Abstract
Ultraviolet (UV) sensors offer significant advantages in human health protection and environmental pollution monitoring. Amongst various materials for UV sensors, the zinc oxide (ZnO) nanostructure is considered as one of the most promising candidates due to its incredible electrical, optical, biomedical, energetic and preparing properties. Compared to other fabricating techniques, hydrothermal synthesis has been proven to show special advantages such as economic cost, low-temperature process and excellent and high-yield production. Here, we summarize the latest progress in research about the hydrothermal synthesis of ZnO nanostructures for UV sensing. We particularly focus on the selective hydrothermal processes and reveal the effect of key factors/parameters on ZnO architectures, such as the laser power source, temperature, growth time, precursor, seeding solution and bases. Furthermore, ZnO hydrothermal nanostructures for UV applications as well as their mechanisms are also summarized. This review will therefore enlighten future ideas of low-temperature and low-cost ZnO-based UV sensors.
Highlights
Ultraviolet (UV) light provides a special benefit on the well-being of humans by killing microorganisms
This paper provides an overview of the recent developments in zinc oxide (ZnO) nanostructure synthesis for UV sensors, the hydrothermal synthesis
To investigate the influence of the temperature on ZnO nanowires, Amin et al conducted a hydrothermal growth of nanorods in aqueous solution with a constant pH, specific growth time (t = 5 h) and a fixed precursor concentration (100 mM), and the growth temperature was changed from 50 ◦ C to 110 ◦ C [64]
Summary
Ultraviolet (UV) light provides a special benefit on the well-being of humans by killing microorganisms. Among various wet chemical methods, the hydrothermal process is regarded as one of the most attractive methods for ZnO fabrication as it is facile to set up and is controllable, cost-effective, relatively low temperature and an environment benign process [39,48,64,65] Many different approaches such as resistive nano heater [24,66,67], Materials 2021, 14, 4083 bulk heating [61,68], microcontact printing [17,63,69,70,71], inkjet printing [17,57,62,72,73] and laser-induced heating [44,46,61,68,74,75] have been developed via the hydrothermal method. This review may provide a better comprehension of the current research status for hydrothermal ZnO-based applications
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