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. 2015 Nov 9:5:16384.
doi: 10.1038/srep16384.

Synthesis of bi-phase dispersible core-shell FeAu@ZnO magneto-opto-fluorescent nanoparticles

Xue-Mei Li  1 , Hong-Ling Liu  1 , Xiao Liu  1 , Ning Fang  1 , Xian-Hong Wang  1 , Jun-Hua Wu  2   3   4
Affiliations

Synthesis of bi-phase dispersible core-shell FeAu@ZnO magneto-opto-fluorescent nanoparticles

Xue-Mei Li et al. Sci Rep. .

Abstract

Bi-phase dispersible core-shell FeAu@ZnO magneto-opto-fluorescent nanoparticles were synthesized by a modified nanoemulsion process using poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (PEO-PPO-PEO) as the surfactant. The morphology and crystal structure of the nanoparticles were studied by TEM/HRTEM and XRD. The nanoparticles manifest soft ferromagnetic and/or near superparamagnetic behavior with a small coercivity of ~19 Oe at room temperature. The corresponding magnetic hysteresis curves were elucidated by the modified Langevin equation. The FTIR study confirms the PEO-PPO-PEO molecules on the surface of the nanoparticles. The UV-vis and PL results reveal the well-behaved absorption bands including surface plasmon resonance and multiple visible fingerprint photoluminescent emissions of the nanoparticles dispersed in both hydrophilic and hydrophobic solvents. Moreover, the processes of solvent dispersion-collection of the nanoparticles were demonstrated for application readiness of such core-shell nanostructures.

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Figures

Figure 1
Figure 1. TEM analyses of the PEO-PPO-PEO-laced FeAu@ZnO core-shell nanoparticles.
(a) Bright-field image, (b) particle size histogram with Gaussian fit, (c) HRTEM of an individual FeAu@ZnO nanoparticle.
Figure 2
Figure 2. XRD patterns of the nanoparticles.
(a) FeAu@ZnO, (b) FeAu nanoparticles.
Figure 3
Figure 3
FTIR spectra of (a) the pure PEO-PPO-PEO polymer, and (b) the PEO-PPO-PEO-laced FeAu@ZnO nanoparticles.
Figure 4
Figure 4. Photoimages of solvent dispersion-collection process of the PEO-PPO-PEO-laced FeAu@ZnO nanoparticles.
Figure 5
Figure 5. Hysteresis curve of the PEO-PPO-PEO-laced FeAu@ZnO nanoparticles recorded at room temperature.
Figure 6
Figure 6. Analysis of the hysteresis curves of the PEO-PPO-PEO-laced FeAu@ZnO nanoparticles.
Experimental data in curves and the fitting results in dots.
Figure 7
Figure 7. UV-visible absorbance spectra of the PEO-PPO-PEO-laced FeAu@ZnO dispersed in different solvents.
Ethanol (a), hexane (b), and water (c), in comparison to FeAu (d), Au (e) and ZnO (f) nanoparticles (all in hexane).
Figure 8
Figure 8. Photoluminescence emission spectra of the PEO-PPO-PEO-laced FeAu@ZnO nanoparticles dispersed in different solvents.
Ethanol (a), hexane (b), and water (c), in comparison to ZnO nanoparticles dispersed in hexane (d).
See this image and copyright information in PMC

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