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There are 916 papers published in subject: since this site started.

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	1. Size effect on the magnetism of nanocrystalline Ni films at ambient temperature
	Sun Changqing
	Physics 13 July 2005
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	Abstract:Size effect on the magnetization and the coercivity of nanocrystalline Ni films has been examined at room temperature. Agreement between modeling predictions and measurements reveals that the size-suppressed magnetization results from the drop of spin-spin exchange energy due to the coordination number (CN) imperfection of atoms near the surface edges, and that the size-enhanced coercivity arises from intergrain interaction that is proportional to the inverse of particle size. Findings herewith and reported previously on the size-induced lattice contraction and Curie temperature suppression evidence the significance of atomic CN imperfection on the unusual behavior of a ferromagnetic nanosolid.
	TO cite this article:Sun Changqing. Size effect on the magnetism of nanocrystalline Ni films at ambient temperature[OL].[13 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2439


	2. Dielectric Transition of Nanostructured Diamond Films
	Sun Changqing
	Physics 13 July 2005
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	Abstract:The dielectric behavior of nanostructured diamond films has been investigated by using impedance analyzer up to 500°C. Impedance data are presented in the form of Cole-Cole plot. It is found that: (i) the resistivity contributed both from bulk grain interior and grain boundary decreases with increasing temperature; (ii) above 250°C, the impurities at grain boundaries are thermally activated, and thus contribute to the dielectric relaxation; and (iii) the electrical conductivity of diamond films follows an Arrhenius law with an activation energy transition from 0.13 to 0.67 eV at 250°C. Similar activation energy is found for the Arrhenius plot of relaxation frequencies from 0.14 to 0.73 eV. The dielectric transition is explained as the change of crystal field caused by the thermal expansion or by surface bond contraction of nanosized particles.
	TO cite this article:Sun Changqing. Dielectric Transition of Nanostructured Diamond Films[OL].[13 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2438

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	3. Surfaec and nanosolid core level shift
	Sun Changqing
	Physics 11 July 2005
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	Abstract:Identifying the origin for core-level binding-energy shift induced by surface relaxation or nanosolid formation, and quantifying the crystal binding energy in a bulk solid has been a high challenge. Here we show that a recent bond order-length-strength (BOLS) correlation mechanism allows us to unify the effects of surface relaxation and nanosolid formation on the core-level binding-energy shift into the atomic coordination number (CN) imperfection. A new and simple method has been developed that enables us to elucidate the intra-atomic trapping energy (the core-level position of an isolated atom) and the crystal binding strength (core-level bulk shift) to the core electrons at the energy levels of Si and a number of metals by matching the predictions to the measurements.
	TO cite this article:Sun Changqing. Surfaec and nanosolid core level shift[OL].[11 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2414


	4. The sp-hybrid Bonding of C, N and O to the fcc(001) Surface of Nickel and Rhodium
	Sun Changqing
	Physics 07 July 2005
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	Abstract:A brief review is given focusing on the nature, kinetics, dynamics and consequences of the sp-orbital hybrid bonding of C, N and O to the Ni/Rh(001) surfaces which give rise to the same kind of "radial and then the p4g clock" reconstruction . It is identified that the "radial" and the subsequent "clock" reconstruction result from the adsorbate-substrate bond formation with sp-orbital hybridization and that the driving force behind the reconstruction originates from the electrostatic interaction along the <11> direction.
	TO cite this article:Sun Changqing. The sp-hybrid Bonding of C, N and O to the fcc(001) Surface of Nickel and Rhodium[OL].[ 7 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2391


