Investigation of the nucleation and growth dynamics of FePt nanoparticles prepared via a high-temperature synthesis route employing PtCl2 as platinum precursor

Heller, Hauke; Ahrenstorf, Kirsten; Broekaert, J. A. C.; Weller, Horst

doi:10.1039/b822306h

Cited by 6 publications

(7 citation statements)

References 25 publications

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“…1 for the NiPt-CNT system after 1 and 10 minutes of reaction. As reported for the particle synthesis in homogeneous solution the particle formation is fast and the reaction is usually finished within a few minutes after the injection of the platinum precursor [20,32,[38][39][40]. Accordingly, we find a large amount of small particles either freely in solution or covering the CNTs already after 1 minute of synthesis.…”

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confidence: 75%

“…Representative TEM images are shown in Figure for the NiPt−CNT system after 1 and 10 min of reaction. As reported for the particle synthesis in homogeneous solution, the particle formation is fast and the reaction is usually finished within a few minutes after the injection of the platinum precursor. ,,− Accordingly, we find a large amount of small particles either freely in solution or covering the CNTs already after 1 min of synthesis. In the next minutes, the particles grow both in solution and on the CNTs, which are homogeneously and densely covered with NPs after 10 min (Figure b).…”

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confidence: 74%

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Reversible Attachment of Platinum Alloy Nanoparticles to Nonfunctionalized Carbon Nanotubes

et al. 2010

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The formation of monodisperse, tunable sized, alloyed nanoparticles of Ni, Co, or Fe with Pt and pure Pt nanoparticles attached to carbon nanotubes has been investigated. Following homogeneous nucleation, nanoparticles attach directly to non-functionalized singlewall and multiwall carbon nanotubes during nanoparticle synthesis as a function of ligand nature and the nanoparticle work function. These ligands do not only provide a way to tune the chemical composition, size and shape of the nanoparticles but also control a strong reversible interaction with carbon nanotubes and permit controlling the nanoparticle coverage. Raman spectroscopy reveals that the sp2 hybridization of the carbon lattice is not modified by the attachment. In order to better understand the interaction between the directly attached nanoparticles and the non-functionalized carbon nanotubes we employed first-principles calculations on model systems of small Pt clusters and both zig-zag and armchair singlewall carbon nanotubes. The detailed comprehension of such systems is of major importance since they find applications in catalysis and energy storage.Composites of metallic nanoparticles (NPs) and carbon nanotubes (CNTs) exhibit high catalytic activity for various chemical reactions [1][2][3][4][5][6] and have also been explored for hydrogen storage applications [7]. Recent reports include platinum [6,8,9] [19,20] and catalytic properties [21][22][23]. Beyond that, 1D alignment of NPs enables to modify the saturation magnetization and coercitivity through magnetostatic coupling [24][25][26]. A convenient way for 1D alignment is the attachment of NPs to CNTs, which is usually achieved by electrochemical deposition [27,28], the reduction of metallic salts in the presence of functionalized CNTs [15,29], or chemical vapor deposition [10], among others [30]. On the other hand, concerning the NP synthesis, the organometallic synthesis route provides nanocrystalline alloyed materials with precise size control and tunable composition in several systems [20,31,32]. Here, we report on the synthesis of alloyed N i x P t 1−x [20], Co x P t 1−x and F e x P t 1−x [32] NPs as well as pure P t [33] NPs and their attachment to non-functionalized singlewall (SWCNTs), multiwall carbon nanotubes (MWCNTs) and glassy carbon by their simple integration in the organometallic synthesis. The experimental procedure involves only a single synthetic step, whereby the crucial parameter for attachment was found in the correct balance of the ligands oleylamine (OA) and oleic acid (Oac).

