本研究提出一個簡易且一步化(One-pot)的方法合成鈀奈米粒子/二氧化錫/還原型氧化石墨烯(Pd/SnO2/RGO)奈米複合材料，並於氧化鋁基板上直接製備成室溫型氨氣感測元件。 利用掃描式電子顯微鏡(SEM)、X射線繞射儀(XRD)、原子力顯微鏡(AFM)分析Pd/SnO2/RGO奈米複合材料的結構和型態，並藉由傅立葉紅外線光譜儀(FTIR)、拉曼光譜儀（Raman）證明材料成功製備鈀奈米粒子/二氧化錫/還原型氧化石墨烯複合材料。
由SEM圖顯示，此複合材料中SnO2與RGO相互摻雜，而鈀奈米粒子則附著於表面上。 氨氣測試的結果顯示，在室溫下Pd/SnO2/RGO奈米複合薄膜比純的SnO2薄膜或RGO薄膜具有更好的感測靈敏度，並且對氨氣具有極低的偵測極限(~5 ppm)，除此之外，其感測元件同時擁有良好的選擇性、極佳的重複性、良好的反應時間與回復時間、製作簡單及成本低等優點。並且利用鈀奈米粒子的催化特性以及SnO2與RGO所形成n型半導體毀壞層(depletion layer)的電子結構模型說明Pd/SnO2/RGO 奈米複合材料薄膜在室溫下對氨氣的感測機制。
Novel room-temperature NH3 gas sensors based on Pd, tin oxide (SnO2) and reduced graphene oxide (RGO) ternary nanocomposite (Pd/SnO2/RGO) film were fabricated by the one-pot route. The Pd/SnO2/RGO ternary nanocomposite films were characterized by Fourier transform infrared spectroscopy (FTIR), Raman, X-ray diffractometry (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Microstructural observations revealed that the Pd and SnO2 nanoparticles easily and homogeneously attached to the surface of RGO. The sensor that was based on a Pd/SnO2/RGO ternary nanocomposite film responded strongly to low concentrations of NH3 gas at room-temperature. Its better sensor sensitivity than that of the pristine of SnO2 and SnO2/RGO nanocomposite film was related to the higher conductivity and catalytic activity of the Pd/SnO2/RGO ternary nanocomposite film.
