单分子膜上诱导沉积纳米金属银膜的研究 - 图文

发布时间 : 星期一 文章单分子膜上诱导沉积纳米金属银膜的研究 - 图文更新完毕开始阅读

天津大学硕士学位论文

单分子膜上诱导沉积纳米金属银膜的研究

姓名:余碧涛申请学位级别:硕士专业:应用化学指导教师:姚素薇

2002.1.1

摘’要’、r一、、J单分子膜瞻导晶体生长为实现从分y-水、}‘控制晶体生长提供厂‘种模式,它突破r以往品体制备中高温条件的限制,仪利_}{j简荦的表向活?陀剂分于,就能够制备具有技术应,H价值的超薄膜。丫。.本论文主耍研究在单分子膜卜-沉积金属,并通过SEM对其进行表钌:。以银氨溶液和酒石酸钾钠溶液作为镀液的主要成分,在气/液界面硬脂酸荦分子膜一卜化学沉积了金属银。论文考察厂溶剂类型、镀液浓度、镀液配比、单分子膜表面压等对银膜质量的影响,确定了最佳实验条件为:银氨溶液浓度为o05mol/L,酒石酸钾钠溶液浓度为015mol/L,一:哲以体积比1:2混合,然后在其上滴加浓度为0lm∥ml硬脂酸的氯仿溶液,单分子膜表lb]压为25mN/m~35mN/m。从SEM照片上I.可以看出,所得银膜表面光滑、细致、均匀。TEM测试结果表明银膜为面心立方结构。控制反应It,JfNJ-r,j以得到纳米辟度银薄膜。实验中发现,当镀液表面无单分f膜椰仃在十‘八醉单分f膜时,镀液表面无银的化学沉积,沉积只发生在带负电性铰强的硬脂酸单分子膜上。通过改变f。八醇和硬脂酸混合成膜物的比例,获得r1i同形貌的银膜。一f通过电沉积_方法在气/液界面硬脂酸学分子膜卜沉积了金属银。、0液断存在硬脂酸单分子膜,阴极以点接触方式轻触单分f膜时,银沿单分j二膜进彳『准二维沉积得到圆形银膜,银膜微观结构为松枝状,并具有多级侧枝生长。论文考察了溶液pH值,单分子膜表面压及槽电压对银膜微观结构的影响,并在十八醇和硬脂酸构成的混合单分子膜上电沉积1r金属银膜。此外在气/固界面硬脂酸单分子膜上化学沉积银,低温时所得银膜较均匀,弓气/液界面单分子膜上沉积银相比,金属光泽较羞。溶解法粗略估计沉积16小时,银膜厚度约为150nm。在气/国界面硬脂酸单分子膜上电沉积银,仍为树枝状结构,但差枝发生弯曲。电沉积和化学沉积方法相结合,可制备出光亮的银膜。丫关键词:单分子膜化学沉积电沉积银膜天津大学硕i学位论文AbstractInthisthesis,metalelectrodepositonmonolayerwasstudiedanditwascharacterizedbySEMAthinAgfilmwasobtainedbyusingstearicacidmonolayerasasupportingsubstrateatair/solutionsurfacethroughelectrolessdepositTheelectr01essdepositsolutiononwhichthemonolayerwasspreadwasaqueoussolutionofAg(NH3)!+andC4H4KNa06BothsolutionoftheAgsaltwithNH40HandthereducingagentwerepreparedinadvanceseperatelyAfterdirectlymixing,thestearicacidsolutionwasspreadonthesurfaceofthesolutionSEMimagesindicatedthatuniformthinmetalAgfilmwasformedattheair/solutioninterfaceTheinfluencesofsolvent,monolayer’Ssurfacepressure,platingbathconcentrationandtheproportionsofplatingbathonthepropertyoftheAgfilmwerestudiedThebestconditionofexperimentwasobtained,thatthesolutionof005mol/LAg(YH3)2’and015mol/LC4HJKNaO^mixedinproportionof12,the0In"l∥mlstearicsolutionwasspreadonthesurfaceofthesolutionusingCHCl3asaspreadingsolvent,andsurfacepressureis25mN/m-35mN/mAshiny,unitbrm,mirrorlikesilverfilmwasobtainedTheelectrondiffractionindicatedthatthesilverfilmiStheface.centeredcubicstructureThesilverfilmwhichthicknessisunder100nanometerscouldbeobtainedbycontrolingdeposittimeIntheexperiment,auniformAgthinfilmdepositedonthenegativelychargedmonolayerofstearicacid,noformationofAgfilmcouldbeobservedintheabsenceofmonolayersoratthemonolayerinterfacespreparedfromC18H370HSobychangingtheproportionsofstearicacidandC18H370H,differentsurfacemorphologyoftheAgfilmcouldbeobtainedAthinAgfilmwasobtainedbyusingstearicacidmonolayerasasupportingsubstrateatair/solutioninterfacethroughelectrodepositElectrochemicalreductionofsilverionsattheinterfaceofstearicacidmonolayerbydot—contactmodeofcathoderesultedinthetwo—dimensionalformationofauniformsilverfilm.whichiSpinebranchstructurewithmanystandingbranchgrowthTheinfluncesofsubphase天津入学硕上学位论文pH,surfacepressureofmonolayerandvoltageonthemicroscopestructureofAgfilmwerestudiedThesilverfilmwasobtainedonthemixturesofstearicacidandClhH370HInaddition,athinAgfilmwasobtainedbyelectr01essdepositonthestearicacidmonolayerataiffsolidinterfaceTheuniformAgfilmobtainedatthelowtemperaturewasuniformandsmoothnessComparedwiththeoneatair/solutionsurface,rioobviousmetalglosswasfoundedItwasestimatedthatthethicknessisl50nanometersorsobydissolutionmethodifdeposittimewas16hoursAthinAgfilmwasobtainedbyelectrodepositonthestearicacidmonolayeratair/solidinterfaceThefilmwaspinebranchstructure,themainbranchiscurvedTheshinyAgfilmcanbeobtainedbythecombinationofelectrolessdepositandelectrodepositKeywords:monolayerdectrotessdepositdectmdepositsilverfIlm

联系合同范文客服:xxxxx#qq.com(#替换为@)