Dhara Keerthy, Ramachandran T, Nair Bipin G, Babu T G Satheesh
Department of Sciences, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Amrita University, Coimbatore 641112, India.
Amrita School of Biotechnology, Amrita Vishwa Vidyapeetham, Amrita University, Amritapuri 690525, India.
J Nanosci Nanotechnol. 2018 Jun 1;18(6):4380-4386. doi: 10.1166/jnn.2018.15014.
A highly sensitive nonenzymatic hydrogen peroxide (H2O2) sensor was fabricated using platinum nanoparticles decorated reduced graphene oxide (Pt/rGO) nanocomposite. The Pt/rGO nanocomposite was prepared by single-step chemical reduction method. Nanocomposite was characterized by various analytical techniques including Raman spectroscopy, X-ray diffraction, field emission scanning electron microscope and high-resolution transmission electron microscopy. Screen printed electrodes (SPEs) were fabricated and the nanocomposite was cast on the working area of the SPE. Cyclic voltammetry and amperometry demonstrated that the Pt/rGO/SPE displayed much higher electrocatalytic activity towards the reduction of H2O2 than the other modified electrodes. The sensor exhibited wide linear detection range (from 10 μM to 8 mM), very high sensitivity of 1848 μA mM-1 cm-2 and a lower limit of detection of 0.06 μM. The excellent performance of Pt/rGO/SPE sensor were attributed to the reduced graphene oxide being used as an effective matrix to load a number of Pt nanoparticles and the synergistic amplification effect of the two kinds of nanomaterials. Moreover, the sensor showed remarkable features such as good reproducibility, repeatability, long-term stability, and selectivity.
采用铂纳米颗粒修饰的还原氧化石墨烯（Pt/rGO）纳米复合材料制备了一种高灵敏度的非酶过氧化氢（H2O2）传感器。Pt/rGO纳米复合材料通过单步化学还原法制备。采用拉曼光谱、X射线衍射、场发射扫描电子显微镜和高分辨率透射电子显微镜等多种分析技术对纳米复合材料进行了表征。制备了丝网印刷电极（SPEs），并将纳米复合材料浇铸在SPE的工作区域上。循环伏安法和安培法表明，Pt/rGO/SPE对H2O2还原的电催化活性远高于其他修饰电极。该传感器具有宽线性检测范围（从10 μM到8 mM）、1848 μA mM-1 cm-2的极高灵敏度和0.06 μM的检测下限。Pt/rGO/SPE传感器的优异性能归因于还原氧化石墨烯作为负载大量铂纳米颗粒的有效基质以及两种纳米材料的协同放大效应。此外，该传感器还具有良好的重现性、重复性、长期稳定性和选择性等显著特点。
