In this work we explore the preparation of complex-shaped semiconductor nanostructures composed of different materials via a cationic exchange process in which the cations of the original semiconductor nanostructure are replaced by cations of different metals with preservation of the shape and the anionic framework of the nanocrystals. Utilizing this cation exchange method, we synthesized two n...

This letter describes a simple synthetic approach to fabricate two-dimensional midinfrared CdSe photonic crystals ~PC! by electrodeposition of CdSe in a polymer template defined using interference lithography. Characterization of the transmission spectra of CdSe PCs with a hexagonal array of 1.3 mm diameter and 2.7 mm pitch air voids showed a well-defined drop in transmission at 4.23 mm. The dr...

CdSe quantum dots functionalized with oligo-(phenylene vinylene) (OPV) ligands (CdSe-OPV nanostructures) represent a new class of composite nanomaterials with significantly modified photophysics relative to bulk blends or isolated components. Singlemolecule spectroscopy on these species have revealed novel photophysics such as enhanced energy transfer, spectral stability, and strongly modified ...

We report a systematic investigation of the size dependence of negative trion (T(-)) Auger recombination rates in free-standing colloidal CdSe nanocrystals. Colloidal n-type CdSe nanocrystals of various radii have been prepared photochemically, and their trion decay dynamics have been measured using time-resolved photoluminescence spectroscopy. Trion Auger time constants spanning 3 orders of ma...

Coupling a single quantum emitter, such as a fluorescent molecule or a quantum dot (QD), to a plasmonic nanostructure is an important issue in nano-optics and nano-spectroscopy, relevant for a wide range of applications, including tip-enhanced near-field optical microscopy, plasmon enhanced molecular sensing and spectroscopy, and nanophotonic amplifiers or nanolasers, to mention only a few. Whi...

Graphdiyne (GDY) has attracted considerable attention as a new two-dimensional (2D) carbon hybrid material because of its good conductivity, adjustable electronic structure, and special electron transfer enhancement properties. GDY great potential in the field photocatalytic water splitting for hydrogen evolution, owing to unique In this study, was successfully prepared by mechanochemical coupl...

Two-dimensional II–VI semiconductor nanoplatelets (NPLs) present exceptionally narrow optical features due to their thickness defined at the atomic scale. Because drives band-edge energy, its control is of paramount importance. Here, we demonstrate that native carboxylate ligands can be replaced by halides partially dissolve cadmium chalcogenide NPLs edges. The released monomers then recrystall...

objective(s):  the field of nanotechnology is rapidly expanding .the development quantum dots quantum dot (qds), show great promise for treatment and diagnosis of cancer and targeted drug delivery little data on the toxicity of qds, especially for in vivo applications, are available. as a result, concerns exist over their toxicity for in vivo applications. then, cytotoxic effects of cadmium sel...

This study examines the dynamics of personality traits that interfere with occupational decisions among young adults, especially during a pandemic. Three multiple regression analyses were conducted to predict career decision self-efficacy (CDSE), e.g., planning and indecision from Big 5 measures. We hypothesized EI affect employment conflicts (Study 1), CDSE mediates difficulty 2). Conscientiou...

Stable water soluble surfactant coated CdSe nanocrystals with trioctylphosphine (TOP) were obtained by a process of dynamic surface coating with cationic, anionic, and non-ionic surfactants. The surfactant-coated CdSe/TOP nanocrystals were characterized by complementary techniques of UV-VIS and photo-luminescence spectrophotometry, as well as by means of a capillary zone electrophoretic techniq...