A New Strategy to Minimize Humidity Influences for Acoustic Wave Ultraviolet Sensor Using ZnO Nanowires Wrapped with Hydrophobic Silica Nanoparticles

Gao, Yihao, Zhou, Jian, Ji, Zhangbin, Liu, Yanghui, Cao, Rongtao, Zhou, Fengling, Tan, Kaitao, Duan, Huigao and Fu, Yong Qing (2022) A New Strategy to Minimize Humidity Influences for Acoustic Wave Ultraviolet Sensor Using ZnO Nanowires Wrapped with Hydrophobic Silica Nanoparticles. Microsystems and Nanoengineering. ISSN 2055-7434 (In Press)

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Abstract

Surface acoustic wave (SAW) technology has been widely developed for ultraviolet (UV) detection due to its advantages of miniaturization, portability, potential to be integrated with microelectronics, and passive/wireless capabilities. To enhance UV sensitivities, nanowires (NWs) such as ZnO are often applied to enhance SAW based UV detection, due to their highly porous and interconnected 3D network structures and good UV sensitivity. However, ZnO NWs are normally hydrophilic, and thus changes of environmental parameters such as humidity will significantly influence the detection precision and sensitivity of the SAW based UV sensors. To solve this issue, in this work, we proposed a new strategy using ZnO NWs wrapped with hydrophobic silica nanoparticles as the effective sensing layer. Analysis of distribution and chemical bonds of these hydrophobic silica nanoparticles showed that numerous C-F bonds (which are hydrophobic) were found on the surface of sensitive layer, which effectively block the adsorption of water molecules onto the ZnO NWs. This new sensing layer design endows the ZnO NWs based UV sensor with a minimized humidity interference within the relatively humidity range between 10 and 70. The sensor showed a UV sensitivity of 9.53 ppm (mW/cm2)-1, with a high linearity (R2 value is 0.99904), small hysteresis (less than 1.65) and a good repeatability. This work solves the long-term dilemma for ZnO NWs based sensors which are often sensitive to humidity changes.

Item Type: Article
Additional Information: Funding information: This work was supported by the NSFC (No.52075162), The Program of New and High-tech Industry of Hunan Province(2020GK2015, 2021GK4014), The Joint Fund Project of the Ministry of Education, The Excellent Youth Fund of Hunan Province (2021JJ20018), the Key Research & Development Program of Guangdong Province (2020B0101040002), the Engineering Physics and Science Research Council of UK (EPSRC EP/P018998/1) and International Exchange Grant (IEC/NSFC/201078) through Royal Society and the NSFC.
Uncontrolled Keywords: Humidity Insensitivity, SAW device, ZnO Nanowires, UV sensor
Subjects: F200 Materials Science
F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 08 Sep 2022 14:42
Last Modified: 08 Sep 2022 14:45
URI: https://nrl.northumbria.ac.uk/id/eprint/50071

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