Hierarchical Self-assembly of Silver Nanocluster Arrays on Triblock Copolymer Templates

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• 作者：Zhongtao Shi ; Min Han ; Fengqi Song ; Jianfeng Zhou ; Jianguo Wan ; Guanghou Wang
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：September 21, 2006
• 年：2006
• 卷：110
• 期：37
• 页码：18154 - 18157
• 全文大小：231K
• 年卷期：v.110,no.37(September 21, 2006)
• ISSN：1520-5207

文摘

Poly(styrene-b-butadiene-b-styrene) (SBS) triblock copolymer templates which present in-plane cylinders ofpolystyrene (PS) aligned parallel to the plane of the substrate have been prepared by a solvent-induced order-disorder phase transition method. Silver nanoclusters have been obliquely deposited onto the SBS copolymertemplates at low coverage, utilizing the directed low-energy cluster beam deposition (LECBD) method. Themorphology of the samples has been characterized by a tapping-mode AFM. It is shown that the silvernanoclusters form ordered linear arrays and the intercluster distance within each individual linear array iscomparable to the cluster size. Optical absorption spectra indicate that the surface plasmon resonance (SPR)of the silver nanocluster linear arrays occurs at about 444.5 nm, manifesting a red shift of ~21.4 nm comparedto the SPR absorption of silver nanoclusters deposited on a fused quartz substrate. This is attributed mainlyto the near-field electrodynamic interactions between the silver nanoclusters. This hierarchical approach tocreate ordered nanostructures transcends the spatial limits of lithography and provides a promising route toachieve well-ordered cluster-based nanostructures.