Fabrication of CsPbBr 3 nanocrystal/POSS-based copolymer films for non-contact temperature probes

Fluorescence-based non-contact temperature measurement has been attested a widely-used technique for temperature aware in rotating mechanical equipment, electrical devices, and other fields. Inspired by the thermal sensitivity of perovskite nanocrystals, we prepared a CsPbBr 3 /polyhedral oligomeric silsesquioxane (POSS)based composite film with outstanding temperature-photoluminescence (PL) dependence, high reversibility, and high hydrophobicity. Perovskites nanocrystals with controllable nanocubic and nanoplate morphologies were synthesized by adjusting the temperature. Various CsPbBr 3 /POSS-based composite films with different CsPbBr 3 morphologies and ratios were fabricated. The CsPbBr 3 nanocubic and nanoplate based films possessed high hydrophobicity, UV stability, and thermal stability. Temperature dependence experiments revealed that PL spectral parameters of CsPbBr 3 /POSS-based composite films had obvious temperature change characteristics attributable to the CsPbBr 3 morphology. The PL intensity and full width at half maximum (FWHM) of the CsPbBr 3 nanoplate based film exhibited poor regularity with temperature. In contrast, the PL intensity of the CsPbBr 3 nanocubic based film was related to temperature exponentially, and the FWHM had a strong linear relationship with temperature. Moreover, temperature dependence reversibility was realized for the CsPbBr 3 nanocubic based film. Furthermore, the applicability of a CsPbBr 3 nanocubic based temperature probe was verified by monitoring the temperature of a bearing cage on a spindle-bearing test platform. The CsPbBr 3 /POSS- based composites can be applied as temperature probes for non-contact temperature measurement of rotating components of mechanical equipment.