Three-Dimensional Nanothermistors for Thermal Probing.

Area of Science:

• Materials Science
• Nanotechnology
• Instrumentation

Background:

• High thermal and lateral resolution are crucial for characterizing small-scale materials and devices.
• Scanning thermal microscopy (SThM) is a key technology for sub-100 nm thermal analysis.
• Nanoprobe design significantly impacts SThM performance.

Purpose of the Study:

• To introduce a novel three-dimensional (3D) nanoprobe concept for surface temperature measurement.
• To enable high-resolution thermal property access in advanced research and development.
• To address the growing need for precise thermal instrumentation in miniaturized systems.

Main Methods:

• Fabrication of nanobridges using 3D nanoprinting with focused electron beams.
• Mechanical stability analysis via finite-element simulation and in situ atomic force microscopy (AFM).
• Material tuning for enhanced wear resistance at the tip apex.

Main Results:

• Mechanically stable 3D nanobridges with vertical stiffness up to 50 N m^-1 were designed.
• Demonstrated a negative temperature coefficient of -(0.75 ± 0.2) 10^-3 K^-1.
• Achieved sensing rates of 30 ± 1 ms K^-1 with noise levels of ±0.5 K.

Conclusions:

• The developed 3D nanoprobe concept shows significant potential for high-resolution thermal measurements.
• The fabrication method allows direct-write integration onto self-sensing cantilevers.
• The probe design and material tuning enhance stability and imaging quality for advanced applications.