Fabrication and characterization of CdSe/ZnS quantum dots-doped polystyrene microspheres prepared by self-assembly

Abstract

Abstract

Encapsulated Cd3P2 quantum dots emitting from the visible to the near infrared for bio-labelling applications

“…The PL peak of PS@Cd 3 P 2 is found to have shifted a little bit to a longer wavelength, and to be broader than the Cd 3 P 2 QD core, which suggests that the NIR emission mainly comes from the Cd 3 P 2 and the observed broadening phenomenon can be explained by the conjugative effect between the QDs and PS polymer. 21 Although the sample of SiO 2 @Cd 3 P 2 exhibits a weaker PL peak, the PL peak at the NIR region is still observable, which demonstrates the successful encapsulation of the QDs in SiO 2 .…”

“…17,18 For example, polystyrene (PS) micro-spheres have been investigated due to their potential application within the biomedical field. 19 Up to now, PS microspheres have been used to encapsulate CdSe, 20 CdSe/ZnS, 21 Au nanoparticles, 22 and others. 23 The preparative procedures include microemulsion polymerization, 24 emulsifier-free polymerization, 25 seed emulsion polymerization 26 and dispersion polymerization.…”

One-step self-assembling multiple hydrophobic quantum dots and hydrophilic biomolecules into all-inclusive tags for ultrasensitive immunosensors

“…[4][5] Nevertheless, such surface modification will diminish the quantum yields of the as-prepared QDs. [6] Another strategy is to form hydrophilic micelle-like QDs by encapsulating them into nanocarriers, such as hydrophilic polymers, [7][8][9][10] liposomes, [11][12][13] or inorganic hollow spheres (polystyrene spheres, [14][15] or silica spheres [16][17][18][19][20]). Though significant enhancement of fluorescence can be obtained, it usually requires multistep process, including carrier formation, QDs-loading, core template removal and the subsequent bioconjugation.…”

“…Under the optimal experimental conditions, a quantitative and qualitative MICA toward sildenafil and tadalafil were established (See Supplementary Material for details). The gray value (G) of the test lines decreased with the analyte concentration increased (the minimal inset of Figure5aand Figure5b), and two nonlinear curves were fitted as follows: GSildenafil = (87.12-55.56) / [1 + (X / 0.15)1.98 ] + 55.56; GTadalafil = (89.02-55 1515…”

Metal oxide QD based ultrasensitive microsphere fluorescent sensor for copper, chromium and iron ions in water

“…34 Very recently, microspheres and nanospheres are increasingly being utilized as QDs-sensor platforms. 35 Microspheres not only improve the stability of QDs but also offer multicolour signals and can mask the toxicity of QDs effectively. We incorporated QDs into the microspheres which make the QDs as the most promising candidate by preventing it aggregation, guarantying good chemical properties and maintain photostability.…”