中国材料进展
中國材料進展
중국재료진전
MATERIALS CHINA
2012年
1期
8-12,35
,共6页
吴天斌%张鹏%杨冠英%韩布兴
吳天斌%張鵬%楊冠英%韓佈興
오천빈%장붕%양관영%한포흥
纳米金属%介孔材料%包覆%功能化
納米金屬%介孔材料%包覆%功能化
납미금속%개공재료%포복%공능화
metal nanoparticles%mesoporous materials%encapsulation%functionalization
制备了以SiO2为核、介孔SiO2为壳的核一壳颗粒负载纳米金属颗粒以及介孔SiO2壳层包覆SiO2负载的纳米金属颗粒。结果表明，十六烷基三甲基溴化胺（CTAB）作为模板剂，有助于介孔SiO2壳层包覆SiO2核的结构形成，介孔SiO2壳层的孔径方向垂直于SiO2核的表面；在聚乙烯吡咯烷酮（PVP）的稳定作用下，Pt纳米颗粒能均匀地分布在介孔SiO2壳层的表面。单分散SiO2颗粒经过3-氨丙基三乙氧基硅烷（APS）功能化后，可负载纳米金属颗粒。进一步研究表明，以SiO2负载纳米金属颗粒为核，NH3·H2O，乙醇和水为分散剂，CTAB为模板剂，正硅酸乙酯（TEOS）为硅源，还能制备介孔SiO2壳包覆SiO2负载的纳米金属颗粒，而且介孔SiO：壳层的厚度可通过TEOS的含量调节。
製備瞭以SiO2為覈、介孔SiO2為殼的覈一殼顆粒負載納米金屬顆粒以及介孔SiO2殼層包覆SiO2負載的納米金屬顆粒。結果錶明，十六烷基三甲基溴化胺（CTAB）作為模闆劑，有助于介孔SiO2殼層包覆SiO2覈的結構形成，介孔SiO2殼層的孔徑方嚮垂直于SiO2覈的錶麵；在聚乙烯吡咯烷酮（PVP）的穩定作用下，Pt納米顆粒能均勻地分佈在介孔SiO2殼層的錶麵。單分散SiO2顆粒經過3-氨丙基三乙氧基硅烷（APS）功能化後，可負載納米金屬顆粒。進一步研究錶明，以SiO2負載納米金屬顆粒為覈，NH3·H2O，乙醇和水為分散劑，CTAB為模闆劑，正硅痠乙酯（TEOS）為硅源，還能製備介孔SiO2殼包覆SiO2負載的納米金屬顆粒，而且介孔SiO：殼層的厚度可通過TEOS的含量調節。
제비료이SiO2위핵、개공SiO2위각적핵일각과립부재납미금속과립이급개공SiO2각층포복SiO2부재적납미금속과립。결과표명，십륙완기삼갑기추화알（CTAB）작위모판제，유조우개공SiO2각층포복SiO2핵적결구형성，개공SiO2각층적공경방향수직우SiO2핵적표면；재취을희필각완동（PVP）적은정작용하，Pt납미과립능균균지분포재개공SiO2각층적표면。단분산SiO2과립경과3-안병기삼을양기규완（APS）공능화후，가부재납미금속과립。진일보연구표명，이SiO2부재납미금속과립위핵，NH3·H2O，을순화수위분산제，CTAB위모판제，정규산을지（TEOS）위규원，환능제비개공SiO2각포복SiO2부재적납미금속과립，이차개공SiO：각층적후도가통과TEOS적함량조절。
Metal nanoparticles supported on the core-shell particles with Si02 as core and mesoporous SiO2 as shell and mesoporous SiO2-encapsulated metal nano particles supported on SiO2 particles were prepared in this work. The results showed that SiO2 particles as cores could be coated by mesoporous SiO2 shell with aid of CTAB template and the direction of mesopornus channels was perpendicular to the surface of SiO2 core. Pt nanoparticles could be homogeneously supported on the surface of mesoporous SiO2 shell with aid of PVP. SiO2 particles functionalized with APS could support metal nanoparti- cles. The further study indicated that the mesoporous SiO2-encapsulated metal nanopartictes supported on SiO2 particles could be prepared with SiO2 particles-supported metal nanoparticles as cores, NH3 ·H2O, ethanol and water as dispersant, CTAB as template and TEOS silica precursor. It was also found that the thickness of mesoporous SiO2 shell could he controlled by the content of TEOS.
