khalaf.ali

Khalaf Ali Fayez Abuamra

استاذ - أستاذ متفرغ

كلية العلوم

العنوان: قسم النبات والميكروبيولوجى -كلية العلوم -جامعة سوهاج

2

إعجاب

المنشورات و المؤلفات التي تحتوي علي الكلمة المفتاحية: power factor


2019-03-23 15:29:53 الكلمات المفتاحية thermoelectric, power factor, Optical , Bi2Te3;, optica, Nanostructures, Bi2Te3,
Optical, Electrical, and Thermoelectric Properties of Hydrothermally Synthesized Bi2Te3 Nanoflakes
Thermoelectric power generators are promising for clean energy production through converting the waste heat to electricity in environmentally friendly ways without any noise or pollutants. This work reports a facile method to synthesize Bi2Te3 nanoflakes with an investigation of their structural, optical, and thermoelectric properties. Various techniques such as X-ray diffraction, field emission scanning electron microscope, transmission electron microscope, and ... إقراء المزيد

2018-11-27 20:19:12 الكلمات المفتاحية power factor, thermoelectricpower, bulk chalcogenides,
Thermoelectric properties of Te doped bulk Bi2Se3 system
PolycrystallinebulksamplesofBi2(Se1−xTex)3systemwithx=0.0–0.9werepreparedbythe conventionalmeltingmethod.Successfullyandcheaply,SeatomswerereplacedbyTeatomstoget Bi2Se3-Bi2Te3orevenBi2Te3alone.DifferenceofmassandsizebetweenTeandSeatomsisexpected toresultininterestingpropertiesintheBi2(Se1−xTex)3system.Allcompoundsshowedametalsemiconductorconductivitytransition.TheelectricalconductioninthepristineBi2Se3compound increaseswiththelowTedopingratio(x=0.3)thendecreasesmonotonicallyforfurtheramountsof Te.TheSeebeckcoefficientofBi2Se3compoundispositiveshowingupap-typeconduction.However, introducingTecontentincreasesthen-typeconductionwithadecreaseintheSeebeckcoefficient absolutevalue.Inaddition,Bi2Se3compoundisfoundtoexhibitrelativelyhighroomtemperature powerfactorandfigureofmeritvaluesof2.13μW/m.k2.Inanattempttodeterminethefigureof meritZT,Bi2Se3seemstobethebestforroomtemperature,whereas,Teadditionathighvaluesmakes thesystemjustsuitableforhightemperatureapplication إقراء المزيد

The electric and thermoelectric properties of Cu(II)-Schiff base nano-complexes
have been widely investigated. However, their thermoelectric (TE) properties remain unreported. This work presents Cu(II)-Schiff base complexes as promising materials for TE power generation. Therefore, three Cu(II)-Schiff base complexes (namely, [Cu(C32H22N4O2)].3 2H2O, [Cu(C23H17N4O7Br)], and [Cu(C27H22N4O8)].H2O) have been synthesized in nanosized scale. The electric and TE properties have been studied and comprehensive discussions have been presented to promote the nano-complexes (NCs) ... إقراء المزيد