	5. Oxygen derived DOS features in the valence band of metals
	Sun Changqing,Sean Li
	Physics 07 July 2005
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	Abstract:From the perspective of sp-orbital hybrid bonding and its consequence on the behavior of valence electrons, new insight is presented into the nature of oxygen derived features in the valence band and above of metals. It is suggested that the crystal-geometry and the surface-morphology may vary from surface to surface and from material to material, the oxygen-derived features in energy space are substantially the same in nature. The derived features can be consistently specified as oxygen-metal bonding (- 5 ~ -8 eV), nonbond lone-pair of oxygen (- 1 ~ -2 eV), holes of metal ions (~ EF) and antibondng metal-dipole states (> EF), other than the addition of the 2s or 2p states of the isolated oxygen additives.
	TO cite this article:Sun Changqing,Sean Li. Oxygen derived DOS features in the valence band of metals[OL].[ 7 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2390


	6. Blue shift in photoluminescence of nanosemiconductors
	Sun Changqing,L. K. Pan,B. K. Tay,T. P. Chen,S. Li
	Physics 06 July 2005
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	Abstract:Origin and applications for the PL of nanosemiconductors are discudssed in detail, showing that quntum confinement is nonecessary, instead, surface bond contraction dominates the observations.
	TO cite this article:Sun Changqing,L. K. Pan,B. K. Tay, et al. Blue shift in photoluminescence of nanosemiconductors[OL].[ 6 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2373


	7. Electron-phonon interaction in nanostructures
	Sun Changqing,L. K. Pan
	Physics 05 July 2005
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	Abstract:Correlation between the size-enhanced Stokes shift and the size-enlarged band-gap expansion of porous silicon has been derived, which allows us to discriminate the effect of electron-phonon coupling from the effect of crystal binding on the blue shift in photoemission and photoabsorption of nansolid silicon. Matching predictions to the measured peak shift of both photoemission and absorption and to the measured band-gap expansion evidences the essentiality and validity of the recent bond order-length-strength (BOLS) correlation mechanism which suggests that the atomic coordination imperfection dictates the shape and size dependency of a nanosolid.
	TO cite this article:Sun Changqing,L. K. Pan. Electron-phonon interaction in nanostructures[OL].[ 5 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2367


	8. In verse Hall-Petch relationship in nanostructures
	Sun Changqing,S. Li,C. M. Li
	Physics 04 July 2005
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	Abstract:Temperature, size and bond nature dependence of nanosolid mechanics will be diesussed and qunantified in detail in terms of the recent BOLS correlation mechnism.
	TO cite this article:Sun Changqing,S. Li,C. M. Li. In verse Hall-Petch relationship in nanostructures[OL].[ 4 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2349


	9. Dimension, strength and thermal stability of a single C-C bond in carbon nanotubes
	Sun Changqing,H. L. Bai,B. K. Tay,S. Li,E. Y. Jiang
	Physics 01 July 2005
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	Abstract:Dimension, strength and thermal stability of a single C-C bond in carbon nanotubes
	TO cite this article:Sun Changqing,H. L. Bai,B. K. Tay, et al. Dimension, strength and thermal stability of a single C-C bond in carbon nanotubes [OL].[ 1 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2338


	10. Modulating the work function of carbon by N or O addition and nano-tip fabrication
	Sun Changqing,W.T. Zheng
	Physics 01 July 2005
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	Abstract:A model is presented towards measures lowering the work function for high-efficiency electron emission. It is suggested that an oxide or nitride tetrahedron formation creates nonbonding lone pairs that induce the anti-bonding dipoles associated with density of states that added to a position above the Fermi level and that nano-fabrication could densitify the charges in the confined region due to the coordination number (CN)-imperfection-induced bond contraction. However, over dosing N or O may cause hydrogen-like bond formation with “dipole/+” valence state that could recovers the reduced work function. Closely packed nanotips also recover the work function to that of a flat surface. It is anticipated that the work function of a surface can be lowered by proper co-doping O or N with metals of low-work function to the miniaturized tips. Predictions agree with various experimental observations.
	TO cite this article:Sun Changqing,W.T. Zheng. Modulating the work function of carbon by N or O addition and nano-tip fabrication [OL].[ 1 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2332

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