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Nano-FTIR - A new era in modern analytical chemistry
Date:7/27/2012

minant (B) can be found next to a thin film of PMMA (A) on a Si substrate (dark region). In the mechanical phase image (middle) the contrast already indicates that the particle consists of a different material than the film and the substrate. Comparing the nano-FTIR absorption spectra at the positions A and B (right panel) with standard IR databases reveals the chemical identity of the film and the particle. Each spectrum was taken in 7 minutes with a spectral resolution of 13 cm-1.

For example, nano-FTIR can be applied for the chemical identification of nanoscale sample contaminations. Fig. 1 shows AFM images of a PMMA film on a Si surface. While the AFM phase contrast indicates the presence of a 100 nm size contamination, the determination of its chemical identity remains elusive from these images. Using nano-FTIR to record a local infrared spectrum in the center of the particle and comparing it with standard FTIR database spectra, the contamination can be identified as a PDMS particle.
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Contact: Rainer Hillenbrand
r.hillenbrand@nanogune.eu
Elhuyar Fundazioa
Source:Eurekalert  

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