{"id":43408,"date":"2025-05-15T21:00:09","date_gmt":"2025-05-15T15:30:09","guid":{"rendered":"https:\/\/www.nextias.com\/ca\/?p=43408"},"modified":"2025-05-15T21:00:27","modified_gmt":"2025-05-15T15:30:27","slug":"breakthrough-making-2d-metals","status":"publish","type":"post","link":"https:\/\/www.nextias.com\/ca\/current-affairs\/15-05-2025\/breakthrough-making-2d-metals","title":{"rendered":"Breakthrough in Making 2D Metals"},"content":{"rendered":"\n<p><strong>Syllabus: GS3\/Science and Technology<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Context<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A team of Chinese scientists reported a new method to create true <strong>2D sheets of metals<\/strong> like bismuth, gallium, indium, tin, and lead.\n<ul class=\"wp-block-list\">\n<li>This could pave the way for next-generation <strong>quantum and electronic technologies<\/strong>, including topological insulators.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-background\" style=\"background-color:#ebecf0\"><tbody><tr><td><strong>Quantum Dot and Quantum Confinement<\/strong><br>&#8211; <strong>Quantum Dot:<\/strong> A semiconductor particle only a few nanometers in size; behaves like a &#8220;giant atom&#8221; due to restricted electron movement.<br>&#8211; <strong>Quantum Confinement: <\/strong>When electron movement is restricted to a small space, energy levels become quantized, like in atoms.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Low-Dimensional Materials<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A material is described <strong>as 1D or 2D <\/strong>depending on <strong>how much it confines its electrons.\u00a0<\/strong><\/li>\n\n\n\n<li>2D metals are <strong>ultra-thin layers of metal atoms<\/strong>, usually just 1\u20132 atoms thick, where electrons are confined to move only in two dimensions.<\/li>\n\n\n\n<li><strong>Graphene is a famous 2D material: <\/strong>It consists of a single sheet of carbon atoms bonded to each other in a hexagonal pattern.\n<ul class=\"wp-block-list\">\n<li>The electrons in this sheet can only move around in two dimensions, thus 2D.\u00a0<\/li>\n\n\n\n<li>As a result they behave as if they don\u2019t have mass, for example, giving rise to properties not seen in other materials.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Challenges in Making 2D Metals<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Unlike carbon, which easily forms 2D sheets (graphene), metal atoms prefer bonding in 3D.<\/li>\n\n\n\n<li>Attempts to make atom-thin metal sheets have largely failed or produced sheets only a few nanometers thick \u2014 too thick for true quantum confinement.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Breakthrough Method: The 2D Sandwich Technique<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Metal powder is melted between MoS\u2082-coated sapphire plates and compressed under 200 million Pa pressure, forming ultra-thin sheets \u2014 like bismuth, just 6.3 \u00c5 thick (about two atoms deep).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why Do 2D Metals Matter?<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Expected Properties:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Topological Insulation: Conducts electricity only along edges, not across the surface.<\/li>\n\n\n\n<li>Nonlinear Hall Effect: Generates perpendicular voltage under electric field.<\/li>\n\n\n\n<li>Field Effect Tunability: Electrical conductivity controlled via external fields.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Applications:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Ultra-sensitive sensors (medical\/military).<\/li>\n\n\n\n<li>High-efficiency quantum computing.<\/li>\n\n\n\n<li>Next-gen electronic and photonic devices.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>Source: <\/strong><a href=\"https:\/\/www.thehindu.com\/sci-tech\/science\/scientists-finally-make-strange-2d-metals-sought-for-future-technologies\/article69574853.ece#:~:text=This%20is%20why%20scientists%20have,problem%3A%20the%20metal%20atoms%20themselves&amp;text=A%20quantum%20dot%20is%20a,only%20a%20few%20nanometres%20wide.\" rel=\"nofollow noopener\" target=\"_blank\"><strong>TH<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<h3><strong>Context<\/strong><\/h3>\n<li class=\"ms-5\">A team of Chinese scientists reported a new method to create true 2D sheets of metals like bismuth, gallium, indium, tin, and lead.<\/li>\n<p><\/p>\n<h3><strong>Challenges in Making 2D Metals<\/strong><\/h3>\n<li class=\"ms-5\">Unlike carbon, which easily forms 2D sheets (graphene), metal atoms prefer bonding in 3D.<\/li>\n<li class=\"ms-5\">Attempts to make atom-thin metal sheets have largely failed or produced sheets only a few nanometers thick \u2014 too thick for true quantum confinement.<\/li>\n<p><a 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