Development of Perovskite Quantum Dots for Two-Dimensional Temperature Sensors

Abstract

In situ temperature measurement for closed systems is always challenging due to various physical limitations. With the aim to visualize the heat transfer phenomena in situ continuously with a longer time scale, octylamine substituted CsPbBr3 perovskite quantum dots (QDs) are synthesized, leading to its thermo-sensitity being doubled. An optical-based 2D temperature sensor based on these ligand-modified QDs is developed, targeting microreactors and other circumstances where conventional thermal sensing protocols are not applicable. The developed method has the advantages of repeatability, long lifetime, low cost, fast response time, and broader applicability since it does not require IR transparent substrates. On top of these advantages, the proposed method also provides satisfactory spatial and temporal resolution, which is typically limited by the camera’s specification rather than the materials.

Luminescence Thermometry Beyond the Biological Realm

“…Brites et al 230 also used Eu 3+ /Tb 3+ codoped nanoparticles suspended in water to measure the temperature gradient imposed along a capillary tube with ∼65 μm spatial resolution (Figure 8b). Zhu et al 231 recently demonstrated 2D thermometry in microchannels using the temperature-dependent PL intensity of octylamine substituted CsPbBr 3 perovskite QDs, including transient measurements of laminar water flow, with ∼10 μm spatial resolution and 200 ms temporal resolution. As a potential strategy for thermometry in microfluidic devices that would not require dispersing luminescent nanomaterials in the fluid, Savchuk et al 232 developed PDMS/NaYF 4 :Yb 3+ ,Er 3+ composites suitable for ratiometric thermometry that also maintain the transparency of PDMS.…”