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This paper presents the usage of a nanorobotic handling technique for the transfer of individual ZnO-nanowires with diameters of about 100nm and length of up to 10 µm. Handling and assembly are inside the SEM and use a dual-tip approach facilitating an easy controllable three-dimensional positioning of the nanowire. The actual handling sequence works without adhesive bond technique, therefore it operates...
With more and more wearable electronics entering the market, the bottleneck of batteries attracts considerable attentions because of its limited lifetime and energy storage capacity. To solve this problem, triboelectric nanogenerators (TENG) have recently been researched to be applied on harvesting mechanical energy from ambient environment, which is of great significance in the field of energy conversion...
A systematical study of the alignment mismatch caused by the height measurement error in an electron beam lithography system has been performed. The height map error arises when the substrate is transparent or is patterned with optically non-uniform features. A virtual working distance of 23.6 cm has been extracted which allows for an accurate estimate of the importance of height error on misalignment...
In this work we consider the effect of ferroelectric nanodomains on hybrid CH3NH3PbI3 perovskite solar cells. Two-dimensional models of ferroelectric domains are obtained with Metropolis Monte Carlo, considering one effective rotating dipole in each crystal cell. Transport properties of perovskite samples are obtained using drift-diffusion calculations, including local polarization field. We show...
Exploitation of the incoming solar energy is more than adequate to sufficiently meet the energy demands of the modern world. Photovoltaics constitute devices that convert solar energy to electricity. Among them, silicon photovoltaics have been extensively studied, although an emphasis has been given in the last decades towards third generation photovoltaics, such as dye sensitized solar cells (DSSCs)...
Although a variety of carbon nanotube field-effect transistors (CNTFETs) have been successfully fabricated, the contact property between multi-walled carbon nanotubes (MWCNTs) and electrodes is still elusive. In this study, we aims at further characterizing the contact properties among MWCNTs, Au electrode (gold coated glass substrate) and tungsten deposit. First, an atomic force microscope (AFM)...
This work presents an electrostatically tunable field emission tunneling accelerometer fabricated using a single mask fabrication process. A change in the gap between the tunneling electrodes due to acceleration modulates the tunneling current flowing across the device tunable nanoscale gap. The device is shown to follow the Fowler Nordheim principle for field emission tunneling. Sensitivities as...
Quantum dot optoelectronic devices are very attractive for their low power consumption, temperature stability, and high-speed modulation. We developed a defect-less, top-down fabrication process for sub-12-nm diameter InGaN quantum nanodisks (NDs) embedded in GaN barrier by using a combination of a bio-template and neutral beam etching. We have achieved high density of 2.6 × 1011 cm−2 with 6-nm in...
The rapid growing bio-refining industry is hindered by the slow reaction rate of cellobiohydrolase catalyzed hydrolysis. Analysis of the mechanism of enzyme interaction in the cellobiohydrolase catalyzed hydrolysis is difficult because of the variety factors affecting the enzymatic reaction rate. In this study, we evaluated the processive hydrolysis parameters in the molecular level using a video...
This paper reports the design, fabrication, and characterization of a three-dimensional (3D) flow focusing microfluidic mixer. By hydrodynamically focusing the sample into a very confined stream in both vertical and horizontal directions, the mixer can achieve ultrarapid mixing of the sample stream with the reagent streams within ∼3 ± 1 µs, which allows us to study the reaction kinetics on the microsecond...
Large area film of W5O14 nanowires was realized with synthesized by iodine transport method. The field emission characteristics of The W5O14 nanowires were then investigated. The measured samples showed up to 50 µA of emitting current at very low electric field of about 3 V/µm. Furthermore very good stability was achieved, the sample was allowed to emit for more than 70 hours without showing significant...
The effect of reduced graphene electro-catalysts and their the agglomerate sizes, the case in lead acid battery positive active material was done. Reduced graphene size distributions were achieved via shear induced fragmentation of graphene oxide paper followed by hydrazine reduction. Increased size of agglomerates were beneficial when conductive reduced graphene was used as an electro-catalyst, and...
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,...
An elaborate investigation regarding the efficiency of a novel metamaterial-based wireless power transfer (WPT) system, capable of delivering useful energy to the nodes of a nanonetwork, is systematically pursued in this paper. The WPT apparatus incorporates metamaterial fundamental blocks as its elementary resonators to exploit magnetic resonance coupling. The proposed arrangement unveils a noteworthy...
Thick sputtered tantalum (Ta) photonic crystal (PhC) coatings on Inconel were investigated as a potential replacement for bulk refractory metal substrates used for high-temperature emitters and absorbers in thermophotovoltaic energy conversion applications, where high-temperature stability and high reflectance of the surface in the infrared wavelength range are critical in order to sustain high operational...
We propose the use of solution-processed molybdenum disulfide (MoS2) flakes as hole transport layer (HTL) for metal-organic perovskite solar cells. MoS2 bulk crystals are exfoliated in 2-propanol and deposited on perovskite layers by spray coating. We fabricated cells with glass/FTO/compact-TiO2/mesoporous-TiO2/CH3NH3PbI3/spiro-OMeTAD/Au structure and cells with the same structure but with MoS2 flakes...
This work experimentally probes and demonstrates the piezoelectric properties of single-atomic-layer MoS2. MoS2 devices were fabricated on a thin amorphous fused silica substrate, which was bonded to the high-stress location of a tuning fork to maximize the strain and resulting piezoelectric output. The dynamic strain was simultaneously measured in-situ with a commercial semiconductor strain gauge...
Self-supported SiO2 structures were fabricated from thermal SiO2/Si substrates by combining FIB direct writing and selective and anisotropic chemical wet etching of silicon. These structures, such as SiO2 overhangs on the edges of Si trenches, were then used as templates for ALD of Ta2O5 to form sealed nanochannels and cavities. The size of trenches formed by etching through openings in the SiO2 increases...
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...
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