隨著全球科技發展與社會邁向超高齡化，以及對可穿戴式健康監測裝置的需求日益增加。在這些系統中，柔性應力/應變感測器是將機械形變轉化為電訊號的核心元件，扮演關鍵角色。然而傳統剛性感測器難以滿足穿戴需求，為此二維材料MXene因其金屬導電性、優異柔韌性及豐富的表面官能基而備受矚目。
現有MXene感測器製備方法存在挑戰諸如：傳統塗佈技術難以製作出大面積、均勻且厚度可控的奈米級薄膜，而複合材料感測器則主要依賴高分子結構承擔機械形變，MXene本身的作用有限。為克服這些限制，本研究聚焦於界面自組裝技術，該技術在X-Y平面製作MXene薄膜且應用於感測器領域仍屬罕見。
本研究目標是開發藉由界面自組裝技術，在柔性基板上製備具優異均勻性與連續性的奈米級MXene薄膜，並與傳統滴塗法製成的感測器進行性能比較。我們成功合成高純度、高濃度（9 mg/ml）的MXene奈米片，材料分析證實選擇性蝕刻成功移除前驅物中的鋁原子，奈米片純度高、結晶性良好。透過SEM與AFM影像可見，自組裝薄膜由排列有序的奈米片組成，表面平整，厚度達奈米級。
應力/應變感測性能測試結果顯示，自組裝感測器元件的應力/應變響應穩定且可重現，在不同壓力與彎曲應變下均能輸出規律訊號。特別是在數十奈米的厚度下應變感測靈敏度（Gauge Factor）可達1.44。與之相比，滴塗法感測器因薄膜無序排列導致響應不穩定，且在多次測試後發生不可逆的性能退化。另外也透過一系列的測試說明自組裝MXene薄膜可應用於穿戴式裝置，包括人體運動監測與微震動測試，以及字跡辨認裝置上的可行性。
根據研究結果，說明界面自組裝技術在製備高性能、穩定MXene薄膜感測器方面的巨大潛力。這不僅為應變感測器提供了一種新的製備方法，也為開發適用於可穿戴裝置的大面積柔性電子元件提供了另一種可選方式。

MXene, a novel 2D material, has garnered significant interest due to its promising applications in different fields, including flexible pressure sensors, due to its excellent electrical properties and robust mechanical characteristics. This study focuses on the fabrication of an MXene self-assembly film-based flexible wearable multifunctional sensor. Microstructural analysis of the MXene self-assembled film reveals that it consists of single or a few layers of a nanosheet, with a thickness below 1μm even reaching nanometer scale. The self-assembly MXene sensors exhibited stable current responses under varying frequencies, demonstrating their potential for flexible force sensing applications. Additionally, the sensors responded distinctly to inward and outward bending, indicating their capability to detect various human activities successfully.

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