Nanowire Research Papers - Academia.edu (original) (raw)

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- Optics, Microfluidics, Nanophotonics, Electronics
- by Yue Wu
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- Catalysis, Transmission Electron Microscopy, Nanowire, Multidisciplinary

We describe a general method for producing ultrahigh-density arrays of aligned metal and semiconductor nanowires and nanowire circuits. The technique is based on translating thin film growth thickness control into planar wire arrays.... more

- by Frederic Diana
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- Nanoelectronics, Science, Nanowire, Multidisciplinary
- by Zongwen Liu
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- Engineering, Protein Purification, Sensor, Drug delivery
- by Tobias Kippenberg
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- Optics, Microfluidics, Nonlinear Optics, Nanophotonics
- by Gerasimos Konstantatos
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- Materials Science, Thermodynamics, Technology, Packaging
- by Davide Peddis
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- Morphology, Nanoparticles, Nanowire, Nanotechnology
- by Theodor Doll
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- Engineering, Optics, Microfluidics, Photonic Crystals
- by Xiuling Li
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- Materials Engineering, Materials Science, Nanowire, Etching
- by Ioan Opris and +1
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- Physiology, Artificial Intelligence, Cancer, Neuroregeneration

We report the fabrication and characterization of surface plasmon (SP)-enhanced blue light-emitting diodes (LEDs) with Ag nanoparticles and SiO2 nano-disks embedded in the p-GaN layer. Compared with LEDs without Ag nanoparticles, the optical output power increases for the SP-enhanced LEDs with and without SiO2 nano-disks are 72% and 49%, respectively. The greater increase in optical output power for the SP-enhanced LEDs with SiO2 nano-disks compared with SP-enhanced LEDs without SiO2 nano-disks can be attributed to the SiO2 nano-disks in the p-GaN layer, which reduce the Ag nanoparticle-induced defects and enhance the light extraction efficiency of the LEDs.

- by Chu-Young Cho
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- Engineering, Optics, Microfluidics, Nanophotonics
- by Mike Shearn
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- Optics, Microfluidics, Nanophotonics, Electronics
- by neophytos neophytou
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- Carbon, Carbon Nanotubes, Nanowire, Nanotechnology
- by Vinay Gupta
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- Engineering, Nanowire, Cyclic Voltammetry, Nanowires
- by Boyan Penkov
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- Engineering, Optics, Microfluidics, Nanophotonics

This letter describes the design, fabrication and characterization of high-oval resonators based on slot waveguide geometries in thin silicon-on-insulator material. Optical quality factors of up to 27 000 were measured in such filters,... more

- by Chris Walker
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- Engineering, Optics, Microfluidics, Nonlinear Optics
- by Erik Menke
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- Nanowire, Multidisciplinary, Sensors, Palladium

We review GaAs and InP nanowires and GaAs based nanowire heterostructures grown on (111)B substrates by metal organic chemical vapor deposition via vapor-liquid-solid (VLS) mechanism. Transmission electron microscopy, time-resolved photoluminescence and micro-Raman spectroscopy have been used to understand the crystal structure, carrier lifetime and strain effects on the bandgap energy.

- by Suriati Paiman
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- Electron Microscopy, III-V Semiconductors, Nanowire, Terahertz spectroscopy
- by Oki Gunawan
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- Engineering, Manufacturing, Solar Cell, Performance
- by xuan chen
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- Engineering, Materials Science, Internet of Things, Nanowire
- by Gerhard Klimeck
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- Materials Science, Nanoelectronics, Reservoir Engineering, Modeling

We demonstrate experimentally that arrays of base-tapered InP nanowires on top of an InP substrate form a broad band and omnidirectional absorbing medium. These characteristics are due to the specific geometry of the nanowires. Almost perfect absorption of light (higher than 97%) occurs in the system. We describe the strong optical absorption by finite-difference time-domain simulations and present the first study of the influence of the geometry of the nanowires on the enhancement of the optical absorption by arrays. Cylindrical nanowires present the highest absorption normalized to the volume fraction of the semiconductor. The absolute absorption in layers of conical nanowires is higher than that in cylindrical nanowires but requires a larger volume fraction of semiconducting material. Base-tapered nanowires, with a cylindrical top and a conical base, represent an intermediate geometry. These results set the basis for an optimized optical design of nanowire solar cells.

- by Olaf Janssen
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- Nanophotonics, Solar Cell, FDTD, Nanowire
- by Bernd Witzigmann
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- FDTD, Nanowire, Finite Element, Electromagnetics
- by Gerhard Klimeck
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- Nanoelectronics, Nanowire, Nanotechnology, Field effect transistors
- by Atul Salvekar
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- Optics, Medical Imaging, Fiber Optics, Microfluidics

The combination of electrodeposition and polymeric templates created by heavy-ion irradiation followed by chemical track etching provides a large variety of poly- and single-crystalline nanowires of controlled size, geometry, composition, and surface morphology. Recent results obtained by our group on the fabrication, characterization and size-dependent properties of nanowires synthesized by this technique are reviewed, including investigations on electrical resistivity, surface plasmon resonances, and thermal instability.

