Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures

Au-Ag alloy nanostructures with various shapes were synthesized using a successive reduction method in this study. By means of galvanic replacement, twined Ag nanoparticles (NPs) and single-crystalline Ag nanowires (NWs) were adopted as templates, respectively, and alloyed with the same amount of Au...

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Autores principales: Tsai, Chi-Hang, Chen, Shih-Yun, Song, Jenn-Ming, Haruta, Mitsutaka, Kurata, Hiroki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2015
Materias:
Nano Express
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4644130/
https://www.ncbi.nlm.nih.gov/pubmed/26563266
http://dx.doi.org/10.1186/s11671-015-1141-7
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author Tsai, Chi-Hang
Chen, Shih-Yun
Song, Jenn-Ming
Haruta, Mitsutaka
Kurata, Hiroki
author_facet Tsai, Chi-Hang
Chen, Shih-Yun
Song, Jenn-Ming
Haruta, Mitsutaka
Kurata, Hiroki
author_sort Tsai, Chi-Hang
collection PubMed
description Au-Ag alloy nanostructures with various shapes were synthesized using a successive reduction method in this study. By means of galvanic replacement, twined Ag nanoparticles (NPs) and single-crystalline Ag nanowires (NWs) were adopted as templates, respectively, and alloyed with the same amount of Au(+) ions. High angle annular dark field-scanning TEM (HAADF-STEM) images observed from different rotation angles confirm that Ag NPs turned into AuAg alloy rings with an Au/Ag ratio of 1. The shifts of surface plasmon resonance and chemical composition reveal the evolution of the alloy ring formation. On the other hand, single-crystalline Ag NWs became Ag@AuAg core-shell wires instead of hollow nanostructure through a process of galvanic replacement. It is proposed that in addition to the ratio of Ag templates and Au ion additives, the twin boundaries of the Ag templates were the dominating factor causing hollow alloy nanostructures.
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spelling pubmed-46441302015-11-19 Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures Tsai, Chi-Hang Chen, Shih-Yun Song, Jenn-Ming Haruta, Mitsutaka Kurata, Hiroki Nanoscale Res Lett Nano Express Au-Ag alloy nanostructures with various shapes were synthesized using a successive reduction method in this study. By means of galvanic replacement, twined Ag nanoparticles (NPs) and single-crystalline Ag nanowires (NWs) were adopted as templates, respectively, and alloyed with the same amount of Au(+) ions. High angle annular dark field-scanning TEM (HAADF-STEM) images observed from different rotation angles confirm that Ag NPs turned into AuAg alloy rings with an Au/Ag ratio of 1. The shifts of surface plasmon resonance and chemical composition reveal the evolution of the alloy ring formation. On the other hand, single-crystalline Ag NWs became Ag@AuAg core-shell wires instead of hollow nanostructure through a process of galvanic replacement. It is proposed that in addition to the ratio of Ag templates and Au ion additives, the twin boundaries of the Ag templates were the dominating factor causing hollow alloy nanostructures. Springer US 2015-11-13 /pmc/articles/PMC4644130/ /pubmed/26563266 http://dx.doi.org/10.1186/s11671-015-1141-7 Text en © Tsai et al. 2015 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Nano Express
Tsai, Chi-Hang
Chen, Shih-Yun
Song, Jenn-Ming
Haruta, Mitsutaka
Kurata, Hiroki
Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures
title Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures
title_full Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures
title_fullStr Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures
title_full_unstemmed Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures
title_short Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures
title_sort effect of ag templates on the formation of au-ag hollow/core-shell nanostructures
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4644130/
https://www.ncbi.nlm.nih.gov/pubmed/26563266
http://dx.doi.org/10.1186/s11671-015-1141-7
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