Broadband and wide-temperature-range thermal emitter with super-hydrophobicity based on oxidized high-entropy film

TL;DR

This study presents a broadband, wide-temperature-range thermal emitter with super-hydrophobicity based on oxidized high-entropy films, suitable for mid-infrared applications from 300 K to 1000 K.

Contribution

It introduces a novel high-entropy film-based thermal emitter with super-hydrophobicity and broadband mid-infrared emission, demonstrating wide-temperature operation and unique surface properties.

Findings

High emittance (>90%) from 2.5 to 20 micrometers

Super-hydrophobic surface with contact angle of 151°

Effective operation from 300 K to 1000 K

Abstract

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.