2021
DOI: 10.1021/acs.macromol.1c00012
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Feature Size Modulation in Dewetting of Nanoparticle-Containing Ultrathin Polymer Films

Abstract: Ultrathin polymer films (thinner than ∼100 nm) undergo spontaneous rupture on a non-wetting surface with the appearance of random holes due to interfacial van der Waal’s interaction or disjoining pressure. These holes grow in size and coalesce into threadlike morphology, which subsequently disintegrate in an isotropic array of nearly equal-sized droplets, the size (d D) and periodicity (λD) of which scales with the initial film thickness (h F). We show that both λD and d D of the dewetted droplets can be modul… Show more

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Cited by 13 publications
(12 citation statements)
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“…The evolution of a PMMA25 film is, however, much slower as compared to a PS25 film, as morphological evolution in the PMMA25 film continued till t a ≈ 20 h, in comparison to complete dewetting of the PS25 film within t a ≈ 4 h. Although this study primarily deals with the PS25–PMMA25 bilayer, control experiments reveal that PS film having h F‑PS ≈ 65 nm and h F‑PMMA ≈ 38 nm dewetted fully on the hydrophobized silicon wafer substrates. Beyond these respective h F , only some scattered holes were observed in both types of films …”
Section: Results and Discussionmentioning
confidence: 95%
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“…The evolution of a PMMA25 film is, however, much slower as compared to a PS25 film, as morphological evolution in the PMMA25 film continued till t a ≈ 20 h, in comparison to complete dewetting of the PS25 film within t a ≈ 4 h. Although this study primarily deals with the PS25–PMMA25 bilayer, control experiments reveal that PS film having h F‑PS ≈ 65 nm and h F‑PMMA ≈ 38 nm dewetted fully on the hydrophobized silicon wafer substrates. Beyond these respective h F , only some scattered holes were observed in both types of films …”
Section: Results and Discussionmentioning
confidence: 95%
“…Beyond these respective h F , only some scattered holes were observed in both types of films. 15 In Figure 1, we report dewetting of a PS25−PMMA25 particle-free bilayer. AFM images shown in frames A1−A8 of Figure 1 show the morphological evolution of the bilayer in the form of hole growth till frame A6 (t a ≈ 8.5 h), their coalescence in frame A7 (t a ≈ 19 h), and their disintegration into droplets in frame A8 (t a ≈ 23 h), with progressive TA.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
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“…The dewetting of thin films, which is a separation phenomenon induced by incompatible interfacial energies between the surface and film, is another useful method for micro/nanoscale separation or patterning of various materials, including metals, nanoparticles, and polymers [ 31 , 32 , 33 , 34 , 35 ]. In particular, the dewetting of BCP thin films has been shown to produce micro/nanoscale hierarchical patterns [ 36 , 37 ].…”
Section: Introductionmentioning
confidence: 99%
“…Recent trends of integration and portability generate growing demand for miniaturized devices, which brings great opportunity to this field. However, the uncertainty of the polymer-surface adhesion slows down this evolution. , On the one hand, spontaneous dewetting phenomena of polymers on substrates make it hard to generate polymer microstructures with defined morphologies (e.g., size, thickness, and shape). On the other hand, mismatched polymer–substrate pairs lead to poor adhesion, having a negative impact on device stability. Therefore, it is necessary to get a better control of polymer-surface adhesion.…”
Section: Introductionmentioning
confidence: 99%