TY - JOUR
T1 - The mechanism of the photoluminescence changes in bio-conjugated CdSe/ZnS quantum dots
AU - Borkovska, L.
AU - Korsunska, N.
AU - Stara, T.
AU - Kolomys, O.
AU - Strelchuk, V.
AU - Rachkov, O.
AU - Kryshtab, T.
N1 - Funding Information:
This work was partially supported by the National Academy of Sciences of Ukraine through the program “Nanotechnologies and Nanomaterials” (grant no. 2.2.1.14/26 ) and the project “ Physical and Physical-Technological Aspects of Fabrication and Characterization of Semiconductor Materials and Functional Structures for Modern Electronics ” (grant no. III-41-12 ).
PY - 2013/9/15
Y1 - 2013/9/15
N2 - The change of the photoluminescence (PL) and optical characteristics in non-conjugated and conjugated with S6K2 antibody CdSe/ZnS core/shell quantum dots (QDs) during storage in air has been studied by the conventional PL, micro-PL and micro-Raman techniques. The QDs dried on a crystalline Si substrate were kept in the darkness and under illumination. In the PL spectra, the storage resulted in a blue shift of PL peak position, in the increasing of the full width at a half maximum (FWHM) of the PL band and in the decreasing of the PL intensity. In the Raman spectra, the shift of the CdSe LO peak position to the low frequency region and the increasing of its FWHM were observed. The transformations in the PL and optical characteristics correlate with each other and are found to be the largest in bio-conjugated QDs stored under illumination. The increase of the light intensity accelerated the changes occurred during storage. An oxidation of the QD core, which decreases the QD size, is supposed to be responsible for observed transformations. The bio-conjugation is assumed to promote QD oxidation that results in different PL peak position in stored non-conjugated and bio-conjugated QDs. The mechanism of the effect is discussed.
AB - The change of the photoluminescence (PL) and optical characteristics in non-conjugated and conjugated with S6K2 antibody CdSe/ZnS core/shell quantum dots (QDs) during storage in air has been studied by the conventional PL, micro-PL and micro-Raman techniques. The QDs dried on a crystalline Si substrate were kept in the darkness and under illumination. In the PL spectra, the storage resulted in a blue shift of PL peak position, in the increasing of the full width at a half maximum (FWHM) of the PL band and in the decreasing of the PL intensity. In the Raman spectra, the shift of the CdSe LO peak position to the low frequency region and the increasing of its FWHM were observed. The transformations in the PL and optical characteristics correlate with each other and are found to be the largest in bio-conjugated QDs stored under illumination. The increase of the light intensity accelerated the changes occurred during storage. An oxidation of the QD core, which decreases the QD size, is supposed to be responsible for observed transformations. The bio-conjugation is assumed to promote QD oxidation that results in different PL peak position in stored non-conjugated and bio-conjugated QDs. The mechanism of the effect is discussed.
KW - Bio-conjugation
KW - Quantum dots
KW - micro-Photoluminescence
KW - micro-Raman
UR - http://www.scopus.com/inward/record.url?scp=84880326652&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2012.12.145
DO - 10.1016/j.apsusc.2012.12.145
M3 - Artículo
AN - SCOPUS:84880326652
SN - 0169-4332
VL - 281
SP - 79
EP - 83
JO - Applied Surface Science
JF - Applied Surface Science
ER -