Paulraj P, Manikandan A, Manikandan E, Pandian K, Moodley M K, Roro K, Murugan K
Department of Chemistry, Bharath Institute of Higher Education and Research, Bharath University, Chennai 600073, Tamil Nadu, India.
Department of Inorganic Chemistry, University of Madras, Guindy, Chennai 600025, Tamil Nadu, India.
J Nanosci Nanotechnol. 2018 Jun 1;18(6):3991-3999. doi: 10.1166/jnn.2018.15219.
In the present work, Poly(o-phenylenediamine) (POPD) stabilized silver nanoparticles (POPD@AgNPs) nanocomposites was synthesized by solid state oxidative polymerization method using o-phenylenediamine dihydrochloride (oPD-HCl) as monomer and silver nitrate (AgNO3) used as metal precursor as well as oxidizing agent no other external oxidizing agent was used. POPD@AgNPs nanocomposites were characterized by various instrumental techniques to confirm their size, shape and its composition. The electrocatalytic activity of POPD and POPD@AgNPs modified electrode was investigated over the oxidation of hydrazine (N2H4) and reduction of hydrogen peroxide (H2O2) using Cyclic Voltammetry (CV), Differential Pulse Voltammetry (DPV) and Chronoamperometry techniques. POPD and POPD@AgNPs were characterized using HR-TEM, FE-SEM, XRD, UV-Visible, FT-IR, Micro Raman spectroscopy and those results were confirmed their chemical purity, particle size, shape and its elemental compositions. Moreover, the DPV and chronoamperometry reveals that POPD@AgNPs is a good sensor for the electrochemical gas detection of N2H4 and H2O2 because it has good stability, easy-operation, excellent reproducibility, high sensitivity and good limit of detection when compared to with pure POPD. This system shows good stability, excellent sensitivity, response and the detection limit was obtained for the detection of N2H4 and H2O2 in trace level gases, which was lower than some of the modified electrodes.
在本工作中，以盐酸邻苯二胺（oPD-HCl）为单体、硝酸银（AgNO₃）作为金属前驱体及氧化剂，采用固态氧化聚合法合成了聚邻苯二胺（POPD）稳定的银纳米颗粒（POPD@AgNPs）纳米复合材料，未使用其他外部氧化剂。通过各种仪器技术对POPD@AgNPs纳米复合材料进行表征，以确认其尺寸、形状及其组成。采用循环伏安法（CV）、差分脉冲伏安法（DPV）和计时电流法研究了POPD和POPD@AgNPs修饰电极对肼（N₂H₄）氧化和过氧化氢（H₂O₂）还原的电催化活性。使用高分辨透射电子显微镜（HR-TEM）、场发射扫描电子显微镜（FE-SEM）、X射线衍射（XRD）、紫外可见光谱（UV-Visible）、傅里叶变换红外光谱（FT-IR）、显微拉曼光谱对POPD和POPD@AgNPs进行了表征，这些结果证实了它们的化学纯度、粒径、形状及其元素组成。此外，DPV和计时电流法表明，与纯POPD相比，POPD@AgNPs是一种用于N₂H₄和H₂O₂电化学气体检测的良好传感器，因为它具有良好的稳定性、操作简便、重现性优异、灵敏度高和检测限低的特点。该体系显示出良好的稳定性、优异的灵敏度、响应性，对于痕量气体中N₂H₄和H₂O₂的检测获得了检测限，该检测限低于一些修饰电极。
