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Updated: Jul 20, 2025

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

Published on: June 18, 2020

Polycrystalline Diamond Micro-Hotplates.

Evan L H Thomas¹, Jaspa Stritt¹, Soumen Mandal¹

¹School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff, CF24 3AA, UK.

Small (Weinheim an Der Bergstrasse, Germany)

|August 2, 2023

Summary

This summary is machine-generated.

Boron-doped diamond micro-hotplates overcome thermal limitations, reaching over 2700 K. These robust devices offer rapid response times for advanced applications in gas sensing and imaging.

Keywords:

carbon diamonds micro-electro-mechanical systems (MEMS)micro-hotplate

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Last Updated: Jul 20, 2025

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Micro-hotplate devices are crucial for applications like gas sensors and high-resolution imaging.
Conventional micro-hotplates fail above 1600 K due to thermal expansion mismatches and electro-migration.

Purpose of the Study:

To develop micro-hotplates with enhanced thermal stability and performance.
To investigate boron-doped polycrystalline diamond as a material for next-generation micro-hotplates.

Main Methods:

Fabrication of micro-hotplates from a single layer of boron-doped polycrystalline diamond with varying geometries.
Testing under high vacuum conditions, including emission spectra characterization and thermalization time measurements.
Raman spectroscopy analysis to understand performance degradation mechanisms.

Main Results:

Diamond micro-hotplates reached temperatures exceeding 2731 K at low power (<=100 mW).
Devices exhibited grey-body like emission spectra and rapid millisecond thermal response times.
Raman spectroscopy indicated cumulative graphitization limits device performance at high temperatures.

Conclusions:

Boron-doped polycrystalline diamond is a promising material for high-temperature micro-hotplate fabrication.
The single-layer diamond design mitigates issues associated with CTE mismatch and electro-migration.
Future work should focus on mitigating graphitization to further enhance device longevity.