中孔洞複合材料應用於電化學與拉曼感測器

Abstract

本研究以類史托伯方法 (Stöber method) 藉由沸石晶種與界面活性劑在40度下自組裝形成中孔洞沸石奈米粒子 (MZNs)。這種以沸石為組成的奈米粒子具有高結晶性所產生之微孔性質，同時具備耐高溫及水氣之性質。MZNs具有高比表面積 (SBET > 800 m2/g） 與大孔徑 (~5 nm）能同時作為硬模板，用於限制銀奈米粒子之生長能有效作為表面拉曼增強 (SERS) 的基材，將所合成的中孔洞奈米銀複合材料 (Ag@MZNs) 負載到晶片上製成簡易型SERS感測晶片，能夠有效進行10-1 M可多普洛菲 (Ketoprofen) 等濫用藥物之檢測。 本研究另一個材料為合成中孔洞氧化石墨烯奈米粒子 (MGNs)，此材料負載於高比表面積 (SBET > 800 m2/g) 之MZNs上，經由高溫乙烯處理石墨烯化，表面沉積類氧化石墨烯 (GO) 使其具有半導體特性，可浸塗於網印碳電極 (SPCE) 上進行電化學感測10 mM易氧化之人體精神分子，成為多巴胺電化學檢測時的理想選擇，透過修飾MGNs增強電極的靈敏度，讓MGNs@SPCE能有效應用於檢測微量多巴胺。Mesoporous zeolite nanoparticles (MZNs) were synthesized in a Stöber-like (CTAB–EtOH–TEOS-ammonia) conditions via self-assembly of β-zeolite seeds and surfactants at 40–50 °C. These zeolite-based materials which are microcrystalline as well as moisture- and thermal-robust. Their high surface area (SBET > 800 m2/g) and large pore size (~5 nm) may serve as excellent hard templates for confining silver nanoparticles with defined sizes. Various applications, including SERS for biomarker sensing. Integration of the resulting Ag@MZN into chips creates facile SERS sensors that demonstrates detection capability for abuse drugs, such as Ketoprofen about 10-1 M. Alternatively, mesoporous graphene-oxide nanoparticle (MGNs) are supported on MZNs with high surface area (SBET > 800 m2/g). Graphitized by high-temperature ethylene treatment, the graphene oxide (GO)-like deposited on the surface make MGNs are semiconducting nanomaterials, dip coating onto screen printed carbon electrode (SPCE) for electrochemical sensing of 10mM of easily oxidized human mental molecules, it is an idea for the electrochemical detection of dopamine. By modifying the MGNs to enhance the sensitivity of the electrode, MGNs@SPCE can be effectively used to detect trace amounts of dopamine.