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Femtogram-level chemical measurements now possible, U. of I. team reports
Date:3/27/2008

ars, said Rohit Bhargava, a professor of bioengineering. Our method combines atomic force microscopy with spectroscopic imaging to provide data that can be rapidly used for spectral analyses for exceptionally small sample sizes.

To clean the tip for reuse, the tip is heated to well above the decomposition temperature of the sample a technique similar to that used in self-cleaning ovens.

Since the tip can be heated to 1,000 degrees Celsius, most organic materials can be readily vaporized and removed in this manner, King said.

As a demonstration of the technique, the researchers scanned a piece of paraffin with their probe, and removed a sample for analysis. They then used Raman and Fourier transform infrared spectroscopy to chemically analyze the sample. After analysis, the paraffin was removed by thermal decomposition, allowing reuse of the probe.

We anticipate this approach will help bridge the gap between nanoscale structural analysis and conventional molecular spectroscopy, King said, and in a manner widely useful to most analytical laboratories.


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Contact: James E. Kloeppel
kloeppel@uiuc.edu
217-244-1073
University of Illinois at Urbana-Champaign
Source:Eurekalert

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