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1. Performance improvement of ZnO based MSM UV photodetectors by Au nanoparticles | |||
LIU Wei,DONG Dayin,AN Yuehua,WANG Shunli,LI Peigang | |||
Physics 28 May 2018 | |||
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Abstract:Localized surface plasmon resonance (LSPR) improved performance of ZnO based metal-semiconductor-metal (MSM) UV photodetectors is demonstrated by Au nanoparticles (Au NPs). The photocurrent has an obvious enhancement compared to the ZnO based MSM UV photodetectors without Au nanoparticles. The absorption spectrum of ZnO film with Au NPs has a LSPR peak at green light range, which is the explanation of the enhancement for the photocurrent. The results provide a way to enhance the photoelectric performance of ZnO based MSM UV photodetectors. | |||
TO cite this article:LIU Wei,DONG Dayin,AN Yuehua, et al. Performance improvement of ZnO based MSM UV photodetectors by Au nanoparticles[OL].[28 May 2018] http://en.paper.edu.cn/en_releasepaper/content/4745301 |
2. Selective Capture and Release of Hepatocellular Carcinoma Cells by Using Aptamer-Conjugated Magnetic Nanoparticles | |||
YU Xiaolei,ZHANG Lingling,GUO Shishang | |||
Physics 18 June 2015 | |||
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Abstract:The detection and study of circulating tumor cells (CTCs) are quite important while also challenging because of the rarity and heterogeneity of CTCs in peripheral blood. Despite the advances of microfluidic techniques improve the capture sensitivity to a certain extent, selectively isolating CTCs with a bias of metastatic potential remains a challenge. Here, aptamer-conjugated magnetic nanoparticles (MNPs) combining a microfluidic platform for selective capture and release of CTCs is demonstrated. The nucleic acid aptamers, which have been screened to target high metastatic hepatocellular carcinoma (HCC) cell line, are conjugated to iron oxide MNPs as capture probe, and the microfluidic chip capable of chaotic mixing and dynamically magnetic separation reaches a final capture efficiency of >60 % toward simulated CTCs spiked in whole blood even at low concentrations. By exonuclease treatment, the isolated HCC cells are further released from the attached MNPs, enabling negligible disruption to cell viability and proliferating functions. Interestingly, the RT-PCR analysis shows relatively higher mRNA expression of cytokeratin 19 toward captured HCC cells than escaped HCC cells, indicating the higher metastatic potential. | |||
TO cite this article:YU Xiaolei,ZHANG Lingling,GUO Shishang. Selective Capture and Release of Hepatocellular Carcinoma Cells by Using Aptamer-Conjugated Magnetic Nanoparticles[OL].[18 June 2015] http://en.paper.edu.cn/en_releasepaper/content/4646332 |
3. Ferromagnetic resonance of transverse domain wall in cylindrical nanowire induced by spin-transfer torque | |||
YIN Yaoyao,LI Zhixiong,WANG Xiguang,NIE Yaozhuang,GUO Guanghua | |||
Physics 20 April 2015 | |||
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Abstract:The excitation of normal oscillation modes of a transverse domain wall in cylindrical nanowire induced by alternating spin-polarized current is studied by using micromagnetic simulations. Several localized normal modes are identified and their features are characterized by mapping the spatial distributions of oscillation. When current flows perpendicular to the wall, the excited modes are localized volume modes, surface modes and surface standing-wave modes. For volume modes, the oscillations are mainly distributed at the wall boundary and wall central areas. The oscillations of the surface and surface standing-wave modes are concentrated at the cylindrical surface. The localization and spatial distribution of the normal modes have a close relationship with the total internal field, especially its inhomogeneity. In the case that the current is parallel to the wall, the wall thickness oscillation mode (or breathing mode) is excited. A new kind of thickness modes, surface thickness oscillation mode, is also observed. Besides, the surface mode and surface standing-wave modes are formed around the circle surface at the center of the domain wall. | |||
TO cite this article:YIN Yaoyao,LI Zhixiong,WANG Xiguang, et al. Ferromagnetic resonance of transverse domain wall in cylindrical nanowire induced by spin-transfer torque[OL].[20 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4639454 |
4. Electrical and electrochemical properties of carbon films made of carbon black nanoparticles | |||
YANG Bingchu,ZHOU Conghua | |||
Physics 10 August 2014 | |||
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Abstract:In this paper, a kind of paste mixed with graphite, carbon black and TiO2 nanoparticles were prepared which was utilized to fabricate the so-called carbon film. With assistance of scanning electron microscope, surface morphological properties of the films were monitored with variance of wt% of carbon black in the system. Meanwhile, electrical and electrochemical performance of the films was also studied. Furthermore, weight loss of carbon black was considered, thus effect of annealing temperature on micro-structural, electrical and electrochemical properties of the carbon films was examined. Sheet resistance of 3 ohm/sq along with charge transfer resistance of 4 ohm*cm2 were achieved for the carbon films fabricated on FTO substrate and annealed at temperature of 200℃. Annealing at higher temperature was found to deteriorate electrical conductivity due to weight loss of carbon black. | |||
