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70 results

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  • Quantifying Real-Time Sample Temperature Under the Gas Environment in the Transmission Electron Microscope Using a Novel MEMS Heater

  • Meng Li, De-Gang Xie, Xi-Xiang Zhang, Judith C. Yang, Zhi-Wei Shan
  • Journal:
    / Volume 27 / Issue 4 / August 2021
    Published online by Cambridge University Press:
    21 May 2021, pp. 758-766
    Print publication:
    August 2021

  • Accurate control and measurement of real-time sample temperature are critical for the understanding and interpretation of the experimental results from in situ heating experiments inside environmental transmission electron microscope (ETEM). However, quantifying the real-time sample temperature remains a challenging task for commercial in situ TEM heating devices, especially under gas conditions. In this work, we developed a home-made micro-electrical-mechanical-system (MEMS) heater with unprecedented small temperature gradient and thermal drift, which not only enables the temperature evolution caused by gas injection to be measured in real-time but also makes the key heat dissipation path easier to model to theoretically understand and predict the temperature decrease. A new parameter termed as “gas cooling ability (H)”, determined purely by the physical properties of the gas, can be used to compare and predict the gas-induced temperature decrease by different gases. Our findings can act as a reference for predicting the real temperature for in situ heating experiments without closed-loop temperature sensing capabilities in the gas environment, as well as all gas-related heating systems.

  • Preparation of a Model Platinum/Gamma-Alumina Catalyst for in situ Environmental TEM Experiments

  • Matthew McCann, Henry Ayoola, Judith C. Yang
  • Journal:
    / Volume 24 / Issue S1 / August 2018
    Published online by Cambridge University Press:
    01 August 2018, pp. 1096-1097
    Print publication:
    August 2018
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