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Area of Science:

Spectroscopy
Materials Science
Nanotechnology

Background:

Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) is crucial for material analysis.
Existing methods often lack the spatial resolution for micro-scale samples.
Characterizing small, complex structures requires advanced spectroscopic techniques.

Purpose of the Study:

To develop and validate a cost-effective micro-DRIFTS system.
To assess the system's performance on small-area diffuse samples.
To enable detailed analysis of micro-scale materials, such as vertically aligned carbon nanotubes.

Main Methods:

Development of a novel micro-diffuse reflectance infrared Fourier transform spectroscopic (micro-DRIFTS) setup.
System calibration and performance characterization using standard and target samples.
Application of the micro-DRIFTS system to analyze small-area vertically aligned carbon nanotube (VACNT) samples.

Main Results:

The developed micro-DRIFTS system achieves a spatial resolution of approximately 140 µm.
Sensitivity levels in the tens of parts per million (ppm) were demonstrated within the 2 µm - 18 µm spectral range.
The system successfully measured reflectance from small-area VACNT samples.
An uncertainty budget was established, and a method for equating measured reflectance to directional-hemispherical reflectance was presented.

Conclusions:

The low-cost micro-DRIFTS system provides a viable tool for analyzing micro-scale diffuse samples.
The system's high spatial resolution and sensitivity are suitable for characterizing nanomaterials like VACNTs.
This development advances the capability for detailed spectroscopic analysis of small and complex material structures.