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Title: In situ imaging and height reconstruction of phase separation processes in polymer blends during spin coating
Authors: Ebbens, Stephen
Hodgkinson, Richard
Parnell, Andrew J.
Dunbar, Alan
Martin, Simon J.
Keywords: Polymer blends
Spin coating
Microscope
Photovoltaic cells
Issue Date: 2011
Publisher: ACS Publications (© American Chemical Society)
Citation: EBBENS, S. ... et al, 2011. In situ imaging and height reconstruction of phase separation processes in polymer blends during spin coating. ACS Nano, 5 (6), pp. 5124–5131.
Abstract: Spin coating polymer blend thin films provides a method to produce multiphase functional layers of high uniformity covering large surface areas. Applications for such layers include photovoltaics and light-emitting diodes where performance relies upon the nanoscale phase separation morphology of the spun !lm. Furthermore, at micrometer scales, phase separation provides a route to produce self-organized structures for templating applications. Understanding the factors that determine the final phase-separated morphology in these systems is consequently an important goal. However, it has to date proved problematic to fully test theoretical models for phase separation during spin coating, due to the high spin speeds, which has limited the spatial resolution of experimental data obtained during the coating process. Without this fundamental understanding, production of optimized micro- and nanoscale structures is hampered. Here, we have employed synchronized stroboscopic illumination together with the high light gathering sensitivity of an electron-multiplying charge-coupled device camera to optically observe structure evolution in such blends during spin coating. Furthermore the use of monochromatic illumination has allowed interference reconstruction of three-dimensional topographies of the spin-coated film as it dries and phase separates with nanometer precision. We have used this new method to directly observe the phase separation process during spinning for a polymer blend (PS-PI) for the first time, providing new insights into the spin-coating process and opening up a route to understand and control phase separation structures.
Description: This item is Closed Access. To access the final edited and published work see http://dx.doi.org/10.1021/nn201210e
Version: Closed access
DOI: 10.1021/nn201210e
URI: https://dspace.lboro.ac.uk/2134/8515
Publisher Link: http://dx.doi.org/10.1021/nn201210e
ISSN: 1936-0851
Appears in Collections:Closed Access (Materials)

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