表面增顯拉曼光譜廣泛用於各種領域中，如生物學、醫學、材料、環境檢測等。因此，製備有效的表面增顯拉曼基材，成為近幾年研究所關注的對象。在本研究中，以聚乙烯亞銨(Polyethyleneimine, PEI)作為增加結構韌性利於縮短撈膜時間，於氣液界面成長具介孔結構之二氧化矽薄膜，並運用光催化法於介孔結構中擔載金奈米粒子，創造熱點，並運用於表面增顯拉曼中。利用小角度X光散射與穿透式電子顯微鏡圖像結果指出此二氧化矽薄膜為二維六角晶型結構(2D hexagongal)，金奈米粒子擔載於介孔結構中；傅立葉紅外光譜也證實薄膜中含有聚乙烯亞銨。在表面增顯拉曼測量中，此複合薄膜能有效增顯拉曼訊號分子4-Nitrothiophenol (4-NTP)，最低偵測極限20 nM 。 Surface enhanced Raman scattering(SERS) spectra are widely used in various fileds, such as biomedical, material, analysis, immunology. Therefore, more research is interested to synthesize the more effective SERS materials. In this study we use Polyethyleneimine (PEI) as increasing the structural tenacity and synthesis at the air-water interface. The gold nanoparticles (NPs) can be direct reduced along the pre-embeded polyoxometalates (photocatalytic agents) at the channel, thereby, interconnected metal NPs of uniform particle size in the 2D hexagonally packed SiO2. In addition, we were create hot-spot at the junctions between NPs, to application in SERS spectra. Results of small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) indicate that the mesostructure of as-synthesized silica thin film are 2D-hexagonal. Fourier transform infrared spectroscopy (FTIR) resluts also film containing Polyethyleneimine. In SERS measurement, Au@pPMS can enhance 4-NTP Raman signal effectively. The 4-NTP can be reach the detection limit of 20 nano molar.
