Large-Scale Simultaneous Orientation of CdSe Nanorods and Regioregular Poly(3-hexylthiophene) by Mechanical Rubbing

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• 作者：Lucia Hartmann ; David Djurado ; Ileana Florea ; Jean-Fran莽ois Legrand ; Angela Fiore ; Peter Reiss ; Stephen Doyle ; Alexe茂 Vorobiev ; St茅phanie Pouget ; Fr茅d茅ric Chandezon ; Ovidiu Ersen ; Martin Brinkmann
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：August 13, 2013
• 年：2013
• 卷：46
• 期：15
• 页码：6177-6186
• 全文大小：585K
• 年卷期：v.46,no.15(August 13, 2013)
• ISSN：1520-5835

文摘

Highly oriented hybrid thin films composed of rod-shaped CdSe nanocrystals and poly(3-hexylthiophene) are prepared by mechanical rubbing. The orientation distribution of both CdSe nanorods and crystalline P3HT domains is determined by a combination of transmission electron microscopy (electron diffraction, low dose high-resolution TEM, and tomography), grazing incidence X-ray diffraction measurements, and UV鈥搗is spectroscopy. After rubbing, P3HT crystalline domains show a preferential face-on orientation ((010) contact plane) and the chains align parallel to the rubbing direction. CdSe nanorods also align parallel to the rubbing direction, but the level of alignment is a function of their concentration in the polymer matrix: the lower their concentration, the higher the level of in-plane orientation of both the nanorods and the polymer chains. GIXD and electron diffraction suggest that CdSe nanorods adopt a preferential contact plane on the substrate after rubbing. The high in-plane alignment of the nanorods is mainly due to the orientation of the surrounding P3HT matrix. In particular, low dose HR-TEM shows that the local orientation of individual NRs matches the orientation of the surrounding 蟺-stacked P3HT chains. For a high NR concentration, bundling of NRs into larger aggregates prevents their efficient alignment by rubbing.