Purpose

Various approaches have been made to alter the vibration sensing properties of zinc oxide (ZnO) films to achieve high sensitivity. This paper aims to report the experimental study of the fabrication of precursor molar ratio concentration varied ZnO nanostructures grown on rigid substrates using the refresh hydrothermal method. The effect of these fabricated ZnO nanostructures-based vibration sensors was experimentally investigated using a vibration sensing setup.

Design/methodology/approach

ZnO nanostructures have been grown using low temperature assisted refresh hydrothermal method with different precursor molar concentrations 0.025 M (R1), 0.075 M (R2) and 0.125 M (R3). Poly 3,4-ethylenedioxythiophene polystyrene sulfonate, a p-type material is spun coated on the grown ZnO nanostructures. Structural analysis reveals the increased intensity of the (002) plane and better c-axis orientation of the R2 and R3 sample comparatively. Morphological examination shows the changes in the grown nanostructures upon increasing the precursor molar concentration. The optical band gap value decreases from 3.11 eV to 3.08 eV as the precursor molar concentration is increased. Photoconductivity study confirms the formation of a p-n junction with less turn-on voltage for all the fabricated devices. A less internal resistance of 0.37 kΩ was obtained from Nyquist analysis for R2 compared with the other two fabricated samples. Vibration testing experimentation showed an improved output voltage of the R2 sample (2.61 V at 9 Hz resonant frequency and 2.90 V for 1 g acceleration) comparatively. This also gave an increased sensitivity of 4.68 V/g confirming its better performance when compared to the other fabricated two samples.

Findings

Photoconductivity study confirms the formation of a p-n junction with less turn-on voltage for all the fabricated devices. A less internal resistance of 0.37 kΩ was calculated from the Nyquist plot. Vibration testing experimentation proves an increased sensitivity of 4.68 V/g confirming its better performance when compared to the other fabricated two samples.

Originality/value

Vibration testing experimentation proves an increased sensitivity of 4.68 V/g for R2 confirming its better performance when compared to the other fabricated two samples.

中文翻译：

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使用刷新水热法生长的前体摩尔浓度变化的 ZnO 纳米结构制造振动传感器

目的

已经采用各种方法来改变氧化锌 (ZnO) 薄膜的振动传感特性以实现高灵敏度。本文旨在报告使用刷新水热法制备在刚性基板上生长的前体摩尔比浓度变化的 ZnO 纳米结构的实验研究。使用振动传感装置对这些制造的基于 ZnO 纳米结构的振动传感器的影响进行了实验研究。

设计/方法/途径

ZnO 纳米结构已使用低温辅助刷新水热法生长，具有不同的前体摩尔浓度 0.025 M (R1)、0.075 M (R2) 和 0.125 M (R3)。聚 3,4-乙烯二氧噻吩聚苯乙烯磺酸盐，一种 p 型材料，被旋涂在生长的 ZnO 纳米结构上。结构分析显示 (002) 平面的强度增加，R2 和 R3 样品的 c 轴取向相对更好。形态学检查显示了在增加前体摩尔浓度时生长的纳米结构的变化。随着前体摩尔浓度的增加，光学带隙值从 3.11 eV 降低到 3.08 eV。光电导研究证实，所有制造的器件都形成了具有较低导通电压的 pn 结。更小的内阻为0。与其他两个制造的样品相比，R2 的奈奎斯特分析获得了 37 kΩ。振动测试实验表明，R2 样品的输出电压相对有所改善（9 Hz 谐振频率时为 2.61 V，1 g 加速度时为 2.90 V）。这也增加了 4.68 V/g 的灵敏度，证实其与其他制造的两个样品相比具有更好的性能。

发现

光电导研究证实，所有制造的器件都形成了具有较低导通电压的 pn 结。从奈奎斯特图计算出较小的内部电阻 0.37 kΩ。振动测试实验证明灵敏度增加了 4.68 V/g，证实其与其他制造的两个样品相比具有更好的性能。

原创性/价值

振动测试实验证明 R2 的灵敏度增加了 4.68 V/g，证实其与其他制造的两个样品相比具有更好的性能。