Synthesis of Au Nanoparticles Supported on Functionalized Silica Gel for Amperometric Determination of Hydrogen Peroxide in Contact Lens Solution
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2019
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Bu çalışmada, kontakt lens çözeltisinde H2O2'nin elektrokimyasal olarak tayin edilebilmesi için (3-Aminopropil)trietoksisilan (APTES) ile fonksiyonel hale getirilmiş SiO2 destekli Au nanoparçacıklarına (Au@SiO2-APTES) dayalı yeni bir nanokompozit elde edilmiştir. Nafyon (Nf) koruyucu membran olarak kullanılmıştır. Au@SiO2-APTES ve SiO2-APTES kompozitleri ile modifiye edilmiş camsı karbon elektrodun (GCE) elektrokimyasal özellikleri, Elektrokimyasal impedans spektrokopisi (EIS), Dönüşümlü voltametri (CV) ve amperometri kullanılarak değerlendirilmiştir. Nanokompozitlerin karakterizasyonu için X-ışını difraksiyonu (XRD), Geçirimli elektron mikroskobu (TEM) ve Fourier transform infrared spektroskopisi (FTIR) kullanılmıştır. Elde edilen Nf/Au@SiO2-APTES/GCE sensörü H2O2 için iki doğrusal tayin aralığı göstermiştir. Birinci tayin aralığı 14-180 µM ve ikinci tayin aralığı 0.18-7.15 mM olarak belirlendi. Sensörün gözlenebilme sınırı (LOD) ve duyarlılıkları sırasıyla 4.75 µM, 2514.6 µA mM-1 cm-2 ve 894.2 µA mM-1 cm-2 olarak hesaplanmıştır. Sensör H2O2 için mükemmel seçicilik göstermiş ayrıca Nf/Au@SiO2-APTES/GCE kullanılarak kontakt lens çözeltisinde H2O2 başarılı bir şekilde tayin edilmiştir.
In this study, a new nanocomposite based on (3-aminopropyl)triethoxysilane (APTES) functionalized SiO2 supported Au nanoparticles (Au@SiO2-APTES) was achieved for electroanalytical determintion of H2O2 in contact lens solution. Nafion (Nf) was performed as a protective membrane. The electrochemical properties of GCE modified with Au@SiO2-APTES and SiO2-APTES were evaluated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and amperometry. X-ray diffraction (XRD), transmission electron microscopy (TEM), and fourier transform infrared spectroscopy (FTIR) were used for characterization of the nanocomposites. The obtained Nf/Au@SiO2-APTES/GCE sensor exhibited two linear determination ranges for H2O2. The first one was 14-180 µM and the second one was 0.18-7.15 mM. The limit of detection (LOD) and sensitivities of the sensor were calculated to be 4.25 µM, 2514.6 µA mM-1 cm-2 and 894.2 µA mM-1 cm-2, respectively. The sensor showed excellent selectivity for H2O2. Also, H2O2 was successfully detected in contact lens solution using Nf/Au@SiO2-APTES/GCE.
In this study, a new nanocomposite based on (3-aminopropyl)triethoxysilane (APTES) functionalized SiO2 supported Au nanoparticles (Au@SiO2-APTES) was achieved for electroanalytical determintion of H2O2 in contact lens solution. Nafion (Nf) was performed as a protective membrane. The electrochemical properties of GCE modified with Au@SiO2-APTES and SiO2-APTES were evaluated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and amperometry. X-ray diffraction (XRD), transmission electron microscopy (TEM), and fourier transform infrared spectroscopy (FTIR) were used for characterization of the nanocomposites. The obtained Nf/Au@SiO2-APTES/GCE sensor exhibited two linear determination ranges for H2O2. The first one was 14-180 µM and the second one was 0.18-7.15 mM. The limit of detection (LOD) and sensitivities of the sensor were calculated to be 4.25 µM, 2514.6 µA mM-1 cm-2 and 894.2 µA mM-1 cm-2, respectively. The sensor showed excellent selectivity for H2O2. Also, H2O2 was successfully detected in contact lens solution using Nf/Au@SiO2-APTES/GCE.
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Kimya, Chemistry
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