柔性壓力感測器在穿戴式電子領域中受到廣泛關注，特別是其實現高靈敏度與偵測微小電訊號變化的能力。本研究成功開發一種基於鎵金屬奈米粒子（GaNPs）與聚二甲基矽氧烷（PDMS）的多層奈米複合材料壓阻式感測器。研究發現，在製備過程中，鎵金屬奈米粒子能相對均勻地嵌入 PDMS 薄膜中，奈米粒子被高分子基材緊密包覆，形成緊密堆積的多層結構，且不增加薄膜總厚度。 此複合材料的壓阻行為主要由量子穿隧效應主導。當粒子間距縮短時，量子穿隧效應顯著增強，使感測器展現出優異的低壓響應特性。在上下電極結構中，稀釋比為 100:1 的樣品在 0–1.5 kPa 的微壓範圍內達到 0.2461 kPa⁻¹ 的高靈敏度，線性度 R² 達 0.9995。此感測器在靜態下近乎絕緣，具備低功耗潛力，其性能指標優於多數既有報導，特別適用於生理訊號監測與柔性觸覺介面等應用;Flexible pressure sensors have received widespread attention in the field of wearable electronics, particularly for their ability to achieve high sensitivity and detect subtle changes in electrical signals. This study successfully developed a multilayer nanocomposite piezoresistive sensor based on gallium nanoparticles (GaNPs) and polydimethylsiloxane (PDMS). Research found that during the preparation process, GaNPs can be relatively uniformly embedded in the PDMS film. The nanoparticles are tightly wrapped by the polymer substrate, forming a densely packed multilayer structure without increasing the total thickness of the film. The piezoresistive behavior of this composite material is primarily dominated by the quantum tunneling effect.When the particle spacing is reduced, the quantum tunneling effect is significantly enhanced, allowing the sensor to exhibit excellent low-pressure response characteristics. In the top-bottom electrode structure, the sample with a dilution ratio of 100:1 achieved a high sensitivity of 0.2461 kPa⁻¹ and a linearity R² of 0.9995 within the low-pressure range of 0–1.5 kPa. This sensor is nearly insulating under static conditions, possessing low power consumption potential. Its performance metrics are superior to most existing reports, making it particularly suitable for applications such as physiological signal monitoring and flexible tactile interfaces.
