Skip Main Navigation Links ScienceDirect Logo Skip Main Navigation Links Register or Login: Password: Home Browse Search Forms My Alerts My Profile Help (Opens new window) Quick Search: within Quick Search searches abstracts, titles, and keywords. Click for more information. 1 of 52 Result List No Previous DocumentNext Thin Solid Films Volume 323, Issues 1-2 , 22 June 1998, Pages 1-5 This Document SummaryPlus Full Text + Links PDF (559 K) ------------------------------------------------------------------------ Actions Cited By Save as Citation Alert Export Citation PII: S0040-6090(97)01020-1 Copyright © 1998 Elsevier Science S.A. All rights reserved Letter Analysis of X-ray reflectivity curves of non-Gaussian surfaces G. Vignauda <#orfa>, * <#cor*>, A. Gibauda <#orfa>, F. Parisb <#orfb>, D. Ausserréb <#orfb> and G. Grübelc <#orfc> a Université du Maine, URA 807 CNRS, Faculté des Sciences Le Mans Cedex 72017, France b Université du Maine, URA 509 CNRS, Faculté des Sciences, Le Mans Cedex 72017, France c ESRF, Experimental division, Avenue des Martyrs, BP 220, Grenoble Cedex F 38043, France Received 30 September 1997; accepted 30 October 1997. Available online 28 July 1998. Abstract Surfaces of symmetric diblock copolymers thin films exhibiting non-Gaussian distribution of height are studied by X-ray reflectivity and atomic force microscopy (AFM). When deposited on a silicon substrate, the surface is essentially flat and its roughness may be described by a Gaussian distribution of height. Upon annealing, films operate a two-dimensional phase transformation and form islands at the free surface having height and size that evolve as a function of annealing time. The height probability function cannot be represented by a Gaussian distribution anymore, and the question that arises is how to take into account the morphology of such surfaces in the reflectivity calculations. In a first approach, we show that the height distribution function derived from AFM measurements is directly transferable to analyze X-ray reflectivity curves according to a formalism that we present. In a second part, we determine the height distribution function from a fit to the observed reflectivity. Author Keywords: X-ray reflectometry; Thin film structure and morphology; Polymers; Elastomers and plastics Index Terms: Plastic films; Block copolymers; Atomic force microscopy; Annealing; Probability density function; Phase transitions; Morphology; Elastomers; Thin films; Surface roughness; X ray reflectivity Article Outline 1. Introduction 2. Conclusion References Enlarge Image (72K) Fig. 1. AFM image of relief domains at the free surface of PS/PBMA diblock copolymer films annealed for 6 min (a) and 4 h (b) at 150°C. Enlarge Image (14K) Fig. 2. Height probability function extracted from the AFM measurements on PS/PBMA copolymer films annealed for 6 min (a) and for 4 h (b) at 150°C. Note the appearance of the peak at 600 Å after 4 h of annealing. Enlarge Image (7K) Fig. 3. Calculated (solid line) and observed reflectivities (dotted line) of PS/PBMA copolymer film annealed for 6 min (a) and for 4 h (b) at 150°C. The calculated curves begin at Qz=0.05 Å-1 because of the limitation fixed by the Born approximation. The calculations have been done by entering the height probability extract from the AFM measurements shown in Fig. 2 <#figFig.2>. Enlarge Image (8K) Fig. 4. (a) Height probabilities extracted from the AFM measurement compared to the functional form (solid line) used in the calculation. (b) Calculated (solid line) and observed reflectivities (dotted line) of a PS/PBMA copolymer film annealed for 4 h at 150°C (compare Fig. 4 <#figFig.4>b and Fig. 3 <#figFig.3>b). References 1. L.G. Parrat. Phys. Rev. 95 (1954), p. 359. 2. S.K. Sinha, E.B. Sirota, S. Garoff and H.B. Stanley. Phys. Rev. B 38 (1988), p. 2297. Abstract-INSPEC | $Order Document | Full Text via CrossRef 3. P.Z. Wong and A. Bray. Phys. Rev. B 37 (1989), p. 7751. 4. J. Daillant, K. Quinn, C. Gourier and F. Rieutord. J. Chem. Soc., Faraday Trans. 92 (1996), p. 505. 5. A. Gibaud, N. Cowlam, G. Vignaud and T. Richardson. Phys. Rev. Lett. 74 (1995), p. 3205. Abstract-INSPEC | $Order Document | Full Text via CrossRef 6. R. Pynn. Phys. Rev. B 45 (1992), p. 602. Abstract-INSPEC | $Order Document | Full Text via CrossRef 7. B.B. Mandelbrodt, The Fractal Geometry of Nature, Freeman, NY, 1982. 8. P.P. Swaddling, D.F. McMorrow, R.A. Cowley, R.C.C. Ward and M.R. Wells. Phys. Rev. Lett. 68 (1992), p. 1575. 9. G. 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D 28 (1995), p. A231. Abstract-INSPEC | $Order Document * <#bcor*>Corresponding author. This Document SummaryPlus Full Text + Links PDF (559 K) ------------------------------------------------------------------------ Actions Cited By Save as Citation Alert Export Citation Thin Solid Films Volume 323, Issues 1-2 , 22 June 1998, Pages 1-5 1 of 52 Result List No Previous DocumentNext Home Browse Search Forms My Alerts My Profile Help (Opens new window) ScienceDirect Logo Send feedback to ScienceDirect Software and compilation © 2002 ScienceDirect. All rights reserved. ScienceDirect® is an Elsevier Science B.V. registered trademark. Your use of this service is governed by Terms and Conditions . Please review our Privacy Policy for details on how we protect information that you supply.