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1. Plasmon Enhanced Visible Light Photocatalytic Activity of Flower-like Au-TiO2 Core-shell Nanoparticles | |||
Youlong Chen,Liang Ma,Xiang-Bai Chen | |||
Physics 14 September 2020 | |||
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Abstract:Flower-like Au-TiO2 core-shell nanoparticles (NPs) were synthesized by a facile and high-yield hydrothermal method in which gold NPs were used as cores and TiF4 was used as precursor. A series of characterizations were carried out to examine the morphology, crystallinity, and composition of the nanostructures. The Au-TiO2 core-shell NPs exhibit uniform flower-like morphology, porous TiO2 shells, and strong surface plasmon resonance (SPR) absorption band in the visible light region. Hence, compared with the hollow TiO2 NPs, the Au-TiO2 core-shell NPs exhibited greatly improved photocatalytic activity for the degradation of methylene blue under visible light irradiation. Such enhancement can be ascribed to the resonant energy transfer and direct electron transfer between TiO2 and Au parts in the core-shell nanostructures. We believe that such plasmonic photosensitizers based on this enhancement mechanism would offer much more flexibility for designing solar energy materials, photocatalysts and other optoelectronic devices. | |||
TO cite this article:Youlong Chen,Liang Ma,Xiang-Bai Chen. Plasmon Enhanced Visible Light Photocatalytic Activity of Flower-like Au-TiO2 Core-shell Nanoparticles[OL].[14 September 2020] http://en.paper.edu.cn/en_releasepaper/content/4752800 |
2. SPR phase detection for measuring the thickness of different thin metal films | |||
Liu Chao,Yue Chong,Qin Zirui,Liu Qinggang | |||
Physics 19 January 2018 | |||
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Abstract:In this paper, a novel method to determine the thickness of different thin metal film is put forward which uses Surface Plasmon Resonance (SPR) phase detection method. The relations between the metal film thickness and the phases of the transverse magnetic (TM) and transverse electric (TE) polarization of the reflected light are shown in the simulation results. By recording the interference patterns which contain the information of the phase differences in the experiments, the values of thickness are calculated. Both of the theoretical analysis and experimental results indicate that the approach presented is feasible and reliable. Thus, it is possible to use the method of phase detection to determine the thickness of different thin metal films in SPR prism couplers directly with nanometer resolution. | |||
TO cite this article:Liu Chao,Yue Chong,Qin Zirui, et al. SPR phase detection for measuring the thickness of different thin metal films[OL].[19 January 2018] http://en.paper.edu.cn/en_releasepaper/content/4743065 |
3. Optical forces in slot plasmonic waveguides | |||
Kang Zhao,Shu Yang | |||
Physics 14 November 2017 | |||
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Abstract:We propose two kinds of pair-structure plasmonic waveguides. Their gap mode properties are studied. It is found that very small mode areas can be obtained. Moreover, we calculate the optical forces that acting on the nanoparticle which is placed in the gap region of pair-structure waveguides. It is found that owing to the strong coupling between the pair structures, a strong local force(as much as more than 4000fN/W) can be generated, which is much stronger than those in most literatures. And the strength and range of the force can be adjusted by the parameters. With these features the pair-structure plasmonic waveguides may be applied as strong and tunable optical tweezers. | |||
TO cite this article:Kang Zhao,Shu Yang. Optical forces in slot plasmonic waveguides[OL].[14 November 2017] http://en.paper.edu.cn/en_releasepaper/content/4742056 |
4. Photoassociation spectroscopy of NaCs molecular long-range states below the (3S1/2) + (6P3/2) limit | |||
LIU Yanyan,WU Jizhou,XIAO Liantuan,MA Jie,JIA Suotang | |||
Physics 27 May 2017 | |||
