Fabrication of CsPbBr3 nanocrystal/POSS-based copolymer films for non-contact temperature probes

Abstract

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 CsPbBr3/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 CsPbBr3/POSS-based composite films with different CsPbBr3 morphologies and ratios were fabricated. The CsPbBr3 nanocubic and nanoplate based films possessed high hydrophobicity, UV stability, and thermal stability. Temperature dependence experiments revealed that PL spectral parameters of CsPbBr3/POSS-based composite films had obvious temperature change characteristics attributable to the CsPbBr3 morphology. The PL intensity and full width at half maximum (FWHM) of the CsPbBr3 nanoplate based film exhibited poor regularity with temperature. In contrast, the PL intensity of the CsPbBr3 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 CsPbBr3 nanocubic based film. Furthermore, the applicability of a CsPbBr3 nanocubic based temperature probe was verified by monitoring the temperature of a bearing cage on a spindle-bearing test platform. The CsPbBr3/POSS-based composites can be applied as temperature probes for non-contact temperature measurement of rotating components of mechanical equipment.