Bifunctional Nanoparticles with Magnetization and Luminescence

Abstract

The Fe 3 O 4 @LaF 3 :Ce 3+ -Tb 3+ bifunctional composite nanoparticles were fabricated with a facile layer-bylayer technology. To get these bifunctional nanocomposites, the as-prepared magnetic (Fe 3 O 4 ) and luminescent (LaF 3 :Ce 3+ -Tb 3+ ) nanoparticles were modified with polyelectrolyte to get positively charged and negatively charged surfaces, respectively. The nanocomposites were then obtained by absorbing the negatively charged LaF 3 :Ce 3+ -Tb 3+ @(PAH/PSS) 2 luminescent nanoparticles onto the positively charged Fe 3 O 4 @(PAH/PSS) 2 / PAH magnetic nanocrystal surface through electrostatic interaction. The nanocomposites were characterized with transmission electron microscope (TEM), powder X-ray diffraction (XRD), superconducting quantum interference device (SQUID) magnetometer, Fourier transform infrared (FTIR), and fluorescence technologies. Results indicate that these nanocomposites possess both high magnetization and strong fluorescence, which allows them great potential for bioapplications such as magnetic bioseparation, magnetic resonance imaging (MRI), and drug/gene delivery, simultaneously coupled with fluorescence immunoassays/imaging.

Determination of Thiram and Aminocarb Pesticides in Natural Water Samples Using Flow Injection with Tris(2,2′-bipyridyl)-ruthenium(II)-diperiodatoargentate(III) Chemiluminescence Detection

“…11,31,32 DPA played a strong oxidizing role with luminol, and some drugs were capable of enhancing the CL reaction. 15 In the present study, the maximum CL in the presence and absence of thiram and aminocarb containing nitrogen appeared at a 610 nm, and a much higher CL peak was observed in the presence of thiram and aminocarb, indicating that Ru(II) is the luminophore. DPA is used as an oxidizing agent for generating Ru(bipy)3…”

“…[11][12][13] Yang and Zhang 14 have reported a flow-injection (FI)-CL method for the determination of uric acid in human serum based on the reaction of DPA with uric acid in an alkaline medium; it generates a strong CL signal with a detection limit (3σ) of 1.2 × 10 -7 mol L -1 . Yang et al 15 have reported an FI-CL method for amikacin sulfate in human serum based on its enhancement effect on a luminol-DPA CL system in an alkaline medium with a detection limit (3σ) of 1.9 × 10 -8 mol L -1 . Zhao et al 16 have reported another FI-CL method for gemifloxacin in pharmaceutical preparations and biological fluids based on a gemifloxacin-DPA CL reaction in a sulfuric acid medium sensitized by cetyltrimethylammonium bromide with a detection limit (3σ) of 7.3 × 10 -10 g mL -1 .…”

One-pot synthesis and strong near-infrared upconversion luminescence of poly(acrylic acid)-functionalized YF3:Yb3+/Er3+ nanocrystals

“…During the past decades, magnetic nanoparticles [1,2], noble metal nanocrystals [3], quantum dots (QDs) [4][5][6][7], and other kinds of luminescent nanomaterials [8][9][10] have been successfully prepared and widely used in the biological and medical fields. Due to their novel optical properties, QDs are preferable to organic dyes for biotagging applications.…”

Superparamagnetic iron oxide nanoparticles: magnetic nanoplatforms as drug carriers

“…These formulations not only serve the purpose of being drug delivery vectors but also have applications in MRI imaging, 95 targeted thermosensitive chemotherapy, 96 magnetically targeted photodynamic therapy, 97 and fluorescent/luminescence imaging. 98 Yallapu et al developed water-dispersible SPIONs for hyperthermia, MRI, and drug delivery applications. SPIONs were prepared by precipitation of iron salts in the presence of ammonia and coated with β-cyclodextrin and a Pluronics polymer.…”