Band edge emission enhancement by quadrupole surface plasmon-exciton coupling using direct-contact Ag/ZnO nanospheres

Periodic Ag nanoball (NB) arrays on ZnO hollow nanosphere (HNS) supporting structures were fabricated in a large area by a laser irradiation method. The optimized laser power and spherical supporting structure of ZnO with a certain size and separation were employed to aggregate a sputtering-deposited Ag nano-film into an ordered, large-area, and two dimensional Ag NB array. A significant band edge (BE) emission enhancement of ZnO HNSs was achieved on this Ag NB/ZnO HNS hybrid structure and the mechanism was revealed by further experimental and theoretical analyses. With successfully fabricating the direct-contact structure of a Ag NB on the top of each ZnO HNS, the highly localized quadrupole mode surface plasmon resonance (SPR), realized on the metal NBs in the ultraviolet region, can effectively improve the BE emission of ZnO through strong coupling with the excitons of ZnO. Compared with the dipole mode SPR, the quadrupole mode SPR is insensitive to the metal nanoparticle's size and has a resonance frequency in the BE region of the wide band gap materials, hence, it can be potentially applied in related optoelectronic devices

Solid-state thin film li-ion batteries

Thin film lithium batteries based on polymer electrolytes and solid-state inorganic electrolytes are introduced in this article. We mainly review the progress of the all-solid-state thin film lithium batteries based on inorganic electrolytes, including the preparation methods and the properties of the cathode materials, anode materials and solid-state inorganic electrolytes. The studies on constructions of the thin film lithium batteries are also presented

Enhanced reversible lithium storage in germanium nano-island coated 3D hexagonal bottle-like Si nanorod arrays

MOST of China [2009CB930704]; National Natural Science Foundation of China [61106118]; Science and Technology Project of Fujian Province of China [2013H0046]; Natural Science Foundation of Fujian Province of China [2011J01362]; Fundamental Research Funds for the Central Universities [2011121026]The rapid development of numerous microscale electronic devices, such as smart dust, micro or nano bio-sensors, medical implants and so on, has induced an urgent demand for integratable micro or nano battery supplies with high energy and power densities. In this work, 3D hexagonal bottle-like Si/Ge composite nanorod (NR) array electrodes with good uniformity and mechanical stability potentially used in micro or nano rechargeable Li-ion batteries (LIBs) were fabricated on Si substrates by a cost-effective, wafer scale and Si-compatible process. The optimized Ge nano-islands coated Si NR composite arrays as anode materials exhibit superior areal capacities and cycling performances by virtue of their favourable structural and improved conductivity features. The unique Si-based composite electrode in nanostructures can be technically and fundamentally employed to configurate all-solid-state Li-ion micro-batteries as on-chip power systems integrated into micro-electronic devices such as M/NEMS devices or autonomous wireless microsystems

The structural and electrochemical properties of tin oxide films prepared by RF magnetron sputtering - art no 69842H

Conference Name:6th International Conference on Thin Film Physics and Applications. Conference Address: Shanghai, PEOPLES R CHINA. Time:SEP 25-28, 2007.Tin oxide thin films have been deposited on oxide silicon substrates using a RF magnetron sputtering process with various sputtering power. The crystal structures of the tin oxide thin films were characterized and analyzed by X-ray diffraction. The surface morphology of the films were observed by SEM. The electrochemical properties of the films were also tested by constant current charge and discharge cycle tests. The results of XRD indicate that all the films are crystalline. The results of SEM exhibit that the grain size of surface expands as sputtering power rises

Characteristic of ZnO films prepared by the sol-gel process - art no 69842E

Conference Name:6th International Conference on Thin Film Physics and Applications. Conference Address: Shanghai, PEOPLES R CHINA. Time:SEP 25-28, 2007.ZnO thin films with or without Al doping were grown on the glass substrates by sol-gel method and subsequently annealing treatments at high temperatures were performed to optimize films' morphologies and properties. The crystal structures of ZnO films were characterized by X-ray diffraction (XRD), and XRD spectra show a shift of (002) diffraction peak to the higher 20 values with changing the Al-doping concentration. Optical transmittance spectrums exhibit a sharp absorption edge at around 380nm undergoing a blue shift induced by aluminum doping. An apparent particle size decreasing was displayed by scanning electron microscopy (SEM) images with the Al-doping concentration increasing

