TY - GEN
T1 - Photoluminescence transformation of core/shell CdSe/ZnS quantum dots at the conjugation to biomolecules
AU - Torchynska, T. V.
AU - Ballardo Rodríguez, I. Ch
AU - Shcherbyna, Ye
PY - 2011
Y1 - 2011
N2 - The paper presents the results of PL spectrum analysis of CdSe/ZnS QDs covered by PEG polymer with and without bioconjugation to bio-molecules - the Osteopontin antibodies. Commercial CdSe/ZnS QDs used in the study are characterized by the color emission with the maximum at 640 nm (1.96 eV) at 300K. It is shown that PL spectra of nonconjugated QDs can be presented as a superposition of PL bands related to exciton emission in the CdSe core (1.96 eV) and some high energy PL bands (in the spectral range 2.37-3.00 eV). The comparative study of PL spectrum at high (300K) and low (10K) temperatures has testified that high energy PL bands deal with electron-hole emission via interface states at the CdSe/ZnS/polymer interfaces. It is revealed that the QD bioconjugation to the anti Osteopontin antibody is accompanied by the change dramatically in PL spectra. Main features of PL spectrum transformstions deal with decreasing the PL intensity of interface related PL bands and the rise of intensity of CdSe core related PL bands. The explanation of mentioned effects has been proposed on the base of re-charging of interface related states at the bioconjugation process.
AB - The paper presents the results of PL spectrum analysis of CdSe/ZnS QDs covered by PEG polymer with and without bioconjugation to bio-molecules - the Osteopontin antibodies. Commercial CdSe/ZnS QDs used in the study are characterized by the color emission with the maximum at 640 nm (1.96 eV) at 300K. It is shown that PL spectra of nonconjugated QDs can be presented as a superposition of PL bands related to exciton emission in the CdSe core (1.96 eV) and some high energy PL bands (in the spectral range 2.37-3.00 eV). The comparative study of PL spectrum at high (300K) and low (10K) temperatures has testified that high energy PL bands deal with electron-hole emission via interface states at the CdSe/ZnS/polymer interfaces. It is revealed that the QD bioconjugation to the anti Osteopontin antibody is accompanied by the change dramatically in PL spectra. Main features of PL spectrum transformstions deal with decreasing the PL intensity of interface related PL bands and the rise of intensity of CdSe core related PL bands. The explanation of mentioned effects has been proposed on the base of re-charging of interface related states at the bioconjugation process.
UR - http://www.scopus.com/inward/record.url?scp=84879239690&partnerID=8YFLogxK
U2 - 10.1557/opl.2012.281
DO - 10.1557/opl.2012.281
M3 - Contribución a la conferencia
AN - SCOPUS:84879239690
SN - 9781627482028
T3 - Materials Research Society Symposium Proceedings
SP - 53
EP - 59
BT - Biomaterials for Medical Applications
T2 - 20th International Materials Research Congress, IMRC 2011
Y2 - 14 August 2011 through 19 August 2011
ER -