EPR study of manganese in Cd1-xMnxS quantum dots
Abstract
Cd1-xMnxS quantum dots (QDs) with a diameter d less than or equal to 4.5 nm and manganese concentration from x 0.001 to x 0.15 have been prepared using aqueous Solution precipitation. The EPR measurements have been performed on a 9.5 GHz spectrometer in the temperature range 20-290 K. Two structures are observed in the EPR spectra for all manganese concentrations, a hyperfine structure and a broad EPR line. The hyperfine structure is described by allowed and forbidden hyperfine transitions of the Mn2+ ion central sextet with the hyperfine splitting constant \A\ 9.6 mT and axial-field splitting parameter D ranging from 11.1 to 13.5 mT. The hyperfine structure is attributed to the isolated Mn2+ ions at or near the surface of nanocrystals. The width of the broad resonance and its temperature independence suggest that the wide line originates from noncentral manganese transitions broadened by crystal field effects, as in some disordered materials.
Keywords:
Cd1-xMnxS / EPR / quantum dots (QDs)Source:
Materials Science Forum, 2004, 453-454, 263-268Note:
- Progress in Advanced Materials and Processes, 5th Conference of the Yugoslav-Materials-Research-Society (Yu-MRS 2003), Sep 15-19, 2003, Herceg Novi, Yugoslavia
DOI: 10.4028/www.scientific.net/MSF.453-454.263
ISSN: 0255-5476
WoS: 000221535700045
[ Google Scholar ]Institution/Community
VinčaTY - JOUR AU - Babić-Stojić, Branka S. AU - Milivojević, Dušan AU - Čomor, Mirjana AU - Vodnik, Vesna PY - 2004 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6426 AB - Cd1-xMnxS quantum dots (QDs) with a diameter d less than or equal to 4.5 nm and manganese concentration from x 0.001 to x 0.15 have been prepared using aqueous Solution precipitation. The EPR measurements have been performed on a 9.5 GHz spectrometer in the temperature range 20-290 K. Two structures are observed in the EPR spectra for all manganese concentrations, a hyperfine structure and a broad EPR line. The hyperfine structure is described by allowed and forbidden hyperfine transitions of the Mn2+ ion central sextet with the hyperfine splitting constant \A\ 9.6 mT and axial-field splitting parameter D ranging from 11.1 to 13.5 mT. The hyperfine structure is attributed to the isolated Mn2+ ions at or near the surface of nanocrystals. The width of the broad resonance and its temperature independence suggest that the wide line originates from noncentral manganese transitions broadened by crystal field effects, as in some disordered materials. T2 - Materials Science Forum T1 - EPR study of manganese in Cd1-xMnxS quantum dots VL - 453-454 SP - 263 EP - 268 DO - 10.4028/www.scientific.net/MSF.453-454.263 ER -
@article{ author = "Babić-Stojić, Branka S. and Milivojević, Dušan and Čomor, Mirjana and Vodnik, Vesna", year = "2004", abstract = "Cd1-xMnxS quantum dots (QDs) with a diameter d less than or equal to 4.5 nm and manganese concentration from x 0.001 to x 0.15 have been prepared using aqueous Solution precipitation. The EPR measurements have been performed on a 9.5 GHz spectrometer in the temperature range 20-290 K. Two structures are observed in the EPR spectra for all manganese concentrations, a hyperfine structure and a broad EPR line. The hyperfine structure is described by allowed and forbidden hyperfine transitions of the Mn2+ ion central sextet with the hyperfine splitting constant \A\ 9.6 mT and axial-field splitting parameter D ranging from 11.1 to 13.5 mT. The hyperfine structure is attributed to the isolated Mn2+ ions at or near the surface of nanocrystals. The width of the broad resonance and its temperature independence suggest that the wide line originates from noncentral manganese transitions broadened by crystal field effects, as in some disordered materials.", journal = "Materials Science Forum", title = "EPR study of manganese in Cd1-xMnxS quantum dots", volume = "453-454", pages = "263-268", doi = "10.4028/www.scientific.net/MSF.453-454.263" }
Babić-Stojić, B. S., Milivojević, D., Čomor, M.,& Vodnik, V.. (2004). EPR study of manganese in Cd1-xMnxS quantum dots. in Materials Science Forum, 453-454, 263-268. https://doi.org/10.4028/www.scientific.net/MSF.453-454.263
Babić-Stojić BS, Milivojević D, Čomor M, Vodnik V. EPR study of manganese in Cd1-xMnxS quantum dots. in Materials Science Forum. 2004;453-454:263-268. doi:10.4028/www.scientific.net/MSF.453-454.263 .
Babić-Stojić, Branka S., Milivojević, Dušan, Čomor, Mirjana, Vodnik, Vesna, "EPR study of manganese in Cd1-xMnxS quantum dots" in Materials Science Forum, 453-454 (2004):263-268, https://doi.org/10.4028/www.scientific.net/MSF.453-454.263 . .