ZnO nanostructures growth by hydrothermal process for nitrate ion sensing application

2021 IEEE International Conference on Sensors and Nanotechnology (SENNANO) Pub Date : 2021-09-22 DOI:10.1109/sennano51750.2021.9642598

W. H. Khoo, Muhammad Luqman Mohd Napi, M. L. Peng Tan, Shaharin Fadzli Bin Abd Rahman, S. M. Sultan

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Abstract

ZnO nanostructures were grown on glass substrate using a hydrothermal process with zinc nitrate hexahydrate and hexamethylenetetramine ratio of 1:1. In this work, the growth of ZnO nanostructures is executed at oven temperature of 95°C for 5 hours. The XRD results demonstrate the presence of ZnO on the growth sample with the highest peak corresponding to planes at (100), (101), and (002) appeared at ~31.7°, ~34.4° and ~36.2° respectively. The VPSEM image shows random arrangement of nanostructures. The sample has a resistivity of ~1.23 MΩ with nitrate ion sensitivity range of 39.29 to 57.75. This sample was used to test with 1M of nitrate solution to study the sensing properties. Repetitive measurements at 1.5V after exposed with nitrate solution shows a minimum current drift of 4.27% for the first two measurement and maximum drift at fifth measurement of 36.75%. This indicates a reliable result can be obtained in the first two measurements with nitrate solution.

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水热法制备ZnO纳米结构用于硝酸离子传感

以六水硝酸锌与六亚甲基四胺的比例为1:1，采用水热法在玻璃基板上生长ZnO纳米结构。在这项工作中，ZnO纳米结构在95℃的烘箱温度下生长5小时。XRD结果表明，生长样品上存在ZnO，在~31.7°、~34.4°和~36.2°处分别出现(100)、(101)和(002)面对应的峰值。VPSEM图像显示纳米结构的随机排列。样品的电阻率为~1.23 MΩ，硝酸盐离子灵敏度范围为39.29 ~ 57.75。该样品用1M的硝酸溶液进行测试，研究其传感性能。暴露于硝酸溶液后，在1.5V下重复测量显示，前两次测量的最小电流漂移为4.27%，第五次测量时的最大漂移为36.75%。这表明用硝酸溶液进行前两次测量可以得到可靠的结果。

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2021 IEEE International Conference on Sensors and Nanotechnology (SENNANO)

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