Dear colleagues,
I am looking for standardized measurement methods in UV-Vis spectroscopy to define optical properties of some nanostructured materials and coatings containing AgNPs and ZnONPs or TiO2NPs. I found out only some standards referring to spectrophotometer.
Thank you in advance.
Dr. Magdalena-Valentina Lungu
INCDIE ICPE-CA Bucharest, Romania
Dear Mrs. Lungu,
I am presently not active in the field but believe, to have some background in it. I have worked earlier on transmission and reflection on thin films and thermal emissivity.
The 1st thing to look at is, are the nanoparticles stable under all wavelength conditions: For AgNPs I would there not be so sure (think of old photographic film) for short wavelengths.
On the other hand, one thing to look at is also: In what kind of liquid or matrix are the nanoparticles insereted or are they pure? In the latter case, you may disregard this point, in the other cases you may make sure, the TiO2NPs have no light catalytic effect on the liquid or matrix material, since this would also alter your optical properties.
I am not sure, whether or not my comments are of help but this is, what I can say in short, perhaps you can leave me a note on that, no matter how it looks!
with best regards
Johannes Weiss
Dear Dr. Weiss,
Thank you very much for your kindness in sending this answer. Referring to the measurement methods using UV-Vis spectrophotometer I didn't have any problems to see on the absorbance curves the SPR band of AgNPs in AgNPs-ZnONPs and AgNPs-TiO2NPs composite powders, sputtering targets and nanostructured coatings.
I need to elaborate some technical specifications and I have to know the number and name of a standardized measurement method for materials (powders, sputtering targets and thin films/coatings) using UV-Vis spectroscopy. Up to now I didn't succeed to find out such standard.
Best regards.
Magdalena Lungu
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