製備反蛋白石孔洞結構之鉑金屬以及其在催化甲醇氧化和表面增強拉曼光譜之應用

Abstract

在本研究中，我們利用自組裝成規則陣列的聚苯乙烯奈米球作為模板，以化學電鍍的方法，使鉑金屬還原在基材上聚苯乙烯奈米球的縫隙之間，最後去除模板即可製備出反蛋白石孔洞結構的鉑金屬，藉由改變不同的電鍍時間，可以得到不同厚度的鉑金屬。我們用SEM、TEM和XRD對這些鉑金屬進行特性分析。 我們將得到的鉑金屬做電化學的分析，利用循環伏安法來計算其電化學活性表面積，以及在探討其在甲醇氧化的催化能力。實驗結果得知，此種孔洞結構具有高電化學活性表面積，並有良好的催化能力。另外，我們將之應用於表面增強拉曼光譜上，所偵測的分子為苯硫酚和rhodamine 6G，激發光源為532 nm，從實驗結果得知，此種反蛋白石孔洞結構的鉑金屬是具有增強拉曼訊號的效果，而可偵測到rhodamine 6G的偵測極限為10-7 M。

In this research, inverse opal macroporous platinum films with enhanced surface areas were obtained by using polystyrene sphere templates to assist the growth of ordered three dimensional structures following by the template removal. The platinum films were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), cyclic voltammetry (CV) and high resolution confocal Raman microscope. In electrocatalytic analysis, the results confirmed that the platinum film possessed a macroporous structure with high surface areas and exhibited excellent electrochemical properties. The electrocatalytic application of the resulting inverse opal macroporous platinum electrodes for methanol oxidation was investigated. They showed high catalytic activity and stable electrocatalytic performance for methanol oxidation. In surface-enhanced Raman spectroscopy (SERS) ananlysis, we investigated the enhancement of Raman signals of benzenethiol and rhodamine 6G on the inverse opal macroporous platinum films with 532 nm excitation. The results showed that the platinum films possessed SERS effect and the detection limit of rhodamine 6G was down to 10-7 M.