Zinc oxide (ZnO) phonon wavenumbers: combination modes

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doi:10.1007/10681719_292

Cited by 1 publication

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“…The binding of aminoalcoholate ligands to the ZnO surface results in the substantial spectral differences due to the core–ligand interactions, and the most pronounced differences in the spectra of QDs and proligands are observed in the two regions, i.e., 350–500 and 950–1150 cm –1 . The low wavenumber region is characteristic for the ZnO modes ,, and thus is especially important for the analysis. The second region is dominated by the coating aminoalcoholate ligand vibrations , and contains the most intensive bands observed for all studied ligands (Figure and Figure S21), but in some instances, the ZnO combination modes and overtones are present .…”

Section: Resultsmentioning

confidence: 99%

“…Both B 1 (low) and B 1 (high) modes are normally silent, while A and E modes are polar and split into transverse optical (TO) and longitudinal optical (LO) phonons. − In relation to the selection rules, A 1 , E 1 , and E 2 modes are Raman active while B 1 is forbidden. All these Raman active phonon modes can be recognized as the characteristic bands of ZnO hexagonal wurtzite phase in the low wavenumber region (350–500 cm –1 ) …”

Section: Resultsmentioning

confidence: 99%

“…All these Raman active phonon modes can be recognized as the characteristic bands of ZnO hexagonal wurtzite phase in the low wavenumber region (350–500 cm –1 ). 66 …”

Section: Resultsmentioning

confidence: 99%

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Direct Readout of Homo- vs Heterochiral Ligand Shell of Quantum Dots

Chwojnowska,

Kowalska,

Kamińska

et al. 2024

ACS Appl. Mater. Interfaces

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The chiroptical activity of various semiconductor inorganic nanocrystalline materials has typically been tested using circular dichroism or circularly polarized luminescence. Herein, we report on a high-throughput screening method for identifying and differentiating chiroptically active quantum-sized ZnO crystals using Raman spectroscopy combined with principal component analysis. ZnO quantum dots (QDs) coated by structurally diverse homo-and heterochiral aminoalcoholate ligands (cis-and trans-1amino-2-indanolate, 2-amino-1-phenylethanolate, and diphenyl-2-pyrrolidinemethanolate) were prepared using the one-pot self-supporting organometallic procedure and then extensively studied toward the identification of specific Raman fingerprints and spectral variations. The direct comparison between the spectra demonstrates that it is very difficult to make definite recognition and identification between QDs coated with enantiomers based only on the differences in the respective Raman bands' position shifts and their intensities. However, the applied approach involving the principal component analysis performed on the Raman spectra allows the simultaneous differentiation and identification of the studied QDs. The first and second principal components explain 98, 97, 97, and 87% of the variability among the studied families of QDs and demonstrate the possibility of using the presented method as a qualitative assay. Thus, the reported multivariate approach paves the way for simultaneous differentiation and identification of chirotopically active semiconductor nanocrystals.

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