Characterization and photoluminescence studies of CdTe nanoparticles before and after transfer from liquid phase to polystyrene

Abstract

The major objective of this work was to detect the change of photoluminescence (PL) intensity of CdTe nanoparticles (NPs) before and after transfer from liquid phase to polystyrene (PS) matrix by electrospinning technique. Thio-stabilized CdTe NPs were first synthesized in aqueous, then enwrapped by cetyltrimethylammonium bromide (CTAB), and finally, transferred into PS matrix to form CdTe/PS nanofibres by electrospinning. Then, CdTe/PS nanofibres were characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM) to observe their morphology and distribution, respectively. The selective area electronic diffraction (SAED) pattern proved that the CdTe NPs were cubic lattice. The PL spectrum indicated that CdTe NPs have been transferred into PS nanofibres, and the PL intensity of CdTe NPs in the nanofibres was even higher than that before CdTe NPs were introduced into PS nanofibres. Moreover, X-ray photoelectron spectra (XPS) revealed that thiol-stabilized CdTe NPs were enwrapped by CTAB, and PS acted as a dispersant in the process of electrospinning.

Synergetic effect of functional cadmium–tellurium quantum dots conjugated with gambogic acid for HepG2 cell-labeling and proliferation inhibition

“…15 For biological and clinical applications, quantum dots (QDs) are widely studied for various purposes including labeling, imaging, targeted drug delivery, and photodynamic therapy. [16][17][18] Various types of QDs have been extensively explored and utilized in cell-or animal-based evaluations of toxicity and biocompatibility in vitro or in vivo, even at the molecular level. [19][20][21] Cadmium-tellurium (CdTe) QDs are typical semiconductor nanomaterials with good fluorescence characteristics; they have attracted considerable attention because of their unique optical properties and their potential applications in the manufacturing of chemical sensors, optical switches, display devices, and biological labels.…”

Characteristics of CdTe nanocrystals synthesized by a Na2TeO3source

“…The methods in Refs. [13][14][15][16][17][18][19] need strict anaerobic conditions, using NaHTe (synthesized by NaBH 4 and Te powder) as the tellurium source. This increases the complexity of the operation, due to the extreme instability of NaHTe in air.…”

Self-assembly of CdTe Nanowires for Solar Cells Under a 550 nm Wavelength Light

“…If the methanol precipitation and aqueous re-dissolution procedure is skipped and the initial excess of the thiol stabilizer remains in solution, NWs will not develop. As a result, they reported that the chain aggregation was caused by a drop of the stabilizer concentration, so that the dynamic equilibrium between the NP binding and the free stabilizer shifted to the dissolved state [6,27]. In the present study, we explore a new strategy for CdTe NW synthesis under a specific wavelength of light and describe the entire procedure involved.…”