Size dependence of the lattice parameters of carbon supported platinum nanoparticles: X-ray diffraction analysis and theoretical considerations

Leontyev, Igor N.; Kuriganova, Alexandra B.; Leontyev, N. G.; Hennet, Louis; Rakhmatullin, Aydar; Smirnova, N. V.; Dmitriev, Vladimir

doi:10.1039/c4ra04809a

Cited by 92 publications

(69 citation statements)

References 76 publications

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“…The broadened and low diffraction peak at Pt (111) as well as little shift to the smaller angle (from 40°) suggests the formation of a large number of vacancies associated with higher population of low-coordination sites in smaller Pt clusters [32]. The shifting of diffraction peak to the smaller angle also suggests the expansion of the lattice parameter (interatomic distances) from the perfect single crystal lattice (for bulk Pt a 0 = 0.39231 nm) and also increase in the unit cell volume [44]. Lattice expansion with crystal size reduction has also been observed for Pd nanoparticles [45] and Ag nanoparticles [46].…”

Section: Structural Characterizationmentioning

confidence: 90%

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

et al. 2015

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Recently, small (\2 nm) and monodispersed Pt clusters has gained much attention due to their high catalytic activity in the aerobic oxidations. However, the chemical synthesis of small Pt clusters is not trivial; high temperature is often required to completely reduce the Pt 4?/2? ions to Pt 0 , which accelerates the growth of the Pt clusters. Here, we discussed a very simple microfluidic reduction of Pt 4? to Pt 0 by NaBH 4 in the presence of PVP that produces \2 nm Pt clusters in any variable reduction conditions. The microfluidic reduction conditions were optimized for the synthesis of possible smallest Pt clusters in terms of five reaction parameters: (1) temperature, (2) concentration of H 2 PtCl 6 , (3) molar ratio of NaBH 4 to Pt 4? ions, (4) molar ratio of PVP-monomer to Pt 4? ions, and (5) molecular weight/chain length of PVP. We found that possible smallest particles with average diameter 1.3 ± 0.3 nm were produced when aqueous solutions of H 2 PtCl 6 (4 mM) and NaBH 4 (40 mM) containing PVP (160 mM) were injected into the micromixer placed in an icebath at a flow rate of 200 mL/h. The produced particles were characterized by UV-visible absorption spectrophotometry, powder X-ray diffractometry and transmission electron microscopy.

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Section: Structural Characterizationmentioning

confidence: 90%

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

et al. 2015

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“…In Figure 5, the result of the measurement of the lattice parameters for the C supported Pt (Pt/C) nanoparticles as reported by Leontyev, et al [45] is presented. The smallest error is achieved when the fitting equation is (a 0 = 3.9173 -0.1170/D 2 Å,  = 0.0040).…”

Section: Confirmation With Experimental Datamentioning

confidence: 99%

“…Pt (220) [15] 3,9260 0,0473 Pt (422) [15] 3,9170 0,0568 Au (220) [15] 4,0717 0,0714 Au (422) [15] 4,0682 0,0673 Pt/C [45] 3,9173 0,1170 CeO 2 (micelle template) [46] 5,4168 0,1066 CeO 2 (simple precipitated) [46] 5,4085 0,2284…”

Section: Confirmation With Experimental Datamentioning

confidence: 99%

“…In their report, Leontyev,et al in [45] also mentioned that the lattice constant depends on the inverse of the diameter. Hence, we determine the fitting curve that varies with the inverse of the diameter as proposed by Leontyev, et al [45] and obtained (a 0 = 3.9247 -0.06866/D Å,  = 0.0212) as the fitting equation with the smallest error. It can be seen that the result of fitting a function that varies with the inverse of the square diameter as given by Eq.…”

Section: Confirmation With Experimental Datamentioning

confidence: 99%

“…concerning platinum (Pt) [15,45], gold (Au) [15], ceria (CeO 2 ) [46], tantalum (Ta) [47], and titania (TiO 2 ) [48]. Using scanning high-energy electron diffraction, Soliard and Flüeli in [15] observed that small particles of Au and Pt (size 39-500 Å) experienced a lattice constant reduction when the particle size decreased.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thickness Effect on Fluctuation of Electron States in Thin Film and Implications for Lattice Constant Change Due to Size Reduction

Amalia

Viridi

Abdullah

2017

J. Math. Fund. Sci.

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Abstract. We propose a model for predicting the fluctuation of electron states in thin films as a function of film thickness. The model is derived based on the assumption of the existence of potential barrier fluctuation on the film surface. Since the wave functions of electrons in the film are determined by the boundary conditions of the potential on the film surface, the potential fluctuation on the film surface implies fluctuation of the electron states in the film. The model was extended to predict the effect of size on the lattice constant of thin films or nanoparticles.

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Low‐Temperature Plasma Processing of Platinum Porphyrins for the Development of Metal Nanostructured Layers

Filippin

Sánchez‐Valencia

Idígoras

et al. 2017

Adv Materials Inter

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This article stablishes the bases for a vacuum and plasma supported methodology for the fabrication at mild temperatures of nanostructured platinum in the form of porous layers and nanocolumns using platinum octaethylporphyrin (PtOEP) as precursor. In addition, the application of these materials as tunable optical filters and nano-counterelectrodes is proved.On one hand, the transparency in the ultraviolet-visible-near infrared (UV-Vis-NIR) range can be adjusted precisely between 70% and 1% by tuning the deposition and processing conditions, obtaining a high spectral planarity. Deviations of the spectra from an ideal flat filter are below 4%, paving the way to the fabrication of neutral density filters. The

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Size dependence of the lattice parameters of carbon supported platinum nanoparticles: X-ray diffraction analysis and theoretical considerations

Abstract: The size effect of Pt/C nanoparticles with diameters ranging from 2 to 28 nm have been studied using X-ray diffraction.

Cited by 92 publications

References 76 publications

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

Thickness Effect on Fluctuation of Electron States in Thin Film and Implications for Lattice Constant Change Due to Size Reduction

Low‐Temperature Plasma Processing of Platinum Porphyrins for the Development of Metal Nanostructured Layers

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