Cheng Zhenyu, Song Haiyan, Zhang Xianfa, Cheng Xiaoli, Xu Yingming, Zhao Hui, Gao Shan, Huo Lihua
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China; College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China.
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China; College of Chemistry & Chemical Engineering, Longdong University, Qingyang 745000, China.
Colloids Surf B Biointerfaces. 2022 Mar;211:112313. doi: 10.1016/j.colsurfb.2021.112313. Epub 2021 Dec 30.
A unique near-spherical ZnO nanostructure was synthesized by using mixed solvents composed of polyethylene glycol-400 (PEG-400) and water at the volume ratio of 12:1 via the solvo-thermal method, and it possessed an ideal morphology with higher uniformity, better dispersion and small particle size. Such ZnO was employed to modify glass carbon electrode (GCE) for the construction of electrochemical sensor, i.e. near-spherical ZnO/GCE, whose nitrite sensing performance was evaluated by Chronoamperometry (CA) and Linear Sweep Voltammetry (LSV). In order to emphasis the superior sensing property and extensive suitability for different electrochemical detection techniques, the excellent but not the same nitrite detection performance obtained from CA and LSV was individually given in detail. This sensor based on CA showed broad linearity range of 0.6 μM-0.22 mM and 0.46 mM-5.5 mM, improved sensitivity of 0.785 μA μM cm accompanied with low LOD of 0.39 μM. With regard to LSV, wide linearity response of 1.9 μM-0.8 mM and 1.08 mM-5.9 mM, high sensitivity of 0.646 μA μM cm with LOD of 0.89 μM were obtained. Meanwhile, this sensor displayed outstanding repeatability with RSD of 2.96% (n = 4), high reproducibility with low RSD (1.72%-2.35%, n = 4), strong selectivity towards nitrite with the concentration set at one-tenth of the interfering substances, ideal stability with the peak current intensity above 90% of its initial value after storage for one month and acceptable recovery of 1.72-2.35% to actual samples including ham sausage, pickle and tap water. The near-spherical ZnO nanomaterial may be a preferred candidate for the fabrication of nitrite electrochemical sensor, which may exhibit a fascinating application in terms of food analysis and environmental monitoring.
通过溶剂热法，以体积比为12:1的聚乙二醇 - 400（PEG - 400）和水组成的混合溶剂合成了一种独特的近球形ZnO纳米结构，其具有更高的均匀性、更好的分散性和更小的粒径，形态理想。将这种ZnO用于修饰玻碳电极（GCE）以构建电化学传感器，即近球形ZnO/GCE，并通过计时电流法（CA）和线性扫描伏安法（LSV）评估其对亚硝酸盐的传感性能。为了强调其优异的传感性能以及对不同电化学检测技术的广泛适用性，详细分别给出了由CA和LSV获得的出色但不同的亚硝酸盐检测性能。基于CA的该传感器显示出0.6 μM - 0.22 mM和0.46 mM - 5.5 mM的宽线性范围，灵敏度提高至0.785 μA μM⁻¹ cm⁻²，检测限低至0.39 μM。对于LSV，获得了1.9 μM - 0.8 mM和1.08 mM - 5.9 mM的宽线性响应，灵敏度为0.646 μA μM⁻¹ cm⁻²，检测限为0.89 μM。同时，该传感器具有出色的重复性，相对标准偏差（RSD）为2.96%（n = 4），高重现性，低RSD（1.72% - 2.35%，n = 4），对亚硝酸盐具有强选择性，干扰物质浓度设定为亚硝酸盐浓度的十分之一，具有理想的稳定性，储存一个月后峰电流强度高于其初始值的90%，对包括火腿肠、泡菜和自来水在内的实际样品的回收率为1.72 - 2.35%。近球形ZnO纳米材料可能是制造亚硝酸盐电化学传感器的首选候选材料，在食品分析和环境监测方面可能具有迷人的应用前景。
