In order to prepare Ni clusters embedded in amorphous Si3N4, Ni and Si3N4 layers have been alternatively deposited using sputtering techniques. The nominal Ni layer thickness ranged from 2 to 60 Å and the number of layers was varied accordingly so as to keep the total amount of Ni constant. Extended x-ray-absorption fine-structure EXAFS spectroscopy has been used to study the Ni clustering as w...

FABRICATION AND CHARACTERIZATION OF MICROSTRUCTURE MECHANICAL PROPERTIES NANOCOMPOSITES BASED ON NICRALY ALLOY REINFORCED WITH SI3N4 PARTICLES BY SPARK PLASMA SINTERING METHOD

This research work aims at investigating the influence of a fixed content silicon nitride (Si3N4) and varied contents graphene nanoplatelets (GNPs) on physical (density, structural, morphological) mechanical properties (microhardness, nanoindentation) Al-Si3N4-GNPs composites. The composites were fabricated by microwave-assisted powder metallurgy route. Si3N4 concentration was (5 wt.%) in while...

The increasing demand for sustainable tribology has accelerated the development of environmentally friendly lubrication solutions such as water or water-related lubricants. Earlier works have reported on water-lubricated sliding silicon nitride (Si3N4) at high speeds, which can result in a superlow friction (μ < 0.01) owing to formation hydrodynamic films hydrophilic surface layers. Here, combi...

The enhanced self-phase modulation (SPM) in silicon nitride (Si3N4) and (Si) waveguides integrated with graphene oxide (GO) films is experimentally demonstrated. By using both picosecond femtosecond optical pulses, we observe significant spectral broadening the due to high Kerr nonlinearity of GO films. maximum factors up ~3.4 ~4.3 are achieved GO-coated Si3N4 Si waveguides, respectively. for p...

We report the development of a chemical sensor based on a Co(II) phthalocyanine acrylate polymer (Co(II)Pc-AP) for perchlorate anion detection. We have used two types of transducers, silicon nitride (Si3N4) and hafnium oxide (HfO2). The adhesion of the Co(II)Pc-AP on different transducers and their surface qualities have been studied by contact angle measurements. We have studied the pH effect ...

In an optical interconnect circuit, microring resonators (MRRs) are commonly used in wavelength division multiplexing systems. To make the MRR and laser synchronized, the resonance wavelength of the MRR needs to be thermally controlled, and the power consumption becomes significant with a high-channel count. Here, we demonstrate an athermally synchronized rare-earth-doped laser and MRR. The las...