Graphene/TiO₂-Ag based composites having various quantities of TiO₂-Ag nanoparticles (5, 10 or 15 wt%) were successfully prepared through a facile chemical-thermal route. The morphological and structural characteristics of the synthesized materials denoted GTA-5, GTA-10 and GTA-15 were investigated by TEM, XRD and FTIR techniques. The composites were used for the modification of three gold electrodes (Au/GTA-5, Au/GTA-10, Au/GTA-15) which were next employed in the electrochemical detection and degradation of amaranth (an azo dye model). The electrode with the best performance in terms of sensitivity was the Au/GTA-10 electrode. It had considerably larger sensitivity (24 mA/M), in comparison with that of Au/GTA-5 and Au/GTA-15 electrode (8 mA/M and 12 mA/M, respectively). The limit of detection was the same for all modified electrodes (LOD = 1 × 10⁻⁷ M; S/N = 3). The Au/GTA-10 electrode was also tested at the electrochemical degradation of amaranth, from aqueous solutions. The degradation reaction followed a first order kinetics with a half-time of degradation of 203 minutes. The response characteristics of the proposed sensor made it a good candidate for integration in the Ubiquitous sensor's network for IOT.

中文翻译：

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石墨烯/ TiO2-Ag基复合材料用作A菜电化学检测和降解的敏感电极材料

具有各种TiO ₂量的石墨烯/ TiO ₂ -Ag基复合材料通过简便的化学-热途径成功制备了-Ag纳米粒子（5、10或15 wt％）。用TEM，XRD和FTIR技术研究了合成材料GTA-5，GTA-10和GTA-15的形貌和结构特征。该复合材料用于修饰三个金电极（Au / GTA-5，Au / GTA-10，Au / GTA-15），然后用于电化学检测和降解a菜（偶氮染料模型）。就灵敏度而言，性能最佳的电极是Au / GTA-10电极。与Au / GTA-5和Au / GTA-15电极（分别为8 mA / M和12 mA / M）相比，它具有更大的灵敏度（24 mA / M）。所有修饰电极的检出限均相同（LOD = 1×10 ^-7M; S / N = 3）。还测试了Au / GTA-10电极从水溶液中from菜的电化学降解。降解反应遵循一级动力学，半衰期为203分钟。所提出的传感器的响应特性使其成为在物联网的无所不在的传感器网络中集成的良好候选者。