Ratiometric nanothermometry based on the phonon assisted anti-stokes luminescent materials

Publication Type:
Thesis
Issue Date:
2019
Full metadata record
Thermometers working at nanoscale provide new approaches of non-invasive temperature sensing with high spatial resolution to break the limitations in conventional methods. Over the past few decades, the developing of nanothermometry has been accelerated by the numerous challenging requests arising from the advanced areas like microelectronics, and nanomedicine. As nanothermometry can give the basic information on the temperature distribution of micrometric and nanostructured systems whose dynamic state is determined by temperature, the comprehensive studying on the performance of such small systems can be carried out in this way. Based on the current literatures, the most studied nanothermometers can be grouped in two major categories: luminescent and non-luminescent nanothermometers. Luminescent thermometers is due to their temperature-dependent optical properties, which widely exist in luminescent nanomaterials including QDs, RE doped nanoparticles, artificial biomolecules, organic dyes, as well as hybrid polymeric nanomaterials and organic–inorganic hybrid materials. Non-luminescent thermometers contains the scanning thermal microscopy that combines the techniques of probe scanning microscope with nanoscale thermocouples or thermal resistance, while the temperature is determined by the electrical signal change of the nanoscale thermal sensors as scanning probes. This thesis summarizes different kinds of luminescent nanothermometers and their unique thermometric properties including temperature induced spectra position shift, emission intensity change and luminescent lifetime change. Also, the development of probe scanning microscope is introduced in the first section. In the second section, on one hand, the advantages of RE doped anti-Stokes luminescent materials working as nanothermometers are described based on the literature review, and on the other hand the aim of this thesis is established to solve the current problems in the developing of ultra-sensitive RE doped anti-Stokes luminescent nanothermometers. By developing the thermal induced emission enhancement in RE doped nanoparticles, the performance of luminescent nanothermometers at high temperature have been largely improved. Based on this investigation, a new generation of ratiometric nanothermometers is created with a high sensitivity. More significantly, the luminescence nanothermometry demonstration shows the high spatial resolution and high accuracy in the temperature sensing by the created RE doped anti-Stokes luminescent nanothermometers.
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