Abstract
In recent years, high-entropy oxides (HEOs) have gained significant attention due to their unique structure, yet the usage of HEOs in gas/humidity sensing is still a vast expanse of land worthy of vigorous cultivation. Here, HEOs were designed via high-entropy metal-organic frameworks (HE-MOFs) as sacrificial templates and then calcined at different temperatures to obtain (YTbDyErYb)2O3 (named as HEO-600, HEO-700 and HEO-800). After material characterization, as-synthesized HEOs were explored as humidity sensing materials for the first time at a relative humidity (RH) range of 11%-97%. The HEO-700 sensor exhibits the optimized properties featured in a response of three orders of magnitude (2.8 × 103) and extremely short response time (2 s). The excellent humidity sensing performance of HEO-700 can be attributed to the large surface area (39.6 m2/g) and abundant oxygen vacancies (53.1%). In addition, the HEO-700 sensor demonstrates great potential in real-time human physiological moisture detection, such as finger, breath, and non-contact switch. It is believed that this contribution provides attracting humidity sensing candidate for practical applications, and moreover, will provide inspiration for design of new HEOs in this emerging field of solid-state sensory devices.
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