Single phase BiFeO3 (BFO) nanoparticles as a visible light photocatalyst were successfully synthesized by thermal decomposition of the glyoxylate precursor. The glyoxylate precursors were formed by the redox reaction between ethylene glycol and nitrate ions. The phase evolution, structure and optical properties of BFO nanoparticles were characterized by X-ray diffraction, electron microscopy an...

Study of the band–gap shift in CdS films: Influence of thermal annealing in different atmospheres. Abstract We study by photoacoustic spectroscopy the band–gap shift effect of CdS films. The CdS films were grown by chemical bath deposi-tion and exposed to different annealing atmospheres over a range of temperature in which the sample structure is observed to change. We show the band–gap evoluti...

the present work deals with the synthesis and characterization of cds nanoparticles with good thermal stability and optical properties by a novel and simple synthetic route. the nanoparticles were synthesized via chemical precipitation method in a single reaction vessel under ambient conditions. the prepared cds nanoparticles were compared with the bulk cds. the optical properties were determin...

A Novel electrical method, using charge-pumping (CP) technique under bias thermal stress (BTS), has been described in this work. This technique is based on the measurement of the flat-band voltage before and after an applied voltage at high temperature through the use of charge-pumping current. The measured flat band shift, that may be due to effect of certain types of the oxide charges, may be...

We report scanning tunneling microscopy and ballistic electron emission microscopy studies of the electronic states of the uncovered and chemisorbed-oxygen covered surface of AlOx tunnel barrier layers. These states change when chemisorbed oxygen ions are moved into the oxide by either flood gun electron bombardment or by thermal annealing. While untreated samples exhibit band tails extending t...

A New electrical method, using charge-pumping (CP) technique under bias thermal stress (BTS), has been described in this paper. This technique is based on the charge-pumping measurement which in turn used to extract the flat-band voltage before and after an applied bias voltage at high temperature. The obtained flat band voltage shift, that is due to redistribution of the mobile ionic charges, ...

Most reported spatially combined or quasioptical amplifier arrays exhibit resonant narrowband performance (<10%) and have not addressed thermal management issues. We report a waveguide-based spatial combining scheme using broadband tapered-slot transitions, capable of realizing full waveguide band coverage (40% fractional bandwidth) with good thermal properties. An X-band prototype using eight ...

12 tracted much attention due to unsur13 passed carrier mobility and high thermal 14 conductivity, 4 combined with excellent 15 chemical and thermal stability down to 16 the nanometer scale. The major drawback 17 is the absence of fundamental band gap, 18 which makes semimetallic graphene unsui19 table for conventional digital logic applica20 tions. Sustained efforts to engineer a band 21 gap i...