此篇高分子薄膜研究，其源於對液體於自由表面濕潤現象以及介面作用力的興趣。此外，對於高分子薄膜表面不穩定性的理解在技術應用的廣泛領域中不斷取得進展。對於特定的應用來說，表面不穩定是一件須要避免的事情，因此，薄膜穩定性是非常重要的。然而，能夠檢測和調控薄膜表面的不穩定性也可以在光電子學、生物科技、奈米微影製程和新型感測器和驅動器等應用中帶來優勢。許多研究專注於高分子薄膜受外力所誘發表面不穩定性之複雜性。在此篇研究中，我們利用聚(4-乙烯基吡啶)(P4VP)以及聚(2-乙烯基吡啶)(P2VP)來研究薄膜的不穩定性。我們利用含浸法來測試聚(4-乙烯基吡啶) (P4VP)和聚(2-乙烯基吡啶) (P4VP)的表面不穩定性，利用旋轉塗佈法將薄膜固定於基材上，然後浸入包含四氯金酸(HAuCl4)及碳酸鉀(K2CO3)混合物的種子溶液中。聚合物與溶劑之間作用力以及界面力所導致的協同效應使得聚(4-乙烯基吡啶)P4VP和聚(2-乙烯基吡啶)P2VP薄膜表面分別形成皺紋和坑洞。表面皺紋和坑洞的多寡受到多種因素的強烈影響，包括薄膜厚度、四氯金酸(HAuCl4)的量以及金離子的類型。除此之外，我們還對旋轉塗佈過程中聚(4-乙烯基吡啶)P4VP薄膜表面不穩定性進行了研究。觀察到在巨觀尺度、微觀尺度和介觀尺度上的多層級結構。這些結果為了解聚(4-乙烯基吡啶)P4VP和聚(2-乙烯基吡啶)P2VP薄膜表面不穩定性的動態提供了寶貴的見解。;The study of thin polymer films is driven by a fundamental interest in wetting phenomena and interfacial interactions of liquids at free surfaces. Furthermore, the vast field of technological applications sparks continuous advancements in the understanding of surface instability in polymer thin films. Surface instability might be undesirable for some applications where the stability of thin films is important. However, the ability to detect and manipulate surface instabilities in thin films can also be advantageous for applications such as optoelectronics, biotechnology, nanolithography, and novel sensors and actuators. Numerous studies have focused on the complexity of surface instability in polymer thin films induced by external forces. In this study, we investigate the specific case of thin film instability in poly(4-vinyl pyridine) (P4VP) and poly(2-vinyl pyridine) (P2VP) thin films. The surface instability in P4VP and P2VP is based on the immersion approach in which the films are spin-coated onto a solid substrate and subsequently immersed in a seed solution containing HAuCl4 and its mixtures with K2CO3. The synergistic effect between polymer-solvent interactions and interfacial forces leads to the formation of wrinkles and craters on the surface of P4VP and P2VP thin films, respectively. The degree of surface wrinkling and cratering is strongly governed by various factors such as film thickness, amount of HAuCl4, and type of gold ions. Furthermore, the surface instability on the as-spun P4VP films during spin-coating is also investigated. Hierarchical patterns at macro-scale, micro-scale, and mesoscale are observed. The results provide valuable insights into the dynamics of surface instability in P4VP and P2VP thin films.
