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Palladium nanoparticles from solvated atoms—stability and HRTEM characterization

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Abstract

Palladium particles of nanometric dimensions were synthesized by the chemical liquid deposition method in which the Pd atoms were co-deposited at 77 K with 2-propanol, acetone, and tetrahydrofurane vapor to obtain colloidal dispersions. The colloidal dispersions were characterized by UV–visible spectrophotometry, transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). The palladium colloids synthesized by use of these solvents are very stable. A strong absorption band in the UV region suggests that quantum confinement occurs in the nanoparticles obtained by this procedure. Studies of TEM micrographs reveal average size distributions between 1 and 5 nm for all Pd colloids. Whereas particle sizes in Pd–2-propanol colloids are not very sensitive to concentration change, the particle-size average in Pd–acetone and Pd–THF increases by 0.5 nm when the concentration increases from 10−3 to 10−2 mol l−1. The HRTEM results show the high crystallinity of Pd nanoparticles and three low-energy structure shapes were found: cuboctahedron, tetrakaidecahedron, and icosahedron.

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Acknowledgment

This research was possible thanks to financial support from Fondecyt (Grant 2010108), CONICYT for the PhD Fellowship (R. Segura), and Mecesup UCO9905. The authors wish to thank Dirección de Investigación, Universidad de Concepción, particularly Mr Raúl Alarcón of the TEM laboratory. The authors also wish to thank Mrs Cristina Zorrilla, Mr Samuel Tehuacanero, Pedro Mexia, Roberto Hernandez, and Luis Rendón of the HRTEM and Image-Processing Laboratory of the Instituto de Física de la UNAM, México.

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Authors and Affiliations

  1. Laboratorio de Atomos Metálicos, Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 160-C, Concepción, Chile

    Galo Cárdenas-Triviño & Rodrigo A. Segura

  2. Laboratorio HRTEM, Departamento de Física de la Materia Condensada, Instituto de Física, Universidad Nacional Autónoma de México, DF, Mexico

    José Reyes-Gasga

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  1. Galo Cárdenas-Triviño
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  2. Rodrigo A. Segura
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  3. José Reyes-Gasga
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Correspondence to Galo Cárdenas-Triviño.

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Cárdenas-Triviño, G., Segura, R.A. & Reyes-Gasga, J. Palladium nanoparticles from solvated atoms—stability and HRTEM characterization. Colloid Polym Sci 282, 1206–1212 (2004). https://doi.org/10.1007/s00396-004-1060-0

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