Evaporation of Gold on NaCl Surfaces as a Way to Control Spatial Distribution of Nanoparticles: Insights on the Shape and Crystallographic Orientation
Por:
Mendoza-Cruz R., Romeu D., Bazán-Díaz L., Samaniego J.E., Santiago U., Ponce A., José-Yacamán M.
Publicada:
1 nov 2017
Resumen:
Herein, the growth of Au nanoparticles on NaCl surfaces as a way to control their spatial distribution is explored, giving new insights into the shape and relative orientation of the resulting nanoparticles through modern electron microscopy techniques. Their morphological features depending on the geometry of the NaCl surface site they nucleated on are described in detail. Also, hitherto unreported small but systematic angular deviations in the range of 1-4° from the exact epitaxial orientation were observed. A theoretical approach based on straightforward elastic energy considerations and yet capable of accounting for the experimental results was developed. The production of metallic nanoparticles is a fundamental subject in the development of nanotechnology, and the fine control of the shape and spatial distribution is an important issue for the applicability of nanoparticles. Furthermore, in spite of the extensive research on this topic, some key features such as the precise mechanism controlling particle shape and particle-substrate orientation are still not well understood as evidenced by the results of this work. Thus, a clear understanding of the role played by the diverse factors involved in epitaxial growth is required to produce nanoparticles with finely tailored properties. © 2017 American Chemical Society.
Filiaciones:
Mendoza-Cruz R.:
Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
Romeu D.:
Departamento de Materia Condensada, Instituto de Física, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito de la Investigación Científica s/n, Coyoacán, Ciudad de México, 04510, Mexico
Bazán-Díaz L.:
Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
Samaniego J.E.:
Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
Centro de Investigación y de Estudios Avanzados Del Instituto Politécnico Nacional, Libramiento Norponiente 2000, Real de Juriquilla, Querétaro, 76230, Mexico
Santiago U.:
Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
Ponce A.:
Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
José-Yacamán M.:
Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
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