在先前的實驗中，實驗室已在適當的製程條件下利用真空熱蒸鍍機（Thermal coater）將鎵金屬奈米粒子蒸鍍於經過固化處理的聚二甲基矽氧烷（Polydimethylsiloxane, PDMS）塊材的近表面之下。而在本次實驗中進一步將未固化的PDMS與己烷（Hexane）按特定比例混合，達到稀釋PDMS的目的。此混合物隨後被均勻塗佈於矽基板上，經過加熱處理後固化，形成奈微級厚度的PDMS薄膜，同樣利用熱蒸鍍的方式將鎵奈米粒子沉積於薄膜當中，通過重複這一系列步驟，並根據PDMS塗佈的不同薄膜厚度，成功製備了具有多層結構的超薄鎵奈米粒子/聚合物複合材料。本研究透過掃描式（SEM）對複合材料的多層結構進行觀察，分析其表面和截面的形貌特徵。接著使用精密數字電橋（LCR-meter）量測介電常數，另外用自製材料按壓試驗載具，對超薄複合材料施加微小應力，從而觀察和分析材料在外部應力作用下的電容變化（∆C/C0）。 實驗結果顯示，將Hexane與未固化的PDMS按70:1的比例混合後，可製備出厚度僅為96奈米的PDMS薄層，並以此條件製備的鎵奈米粒子/PDMS複合材料為3層結構的情況中，在1 kHz頻率下其介電常數表現為12.06；而當鎵奈米粒子的層數增至12層時，介電常數進一步提升至15.09，相比純PDMS的介電常數高出4.5倍。進一步進行的壓力測試發現，使用70:1和10:1的Hexane/PDMS比例製備的12層結構鎵奈米粒子/PDMS複合材料，在大約2.4 kPa的壓力下，電容變化率分別為0.079和0.013。這顯示在鎵粒子層之層間距較窄（即層間PDMS較薄）的情況下，複合材料不僅展示出更高的介電常數，同時在相對壓力下也顯示出更高的電容變化率。 ;In our previous experiments, we used a thermal coater under optimal conditions to deposit gallium nanoparticles beneath the surface of cured polydimethylsiloxane (PDMS). We advanced this process by mixing uncured PDMS with hexane in a specified ratio, thinning the PDMS for uniform coating on a silicon substrate. After heating and curing, this created nanometer-thick PDMS films, into which gallium nanoparticles were deposited through thermal evaporation. Repeating these steps with varied film thicknesses enabled the successful fabrication of ultra-thin, multilayer gallium nanoparticle/polymer composites. These composites were analyzed using Scanning Electron Microscopy (SEM) and to study their multilayer structures and morphological characteristics. We measured the dielectric constant with a precision LCR meter and applied minimal stress using a custom press test apparatus to observe and analyze capacitance changes (∆C/C0) under stress. Experimental results indicate that by mixing Hexane with uncured PDMS at a ratio of 70:1, we achieved the thinnest PDMS layer of 96 nanometers. Using this preparation, a three-layer gallium nanoparticle/PDMS composite exhibited a dielectric constant of 12.06 at 1 kHz. Increasing the layers to twelve enhanced the constant to 15.09, 4.5 times that of pure PDMS. Further pressure tests on these 12-layer composites, prepared with 70:1 and 10:1 Hexane/PDMS ratios, showed capacitance change rates of 0.079 and 0.013 under approximately 2.4 kPa. These findings demonstrate that with narrower interlayer spacing (thinner PDMS layers), the composites not only show higher dielectric constants but also greater capacitance change rates under pressure.
