本實驗開發一種新穎的電化學感測元件，使用金奈米粒子(AuNPs)、β-環糊精(β-cyclodextrin)和還原的氧化石墨烯(RGO)複合在金電極上所製備的奈米複合材料，用於同時檢測鄰苯二酚(hydroquinone，HQ)和對苯二酚(catechol，CC)。
利用傅里葉轉換紅外光譜(FTIR)和電化學阻抗譜(EIS)檢視奈米金/β-環糊精/還原氧化石墨烯複合金電極感測元件的特性。另外以差分脈衝伏安法(DPV)同時探討奈米金/β-環糊精/還原氧化石墨烯複合金電極對於鄰苯二酚與對苯二酚之電化學行為。以最佳化製備條件下，將還原氧化石墨烯複合金電極官能化上β-環糊精以及金奈米粒子，在區別HQ與CC感度上有明顯提升。
本實驗以奈米金/β-環糊精/還原氧化石墨烯複合金電極對於鄰苯二酚與對苯二酚二元混合物有高反應、工作範圍廣、線性好、偵測極限低、良好的重複性以及回收率。
A gold electrode that was modified using a nanocomposite of Au nanoparticles (AuNPs), ß-cyclodextrin (ß-CD) and a reduced graphene oxide (RGO) (AuNPs/ß-CD/RGO/Au electrode) was fabricated for use in an electrochemical sensor for the simultaneous detection of hydroquinone (HQ) and catechol (CC). The AuNPs/ß-CD/RGO nanocomposite was characterized by Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). The electrochemical behaviors of HQ and CC toward the AuNPs/ß-CD/RGO electrode were investigated using differential pulse voltammetry (DPV). Factors that affected the response of the AuNPs/ß-CD/RGO/Au electrode were optimized. The discrimination and sensitivity of the AuNPs/ß-CD/RGO/Au electrode were improved above those of the RGO/Au electrode by modifying it with ß-CD and AuNPs. The electrochemical sensor that was based on the AuNPs/ß-CD/RGO/Au electrode for the simultaneous detection of HQ and CC in a binary mixture had a strong response, wide working range, good linearity, low detection limit, excellent reproducibility of fabrication and excellent operational repeatability.
