Limitations of Bulk Diamond Sensors for Single-Cell Thermometry

Area of Science:

• Physics
• Biophysics
• Materials Science

Background:

• Accurate temperature measurement in single cells is crucial for understanding cellular processes.
• Optical techniques are employed for non-invasive temperature monitoring.
• Previous studies established baseline heat dissipation requirements for glassy substrates.

Purpose of the Study:

• To analyze the thermal behavior of a single cell on a bulk diamond substrate using Finite Element Method (FEM).
• To compare the temperature increase on diamond versus glassy substrates.
• To evaluate the suitability of bulk diamond for sensitive temperature measurements in cellular studies.

Main Methods:

• Finite Element Method (FEM) simulation.
• Uniform power density approximation.
• Steady-state and transient thermal analysis.

Main Results:

• A single cell on a glassy substrate requires significant heat power for a 1 K temperature increase.
• On a diamond substrate, the maximum temperature increase at the interface is significantly lower (4.6×10-4 K).
• The transient decay time for temperature on diamond is approximately 250 μs.

Conclusions:

• Bulk diamond substrates are not advantageous for single-cell temperature measurements due to extremely low temperature increases.
• Potential benefits like coherence time and spectral properties do not outweigh the thermal limitations.
• Current bulk diamond substrates are unsuitable for applications requiring sensitive thermal detection in cellular environments.