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Graphene Microheater Chips for In Situ TEM.

Jie Zhao1, Liang Liang1, Shiyi Tang1

  • 1State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, People's Republic of China.

Nano Letters
|December 14, 2022
PubMed
Summary

Researchers developed a novel graphene microheater chip for transmission electron microscopy (TEM) enabling rapid heating to 800 °C with minimal sample distortion. This advancement enhances in-situ TEM characterization of materials. Keywords: graphene microheater, TEM, in-situ heating.

Keywords:
Joule heatingchipgraphenein situ TEMmicroheater

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Transmission Electron Microscopy (TEM) characterization is crucial for understanding material properties at the nanoscale.
  • Existing in-situ heating methods for TEM often suffer from slow heating rates and significant sample bulging, limiting their applicability.
  • Low-dimensional materials offer unique properties that can be leveraged to overcome current limitations in characterization techniques.

Purpose of the Study:

  • To develop a novel graphene-based microheater chip for high-performance in-situ TEM heating.
  • To investigate the heating capabilities and thermal stability of the graphene microheater.
  • To demonstrate the utility of the device for observing dynamic processes at the nanoscale.

Main Methods:

  • Fabrication of a microheater chip by stacking graphene on a suspended silicon nitride (SiN) membrane.
  • Utilizing Joule heating for rapid temperature increase.
  • Characterizing heating performance, including temperature, heating rate, and bulging, using TEM.
  • Observing the tin (Sn) melting process as a model thermodynamic process.

Main Results:

  • The graphene microheater achieved temperatures up to 800 °C in 26.31 ms with low power consumption (0.025 mW/1000 μm²).
  • Sample bulging was minimal (∼50 nm at 650 °C), significantly less than conventional MEMS heaters.
  • Graphene's properties, including low heat capacity and van der Waals contact, contributed to superior performance.
  • Successful observation of the Sn melting process demonstrated the chip's potential for dynamic studies.

Conclusions:

  • The developed graphene microheater chip offers unprecedented rapid heating and minimal distortion for in-situ TEM.
  • This technology significantly advances the capabilities for resolving dynamic thermodynamic processes in materials.
  • The platform provides a foundation for developing multifunctional chips for advanced nanoscale characterization.