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Semiconductor nanowires (NWs) are ideal to investigate the fundamental science of reduced dimensionality and size, and are also building blocks for devices in the proposed bottom-up paradigm. Controllable growth of NWs with desired properties and functionalities is the cornerstone to realize these applications. In this letter, we report that the reactant molecules impinged on the seed nanoparticles...
New dielectric-engineering concept is developed intending a net improvement of the performance of dielectric layers under electrical stress. Instead of synthesis of new dielectric materials a new class of dielectric layers that gain their performance from design rather than from composition is established. Two kinds of nanostructured dielectric layers are presented here: (i) silicon oxynitride layers...
Nanoscaled self-assemblies of conjugated polymers with tunable electronic and optical properties serves as fantastic interfacial layer to facilitate electron (hole) transfer across donor acceptor interface that leads to 60% improvement in power conversion efficiency. The manuscript aim at revealing the synthesis and characterization of these novel conjugated oligomer and how they come together to...
Design and fabrication of photon induced, negative capacitance in a Metal Oxide Semiconductor (MOS) capacitor is presented, where a non-ferroelectric material serves as the gate dielectric. The underlying device physics involves states at the semiconductor-oxide interface, coupled with the injection of photo-generated electrons. This forces the otherwise increasing surface potential to decrease in...
The aggressive scaling of CMOS circuits is approaching the atomic and quantum physical limits [1], and therefore extensive research is being conducted on devices made with III-V and II-VI semiconductors, and with more exotic materials like grapheme, and various nanotubes.
Heterostructures made out of 2D materials are being actively investigated for a variety of device applications. In this work, we discuss recent results on modeling electrical transport through graphene — Boron Nitride (BN) — graphene heterostructures. The main result is that there are two potential mechanisms for negative differential resistance (NDR). We also show how the increase in BN layers changes...
The mechanical behavior of thin suspended graphite membranes (thickness of about 100 nm) has been investigated by a method utilizing Laser Photoacoustic Absorption Spectroscopy (PAS). Membranes prepared by multiple mechanical cleavage of highly ordered pyrolytic graphite (HOPG) were attached to a glass window with circular opening (diameter 4 mm). The movement of the membranes was induced by pressure...
We demonstrate a new application of polyurea aerogels for efficient loading and uniformly slow release of insect repellents for lasting mosquitos avoidance. Loading of 6–10 times w/w was achieved for aerogel of 80–250 mg/cm3. Ultra-slow and uniform release rate of 2% of repellents per day was achieved, equivalent over 40 days release time, indicating a strong potential of aerogel for effective insect-repellent...
Photovoltaic solar cells have been spotlighted with the growing demands of green and clean energy. Especially, since Oregan and Gratzel reported mesoporous TiO2 electrode dye sensitized solar cells (DSSCs) in 1991, the related works have been widely reported for the enhanced performance. Dyes with high adsorption coefficient and electrolyte with more stability need to be considered for improving DSSCs...
This paper presents electronic conductivity measurements from three different types of sub-micron scale carbon nanoparticles, each of which is sourced from Lignin. The particles are synthesized using a combination of hydrothermal and high-temperature processing steps involving suitable catalysts. The synthesis parameters are found to have an impact on the extent of graphitization within the carbon...
We demonstrate efficient polymer solar cells made from large molecular weight (MW) poly(3-hexylthiophene-2,5-diyl) (P3HT) nanostructures made by nanoimprint lithography (NIL). We found NIL allows the polymer with higher MW (> 40 kDa) to organize more strongly than lower MW, which is desired for efficient charge transport but difficult to achieve previously. Solar cells with large MW P3HT nanogratings...
Photoconductivity of intrinsic graphene in vacuum and functionalized high resistivity graphene as an effective passivation layer for surface enhanced Raman scattering in harsh environments are reported and discussed.
Nanostructures, with one or more dimensions in the lOOnm size range, exhibit a variety of unique and tunable chemical and physical properties when engineered appropriately. The high degree of variability in size and surface chemistry of nano-scale materials in coatings, crystal structure, shape and composition used in growing layered MoS2 and nanostructures increase both their complexity and the multiple...
We report on the mechanism of emission quenching for InGaN/GaN quantum-disks in nanowires heterostructure grown catalyst-free using plasma-assisted molecular beam epitaxy. Temperature-dependent photoluminescence measurement shows the existence of blue and green emission spectra, with the blue peak quenched at room temperature. Characterization results suggest that the quenching is caused by the presence...
We demonstrate an electric cell substrate impedance sensing system (ECIS) based on vertically aligned carbon nanofibers (VACNF). The nanofibers having an average length of 4.45 μm are deterministically fabricated on transparent quartz substrates and are examined using SEM. Bovine aortic smooth muscle cells cultured on the VACNF ECIS system over a 10 hour period show a change in measured impedance...
Graphene nanoribbon has altered the perspective of future electronics device industries. Post silicon based technology, Graphene nanoribbon is now considered the most promoting materials for the next generation electronics. Armchair graphene nanoribbon is one of two prototypes of graphene which is widely known for its semiconducting properties limited by width length below 50nm. However, some of the...
We show that 3D-integrated perpendicular Nanomagnetic Logic (pNML) is highly suitable for the demands of systolic array-based computing. Architecture, signal processing and electrical integration of 3D pNML devices into CMOS integrated circuits (ICs) is discussed. A runtime-programmable arithmetic logic unit (ALU) made from field-coupled magnets and applicable for pipelined and massively parallel...
The theoretical vibrational spectrum, oxygen bond dissociation energies (BDE), atomic charges and hydrogen bonding has been investigated using wB97XD/6-31g(d) method of calculation. The order of BDE for C-O comes in the ascending order starting from hydroxyl group above or below the graphene sheet, one of the epoxy bridge bonds, phenolic, OH of carboxylic acid, hydroxyl groups on the terminals, and...
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