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confidence: 75%

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confidence: 74%

Reversible Attachment of Platinum Alloy Nanoparticles to Nonfunctionalized Carbon Nanotubes

et al. 2010

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“…图 8 两种金属纳米粒子共消化熟化制备合金纳米粒子的结构示意图 Figure 8 Schematic illustration for alloy nanostructures by codigestive ripening of two metal nanoparticles 纳米合金与结构规整的金属间化合物的制备相对简单, 其共消化熟化的结果受热力学控制. 通过金属与配体的配合物的扩散, 实现不同颗粒之间的金属原子交换 [30] , 这种方法制备的纳米合金如 Au-Pd [96,97] 、 Au-Ag [19,98] 、Cu-Mg [99] 、Cu-Pd [100] 、Cu-Zn [101] 和磁性 FePt 纳米粒子等 [102,103] , 金属间化合物包括 Au-Cu [104,105] 、 Au-Sn [106] 、AgIn 3 和 AuIn 2 [107] 等.…”

Section: 金属纳米粒子的合金化unclassified

Digestive Ripening at Nanoscale and Its Application in the Preparation of Monodisperse Nanomaterials

Li¹,

Gao²,

Zhang³

et al. 2019

Acta Chim. Sinica

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Recently, a digestive ripening process at nanoscale has been widely used to prepare monodisperse nanoparticles (NPs), especially for sub-10 nm small NPs, with significant advantages such as the very narrow size distribution of the obtained nanoparticles, the versatile applications for various nanoparticles and the simple operation process. However, no Chinese references are reported on digestive ripening process till now, which may limit the cognition and utility of digestive ripening method for some domestic scientists. Thus, this review starts from the discovery of the phenomenon and the proposal of mechanism for digestive ripening at nanoscale, to the analysis of influence factors including the precursor in the precipitation reaction, the digestive ripening reagent, heating treatment temperature and processing time, solvent media and so on. Then, theoretical hypothesis and the derived results are introduced based on the charged surface, the curvature effect, the interaction between NP surface and attached ligand layer, the diffusion effect and the competing reaction balance in the digestive ripening process. Subsequently, the important applications of digestive ripening method in the preparation of monodisperse nanomaterials of metal NPs, alloy NPs, quantum dots of metal oxide and metal chalcogenide, and other NPs are discussed, the obtained small metal or alloy NPs show a perfect sphere shape and a very narrow size distribution (relative standard deviation less than ±5%). Finally, the broad perspectives are proposed in the NP assembly for optical, electric and magnetic nanodevices, and the heterogeneous catalysis of monodisperse metal, alloy and semiconducotr NPs via the digestive ripening method.

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“…Heller et al reported the formation of Fe 19 Pt 81 using equimolar concentrations of Fe(acac) 3 and PtCl 2 by a hot injection method. 38 In our synthesis method, The formation of Fe-depleted FePt NPs formation can be explained as follows: The reduction potential of Pt 2+ is 1.18 V (Pt 2+ + 2e − → Pt). 7 This positive reduction potential makes it easy to reduce Pt 2+ to Pt 0 .…”

Section: Elemental Analysismentioning

confidence: 99%

“…The SEM-EDX spectra of the respective NPs are given in Fig.S4 (ESI †). Heller et al reported the formation of Fe 19 Pt 81 using equimolar concentrations of Fe(acac) 3 and PtCl 2 by a hot injection method 38. In our synthesis method, Fe 32 Pt 68 , Fe 25 Pt 75 and Fe 19 Pt 81 were formed when PtCl 2 , PtCl 4 and H 2 PtCl 6 •6H 2 O, respectively were used as Pt-precursors.…”

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confidence: 91%

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

2014

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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, PtCl4 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 Fe19Pt81 with an average size of 6.2 nm shows the highest catalytic response.

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Investigation of the nucleation and growth dynamics of FePt nanoparticles prepared via a high-temperature synthesis route employing PtCl2 as platinum precursor

Cited by 6 publications

References 25 publications

Reversible Attachment of Platinum Alloy Nanoparticles to Nonfunctionalized Carbon Nanotubes

Reversible Attachment of Platinum Alloy Nanoparticles to Nonfunctionalized Carbon Nanotubes

Digestive Ripening at Nanoscale and Its Application in the Preparation of Monodisperse Nanomaterials

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

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