TY - JOUR
T1 - Emission variation in CdSe/ZnS quantum dots conjugated to papilloma virus antibodies
AU - Jaramillo Gómez, Juan A.
AU - Torchynska, Tetyana V.
AU - Casas Espinola, Jose L.
AU - Douda, Janna
PY - 2013
Y1 - 2013
N2 - The paper presents a comparative study of the photoluminescence (PL) and Raman scattering spectra of core-shell CdSe/ZnS quantum dots (QDs) in nonconjugated states and after the conjugation to the anti-human papilloma virus (HPV), HPV 16-E7, antibodies. All optical measurements are performed on the dried droplets of the original solution of nonconjugated and bioconjugated QDs located on the Si substrate. CdSe/ZnS QDs with emission at 655 nm have been used. PL spectra of nonconjugated QDs are characterized by one Gaussian shape PL band related to the exciton emission in the CdSe core. PL spectra of bioconjugated QDs have changed essentially: the core PL band shifts into the high energy spectral range ("blue" sift) and becomes asymmetric. A set of physical reasons has been proposed for the "blue" shift explanation of the core PL band in bioconjugated QDs. The variation of PL spectra versus excitation light intensities has been studied to analyses the exciton emission via excited states in QDs. Finally the PL spectrum transformation for the core emission in bioconjugated QDs has been attributed to the electronic quantum confined effects stimulated by the electric charges of bioconjugated antibodies.
AB - The paper presents a comparative study of the photoluminescence (PL) and Raman scattering spectra of core-shell CdSe/ZnS quantum dots (QDs) in nonconjugated states and after the conjugation to the anti-human papilloma virus (HPV), HPV 16-E7, antibodies. All optical measurements are performed on the dried droplets of the original solution of nonconjugated and bioconjugated QDs located on the Si substrate. CdSe/ZnS QDs with emission at 655 nm have been used. PL spectra of nonconjugated QDs are characterized by one Gaussian shape PL band related to the exciton emission in the CdSe core. PL spectra of bioconjugated QDs have changed essentially: the core PL band shifts into the high energy spectral range ("blue" sift) and becomes asymmetric. A set of physical reasons has been proposed for the "blue" shift explanation of the core PL band in bioconjugated QDs. The variation of PL spectra versus excitation light intensities has been studied to analyses the exciton emission via excited states in QDs. Finally the PL spectrum transformation for the core emission in bioconjugated QDs has been attributed to the electronic quantum confined effects stimulated by the electric charges of bioconjugated antibodies.
KW - CdSe/ZnS
KW - colloidal particles
KW - luminescence
UR - http://www.scopus.com/inward/record.url?scp=84899545050&partnerID=8YFLogxK
U2 - 10.1557/opl.2013.1176
DO - 10.1557/opl.2013.1176
M3 - Artículo de la conferencia
AN - SCOPUS:84899545050
SN - 0272-9172
VL - 1617
SP - 139
EP - 144
JO - Materials Research Society Symposium Proceedings
JF - Materials Research Society Symposium Proceedings
T2 - 22nd International Materials Research Congress, IMRC 2013
Y2 - 11 August 2013 through 15 August 2013
ER -