- by Maria Eugenia Toimil-Molares
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- Nanowire
- by Alexey Bezryadin
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- Carbon, Nanofabrication, Carbon Nanotubes, Carbon Nanotube
- by Chris Walker
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- Optics, Microfluidics, Nanophotonics, Electronics
- by Om Gandhi
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- Optics, Microfluidics, Nanophotonics, Electronics

Cathodoluminescence (CL) is a powerful tool for the investigation of optical properties of materials. In recent years, its combination with scanning transmission electron microscopy (STEM) has demonstrated great success in unveiling new physics in the field of plasmonics and quantum emitters. Most of these results were not imaginable even twenty years ago, due to conceptual and technical limitations. The purpose of this review is to present the recent advances that broke these limitations, and the new possibilities offered by the modern STEM-CL technique. We first introduce the different STEM-CL operating modes and the technical specificities in STEM-CL instrumentation. Two main classes of optical excitations, namely the coherent one (typically plasmons) and the incoherent one (typically light emission from quantum emitters) are investigated with STEM-CL. For these two main classes, we describe both the physics of light production under electron beam irradiation and the physical basis for interpreting STEM-CL experiments. We then compare STEM-CL with its better known sister techniques: scanning electron microscope CL, photoluminescence, and electron energy-loss spectroscopy. We finish by comprehensively reviewing recent STEM-CL applications.

- by Victor Sysoev
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- Materials Engineering, Analytical Chemistry, Nanoparticle, Nanowire
- by Geza Toth
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- Water, Hydrogen, Catalysis, Photochemistry
- by Bernhard Boser and +1
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- Materials Engineering, Analytical Chemistry, Nanowire, Nanowires

We developed a facile method to fabricate highly porous Au-embedded WO3 nanowire structures for efficient sensing of CH4 and H2S gases. Highly porous single-wall carbon nanotubes were used as template to fabricate WO3 nanowire structures with high porosity. Gold nanoparticles were decorated on the tungsten nanowires by dipping in HAuCl4 solution, followed by oxidation. The surface morphology, structure, and electrical properties of the fabricated WO3 and Au-embedded WO3 nanowire structures were examined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and current–voltage measurements. Formation of a nanowire structure resulted in significant enhancement in sensing response to H2S and CH4 gases. Furthermore, Au embedment into the WO3 nanowire structures remarkably improved the performance of the sensors. The increase in response performance of sensors and adsorption–desorption kinetic processes on the sensing layers were discussed in relation with the role of Au embedment.

- by Nguyen Minh Vuong
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- Nanowire, Gas Sensors, Gold Nanoparticles, Tungsten Oxide
- by Guy DeRose
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- Optics, Microfluidics, Nanophotonics, Electronics
- by James O. Leckie
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- Water, Catalysis, Carbon, Water Purification

Electrodeposition is emerging as a method for the synthesis of semiconductor thin films and nanostructures. In this work we prepared the nanocrystalline CdTe thin films on indium tin oxide coated glass substrate from aqueous acidic bath at the deposition temperature 50 ± 1 °C. The films were grown potentiostatically from −0.60 V to −0.82 V with respect to saturated calomel reference electrode. The structural, compositional, morphological and optical properties were investigated using X-ray diffraction (XRD), energy dispersive analysis by X-rays (EDAX), atomic force microscopy (AFM), and UV–vis spectroscopy respectively and cyclic voltammetery. The structural and optical studies revealed that films are nanocrystalline in nature and possess cubic phase, also the films are preferentially oriented along the cubic (1 1 1) plane. The effect of cadmium composition on the deposited morphology was also investigated. The size dependent blue shift in the experimentally determined absorption edge has been compared with the theoretical predictions based on the effective mass approximation and tight binding approximation. It is shown that the experimentally determined absorption edges depart from the theoretically calculated values.

- by Diksha Painuly
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- Engineering, Materials Engineering, Semiconductors, Scanning Electron Microscopy
- by BAOLAI LIANG
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- Optics, Microfluidics, Nanophotonics, Electronics
- by Matteo Tonezzer
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- Materials Engineering, Analytical Chemistry, Nanowire
- by Trent Huang
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- Bioinformatics, Genetics, Algorithms, Optics
- by Zongwen Liu
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- Technology, Transmission Electron Microscopy, Nanowire, Nanowires
- by Jonas Ohlsson
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- Nanoelectronics, Nanowire, Comparative Study, Field effect transistors
- by K. Durst
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- Engineering, Optics, Microfluidics, Nanophotonics
- by Bryan M Wong
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- Materials Engineering, Physics, Theoretical Physics, Condensed Matter Physics
- by Chuan Cheng
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- Optics, Microfluidics, Nanophotonics, Electronics

Over the past several years, there has been substantial interest in the application of microring resonator structures as laser sources and as optical filter elements for dense wavelength division multiplexing systems. Here we describe a... more

- by Chris Walker
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- Engineering, Optics, Microfluidics, Nanophotonics
- by Jim Riley
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- Semiconductors, Nanowire, Nanotechnology, LED Lighting

Zinc oxide (ZnO) nanostructures are very attractive in various optoelectronic applications such as light emitting devices. A fabrication process of these ZnO nanostructures which gives a good crystalline quality and being compatible with that of micro-fabrication has significant importance for practical application. In this work ZnO films with different thicknesses were deposited by RF-sputtering on vertically aligned multiwalled carbon nanotube (MWCNTs) template in order to obtain ZnO nanorods. The obtained hybrid structures (ZnO/MWCNTs) were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and time resolved photoluminescence spectroscopy (PL). Results show that the ZnO/MWCNTs have a nanorod structure like morphology with a good crystalline quality of the deposited ZnO on the MWCNTs. PL measurements reveal an enhancement of the band edge signal of ZnO/MWCNTs which is three times of magnitude higher compared to the ZnO film deposited on silicon. Moreover, the intensity enhancement varies as function of the ZnO thickness. Such hybrid structures are promising for optoelectronic application, such as blue–violet sources.

- by Ibrahim Musa
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- Engineering, Technology, Scanning Electron Microscopy, Carbon Nanotube
- by C.Z. Ning
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- Laser, Nanowire, Nanotechnology, Multidisciplinary