How Gregory Thien Soon, Pandikumar Alagarsamy, Ming Huang Nay, Ngee Lim Hong
Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
1] Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia [2] Functional Device Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
Sci Rep. 2014 May 23;4:5044. doi: 10.1038/srep05044.
Titanium dioxide (TiO2) with highly exposed {001} facets was synthesized through a facile solvo-thermal method and its surface was decorated by using reduced graphene oxide (rGO) sheets. The morphology and chemical composition of the prepared rGO/TiO2 {001} nanocomposite were examined by using suitable characterization techniques. The rGO/TiO2 {001} nanocomposite was used to modify glassy carbon electrode (GCE), which showed higher electrocatalytic activity towards the oxidation of dopamine (DA) and ascorbic acid (AA), when compared to unmodified GCE. The differential pulse voltammetric studies revealed good sensitivity and selectivity nature of the rGO/TiO2 {001} nanocomposite modified GCE for the detection of DA in the presence of AA. The modified GCE exhibited a low electrochemical detection limit of 6 μM over the linear range of 2-60 μM. Overall, this work provides a simple platform for the development of GCE modified with rGO/TiO2 {001} nanocomposite with highly exposed {001} facets for potential electrochemical sensing applications.
通过简便的溶剂热法合成了具有高度暴露{001}晶面的二氧化钛（TiO₂），并使用还原氧化石墨烯（rGO）片对其表面进行修饰。通过合适的表征技术对制备的rGO/TiO₂{001}纳米复合材料的形貌和化学成分进行了研究。rGO/TiO₂{001}纳米复合材料用于修饰玻碳电极（GCE），与未修饰的GCE相比，其对多巴胺（DA）和抗坏血酸（AA）的氧化表现出更高的电催化活性。差分脉冲伏安法研究表明，rGO/TiO₂{001}纳米复合材料修饰的GCE在AA存在下检测DA时具有良好的灵敏度和选择性。修饰后的GCE在2 - 60 μM的线性范围内表现出6 μM的低电化学检测限。总体而言，这项工作为开发用于潜在电化学传感应用的、用具有高度暴露{001}晶面的rGO/TiO₂{001}纳米复合材料修饰的GCE提供了一个简单的平台。
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