{"id":1794,"date":"2013-07-25T18:30:16","date_gmt":"2013-07-25T18:30:16","guid":{"rendered":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/?p=1794"},"modified":"2013-07-25T18:30:16","modified_gmt":"2013-07-25T18:30:16","slug":"charge-transfer-at-junctions-of-a-single-layer-of-graphene-and-a-metallic-single-walled-carbon-nanotube","status":"publish","type":"post","link":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/charge-transfer-at-junctions-of-a-single-layer-of-graphene-and-a-metallic-single-walled-carbon-nanotube\/","title":{"rendered":"Charge Transfer at Junctions of a Single Layer of Graphene and a Metallic Single Walled Carbon Nanotube"},"content":{"rendered":"<p>In this work we fabricate and study junction between a single walled carbon nanotube (SWNT) and a monolayer of graphene for the first time<sup>[<a href=\"#footnote_0_1794\" id=\"identifier_0_1794\" class=\"footnote-link footnote-identifier-link\" title=\"G.L.C. Paulus, Q.H. Wang, Z.W. Ulissi, T.P. McNicholas, A. Vijayaraghaan, C.-J. Shih, Z. Jin, M.S. Strano, &ldquo;Charge transfer at junctions of a single layer of graphene and a metallic single walled carbon nanotube,&rdquo; Small, vol. 9, no. 11, pp. 1954-1963, June 2013.\">1<\/a>]<\/sup>. A single layer graphene (SLG) sheet grown by chemical vapor deposition (CVD) is transferred onto a SiO<sub>2<\/sub>\/Si wafer with aligned CVD-grown SWNTs. Raman spectroscopy is used to identify metallic-SWNT\/SLG junctions, and we report a method for spectroscopic deconvolution of the overlapping G peaks of the SWNT and the SLG by making use of the polarization dependence of the SWNT<sup>[<a href=\"#footnote_1_1794\" id=\"identifier_1_1794\" class=\"footnote-link footnote-identifier-link\" title=\"G.S. Duesberg, I. Loa, M. Burghard, K. Syassen, S. Roth, &ldquo;Polarized raman spectroscopy on isolated single-wall carbon nanotubes,&rdquo; Physical Review Letters, vol. 85, no. 25, pp. 5436-5439, December 2000.\">2<\/a>]<\/sup>. A comparison of the Raman peak positions and intensities of the individual SWNT and graphene to those of the SWNT-graphene junction indicates an electron transfer of 1.12 x 10<sup>13<\/sup> cm<sup>-2<\/sup> from the SWNT to the graphene. This direction of charge transfer is in agreement with the work functions of the SWNT and graphene<sup>[<a href=\"#footnote_2_1794\" id=\"identifier_2_1794\" class=\"footnote-link footnote-identifier-link\" title=\"V. Barone, J.E. Peralta, J. Uddin, G.E. Scuseria, Journal of Chemical Physics, vol. 124, no. 2, pp. 024709 (1-5), January 2006.\">3<\/a>]<\/sup>. We find that the compression of the SWNT by the graphene increases the width of the radial breathing mode (RBM) peak from 3.6 +\/-0.3 to 4.6+\/-0.5 cm<sup>-1<\/sup> and that of the G peak from 13+\/-1 to 18+\/-1 cm<sup>-1<\/sup>, in reasonable agreement with our molecular dynamics simulations. However, we conclude that the RBM and G peak position shifts are primarily due to charge transfer with minimal contributions from strain. With this method, we demonstrate the ability to dope graphene with nanometer resolution.<\/p>\n<ol class=\"footnotes\"><li id=\"footnote_0_1794\" class=\"footnote\">G.L.C. Paulus, Q.H. Wang, Z.W. Ulissi, T.P. McNicholas, A. Vijayaraghaan, C.-J. Shih, Z. Jin, M.S. Strano, \u201cCharge transfer at junctions of a single layer of graphene and a metallic single walled carbon nanotube,\u201d <i>Small,<\/i> vol. 9, no. 11, pp. 1954-1963, June 2013. [<a href=\"#identifier_0_1794\" class=\"footnote-link footnote-back-link\">&#8617;<\/a>]<\/li><li id=\"footnote_1_1794\" class=\"footnote\">G.S. Duesberg, I. Loa, M. Burghard, K. Syassen, S. Roth, \u201cPolarized raman spectroscopy on isolated single-wall carbon nanotubes,\u201d <i>Physical Review Letters<\/i>, vol. 85, no. 25, pp. 5436-5439, December 2000. [<a href=\"#identifier_1_1794\" class=\"footnote-link footnote-back-link\">&#8617;<\/a>]<\/li><li id=\"footnote_2_1794\" class=\"footnote\">V. Barone, J.E. Peralta, J. Uddin, G.E. Scuseria, <i>Journal of Chemical Physics<\/i>, vol. 124, no. 2, pp. 024709 (1-5), January 2006. [<a href=\"#identifier_2_1794\" class=\"footnote-link footnote-back-link\">&#8617;<\/a>]<\/li><\/ol>","protected":false},"excerpt":{"rendered":"<p>In this work we fabricate and study junction between a single walled carbon nanotube (SWNT) and a monolayer of graphene&#8230;<\/p>\n","protected":false},"author":370,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6083],"tags":[12779,12713],"_links":{"self":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/posts\/1794"}],"collection":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/users\/370"}],"replies":[{"embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/comments?post=1794"}],"version-history":[{"count":2,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/posts\/1794\/revisions"}],"predecessor-version":[{"id":2268,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/posts\/1794\/revisions\/2268"}],"wp:attachment":[{"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/media?parent=1794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/categories?post=1794"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mtlsites.mit.edu\/annual_reports\/2013\/wp-json\/wp\/v2\/tags?post=1794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}