The graph shows the characteristic peak of Melamine at different concentrations – from 0.1 to 0.01 ppm on SERSitive S-AgAu hydrophilic substrates.
According to what Rober Zimmerleiter said the concentration of 0.1 ppm is not the limit of detection of S-AgAu substrates.
Measurements were conducted by Robert Zimmerleiter from the company RECENDT GmbH
Laser wavelength: 785 nm
Laser power: 145 mW
Laser spot size: 150-170 µm
Integration time: 1000 ms
Raman Spectrometer: Wasatch Photonics
Lens magnification: No magnification was used, just a regular Raman-Probe
Sampling method: drop: “10µl of analyte were pipetted onto the substrate”
The substrate used: S-AgAu hydrophilic (interchangeably, you can use one of our substrates)
Dipl.‑Ing. Robert Zimmerleiter
RECENDT – Research Center for Non-Destructive Testing GmbH
Science Park 2, Altenberger Strasse 69, 4040 Linz, Austria
Tel.: +43 732-2468-4624