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2003-2018 全部
为您找到包含“Nanostructure”的内容共113

Sun Changqing

As consequences of the CN imperfection caused surface bond contraction, desification of charge, mass, and densification and localization of charges happens to the surface skin of a nanosolid, which dictate the tunability of nanostructures in almost all aspects.

2005-08-11

Nanyang Technological University

#Physics#

0评论(0 分享(0)

L. K. Pan,Sun Changqing,L. K. Pan

A combination of the recently developed BOLS correlation [Sun, Phys. Rev B 72m 134301 (2005)] and the new freedom of size has allowed us to elucidate information about the vibration frequency of an isolated Si-SI dimer by match prediction to the measured size dependence of Raman Optical red shift of Si.

2006-04-26

Nanyang Technological University,Nanyang Technological University,Nanyang Technological University

#Physics#

0评论(0 分享(0)

孙长庆

2005-06-28

Miniaturization of a solid forms a new freedom that is fascinating, which allows us not only to tune the physical properties of a solid but also enables us to gain information about the energy levels of an isolated atom and the effect of screening and charge transporting in reaction on the energy level shift, a calibration of crystal binding.

南洋理工大学

#物理学#

0评论(1 分享(0)

Sun Changqing

An analytical solution is presented showing that the dielectric susceptibility of a nanosolid depends functionally on the crystal binding that determine the band gap and hence the essential processes of electron polarization, and on the electron–phonon coupling that is often overlooked in theory considerations. The derived solution covers all the measured values of band gap expansion that is beyond the reach of available approaches. Consistency between predictions and impedance measurements evidences the impact of atomic coordination-number imperfection on the dielectric performance of nanometric semiconductors and the validity of the given solution.

2005-06-23

Nanyang Technological University

#Physics#

0评论(1 分享(0)

Wang Yan,Wang Lingling,Sun Changqing

Analysis of the 2p3/2 core-level shift of Fe surface and nanoparticles based on the bond order-length-strength (BOLS) correlation [Sun CQ, Prog Solid State Chem 35, 1 (2007)] has turned out that the Fe 2p3/2 energy shifts positively by 2.17 eV from the atomic value of 704.52 eV to the bulk of 706.69 eV and that a further 0.32 and 0.16 eV shift occurs, respectively, to the top and the second atomic layers. Consistency between theory and experiments clarifies the dominance of the broken-bond-induced local strain and quantum trapping in perturbing the Hamiltonian and hence the observed Fe 2p3/2 energy shifts.

2009-07-06

Hunan University,Hunan University,School of Electrical & Electronic Engineering, Nanyang Technological University

#Physics#

0评论(1 分享(0)

Sun Changqing, H. L. Bai,S. Li,B. K. Tay,E. Y. Jiang

onsistent insight into the size-enhanced E4f-level shift and the size-suppressed melting point of Au nanosolids has been obtained based on the bond order-length-strength (BOLS) correlation mechanism [Sun, et al, Acta Materialia 51, 4631 (2003)]. Consistency between theory predictions and observations reveals that the atomic-coordination number (CN) imperfection induced bond contraction and the associated bond-energy increase dictate these changes. The increase of binding energy density per unit volume in the relaxed surface region perturbs the Hamiltonian that determines the core level shift; the decrease of atomic cohesive energy (a product of atomic CN and the single bond energy) determines the thermal energy required for melting. Extending the knowledge to the lower end of the size limit suggests that the metallic bond in the gold monatomic-chain contracts by ~30% associated with ~43% magnitude rise of the bond energy. The crystal binding intensity contributing from all the atoms i

2005-08-05

Nanyang Technological University,Tianjin University,Nanyang Technological University,Nanyang Technological University,Tianjin University

#Physics#

0评论(1 分享(0)

林松,戴英

2008-03-18

LB技术以其高致密性、厚度可控、结构可控等特点在纳米组装中被广泛采用,尤其是近来用于一维纳米结构的组装。本文对目前一维纳米结构的组装方法进行了简要概括,综述了LB技术在一维纳米结构组装中的应用,并对其今后的研究进行了展望。

国家自然科学基金(50672072

武汉理工大学材料科学与工程学院,武汉理工大学材料科学与工程学院

#材料科学#

本文收录在《中国科技论文在线精品论文》收录于2008年11月第1卷第14期

0评论(0 分享(0)

王晓明

2011-06-14

目的:为了明确生淀粉糖链结构与糊化淀粉糖链纳米结构的差异;方法:作者用发明的光学单分子图像技术对淀粉糖链的纳米结构进行了研究;结果:生淀粉是由葡萄糖以α糖苷键连接糖链以α萄糖螺旋结构而不断缠结的纳米结构,糊化淀粉局部糖链变成了直链结构,而整个生物大分子变成无规则的直链缠绕结构;结论:非线性光学单分子图像技术是研究生物大分子纳米结构的的非常有效工具

湖北省教育厅项目(D200516013

湖北中医药大学药学院

#化学#

本文收录在中国科技论文在线精品论文,2012,5(7):650-653.

0评论(0 分享(0)

吕扬,张贺秋,胡礼中

2016-07-01

采用化学气相输运方法在蓝宝石衬底上制备了高密度硅纳米结构膜,通过扫描电子显微镜(SEM)对其形貌进行了表征。结果表明这种硅纳米结构膜由交织在一起的硅纳米棒构成,纳米棒长度范围在微米量级,直径约为100nm。利用这种硅纳米结构膜成功地制备了一种酒精传感器,并研究了不同浓度下传感器的传感特性,发现其具有在1s内快速恢复的优点。这种传感器的制作过程简单,成本低廉,在实际应用中具有潜在的价值。

大连理工大学物理与光电工程学院,大连 116024 ,大连理工大学物理与光电工程学院,大连 116024 ,大连理工大学物理与光电工程学院,大连 116024

#物理学#

本文收录在中国科技论文在线精品论文,2016,9(19):2011-2015.

0评论(0 分享(0)

倪东霞,程蓓

2011-05-23

相比于普通二氧化钛纳米颗粒,一维纳米结构二氧化钛更有利于电子的快速传输。本文通过一步水热法合成了具有纳米粒子-纳米棒复合结构的纳米二氧化钛,采用扫描电镜(SEM),X射线衍射(XRD)对其形貌、形成机理及物相结构进行了分析。将该复合结构二氧化钛与商业化二氧化钛-P25均作为光阳极材料来制备染料敏化太阳能电池,对其光电性能进行了对比研究。结果表明,复合结构二氧化钛由于具有较快的电子传输速度等优势而获得比P25较高的短路电流密度和光电转换效率。

武汉理工大学材料科学与工程学院,武汉理工大学材料科学与工程学院

#能源科学技术#

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