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A technique to measure hydrogen absorption in isolated nanometer structures.

A B Phillips¹, B S Shivaram

¹Department of Physics, University of Virginia, Charlottesville, Virginia 22901, USA.

The Review of Scientific Instruments

|February 6, 2008

Summary

A new apparatus uses surface acoustic wave (SAW) sensors to measure hydrogen absorption in nanomaterials. This sensitive method detects low hydrogen uptake in nanogram samples at room temperature.

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Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Accurate measurement of hydrogen absorption is crucial for developing advanced materials.
Existing methods may lack sensitivity or require complex sample preparation.
Nanoscale entities present unique challenges for gas sorption analysis.

Purpose of the Study:

To develop a sensitive apparatus for measuring hydrogen absorption on nanoscale entities.
To demonstrate the capability of surface acoustic wave (SAW) sensors for this application.
To present results for specific nanomaterials using the developed apparatus.

Main Methods:

Assembly of an apparatus utilizing high-frequency surface acoustic wave (SAW) sensors.
Measurement of hydrogen uptake on monolayer samples of nanometer-scale entities.
Utilizing 315 MHz SAW resonators for hydriding rare earth metal nanoparticles and transition metal-carbon complexes.

Main Results:

Achieved a sensitivity of 4 picograms (pg).
Enabled detection of hydrogen uptake below 1% in nanogram-level samples.
Successfully measured hydrogen absorption in rare earth metal nanoparticles and a transition metal-carbon complex at room temperature.

Conclusions:

The developed apparatus provides a highly sensitive method for hydrogen absorption studies on nanomaterials.
The use of readily available SAW sensors offers a cost-effective and versatile solution.
The apparatus design is general and adaptable to various commercial SAW sensors and nanomaterials.