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简介:CdSe/CdS半导体量点共同敏化TiO2nanorod数组在透明的传导性的做氟的符号的听氧化物(FTO)上被制作使用热水、连续的离子的层吸附和反应(SILAR)过程的底层。样品的结构、词法的性质被X光检查描绘衍射(XRD),地排放扫描电子显微镜学(FESEM),和传播电子显微镜学(TEM)。结果显示CdSe/CdSQD在TiO2nanorods的表面上是一致地涂的。轻吸收边的移动被拿紫外可见的吸收系列监视。与TiO2nanorod数组的吸收系列相比,CdSe/CdSQD的免职转移吸收边到更高的波长。当在量点的co-sensitizers敏化太阳能电池(QDSSC),在CdSe/CdS/TiO2nanorod数组的可见光的区域的提高的轻吸收显示CdSe/CdS层能行动。由优化CdSe层免职周期,5.78mA/cm2的光电流,0.469V的开的电路photovoltage和变换,1.34%的效率在100mw/cm2的照明下面被获得。
简介:ThethermodynamicphasestabilityareadiagramsofBCl3-NH3-SiCl4-H2-ArsystemwereplottedviaFactsagesoftwaretopredictthekineticexperimentalresults.Theeffectsofparameters(ie,partialpressureofreactants,depositiontemperatureandtotalpressure)onthedistributionregionsofsolidphaseproductswereanalyzedbasedonthediagrams.Theresultsshowthat:(a)Solidphaseproductsaremainlyaffectedbydepositiontemperature.TheareaofBN+Si3N4phaseincreaseswiththetemperaturerisingfrom650to900℃,anddecreaseswiththetemperaturerisingfrom900to1200℃;(b)Whentemperatureandtotalpressureareconstants,BN+Si3N4phaseexistsatahighpartialpressureofNH3;(c)Theeffectoftotalsystempressureiscorrelatedtodepositiontemperature.Thetemperaturerangingfrom700to900℃underlowtotalpressureistheoptimumconditionforthedeposition.(d)Appropriatekineticparameterscanbedeterminedbasedontheresultsofthermodynamiccalculation.Si–B–Ncoatingisobtainedvialowpressurechemicalvapordeposition.TheanalysisbyX-rayphotoelectronspectroscopyindicatesthatB–NandSi–Narethemainchemicalbondsofthecoating.
简介:通过溶胶凝胶-熔盐法以NaCl为熔盐制备了掺杂Co^2+的Cd1-xCoxFe2O4(x=0~0.5)尖晶石型铁氧体。利用XRD、SEM和VSM等手段对样品进行了结构、形貌和磁性表征,并详细讨论了Co^2+对Co1-xCdxFe2O4(x=0-0.5)铁氧体结构和磁性的影响。结果表明:在研究范围内掺杂后仍然能得到单相尖晶石结构铁氧体;样品均为正八面体;比饱和磁化强度随x的增大而增加。
简介:FenanowirearraywithstrongshapeanisotropywasemployedasthesoftphaseinNd-Fe-Bbasednanocomposites.TheeffectsoftheFenanowiredistributiononmagneticpropertiesofthenanocompositeswereinvestigatedbymicromagneticsimulation.TheresultsindicatethattheshapeanisotropyofFewiresaddedinthesamedirectionastheuniaxialmagnetocrystallineanisotropyofthehardphasecannotincreasethecoercivityofthenanocomposite.Whenthenanowiresaredistributedperpendiculartotheeasyaxisofthehardphase,theshapeanisotropyofsoftphasecanretardthemomentsfromrotatingtothefullreverseddirection,leadingtoenhancedcoercivity.Inaddition,withincreasingthenanowirediameter,thecoercivityofthenanocompositedecreases,butthedipolarinteractionshowsdifferentrolesinmagneticreversalofnanocompositefordifferentdistributionsofnanowires.ThecurrentresultssuggestthatthecoercivityoftheNd2Fe14B/α-Fenanocompositecanbeenhancedbyintroducingthesoftmagneticnanowirearraywiththediameterlessthantheexchangelengthandwiththelongaxisalongthedirectionotherthantheeasyaxisofhardphase.
