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We investigated the use of the thermal shrinkage of SU-8 resist for applying strain into graphene grown by the chemical-vapor-deposition (CVD) method. We demonstrate that the shrinkage of resist deposited on top of graphene on a substrate induces a local tensile strain within a distance of 1–2 µm from the edge of the resist. The thermal shrinkage of SU-8 allows us to design the local strain in graphene...
Moth-eye, which is the nanoscale tapered pillars array and has a remarkable anti-reflection property, has been paid more attention to be coated on optical materials for high performance anti-reflection surface. However, there are some problems in conventional fabrication method of moth-eye structure, such as labor-intensive mold master for nanoimprint fabrication. In order to overcome these problems,...
In order to reduce the residual strain in multiple quantum wells (MQWs) with an InGaN/GaN heterostructure and enhance the light extraction efficiency of a gallium-nitride-based LED simultaneously, we fabricated a highly periodic multiple quantum well (MQW) nanorod array with an InGaN/GaN heterostructure capable of reducing the residual strain inside the GaN lattice and acting as a two-dimensional...
In this study, Cu-based nanoparticles (Copper oxide (CuO), Copper chromite (CuCr2O4), Copper β-resorcylate (β-Cu)) were prepared in large-scale using wet mechanical grinding method and extracted by vacuum freeze-drying technology. The crystal forms were characterized by X-ray diffraction (XRD) and the particle sizes were analyzed using scanning electron microscopy (SEM) and transmission electron microscopy...
Here we propose that a novel curcumin doped ZnO nanoparticles can be synthesized by a mixture of zinc nitrate and curcumin in the presence of potassium hydroxide. The particles self-assemble to form spindle-like morphologies at ambient condition. The curcumin doped ZnO nanoparticles are similar to ZnO in their scanning electron microscopy images and X-ray diffraction pattern with hexagonal phase diffraction...
Controlled maneuvering of artificial nanomotors in various biological environments can have impactful biomedical applications, such as drug delivery, microsurgery etc. In spite of the various strategies available for the fabrication of nanomotors, practical issues such as toxic fuel requirement, corrosion of the nanomotor and the liquid viscosity has limited their usage to simple bio fluids such as...
Nanotips have attracted increasing interest in several aspects of nanotechnology, particularly in nanotip based microscopy and nano-characterization. Therefore, fabricating nanotips with well-defined shapes and in a highly controllable way is vital. Here we present some characterization analysis of nanotips prepared by the recently developed local electron bombardment method. The nanotip shape is...
We developed a new process for the fabrication of crystalline solar cell, based on an ultrathin silicon membrane, taking advantage of porous silicon technology. The suggested architecture allows the costs reduction of silicon based solar cell reusing the same wafer to produce a great number of membranes. The architectures combines the efficiency of crystalline silicon solar cell, with the great absorption...
Characteristics of photonic crystals are very sensitive to fabrication-induced disorders due to scattering losses. Here, we propose to use atomically flat silicon (111) surfaces, defined by anisotropic wet etching. We theoretically examined the impacts of the surfaces on the novel designs of photonic crystals.
Soft lithography and UV-NIL are important technologies for micro- and nano- structures replication [1]. It is possible to adapt surface structures preparation for many applications regarding e.g. opto-fluidic on-chip microscopy, wetting or reflection properties [2]. Light microscopy has been one of the most common tools in biological research, because of its high resolution and non-invasive nature...
Zinc oxide nanorods have great potential for the realization of high efficiency heterostructure LEDs based on p-doped gallium nitride. In order to obtain a good confinement of the light, a well-aligned nanorod waveguiding structure is desirable. This paper reports on the fabrication of vertical zinc oxide nanorods using a solution-based growth process that does not require a seed layer. The nanorods...
We develop PDMS and PMMA triboelectric surfaces with micro/nanopatterning via simple and effective methods, and starting from Si substrates anisotropically etched with low KOH concentration solution. A hierarchical structure formed by micro-pyramidal structures with superficial nano-roughness, is developed in a 200 µm PDMS layer. In parallel, by means of a PDMS stamp and nanoimprinting technology,...
Applying high intensity electric field (>MV/m), a non-linear measurement of DNA was conducted by impedance spectroscopy. Low alternate voltage was enough to generate high field strength (0.5 MV/m) in the nanometer gap to several micrometer gap and providing non-faradaic condition. With high field strength, DNA was subjected to electrostatic forces, which induced the conformational change and motion...
In this paper, we present a novel method for rapidly fabricating polymeric optical whispering-gallery mode (WGM) resonators. A 3D micro-printing technology based on high-power UV light source and high-speed optical spatial modulator (SLM) is developed, and the fabrication and testing of suspended-toroid WGM resonator array are demonstrated in the experiments. The experimental results reveal that the...
We have experimentally investigated the effect of buffer-dilution on sensing characteristics of the Si-nanowire (Si-NW) ion-sensitive field-effect transistors (ISFETs). Phosphate-buffered saline (PBS) with various buffer concentrations was prepared. The result showed that the sensitivity increases as the buffer concentration decreases for bio-molecule detection, while the pH sensitivity of the Si-NW...
The advent of new methods to optically trigger neural activity has increased the demand for new techniques to deliver light into the brain. However, currently available technologies are limited by the overall invasiveness of optical neural implants. In this work we present a new and minimally invasive technology based on tapered, metal-coated and nanostructured optical fibers, allowing for the customization...
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