Mali Shivsharan M, Chavan Parag P, Navale Yuvraj H, Patil Vikas B, Sathe Bhaskar R
Department of Chemistry, Dr Babasaheb Ambedkar Marathwada University Aurangabad 431004 Maharashtra India
Functional Materials Research Laboratory, School of Physical Sciences, Solapur University Solapur 413255 Maharashtra India.
RSC Adv. 2018 Mar 21;8(20):11177-11185. doi: 10.1039/c8ra01358f. eCollection 2018 Mar 16.
Herein, we focused on the one pot synthesis of ZnO nanoplates (NP edge thickness of ∼100 nm) using a chemical emulsion approach for chemical (direct) and electrochemical (indirect) determination of NO. The structural and morphological elucidation of the as-synthesized ZnO NPs was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive analysis of X-ray (EDAX), thermogravimetric analysis (TGA) and BET-surface area measurements. The XRD studies of the as-synthesised NPs reveal that ZnO NPs have a Wurtzite type crystal structure with a crystallite size of ∼100 nm. Such ZnO NPs were found to be highly sensitive to NO gas at an operating temperature of 200 °C. Electrocatalytic abilities of these ZnO NPs towards NO/NO were verified through cyclic voltammetry (CV) and linear sweep voltammetry (LSV) using aqueous 1 mM NO (nitrite) in phosphate buffer (pH 7) solution. The results revealed enhanced activity at an onset potential of 0.60 V RCE, achieved at a current density of 0.14 mA cm. These ZnO NPs show selective NO detection in the presence of other reactive species including CO, SO, CHOH and Cl. These obtained results show that this chemical route is a low cost and promising method for ZnO NPs synthesis and recommend further exploration into its applicability towards tunable electrochemical as well as solid state gas sensing of other toxic gases.
在此，我们专注于使用化学乳液法一锅合成ZnO纳米片（NP边缘厚度约为100nm），用于化学（直接）和电化学（间接）测定NO。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线能量色散分析（EDAX）、热重分析（TGA）和BET比表面积测量对合成的ZnO NPs进行结构和形态解析。对合成的NPs进行XRD研究表明，ZnO NPs具有纤锌矿型晶体结构，微晶尺寸约为100nm。发现这种ZnO NPs在200°C的操作温度下对NO气体高度敏感。通过在磷酸盐缓冲液（pH 7）溶液中使用1 mM NO（亚硝酸盐）水溶液进行循环伏安法（CV）和线性扫描伏安法（LSV），验证了这些ZnO NPs对NO/NO的电催化能力。结果表明，在0.60 V RCE的起始电位下活性增强，在电流密度为0.14 mA cm时实现。这些ZnO NPs在包括CO、SO、CHOH和Cl在内的其他活性物种存在下显示出对NO的选择性检测。这些结果表明，这种化学路线是一种低成本且有前景的ZnO NPs合成方法，并建议进一步探索其在可调谐电化学以及其他有毒气体的固态气敏方面的适用性。
