Patterning of Magnetic Bimetallic Coordination Nanoparticles of Prussian Blue Derivatives by the Langmuir鈥揃lodgett Technique

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• 作者：Miguel Clemente-Le贸n ; Eugenio Coronado ; 脕ngel L贸pez-Mu帽oz ; Diego Repetto ; Laure Catala ; Talal Mallah
• 刊名：Langmuir
• 出版年：2012
• 出版时间：March 6, 2012
• 年：2012
• 卷：28
• 期：9
• 页码：4525-4533
• 全文大小：505K
• 年卷期：v.28,no.9(March 6, 2012)
• ISSN：1520-5827

文摘

We report a novel method to prepare patterns of nanoparticles over large areas of the substrate. This method is based on the adsorption of the negatively charged nanoparticles dispersed in an aqueous subphase onto a monolayer of the phospholipid dipalmitoyl-l-伪-phosphatidylcholine (DPPC) at the air鈥搘ater interface. It has been used to prepare patterns of nanoparticles of Prussian blue analogues (PBA) of different size (K_0.25Ni[Fe(CN)₆]_0.75 (NiFe), K_0.25Ni[Cr(CN)₆]_0.75 (NiCr), K_0.25Ni[Co(CN)₆]_0.75 (NiCo), Cs_0.4Co[Cr(CN)₆]_0.8 (CsCoCr), and Cs_0.4Co[Fe(CN)₆]_0.9 (CsCoFe)). The behavior of DPPC monolayer at the air鈥搘ater interface in the presence of the subphase of PBA nanoparticles has been studied by the compression isotherms and Brewster angle microscopy (BAM) images. Atomic force microscopy (AFM) of the transferred films on mica substrates shows that patterns of the nanoparticles are observed for a 10^鈥? M concentration of the subphase, based on the nanoparticle precursors, at surface pressures between 1 and 6 mN/m and transfer velocities from 10 to 80 mm/min. Vertical, horizontal, or tilted fringes of the nanoparticles with respect to the transfer direction can be obtained depending on the transfer velocity and surface pressure.