{"id":84827,"date":"2021-10-14T13:53:46","date_gmt":"2021-10-14T10:53:46","guid":{"rendered":"https:\/\/www.technion.ac.il\/blog\/defects-in-gold-as-a-template-for-nanowire-growth\/"},"modified":"2021-10-14T13:53:46","modified_gmt":"2021-10-14T10:53:46","slug":"defects-in-gold-as-a-template-for-nanowire-growth","status":"publish","type":"post","link":"https:\/\/www.technion.ac.il\/en\/blog\/defects-in-gold-as-a-template-for-nanowire-growth\/","title":{"rendered":"Defects in Gold as a Template for Nanowire Growth"},"content":{"rendered":"

Technion researchers have presented an innovative method for the formation of nanowires. In it, the nanowires form within line defects that exist in metals. Such defects are known as dislocations. This is the first time that dislocation lines in a material of one kind serve as a template for the growth of a different inorganic material in the form of nanowires. The study, which was published in PNAS<\/em><\/a>, was led by Professor Boaz Pokroy and Ph.D. student Lotan Portal of the Faculty of Materials Science and Engineering and the Russell Berrie Nanotechnology Institute.<\/p>\n

\"Professor<\/a>
Professor Boaz Pokroy<\/figcaption><\/figure>\n

Dislocations are a significant phenomenon in materials science since they affect the material\u2019s properties on both the macro- and microscales. For example, a high dislocation density increases a metal\u2019s strength and hardness. The dislocation edges on metal surfaces and the atoms in their proximity tend to be more chemically activated compared to other atoms in the material and tend to facilitate various chemical reactions, such as corrosion and catalysis.<\/p>\n

\"Lotan<\/a>
Lotan Portal<\/figcaption><\/figure>\n

The researchers in Prof. Pokroy\u2019s group<\/a> created nanowires of gold-cyanide complex from classic Au-Ag alloy. In professional terminology, they synthesized inorganic gold(I)-cyanide (AuCN) systems in the shape of nanowires, using an autocatalytic reaction (i.e. through the acceleration of a reaction by one of its reactants). Gold-cyanide complex is used in numerous fields including ammonia gas detection (NH3<\/sub> sensors), catalysis (acceleration) of water-splitting reactions, and others.<\/p>\n

\"In<\/a>
In black and white: Scanning electron microscope image of a lateral section of a sample that contains a gold-cyanide nanowire created from Au-Ag (to a depth of 2 microns from the surface of the sample).<\/figcaption><\/figure>\n

In the process developed by the researchers, nanowires crystallize at the dislocation ends on the surface of the original gold-silver (Au-Ag) alloy, and the final structure obtained is classic nanoporous (sponge-like) gold, with a layer of nanowires emerging from it. Formation of the nanowires occurs during the classic selective dealloying process that separates the silver from the system and forms the nanoporous gold and is achieved only when the dislocation density exceeds a critical value, as presented in the kinetic model developed and demonstrated in the article.<\/p>\n

The model provides a possible route for growing one-dimensional inorganic complexes while controlling the growth direction, shape, and morphology of a crystal according to the original alloy\u2019s slip system. As mentioned, this scientific and technological achievement has numerous potential applications.<\/p>\n

\"In<\/a>
In the figure: A schematic drawing depicting 1D nucleation and growth of a gold-cyanide nanowire along a dislocation in the original alloy during the classic selective dealloying process.<\/figcaption><\/figure>\n

The research was sponsored by a European Research Council (ERC) Proof of Concept Grant (\u201cnp-Gold\u201d project) as part of the Horizon 2020 Program.<\/p>\n

For the article in PNAS<\/em> click here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Technion researchers have presented an innovative method for the formation of nanowires. In it, the nanowires form within line defects that exist in metals. Such defects are known as dislocations. This is the first time that dislocation lines in a material of one kind serve as a template for the growth of a different inorganic… Continue Reading Defects in Gold as a Template for Nanowire Growth<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[24],"tags":[],"class_list":["post-84827","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nDefects in Gold as a Template for Nanowire Growth - \u05d4\u05d8\u05db\u05e0\u05d9\u05d5\u05df-\u05de\u05db\u05d5\u05df \u05d8\u05db\u05e0\u05d5\u05dc\u05d5\u05d2\u05d9 \u05dc\u05d9\u05e9\u05e8\u05d0\u05dc<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.technion.ac.il\/en\/blog\/defects-in-gold-as-a-template-for-nanowire-growth\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Defects in Gold as a Template for Nanowire Growth - \u05d4\u05d8\u05db\u05e0\u05d9\u05d5\u05df-\u05de\u05db\u05d5\u05df \u05d8\u05db\u05e0\u05d5\u05dc\u05d5\u05d2\u05d9 \u05dc\u05d9\u05e9\u05e8\u05d0\u05dc\" \/>\n<meta property=\"og:description\" content=\"Technion researchers have presented an innovative method for the formation of nanowires. 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