  This paper demonstrates broadband and wide-temperature-range thermal emitter
with super-hydrophobicity based on an oxidized high-entropy film. The annealed
(NiCuCrFeSi)O high-entropy film can serve as a mid-infrared emitter due to its
three characteristics: i) High blackbody-like emission in a broadband
mid-infrared region from 2.5 um to 20 um; ii) High emittance (more than 90%) in
a wide temperature range from 300 K to 1000 K; iii) Super-hydrophobicity with
high contact angle (CA) of 151 degree and low title angle (TA) of 5 degree.
These characteristics originate from the recrystallization of as-deposited film
and formation of cavernous structure with a plethora of nanoscale polyhedrons
and holes after an annealing process, supported by the results of XRD and
SEM/EDX. This work may provide new ideas for applications of thermal emitters
operating at substantially wide temperature range.