简介:Inthepresentpaper,twomodelsbasedonartificialneuralnetworksandgeneticprogrammingforpredictingsplittensilestrengthandpercentageofwaterabsorptionofconcretescontainingZrO2nanoparticleshavebeendevelopedatdifferentagesofcuring.Forbuildingthesemodels,trainingandtestingusingexperimentalresultsfor144specimensproducedwith16differentmixtureproportionswereconducted.Thedatausedinthemultilayerfeedforwardneuralnetworksmodelsandinputvariablesofgeneticprogrammingmodelswerearrangedinaformatofeightinputparametersthatcoverthecementcontent,nanoparticlecontent,aggregatetype,watercontent,theamountofsuperplasticizer,thetypeofcuringmedium,ageofcuringandnumberoftestingtry.Accordingtotheseinputparameters,intheneuralnetworksandgeneticprogrammingmodels,thesplittensilestrengthandpercentageofwaterabsorptionvaluesofconcretescontainingZrO2nanoparticleswerepredicted.ThetrainingandtestingresultsintheneuralnetworkandgeneticprogrammingmodelshaveshownthattwomodelshavestrongpotentialforpredictingthesplittensilestrengthandpercentageofwaterabsorptionvaluesofconcretescontainingZrO2nanoparticles.Ithasbeenfoundthatneuralnetwork(NN)andgeneexpressionprogramming(GEP)modelswillbevalidwithintherangesofvariables.Inneuralnetworksmodel,asthetrainingandtestingendedwhenminimumerrornormofnetworkgained,thebestresultswereobtainedandingeneticprogrammingmodel,when4geneswereselectedtoconstructthemodel,thebestresultswereacquired.Althoughneuralnetworkhavepredictedbetterresults,geneticprogrammingisabletopredictreasonablevalueswithasimplermethodratherthanneuralnetwork.
简介:Theeffectofthehot-chargingtreatmentontheperformanceofAB2andAB5hydrogenstoragealloyelectrodeswasinvestigated.Theresultshowedthatthetreatmentcanmarkedlyimprovethevoltageplateauratio(VPR),thehighratedischargeability(HRDA),thediffusioncoefficientofhydrogenDHandthedischargecapacityoftheAB2hydrogenstoragealloyelectrode.TheSEManalysisshowedthatthehot-chargingtreatmentbringsaboutaNi-richsurfaceduetothedissolutionofZroxides.ItisalsoveryhelpfulfortheimprovementofthekineticpropertiesofAB2hydrogenstoragealloyelectrodebecausethemicrocrackingo.fthesurfaceresultsinfreshsurface.ThiscanbethebasicmodificationtreatmentforNiMHbatteryusedinelectricvehicles(EVs)inthefuture.ButforAB5typealloys,thetreatmenthasthedisadvantageofimpairingthecomprehensiveelectrochemicalproperties,becausethesurfaceofthealloymaybecorrodedduringthetreatment.Themechanismofthesurfacemodificationoftheelectrodeisalsoproposed.
简介:以Pickering乳液液滴为模板,通过液滴表面水合作用制备出MgO/Mg(OH)_2复合空心球壳,通过SEM、XRD等手段进行表征,讨论了空心球壳形成机理,并研究了MgO/Mg(OH)_2复合空心球壳对阿维菌素微胶囊的缓释作用,结果表明,MgO/Mg(OH)_2复合空心球壳形貌完整,粒径分布均匀,平均粒径为62μm。水合过程中部分MgO转变成Mg(OH)_2,并优先复合在未反应的MgO粒子上,形成MgO/Mg(OH)_2复合空心球壳。以MgO/Mg(OH)_2复合空心球壳为壁材的阿维菌素微胶囊具有良好的缓释性能。