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Comparison of Thermal Annealing versus Hydrothermal Treatment Effects on the Detection Performances of ZnO Nanowires
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-02-18 , DOI: 10.1021/acsami.0c19170
Oleg Lupan 1, 2, 3, 4 , Nicolae Magariu 3 , Rasoul Khaledialidusti 5 , Abhishek Kumar Mishra 6 , Sandra Hansen 2 , Helge Krüger 2 , Vasile Postica 3 , Helge Heinrich 4, 7 , Bruno Viana 1 , Luis Katsuya Ono 4 , Beatriz Roldan Cuenya 4, 8 , Lee Chow 4 , Rainer Adelung 2 , Thierry Pauporté 1
Affiliation  

A comparative investigation of the post-electroplating treatment influence on the gas detecting performances of single ZnO nanorod/nanowire (NR/NW), as grown by electrochemical deposition (ECD) and integrated into nanosensor devices, is presented. In this work, hydrothermal treatment (HT) in a H2O steam and conventional thermal annealing (CTA) in a furnace at 150 °C in ambient were used as post-growth treatments to improve the material properties. Herein, the morphological, optical, chemical, structural, vibrational, and gas sensing performances of the as-electrodeposited and treated specimens are investigated and presented in detail. By varying the growth temperature and type of post-growth treatment, the morphology is maintained, whereas the optical and structural properties show increased sample crystallization. It is shown that HT in H2O vapors affects the optical and vibrational properties of the material. After investigation of nanodevices based on single ZnO NR/NWs, it was observed that higher temperature during the synthesis results in a higher gas response to H2 gas within the investigated operating temperature range from 25 to 150 °C. CTA and HT or autoclave treatment showed the capability of a further increase in gas response of the prepared sensors by a factor of ∼8. Density functional theory calculations reveal structural and electronic band changes in ZnO surfaces as a result of strong interaction with H2 gas molecules. Our results demonstrate that high-performance devices can be obtained with high-crystallinity NWs/NRs after HT. The obtained devices could be the key element for flexible nanoelectronics and wearable electronics and have attracted great interest due to their unique specifications.

中文翻译:

热退火水热处理对ZnO纳米线检测性能影响的比较

进行了电镀后处理对通过电化学沉积(ECD)生长并集成到纳米传感器器件中的单个ZnO纳米棒/纳米线(NR / NW)气体检测性能影响的比较研究。在这项工作中,H 2中的水热处理(HT)在环境温度为150°C的熔炉中使用O蒸汽和常规热退火(CTA)作为生长后处理,以改善材料性能。在此,对电沉积和处理后的标本的形态,光学,化学,结构,振动和气体传感性能进行了研究和详细介绍。通过改变生长温度和生长后处理的类型,可以保持形态,而光学和结构性质显示出增加的样品结晶。结果表明,H 2 O蒸气中的HT影响材料的光学和振动特性。在研究基于单个ZnO NR / NW的纳米器件后,观察到合成过程中较高的温度会导致对H 2的更高的气体响应所研究的工作温度范围为25至150°C的气体。CTA和HT或高压釜处理表明,所制备传感器的气体响应能力进一步提高了约8倍。密度泛函理论计算表明,由于与H 2气体分子强烈相互作用,ZnO表面的结构和电子能带发生了变化。我们的结果表明,在高温处理后,可以用高结晶度的NW / NR获得高性能的器件。所获得的设备可能是柔性纳米电子学和可穿戴电子设备的关键元件,并且由于其独特的规格而引起了极大的兴趣。
更新日期:2021-03-03
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