Bulk synthesis of homogeneous and transparent bulk core/multishell quantum dots/PMMA nanocomposites with bright luminescence

Abstract

Core/multishell CdSe/CdS/CdS/Cd0.75Zn0.25S/Cd0.5Zn0.5S/Cd0.25 Zn0.75S/ZnS/ZnS QDs/PMMA bulk nanocomposites were successfully synthesized. To achieve a homogeneous and stable dispersion in MMA monomers, QDs were first modified with amphiphilic polymer of poly(ethylene glycol)‐oleate (PEG‐oleate). Subsequently, the transparent and homogeneous bulk composites were obtained by photopolymerization. The TEM analysis of ultramicrotome cut of composite demonstrates that QDs are well dispersed in the PMMA matrix. UV–vis transmission spectra show the nanocomposites still maintain high transmittance even with QDs content of up to 6 wt %. The thermogravimetric analysis (TGA) reveals the incorporation of the QDs significantly improves the thermal stability of composites, as evidenced by the retardation of a degradation initiation by 60°C. Photoluminescence spectra suggest that the nanocomposites exhibit bright fluorescence under UV excitation. X‐ray excited luminescence spectra show they have response to X‐ray. All of the experimental results indicate the great promising applications of core/multishell QDs/PMMA nanocomposites in optical communication devices and radiation detectors. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1548–1553, 2013

Core–shell nanoparticles: synthesis and applications in catalysis and electrocatalysis

“…The first synthesis of multilayered QDs was reported by Shi and co-workers, 201 subsequently followed by several synthetic strategies for preparing multishell QDs. 203 In their synthetic scheme, the authors reported modification of the QDs with the amphiphilic polymer poly(ethylene glycol)-oleate (PEG-oleate) in order to make a homogeneous dispersion. 202 A more complex CdSe/CdS/CdS/Cd 0.75 Zn 0.25 S/Cd 0.5 Zn 0.5 S/Cd 0.25 Zn 0.75 S/ZnS/ZnSQDs/ PMMA bulk nanocomposite has been synthesized using a combination of SILAR method (to prepare layered QDs) and photopolymerization (to synthesize the outer organic shell) using 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TPO) as the initiator (Fig.…”

A facile layer-by-layer assembly method for the fabrication of fluorescent polymer/quantum dot nanocomposite thin films

“…The thermal stability of PMMA-SH/CdSe@CdS QDs is better than that of the bare PMMA-SH lm aer 340 C. The improvement of the thermal stability of the PMMA-SH/CdSe@CdS QDs nanocomposite could be assigned to the interaction between the CdSe@CdS QDs and PMMA-SH polymer chains. 50 The further crosslinking in the PMMA-SH/CdSe@CdS QDs nanocomposite hindered the movement of the PMMA-SH chains and prevented its thermal decomposition. The superior thermal stability of the PMMA/ QDs nanocomposite is of great importance for applications in device manufacturing.…”

CdSe kuantum nokta katkılı polimer nanokompozitlerin radyolüminesans ve optik karakterizasyonu

“…be seen in Table 2, at low addition ratios (0.2% and 1%), nanocomposites show close thermal stability to LDPE. However, the sample with 5% CdSe addition showed faster degradation than the others [18,19]. The TEM image of CdSe QD revealed a distinct spherical shape pattern of the particle distribution and also showed that the particles were highly monodispersed and the CdSe QD measured was 2.8 nm.…”