电工材料
電工材料
전공재료
ELECTRICAL ENGINEERING MATERIALS
2014年
3期
6-9
,共4页
Ag-Pd纳米合金%催化剂%化学还原法
Ag-Pd納米閤金%催化劑%化學還原法
Ag-Pd납미합금%최화제%화학환원법
Ag-Pd alloy%nano-particles%chemical reduction method
利用化学还原法制备Ag-Pd纳米合金颗粒，并用SiO2对其包覆，形成了以Ag-Pd纳米合金颗粒为核、SiO2为壳的核-壳结构的纳米颗粒。采用紫外-可见分光光度计和透射电子显微镜对颗粒的形成过程及形貌尺寸进行了表征。结果表明：利用化学还原法可以获得单分散的球状分布的纳米合金颗粒；反应初期Ag、Pd两种颗粒以物理混合的状态存在，随着反应进行，两种颗粒逐渐合金化，并最终形成Ag-Pd纳米合金颗粒；SiO2可以很好地包覆在纳米颗粒的表面并对其保护。
利用化學還原法製備Ag-Pd納米閤金顆粒，併用SiO2對其包覆，形成瞭以Ag-Pd納米閤金顆粒為覈、SiO2為殼的覈-殼結構的納米顆粒。採用紫外-可見分光光度計和透射電子顯微鏡對顆粒的形成過程及形貌呎吋進行瞭錶徵。結果錶明：利用化學還原法可以穫得單分散的毬狀分佈的納米閤金顆粒；反應初期Ag、Pd兩種顆粒以物理混閤的狀態存在，隨著反應進行，兩種顆粒逐漸閤金化，併最終形成Ag-Pd納米閤金顆粒；SiO2可以很好地包覆在納米顆粒的錶麵併對其保護。
이용화학환원법제비Ag-Pd납미합금과립，병용SiO2대기포복，형성료이Ag-Pd납미합금과립위핵、SiO2위각적핵-각결구적납미과립。채용자외-가견분광광도계화투사전자현미경대과립적형성과정급형모척촌진행료표정。결과표명：이용화학환원법가이획득단분산적구상분포적납미합금과립；반응초기Ag、Pd량충과립이물리혼합적상태존재，수착반응진행，량충과립축점합금화，병최종형성Ag-Pd납미합금과립；SiO2가이흔호지포복재납미과립적표면병대기보호。
The core-shell structure of particles was formed with Ag-Pd bimetal nano-particle synthesized by chemical reduction method as a core and SiO2 as a cladding shell. Formation process, morphology and size of the particles were characterized by the transmission electron microcopy(TEM) and UV-vis absorption spectra. Results show that the spherical monodisperse Ag-Pd nano-particles can be prepared by chemical reduction method. Ag and Pd particles are physical blended in the initial stage. As the reaction progresses, the two kinds of particles are alloyed gradually, and Ag-Pd bimetallic nano-particles will be prepared in the end. The SiO2 well coated on the surface can protect the nano-particles.
