TY - JOUR
T1 - Alloyed quaternary/binary core/shell quantum dot-graphene oxide nanocomposite
T2 - Preparation, characterization and application as a fluorescence “switch ON” probe for environmental pollutants
AU - Adegoke, Oluwasesan
AU - Montaseri, Hanieh
AU - Nsibande, Sifiso A.
AU - Forbes, Patricia B. C.
N1 - A postdoctoral fellowship offered by the University of Pretoria is gratefully appreciated by O. Adegoke. This work is based on research supported in part by the National Research Foundation of South Africa, Grant Numbers: 90720 and 93394 (P. Forbes), as well as the Department of Science and Technology (DST) through the Photonics Initiative of South Africa (PISA Grant PISA-15-DIR-06), and the Water Research Commission (WRC Grant K5/2438/1).
PY - 2017/10/5
Y1 - 2017/10/5
N2 - Alloyed l-cysteine-capped CdSeTeS/ZnS quantum dots (QDs) have been covalently linked to graphene oxide (GO) to form a new QD-GO nanocomposite material. Transmission electron microscopy, scanning electron microscopy, Raman, energy dispersive X-ray spectroscopy, X-ray diffraction, FT-IR, UV/vis and fluorescence spectrophotometry were used to characterize the nanocomposite material. Covalent binding of GO to the QDs quenched the fluorescence (“switch OFF”) of the QDs. The planar structure of GO and its π electron rich surface enables the adsorption of π rich aromatic analytes. Environmental pollutants, belonging to the class of polycyclic aromatic hydrocarbons (PAHs) were used as model analytes to test their affinity to adsorb onto GO via π- π interaction and trigger fluorescence transduction changes (“switch ON”) in the conjugated QDs. Our investigation showed that the affinity of the four PAH analytes tested to switch on the fluorescence of the nanocomposite probe followed the order phenanthrene > anthracene > naphthalene > pyrene.
AB - Alloyed l-cysteine-capped CdSeTeS/ZnS quantum dots (QDs) have been covalently linked to graphene oxide (GO) to form a new QD-GO nanocomposite material. Transmission electron microscopy, scanning electron microscopy, Raman, energy dispersive X-ray spectroscopy, X-ray diffraction, FT-IR, UV/vis and fluorescence spectrophotometry were used to characterize the nanocomposite material. Covalent binding of GO to the QDs quenched the fluorescence (“switch OFF”) of the QDs. The planar structure of GO and its π electron rich surface enables the adsorption of π rich aromatic analytes. Environmental pollutants, belonging to the class of polycyclic aromatic hydrocarbons (PAHs) were used as model analytes to test their affinity to adsorb onto GO via π- π interaction and trigger fluorescence transduction changes (“switch ON”) in the conjugated QDs. Our investigation showed that the affinity of the four PAH analytes tested to switch on the fluorescence of the nanocomposite probe followed the order phenanthrene > anthracene > naphthalene > pyrene.
KW - Graphene oxide
KW - Quantum dots
KW - Polycyclic aromatic hydrocarbon
KW - Photoluminescence Fluorescence probe
U2 - 10.1016/j.jallcom.2017.05.242
DO - 10.1016/j.jallcom.2017.05.242
M3 - Article
SN - 0925-8388
VL - 720
SP - 70
EP - 78
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -