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Pivotal role of nucleation layers in the hydrothermally-assisted growth of ZnO and its H2 gas sensing performance
Sensors and Actuators B: Chemical ( IF 8.4 ) Pub Date : 2022-08-10 , DOI: 10.1016/j.snb.2022.132499
Özlem Barin , Ahmad Ajjaq , Ali Orkun Çağırtekin , Irmak Karaduman Er , Memet Ali Yıldırım , Aytunç Ateş , Selim Acar

Although hydrogen is a non-poisonous gas that can dissipate quickly once is released, it causes suffocation at high concentrations and is very risky on some occasions if not suitably handled. In this study, an effective approach was suggested for developing and tuning hydrogen gas sensors, where the crucial effect of nucleation layers and chemical stabilizing agents on the morphology of hydrothermally-assisted growth and its gas sensing performance was demonstrated. For this purpose, ZnO seed layers were separately synthesized by different solution-based chemical processes based on the successive ionic layer adsorption and reaction, spin, and dip coating techniques followed by a hydrothermal treatment under the same conditions. X-ray diffraction measurements revealed that all the synthesized samples have a similar pure hexagonal wurtzite structure with a big difference in the degree of textural orientation along the c-axis of ZnO. Optical transmittances, forbidden bandgap energies, and Urbach energies of the produced samples were influenced to a great extent by the coating techniques and the chemical solutions used. Aside from that, the morphology of the synthesized samples and their overall thicknesses together with the available oxygen vacancies detected by X-ray photoelectron spectroscopy changed considerably. The change in structure and morphology have influenced the wettability of the synthesized samples. They have also greatly influenced the gas sensing performance of the sensors in terms of optimal working temperature, sensitivity, and response/recovery periods. The hydrogen gas detection mechanism of the fabricated sensors and the logic behind the change that occurred in gas sensing performance based on morphology are discussed.



中文翻译:

成核层在 ZnO 水热辅助生长中的关键作用及其 H2 气体传感性能

虽然氢气是一种无毒气体,一旦释放就会迅速消散,但在高浓度时会导致窒息,如果处理不当,在某些情况下是非常危险的。在这项研究中,提出了一种开发和调整氢气传感器的有效方法,其中证明了成核层和化学稳定剂对水热辅助生长的形态及其气体传感性能的关键影响。为此,基于连续的离子层吸附和反应、旋涂和浸涂技术,然后在相同条件下进行水热处理,通过不同的溶液化学工艺分别合成 ZnO 种子层。X 射线衍射测量表明,所有合成的样品都具有相似的纯六方纤锌矿结构,但沿 ZnO 的 c 轴的织构取向程度存在很大差异。所制备样品的透光率、禁带隙能量和 Urbach 能量在很大程度上受涂层技术和所用化学溶液的影响。除此之外,合成样品的形态及其整体厚度以及通过 X 射线光电子能谱检测到的可用氧空位发生了很大变化。结构和形态的变化影响了合成样品的润湿性。它们还极大地影响了传感器在最佳工作温度、灵敏度和响应/恢复期方面的气体传感性能。

更新日期:2022-08-15
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