納米結(jié)構(gòu)銀塊體材料和納米銀-活性炭介孔復(fù)合體的電阻特性研究.pdf

1、中國(guó)科學(xué)技術(shù)大學(xué)碩士學(xué)位論文納米結(jié)構(gòu)銀塊體材料和納米銀活性炭介孔復(fù)合體的電阻特性研究姓名：劉予雙申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：凝聚態(tài)物理指導(dǎo)教師：牟季美19990501PropertiesofResistanceofNanostructuredAgBulksandNanoAg／Activated—carbonmesoporouscompositeABSTRACTThesamplesofdifferentaverageparticlediame

2、tersandaveragegraindiametersofnanostructuredAgbulksandnanoAg／activatedcarboncompositeswithdifferentamountofnano‘Agparticleswereprepared，TheresistanceofnanostructuredAgbulksandnanoAg／activated—carbonmesoporouscompositewas

3、investigatedbymeansofclassicalfour—probetechniqueAccordingtotheXraydiffractionfXRD、spectraandthe疊otographsoftransmissionelectronmicroscopy(TEM)，theaverageparticleandgraindiameterswerecalculatedTheresultsarelistedbellow：1

4、Forthemeasuringtemperature(Tm)≤roomtemperature，whentheaveragegraindiameter(de)andtheaverageparticlediameter(dp)aresmallerorequalto11andt8nm，respectivelyandforTmroomtemperature，whendcanddparesmallerorequalto12nmand20nm，re

5、spectivelytheresistanceofnanostmctruedAgbulksfallswithincreasingtemperature，thatis，thetemperaturecoefficientofresistivity(Ⅱ)changesfrompositivetonegative。Thisiscompletelydifferentfromthatoftherelativelypurecoarsemetalswh

6、oseresistivity(orresistance)increaselinearlywithincreasingtemperature(Matthissen’srule)2。Usetheoriessuchasdisorderedelectronicsystems，thequantumsizeeffect，thesaturationeffectofresistivitytoanalysistheabnormalphenomenaofn

7、egativetemperaturecoefficientofresistivityinacreativeway3ForTm≤roomtemperaturewhendeanddparesmallerorequalto1lnmand18nm，respectively程becomesnegative，butforTmroomtemperaturenegative程appearsatlargerdpanddc(20and119nm，respe