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Abstract:In this paper, we present high resolution photoassociation spectroscopy of NaCs molecules in long-range state below the Na (3S1/2) + Cs (6P3/2) asymptote. The excited state NaCs molecules are produced by photoassociation of ultracold Na and Cs atoms in a dual-species magneto-optical trap. Trap loss spectroscopy of the ultracold polar NaCs molecules formed by photoassociation, has been experimentally obtained by using highly sensitive modulation spectroscopy technique. PA spectrocopy for c3Σ+ state correlated to Na (3S1/2) + Cs (6P3/2) asymptote is demonstrated and the binding energies of the molecular levels are provided. | |||
TO cite this article:LIU Yanyan,WU Jizhou,XIAO Liantuan, et al. Photoassociation spectroscopy of NaCs molecular long-range states below the (3S1/2) + (6P3/2) limit[OL].[27 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4735855 |
5. The electron transport modulated with phonon in graphene nanoribbons | |||
Yue-Yang Liu,Bo-Lin Li,Shi-Zhang Chen,Ke-Qiu Chen | |||
Physics 09 May 2017 | |||
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Abstract:We observe directly the lattice vibration and its multifold effect on electron/spin transport in zigzag graphene nanoribbons in simulation. Results show that the electron transport fluctuates greatly due to the incessant lattice vibration of the nanoribbons. More interestingly, the phonons behave like a double-edged sword that it boosts the conductance of symmetric zigzag nanoribbons (containing even number of zigzag chains along the width direction) while weakens the conductance of asymmetric nanoribbons. As a result, the spin filter effect that exists in perfect symmetric zigzag graphene nanoribbon is significantly weakened by phonons. Since phonons are usually inevitable in experiments, the research is very meaningful for guiding the realization of theoretical phenomena in experiments or explaining the mismatches between theoretical predictions and experimental results. | |||
TO cite this article:Yue-Yang Liu,Bo-Lin Li,Shi-Zhang Chen, et al. The electron transport modulated with phonon in graphene nanoribbons[OL].[ 9 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4729361 |
6. Effects of contact geometry and nitrogen atoms on the electronic transport properties of Phenazine Compounds | |||
ZHAO Jingfen,ZOU Dongqing,LIU Desheng | |||
Physics 29 April 2017 | |||
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Abstract:By using the nonequilibrium Green's function formalism in combination with the density functional theory, we have studied the electronic transport properties of three phenazine derivatives which are linked to gold electrodes through thiol-gold bonds. We can see that the currents through the top configurations are remarkably larger than that of hollow ones. That is to say, the contact position does affect the electronic transport properties. We also find that the molecule devices exhibited negative differential resistance phenomenon when the metal-molecule contact model is top. The mechanisms are proposed for these phenomena. | |||
TO cite this article:ZHAO Jingfen,ZOU Dongqing,LIU Desheng. Effects of contact geometry and nitrogen atoms on the electronic transport properties of Phenazine Compounds [OL].[29 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725643 |
7. Analysis of a vortex beam in a non-coaxial optical focusing system | |||
Guoxuan Zhu,Yujie Chen,Yanfeng Zhang,Siyuan Yu | |||
Physics 18 April 2017 | |||
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Abstract:In this paper, we analyze an optical beam carrying orbital angular momentum (OAM), i.e. a vortex beam, under the situation where a vortex phase plate (VPP) and a lens are used to generate and focus the vortex beam. A symmetric beam can be expanded into Fourier series in the azimuth frequency (l) space. We use this as a tool to analyze the non-coaxial system. The system efficiency, limited by the transmitting of ring-core fiber, against off-set distance is calculated. With such guidance, we successfully couple the vortex beam into a 1-km-long ring-core fiber. | |||
TO cite this article:Guoxuan Zhu,Yujie Chen,Yanfeng Zhang, et al. Analysis of a vortex beam in a non-coaxial optical focusing system[OL].[18 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725426 |
