资源描述：
《微纳结构银粉的制备及其催化性能研究》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、华中科技大学硕士学位论文浓度为0.21M条件下所得的微纳结构银粉催化性能最好，其表观速率常数Kapp可以达-3-1到9.68×10s，该数值比文献中报道的纳米银的催化性能高10倍，并且比分散剂保护制备的微纳银粉具有更高的催化活性。通过分析结晶度和比表面积对催化性能的影响，发现结晶度对银粉的催化性能有决定性作用。关键词：微纳结构;银粉;形貌;抗坏血酸;催化剂II华中科技大学硕士学位论文AbstractUniformmicro/nano-structuredsilverparticleshaveattractedextensiveattenti
2、onduetotheirimportanceinawiderangeofapplicationsincludingelectronics,catalysis,optics,andsurface-enhancedRamanscattering(SERS).Theseapplicationsareduetotheuniquepropertiesofsilverparticles,whichmainlydependonthemorphologyandsizeofsilverparticles.Themorphologyandsizeofas-ob
3、tainedparticlesareaffectedbysynthesismethodsandconditions.Asaresult,interestinthesynthesisofmicro/nano-structuredsilverparticleshasbeengrowingsteadilyoverthepastdecades.Amongmanysynthesismethods,wetchemicalreductionmethodisprobablythemostpopularoneforitssimplicity,lowcosta
4、ndeasinessofmanipulating.Therefore,wetchemicalreductionmethodwasusedtosynthesizemicro/nano-structuredsilverparticleswithdifferentmorphologiesandsizesinthiswork.Controlledsynthesisofsilverparticleswasinvestigatedbyreducingsilvernitratewithascorbicacid.Wesynthesizednotonlymo
5、no-dispersivesilverparticleswithdispersingagents,suchaspolyvinylpyrrolidone(PVP,K30)andgumarabic,butalsocleansilverparticleswithoutdispersingagents.ThestructureandmorphologyoftheseparticleswereinvestigatedbyX-raydiffraction(XRD),field-emissionscanningelectronmicroscopy(FESE
6、M)andtransmissionelectronmicroscopy(TEM).Theinfluencefactors,suchasreactantconcentrations,reactiontimeandtemperaturewereinvestigated.Thecatalyticactivityofthesemicro/nano-structuredsilverparticleswastestedbycatalyticreductionofp-nitrophenolbysodiumborohydride.Thisworkmainl
7、yincludesthefollowingaspects:PVPandgumarabicwereusedasdispersingagentstosynthesizesilverparticles,respectively.Itwasfoundthatthereactantconcentrationsandreaction,theaddingmethodofgumarabicandreactiontemperatureallhaveimportantinfluencesonthemorphologyandsizeofsilverparticl
8、es.Adjustingtheseparameters,mono-dispersivesilverparticlescouldbecontrollablysynthesized.
