Advancing nanoscale temperature measurement in TEM with lanthanide-doped heavy-metal oxide


Mar 07, 2024

(Nanowerk Information) A groundbreaking methodology for measuring the temperature of nanometer-sized samples inside a transmission electron microscope (TEM) has been developed by Professor Oh-Hoon Kwon and his analysis workforce within the Division of Chemistry at UNIST. This revolutionary expertise, using nano-thermometers primarily based on cathodoluminescence (CL) spectroscopy, opens up new potentialities for analyzing the thermodynamic properties of fantastic samples and advancing the event of high-tech supplies.

The findings of this analysis have been printed in ACS Nano (“Nanoscale Cathodoluminescence Thermometry with a Lanthanide-Doped Heavy-Metallic Oxide in Transmission Electron Microscopy”).

Schematic illustration of the cathodoluminescence (CL) nanothermometry

Schematic illustration of the cathodoluminescence (CL) nanothermometry. (Picture: UNIST)

The transmission electron microscope permits researchers to look at samples at a magnification of tons of of hundreds of occasions by transmitting a short-wavelength electron beam by means of the pattern. By detecting mild emitted from the pattern by means of cathode ray emission spectroscopy, researchers can finely analyze the bodily and optical properties of the pattern at nanometer scales.

The newly developed nano-thermometers depend on the temperature-dependent depth variation of a selected cathode ray emission band of europium ions (Eu3+). By synthesizing nanoparticles doped with europium ions inside gadolinium oxide (Gd2O3), the analysis workforce ensured minimal injury from the electron beam, enabling long-term experiments.

By way of dynamic evaluation, the workforce confirmed that the depth ratio of the sunshine emitting band from europium ions is a dependable indicator of temperature, with a powerful measurement error of about 4 °C utilizing nano thermometer particles measuring roughly 100 nanometers in dimension. This methodology gives greater than twice the accuracy of standard TEM temperature measurement strategies and considerably improves spatial decision.

Moreover, the workforce demonstrated the applicability of the nano-thermometers by inducing temperature adjustments with a laser throughout the TEM and concurrently measuring temperature and structural variations in real-time. This functionality permits for the evaluation of thermodynamic properties on the nanometer degree in response to exterior stimuli, with out interfering with normal TEM evaluation procedures.

Received-Woo Park, the primary creator of the research, emphasised the non-invasive nature of the temperature measurement course of, highlighting that the interplay between the transmission electron beam and the nano-thermometer particles allows real-time temperature detection with out disrupting TEM imaging. He famous, “The massive benefit of the developed nanometer is that the temperature measurement course of doesn’t intrude with the prevailing transmission electron microscope evaluation,” including, “Since temperature is measured utilizing mild, a by-product generated by the interplay between the transmission electron beam and the nanometer particle, it’s doable to measure the picture of the transmission electron microscope and detect the temperature in actual time.”

Professor Kwon underscored the importance of this analysis, stating that “The developed temperature measurement indicators, when mixed with real-time imaging strategies, facilitate the commentary of native temperature adjustments in response to exterior stimuli.” He additional said, “This development is poised to considerably contribute to the event of high-tech supplies corresponding to secondary batteries and shows.”


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