Interpreting UV absorption spectra

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SUMMARY

The discussion centers on the interpretation of UV absorption spectra for nanocrystallites using a Shimadzu spectrometer with ethanol as a solvent. The user reports unexpected additional peaks in their spectra, contrasting with literature that presents smooth curves. The response highlights that the presence of these peaks may be due to variations in material preparation or the selection of specific spectral windows, rather than unethical data manipulation.

PREREQUISITES
  • Understanding of UV-Vis spectroscopy principles
  • Familiarity with Shimadzu spectrometers
  • Knowledge of nanocrystallite properties and synthesis
  • Experience with data analysis techniques in spectroscopy
NEXT STEPS
  • Research methods for preparing nanocrystallites to minimize defects
  • Learn about spectral window selection in UV-Vis spectroscopy
  • Investigate non-linear regression techniques for spectral data analysis
  • Explore literature on UV absorption spectra interpretation for nanomaterials
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Researchers in materials science, chemists analyzing nanocrystallites, and anyone involved in UV-Vis spectroscopy data interpretation.

nana_yaw
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hello all

i'm investigating the band gap of certain nanocrystallites in the powder form, using a Shimadzu spectrometer with the powder dissolved in ethanol. The spectra, however, come with several peaks in addition to the expected peak for absorption. This is not unexpected as transitions to defects and impurities should arise. What i don't understand is that the literature only reports smooth curves for similar work...!

is it that the other peaks are removed, or a non-linear regression is used to analyze the data?

please help?

nana_yaw
 
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It is very unlikely (and unethical) that researchers would have removed peaks from their data in a publication and not mentioned it. Without seeing the references in question, it is impossible to tell for sure what is happening, but some explanations include: different details of material preparation leading to different properties, selecting spectral windows where the peaks in question do not appear, etc.
 

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