Materials Literature
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A novel 8x8 optical phased array based on high-contrast grating (HCG) all-pass filters (APFs) is experimentally demonstrated with high speed beam steering. Highly efficient phase tuning is achieved by micro-electro-mechanical actuation of the HCG to tune the cavity length of the APFs. Using APF phase-shifters allows a…
The present work examines the stability of a Pt-Co/C catalyst by subjecting it to voltage cycling windows and accelerated stress tests (ASTs), which represent a range of cycling profiles that a fuel cell may experience under automotive conditions. The results indicate that depending on the voltage window selected, per…
We describe the fabrication of a well-defined carbon nanotubes (CNTs)-based composite, in which the CNTs are individually wrapped by a polymer in homogeneous fashion and platinum nanoparticles (Pt) are immobilized on the polymer-wrapped CNTs. Polybenzimidazoles (PBIs) are used for the wrapping polymer since a strong a…
The recent development of low dislocation density Aluminum Nitride (AlN) substrates allows the realization of a new class of majority carrier power devices. Majority carrier devices based on AlxGa1-xN grown on AlN substrates will be able to operate with breakdown voltages in excess of 20KV. A significant challenge to…
In this paper, we report the theoretical and experimental possibility of achieving a quarter-wave plate regime by using high-contrast gratings, which are binary, vertical, periodic, near-wavelength, and two-dimensional high refractive index gratings. Here, we investigate the characteristics of two distinct designs, th…
The interest in quantum dots fluorescence is connected with the problem of implementing new protective luminescence markers and labels. We studied the luminescence spectra of multi-sized quantum dots fluorescent labels and quantum dots fluorescent labels with different matrix pore size.
MPLs play an important role in the water management of PEFCs, but details of the mechanism to suppress water flooding has not been fully understood. In this study, we observed distributions of condensed water at the cross-section surface of the MPL using freezing method and a CRYO-SEM to clarify the effect of the MPL…
Considering the complexity of the electrical behavior (polarization curve and impedance spectrum) of PEFC and the lack of relevant models that could be used to identify the main transport parameters in Membrane Electrode Assemblies (MEA), a semi-analytical pseudo-bidimensionnal model is currently developed. Its main c…
Durability is essential to electrocatalyst for fuel cell application. In this study, electrochemical stability of partially oxidized tantalum carbonitride (Ta-CNO), which is one of non-precious metal electrocatalyst for oxygen reduction reaction, has been investigated. The activity was the most stable around the rest…
All-chemical vapor deposited silicon nitride / monolayer graphene TFTs have been fabricated. Polychromatic Raman spectroscopy shows high quality monolayer graphene channels with uniform coverage and significant interfacial doping at the source-drain contacts. Nominal mobilities of approximately 1900 cm2V-1s-1 have bee…
Dual-gate electrostatic modulation gives an attractive approach for transistors performance improvement and operation mode modulation, which is favorable for chemical sensor and logic applications. Here, self-aligned junctionless semiconducting oxide channels are dual-gate electrostatic modulated by solution-processed…
One of the most prominent nonlinear optical (NLO) material among AIIIBVI class of crystals is GaSe (gallium selenide), which is called by the scientific community in the world as an ″outstanding″ NLO material or material with an ″outstanding″ NLO properties. NLO properties of GaSe has been investigated first in 1972 a…
Stretching of laser pulses allows to improve eximer laser output characteristics and to prolong a laser lifetime. Two methods of laser pumping are proposed in this paper for stretching of laser pulses. Using a special electric circuit in a pumping generator scheme allowed to double a pulse duration for a small ArF-las…
Soft magnetic materials are used in a multitude of applications in magnetic micro electro-mechanical systems (MEMS) such as microsensors or microactuators. The most commonly applied softmagnetic material for microsensor applications is permalloy with a composition of NiFe81/19. This paper investigates the magnetic mat…
Optical nano-materials present a promising platform for targeted molecular imaging of cancer biomarkers and its photodestruction. Our group is investigating the use of polymeric nanoparticles, loaded with indocyanine green, an FDA-approved chromophore, as a theranostic agent for targeted intraoperative optical imaging…
Polybenzimidazole based PEMs have become an important part of research into medium and high temperature PEMFCs. In order for this membrane to function at a high capacity, it must however be impregnated with a strong acid to increase its proton conductivity. The addition of this acid into the polymer leads to a decreas…
Silk-derived activated carbon (SAC) was prepared by steam activation and milling process. SAC yield increased by using milling process instead of steam activation. However, surface area decreased. By ball milling process, nitrogen and oxygen species, which existed inside the as-prepared SAC, appeared at the surface, t…
We report broadband reflectance in the long-wavelength infrared (LWIR, 8-12 μm) utilizing suspended-Si, high-index-contrast subwavelength gratings (HCGs). Iterative design optimization using finite element analysis software has been performed accounting for silicon’s wavelength-dependent index of refraction and extinc…
We have recently fabricated enzyme encapsulated CdTe quantum dot (QDs) hydrogels using the sol-gel method, a versatile way in the QD gel formation. The porous three dimensional QD hydrogel turned out to be an adequate encapsulation medium for enzymes and furthermore, the optoelectronic properties of the individual QDs…
The optical properties of the Au/Al2O3/Ag plasmonic metawaveguide with two-dimensional periodic stub resonators were numerically investigated. The modes of this design can be characterized by the waveguide mode and stub resonance. The guided modes, which propagate inside the Al2O3 layer, can be modulated by interactin…