Application of V(2)O(5) in thin film microbatteries prepared by RF magnetron sputtering

Conference Name:2nd International Conference on Multi-Functional Materials and Structures. Conference Address: Qingdao, PEOPLES R CHINA. Time:OCT 09-12, 2009.The polycrystalline V(2)O(5) films as the anode in V(2)o(5) /LiPON /LiCoO(2) lithium microbattary were prepared by RF magnetron sputtering system. The V(2)O(5) films' crystal structures, surface morphologies and composition were characterized and analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The microbatteries were fabricated by micro electro-mechanical system (MEMS) technology. The battery active unit area is 500 mu m X 500 mu m, and the thickness of V(2)O(5), LiPON and LiCoO(2) films was estimated to be 200, 610, and 220nm, respectively. The discharge volumetric capacity is between 9.36 mu Ahcm(-2)mu m(-1) and 9.63 mu Ahcm(-2)mu m(-1) after 40 cycles

Ag nanoparticle/ZnO hollow nanosphere arrays: large scale synthesis and surface plasmon resonance effect induced Raman scattering enhancement

National Natural Science Foundation of China [61106118, 61106008]; National Basic Research Program of China (973 programs) [2009CB930704]; Natural Science Foundation of Fujian Province of China [2011J01362, 2010J01343]; Fundamental Research Funds for the Central Universities [2011121026, 2011121042]ZnO hollow nanosphere (HNS) arrays decorated with Ag nanoparticles (NPs) were fabricated on silicon substrates using self-assembled monolayer polystyrene (PS) nanospheres as the template. The O-2 plasma etching was introduced to manipulate the diameters of the ZnO HNSs. This fabrication method has the advantages of simplicity, large scale production, easy size and shape manipulations, low cost and bio-compatibility. Scanning electron microscopy (SEM) images show that the obtained Ag NP-ZnO HNS hybrid structures are hexagonally arranged, with the uniform size and shape, and the X-ray diffraction (XRD) pattern shows that the ZnO HNS arrays are of high crystal quality and have a dominant orientation of direction. Resonant Raman scattering spectra reveal the multiphonon A1 (LO) modes of ZnO hollow nanospheres at 574, 1147 and 1725 cm(-1). Enhanced resonant Raman scattering from the Ag NP modified ZnO HNSs was observed, indicating a strong energy coupling effect located at the metal/semiconductor interface. Surface enhanced Raman scattering (SERS) application for the Ag NP decorated ZnO HNS arrays was verified using a Rhodamine 6G (R6G) chromophore as a standard analyte, which is proved to be an effective SERS template for Raman signal detection. SERS substrates with different structures have been compared, and the Ag NP modified ZnO HNS system exhibits superior Raman scattering enhancements induced by the local surface plasmon resonance (LSPR) effect. The SERS mechanism was well explained by theoretical calculation results. This study is helpful to fabricate controllable Ag NP arrays using the ZnO HNS as the supporting structure and to understand the mechanism of bio-sensing enhancements due to the LSPR effect originated from the metal NPs and metal/semiconductor interface

Cu-doped V2O5 film as anode in V2O 5/LiPON/LiCoO2 lithium microbattery

Conference Name:2011 International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2011. Conference Address: Nanjing, China. Time:June 24, 2011 - June 26, 2011.Nanjing University of Information Science and Technology; Peking University; Fudan University; Tsinghua University; Jilin UniversityThe V2O5 and CuxV2O5 films as the anode of V2O5/LiPON/LiCoO2 lithium microbatteries were prepared by RF magnetron sputtering method. The microbatteries were fabricated by micro electro-mechanical system (MEMS) technology. The films' structures, surface morphologies, and composition were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The microbatteries' cyclic voltammetry and galvanostatic cell cycling measurements were performed. The undoped V2O5 microbattery has capacity of 7.3 nAh in the potential range of 0-3.0 V, while the Cu-doped V2O5 microbattery exhibits better capacity of 9.5 nAh. ? 2011 IEEE