Abstract
We have examined the structural evolution of a thin gold layer sandwiched between two polymer films using specular X-ray reflectivity. We used a depth-profiling model consisting of three independent layers, upper and bottom PS layers and an intermediate gold layer. The results show that a well-defined as-deposited Au layer of about 62 ± 3 Å breaks within 10 min of annealing at 120 °C. During the breakage of the Au film, the bottom low-Mw PS flows to fill into the void between the Au particles, causing the reduction of the bottom PS film, while the top polymer layer remains relatively constant.
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Reasonable fits over the entireq-range were not possible without the inclusion of this low-density layer of 15 Å thick at the P 2/Au interface, implying that there is an air gap after the floating process. This low-density layer disappeared after the annealing process.
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Shin, K., Wang, H., Satija, S.K. et al. X-ray Reflectivity Study of Gold Nanoparticles in a Polymer Matrix. MRS Online Proceedings Library 710, 1471 (2001). https://doi.org/10.1557/PROC-710-DD14.7.1
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DOI: https://doi.org/10.1557/PROC-710-DD14.7.1