Generation of an ordered layer of silver nanoparticles in mesostructured dielectric films
Generation of an ordered layer of silver nanoparticles in mesostructured dielectric films
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DOI：
10.1007/s11051-009-9794-8
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发表时间：
2010-03
影响因子：
2.5
通讯作者：
Y. Battie;N. Destouches;L. Bois;F. Chassagneux;N. Moncoffre;N. Toulhoat;D. Jamon;Y. Ouerdane;S. Parola;A. Boukenter
中科院分区：
文献类型：
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作者：
Y. Battie;N. Destouches;L. Bois;F. Chassagneux;N. Moncoffre;N. Toulhoat;D. Jamon;Y. Ouerdane;S. Parola;A. Boukenter
介观结构的有机-无机二氧化硅薄膜含有硝酸银被用作模板，以形成有序和致密的银纳米粒子嵌入在介电基质层。杂化二氧化硅膜通过三嵌段共聚物聚环氧乙烷-聚环氧丙烷-聚环氧乙烷（（PEO）106（PPO）70（PEO）106，F127）进行介观结构化，并且含有在沉积之前直接溶解在二氧化硅溶胶中的银前体（AgNO 3）。薄膜与硼氢化钠溶液（NaBH 4）反应，这导致形成平面有序网络的银扁球形纳米颗粒，其具有位于薄膜表面正下方的窄尺寸分布，并通过透射电子显微镜（TEM）观察。短轴和长轴长度分别等于5.3 ± 0.5和7.2 ± 0.6 nm。表征的介观结构的薄膜之前和之后的还原处理的证据，银颗粒生长在介观结构的薄膜的上层中的共聚物胶束的位置。卢瑟福背散射光谱法（RBS）的测量支持的假设，银离子最初分散在膜体积迁移到膜表面，形成单层的银纳米粒子，组织和稳定的共聚物胶束在膜中。红外光谱和椭圆偏振测量被用来表征在混合共聚物-二氧化硅基质的变化。
Mesostructured organic–inorganic silica films containing AgNO3are used as template to form ordered and dense layers of silver nanoparticles embedded in a dielectric matrix. The hybrid silica films are mesostructured by a triblock copolymer polyethylene oxide-polypropylene oxide-polyethylene oxide ((PEO)106(PPO)70(PEO)106, F127) and contain the silver precursor (AgNO3) which is dissolved directly in the silica sol prior to deposition. The films are reacted with a sodium borohydride solution (NaBH4), which leads to the formation of a plane ordered network of silver oblate nanoparticles with a narrow size distribution located just below the film surface, and observed by Transmission Electron Microscopy (TEM). The minor and major axis lengths are equal to 5.3 ± 0.5 and 7.2 ± 0.6 nm, respectively. The characterization of the mesostructured film before and after the reductive treatment evidences that silver particles grow in place of copolymer micelles in the upper layer of the mesostructured thin film. Rutherford Backscattering Spectrometry (RBS) measurements support the hypothesis that silver ions initially dispersed in the film volume migrate toward the film surface to form the monolayer of silver nanoparticles, organized and stabilized by the copolymer micelles in the film. IR and ellipsometric measurements are used to characterize the changes in the hybrid copolymer-silica matrix.