8. First-Principle Investigations on the Solid Strengthening Mechanism of Si in Cr2AlC | |||
WangRuili,NiuYuan,Xiao Liou | |||
Physics 12 April 2017 | |||
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Abstract:The first-principle method was used to investigate structural, elastic, and electronic properties of Cr2Al1-xSixC (x=0, 0.056, 0.111,0.167) to understand the solid strengthening mechanism. The calculated lattice constant (a and c) of Cr2AlC is in good agreement with the experimental results (within 2%), and the bulk modulus illustrates higher value after the incorporation of Si. Theoretical calculation of electronic properties reveals that the solid solution strengthening in Cr2Al1-xSixC is mainly caused by stronger hybridization bonds between Cr and Si atoms compared with those between Cr and Al atoms, leading to a denser electron charge distribution, higher bulk modulus, and also resulting in higher mechanical properties. | |||
TO cite this article:WangRuili,NiuYuan,Xiao Liou. First-Principle Investigations on the Solid Strengthening Mechanism of Si in Cr2AlC[OL].[12 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4724428 |
9. First Principles Calculations of Electronic Properties on M13Pt42 (M=Al, Ga, In, Mg, Ca, Sr) | |||
RUAN Chengji,CHEN Xi,LI Xuechao,HAN Lihong,ZHANG Chunfang,LU Pengfei,GUAN Pengfei | |||
Physics 20 December 2016 | |||
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Abstract:The structural and electronic properties of the M13Pt42 (M=Al, Ga, In, Mg, Ca, Sr) clusters, in which the core-shell icosahedral M13 substructures are non-transition metal (TM) elements, are investigated by using first-principles method. Our calculations show that Mg13Pt42, Al13Pt42, Ga13Pt42 acted as oxygen reduction reaction (ORR) catalysts is stable while considering both the core-shell interaction energy (Ecs) and the potential energy (Udiss). By analyzing the Partial Density of State (PDOS), we find that it is more favorable to form p-d hybridization than to form d-d hybridization when p-block element cores interact with Pt shell. The absorption energies of O atom show that the adsorption energy of surface is closely related to the charge that the surface gains. Our work may find out new Pt-alloy catalysts for enhancing the ORR activity. | |||
TO cite this article:RUAN Chengji,CHEN Xi,LI Xuechao, et al. First Principles Calculations of Electronic Properties on M13Pt42 (M=Al, Ga, In, Mg, Ca, Sr)[OL].[20 December 2016] http://en.paper.edu.cn/en_releasepaper/content/4714552 |
10. Localized states emission in type-I GaAsSb/AlGaAs multiple quantum wells grown by molecular beam epitaxy | |||
GE Xiaotian,WANG Dengkui,GAO Xian,FANG Xuan,NIU Shouzhu,GAO Hongyi,TANG Jilong,WANG Xiaohua,WEI Zhipeng,CHEN Rui | |||
Physics 27 November 2016 | |||
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Abstract:GaAs0.92Sb0.08/Al0.2Ga0.8As MQWs was grown by molecular beam epitaxy. Temperature and excitation power dependent photoluminescence (PL) of the MQWs were investigated in detail. The PL spectra showed a unique emission evolution. Two competitive peaks were observed from 40 to 90 K in temperature dependent PL spectra. The peak located at low energy shoulder was confirmed to be localized states emission (LE) by the long tail and the inverted S-shaped emission band width obtained from the temperature dependent emission. The high energy side peak was confirmed to be free carrier emission by Varshni equation fitting. It is observed that the LE peak exhibited blue shift with the increase of laser excitation power, which can be ascribed to the band filling effect of localized states. As a result, the localized states in GaAs0.92Sb0.08/Al0.2Ga0.8As MQWs have been confirmed and explained by carrier dynamics. | |||
TO cite this article:GE Xiaotian,WANG Dengkui,GAO Xian, et al. Localized states emission in type-I GaAsSb/AlGaAs multiple quantum wells grown by molecular beam epitaxy[OL].[27 November 2016] http://en.paper.edu.cn/en_releasepaper/content/4711855 |
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