[Raman Application] ZnO nanowires
The influence of polythyleneimine and ammonium on the growth of ZnO nanowires by hydrothermal method by MRI
Trace chemical analysis by surface enhanced Raman spectroscopy (SERS) is made quick and easy with sample vials containing the chemical of interest is simple placed into the vial, which is then analyzed using a Raman spectrometer. Raman signals are increased in some cases more than 1 million times allowing measurements of samples concentration as low as 10 ppb.
In this study, ZnO nanowire arrays were prepared using a hydrothermal method. During growth, Polytheyleneinime (PEI) and ammonia were added to adjust the structure and optical properties of ZnO nanowires. Emission analysis revealed visible photoluminescence emission from ZnO nanowires produced under various growth conditions. To correlate the relationship between visible emissions and structural defects in ZnO nanowires, we employed X-ray absorption spectroscopy (XAS) to characterize the coordination number and bond length of the ZnO nanowire.
Based on analytical results, we determined that the red emission is attributed to interstitial zinc defects (Zni) and the yellow emission is attributed to interstitial oxygen defects (Oi), which is corresponding to that both PL and Raman results.