Monodisperse FePt 3 nanoparticles have been prepared using organic precursor of Fe (Fe(acac 3 )) and inorganic precursor of Pt (PtCl 2 ) by adopting hot injection methods using polyol process. By changing the concentration of precursors, reducing agent and surfactants, we examine different reaction products e.g. different phases of Fe-Pt and their magnetic behaviors. The use of excess surfactant and reducing agents was found to effect the nucleation and growth of the Fe-Pt nanoparticle formation. The Pt rich phases of Fe-Pt show very good electro-active response toward redox reaction of ferro-ferri couple electrolyte which was analyzed using cyclic-voltammetry. © 2015 AIP Publishing LLC.

N.K. Sahu

D. Bahadur

Sahu N.K

Bahadur D.

Catalytic

FePt 3

Nanoparticles

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Synthesis of FePt3 nanoparticles using PtCl2 and Fe(acac)3: Study of the surfactant effect, magnetism and electro-activity

AIP Conference Proceedings

We report the formation mechanism of FePt nanoparticles (NPs) by a high temperature polyol method using an equimolar ratio of Fe and Pt-precursor with different Pt-precursors. Pt(acac)2, PtCl2, PtCl 4 and H2PtCl6·H2O were used as Pt-precursors and Fe(acac)3 as the only Fe-precursor. Different stoichiometric compositions along with variation in size were obtained by using different precursors of Pt. Nearly, equiatomic FePt having a size ∼2 nm was formed with Pt(acac)2. However, Pt rich phases were formed using all other precursors with a size ranging between 3.6 to 6.4 nm. It was found that the atomic percentage (at%) of Fe in the FePt NPs depends on the reaction parameters. The decomposition behaviour of Fe and Pt-precursors were examined by vibrating sample magnetometer and thermogravimetric measurements. A possible reaction mechanism for Fe depleted FePt formation is proposed which suggests that the reduction potential and decomposition behaviour of the organic and inorganic salts of Pt significantly modify the nucleation behaviour. The electrocatalytic properties of all the four nanomaterials towards methanol oxidation have been investigated by cyclic voltammetry. It is found that Fe 19Pt81 with an average size of 6.2 nm shows the highest catalytic response. © 2014 The Royal Society of Chemistry.

Dalton Transactions

Role of different platinum precursors on the formation and reaction mechanism of FePt nanoparticles and their electrocatalytic performance towards methanol oxidation

We report a biphasic system (BPS) consisting of PEGylated Tb 3+-doped GdPO4 nanorice sensitized with Ce3+ (PEG-NRs) and glutamic acid coated iron oxide nanoparticles (IONPs) with multifunctional capabilities. The mesoporous PEG-NRs exhibit green light luminescence properties and a high degree of aqueous stability. Their drug loading and release capacities were investigated for anti-cancer chemo doxorubicin (DOX). Their mesoporous nature and availability of plenty of negatively charged functional groups (-COO-) on the surface of PEG-NRs facilitate approximately 94 wt% DOX loading. In vitro studies carried out for PEG-NRs and their biphasic integrated system with iron oxide using HeLa and MCF-7 cell lines demonstrated their cell killing efficacy. The green luminescence observed under confocal laser scanning microscopy (CLSM) confirms the cellular uptake of PEG-NRs by HeLa cell lines and their accumulation in the cytoplasm. Approximately 50-55% of HeLa and MCF-7 cell death was observed after 24 h of incubation with DOX loaded BPS (2 mg IONPs and 0.25 mg PEG-NRs + DOX), which further increased to about 90% when exposed to an AC magnetic field (ACMF) for 25 min. Our findings demonstrate that the therapeutic efficacy of BPS loaded with DOX could be a powerful multimodal system for imaging and synergistic chemo-thermal cancer therapy. This journal is © the Partner Organisations 2014.

Ce3+ sensitized GdPO4:Tb3+ with iron oxide nanoparticles: A potential biphasic system for cancer theranostics

Herein, we report magnetic properties of as-synthesized face centered cubic (fcc)-FePt nanoparticles (∼5 nm) and its transformed face centered tetragonal (fct) phase when annealed at 600°C. We observe weak ferromagnetic nature in fcc phase with non-saturating M-H loop indicating the presence of a large fraction of superparamagnetic particles. Excess of Fe-precursor with respect to Pt used in the reaction accumulates on the surface of the FePt nanoparticles and forms a thin layer of Fe-byproduct (Fe3O 4) which leads to the formation of FePt/Fe3O4 core/shell structure. This was confirmed by X-ray diffraction, X-ray photoelectron spectroscopy, and microstructural studies. Interestingly due to core/shell formation, the coercivity (Hc) is higher at 300 K than at 50 and 100 K, but there is a steep increase at 5 K. Moreover, hysteresis loop is regular at 300 K whereas it is distorted at 5 K. The reason for temperature dependent Hc anomaly and distortion in M-H loop was examined systematically. The competing exchange interaction seems to be responsible for changes in the magnetic behavior. Besides this, it shows spin glass like behavior much below the blocking temperature which is supposed to be due to existence of two magnetic phases and the exchange coupling between core and shell. This has been confirmed from temperature dependent dc magnetization and ac susceptibility studies. We establish a clear correlation between the magnetization dynamics and the core/shell structure of the nanoparticles. On the other hand, the fct phase shows a very large coercivity with some irregularity in the M-H loop. This irregularity may be ascribed due to segregation of fcc-Fe3Pt (soft) phase on the grain boundaries of fct-FePt (hard). Such inhomogeneity in bimagnetic systems (soft-soft or soft-hard) has strong influence on the nanomagnetism. © 2013 American Institute of Physics.

Journal of Applied Physics

Influence of excess Fe accumulation over the surface of FePt nanoparticles: Structural and magnetic properties

Journal of the American Chemical Society

FePt Nanoparticles as an Fe Reservoir for Controlled Fe Release and Tumor Inhibition

Journal of Power Sources

Aligned carbon nanotube–Pt composite fuel cell catalyst by template electrodeposition

Synthesis of FePt 3 nanoparticles using PtCl 2 and Fe(acac) 3 : Study of the surfactant effect, magnetism and electro-activity

Journal	Data powered by TypesetAIP Conference Proceedings
Publisher	Data powered by TypesetAmerican Institute of Physics Inc.
ISSN	0094243X
Open Access	No