TO cite this article:YANG Bingchu,ZHOU Conghua. Electrical and electrochemical properties of carbon films made of carbon black nanoparticles[OL].[10 August 2014] http://en.paper.edu.cn/en_releasepaper/content/4606264 |
5. Preparation of High photocatalytic activity Cd-doped ZnO nanoflowers | |||
ZHAI Yingjiao,LI Jinhua,FANG Xuan,CHEN Xinying,CHU Xueying,FANG Fang,WEI Zhipeng,WANG Xiaohua | |||
Physics 27 September 2013 | |||
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Abstract:With industrial and economic development, global environmental pollution is worsening. Therefore, preparation of high photocatalytic activity Cd-doped ZnO nanoflowers could solve this problem. The ZnO nanoflowers doped with cadmium ions have been prepared by a hydrothermal method and the photocatalytic activities of the asprepared samples for the rhodamine B (RhB) photo-degradation were investigated. The products were characterized by multiple techniques: X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), photoluminescence (PL) spectroscopy, UV-visible spectroscopy and so on. The results manifested the crystal quality of the samples were much weakened on increasing doping concentration from 5 to 20 at%. Then the absorption edge and the UV emission peak of the Cd-doped ZnO nanoflowers shifted to the red. It was also found that the band gap decreased linearly from 3.24 eV to 3.06 eV. Especially, the 5% Cd-doped ZnO nanoflowers showed the highest photocatalytic activity which increased the rate of photocatalytic degradation of rhodamine B (RhB) up to 98% after 3 h of irradiation. So the photocatalytic activities of the 5 percent Cd-doped ZnO nanoflowers are higher than other samples. | |||
TO cite this article:ZHAI Yingjiao,LI Jinhua,FANG Xuan, et al. Preparation of High photocatalytic activity Cd-doped ZnO nanoflowers[OL].[27 September 2013] http://en.paper.edu.cn/en_releasepaper/content/4561869 |
6. Observation of Geometric Phases for Three-Level Systems using NMR Interferometry | |||
Hongwei Chen,Mingguang Hu,Jingling Chen,Jiangfeng Du | |||
Physics 21 January 2009 | |||
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Abstract:Geometric phase independent of energy and time rely only on the geometry of state space. It has been argued to have potential fault tolerance and plays an important role in quantum information and quantum computation. We present the first experiment for producing and measuring an abelian geometric phase shift in a three-level system by using NMR interferometry. In contrast to existing experiments, based on the geometry in evolving space, our experiment concerns the geometric phase associated with SU(3)/U(2) geometry. It also provides a realistic candidate for designing more complex geometric quantum circuits。 | |||
TO cite this article:Hongwei Chen,Mingguang Hu,Jingling Chen, et al. Observation of Geometric Phases for Three-Level Systems using NMR Interferometry[OL].[21 January 2009] http://en.paper.edu.cn/en_releasepaper/content/28168 |
7. Experimental Demonstration of the Unified Framework for the Mixed State Geometric Phase | |||
Jingfeng Du,Mingjun Shi,Jing Zhu,Vlatko Vedral,Xinhua Peng,Dieter Suter | |||
Physics 21 January 2009 | |||
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Abstract:Geometrical phases have been applied in virtually every major branch of physics and they play an important role in topology and knot theory in mathematics and quantum computation. However, most of the early works focus on pure quantum states which are very unrealistic and almost never occur in practice. The two existed definitions -Uhlmann\ | |||
TO cite this article:Jingfeng Du,Mingjun Shi,Jing Zhu, et al. Experimental Demonstration of the Unified Framework for the Mixed State Geometric Phase[OL].[21 January 2009] http://en.paper.edu.cn/en_releasepaper/content/28155 |
8. A new Mechanism for a ripple microstructure formation on surface of brass induced by nanosecond pulse laser | |||
Yongguang Huang,Shibing Liu,Wei Yang,Yuanxing Liu | |||
Physics 12 January 2009 | |||
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Abstract:A new forming mechanism for a ripple microstructure on the surface of brass, which induced by a linear polarized nanosecond pulse laser, is suggested from the plasma electrons quivering motion in laser field. In the interaction of laser generated plasma (gas-phase) and melted brass (liquid-phase), the quivering motion of electrons results inevitable in the distribution of the electronic mass stream density along the laser electric field by which the surface of liquid brass is suffered from a period pressure as well as resulted in a period vorticity in the presupposition of incompressible liquid. After laser pulse the period geometric structure on the surface of liquid brass generated by the period vorticity is retained when the cooling rate of the liquid surface layer is faster than the heat diffusion rate inside the liquid. This present forming mechanism can well explain our experiment phenomenon. | |||
TO cite this article:Yongguang Huang,Shibing Liu,Wei Yang, et al. A new Mechanism for a ripple microstructure formation on surface of brass induced by nanosecond pulse laser[OL].[12 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27616 |
9. 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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