect, THERMODYNAMICS
Abstract

Single-crystalline SnO2 zigzag nanobelts and straight nanobelts with triangular tip were synthesized by a simple Tin-water reaction method. The product was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman scattering and micro-photoluminescence spectroscopy to obtain the structural and optical information. Why zigzag nanobelts and straight nanobelts can be formed respectively under the same experimental conditions? On the basis of TEM characterization and thermodynamic analysis, the formation mechanism of zigzag nanobelts and straight nanobelts were proposed respectively. [ABSTRACT FROM AUTHOR]

Published
2011
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22. THIRD-ORDER NONLINEAR OPTICAL PROPERTIES OF [(C2H5)4N][Co(dmit)2] USING Z-SCAN TECHNIQUE.

Author

ZHANG, XI, REN, QUAN, GUO, WEN-FENG, SUN, XIANG-BING, WANG, XIN-QIANG, YANG, HONG-LIANG, ZHANG, FU-JUN, GAO, YI, and XU, DONG

Subjects
OPTICAL properties, ABSORPTION, POLARIZABILITY (Electricity), REFRACTION (Optics), OPTICS
Abstract

A novel dmit2- complex: [(C2H5)4N][Co(dmit)2], abbreviated as EtCo, was synthesized and its third-order optical nonlinearities were characterized by Z-scan technique at the wavelength of 1064 nm with laser duration of 40 ps. Z-scan curves revealed a negative nonlinear refraction at 1064 nm and a positive absorption was observed. The nonlinear refraction coefficient n2, the nonlinear absorption coefficient β and the molecular second hyperpolarizability γ have been determined to be as large as 9.51×10-19m2/W, 2.19×10-12 m/W and 5.41×10-31 esu respectively, suggesting that this material has potential applications in optical limiting. [ABSTRACT FROM AUTHOR]

Published
2008
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