{"id":55627,"date":"2022-12-06T15:52:16","date_gmt":"2022-12-06T13:52:16","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=55627"},"modified":"2022-12-06T15:52:16","modified_gmt":"2022-12-06T13:52:16","slug":"these-hugo-therssen-caracterisation-de-systemes-moleculaires-par-microcopie-a-sonde-locale-pour-des-applications-en-nanoelectronique-des-molecules-uniques-aux-cristaux-moleculaires","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/agenda\/these-hugo-therssen-caracterisation-de-systemes-moleculaires-par-microcopie-a-sonde-locale-pour-des-applications-en-nanoelectronique-des-molecules-uniques-aux-cristaux-moleculaires.html","title":{"rendered":"THESE : Hugo THERSSEN \u2013 Caract\u00e9risation de syst\u00e8mes mol\u00e9culaires par microcopie \u00e0 sonde locale pour des applications en nano\u00e9lectronique : des mol\u00e9cules uniques aux cristaux mol\u00e9culaires"},"content":{"rendered":"<div id='layer_slider_1'  class='avia-layerslider main_color avia-shadow  avia-builder-el-0  el_before_av_heading  avia-builder-el-first  container_wrap sidebar_right'  style='height: 261px;'  ><div id=\"layerslider_58_99xs18ufqkt7\" data-ls-slug=\"homepageslider\" class=\"ls-wp-container fitvidsignore ls-selectable\" style=\"width:1140px;height:260px;margin:0 auto;margin-bottom: 0px;\"><div class=\"ls-slide\" data-ls=\"duration:6000;transition2d:5;\"><img loading=\"lazy\" decoding=\"async\" width=\"2600\" height=\"270\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg\" class=\"ls-bg\" alt=\"\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg 2600w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-300x31.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-768x80.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1030x107.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1500x156.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-705x73.jpg 705w\" sizes=\"auto, (max-width: 2600px) 100vw, 2600px\" \/><ls-layer style=\"font-size:14px;text-align:left;font-style:normal;text-decoration:none;text-transform:none;font-weight:700;letter-spacing:0px;border-style:solid;border-color:#000;background-position:0% 0%;background-repeat:no-repeat;width:180px;height:30px;left:0px;top:231px;line-height:32px;color:#ffffff;border-radius:6px 6px 6px 6px;padding-left:50px;background-color:rgba(0, 0, 0, 0.57);\" class=\"ls-l ls-ib-icon ls-text-layer\" data-ls=\"minfontsize:0;minmobilefontsize:0;\"><i class=\"fa fa-quote-right\" style=\"color:#ffffff;margin-right:0.8em;font-size:1em;transform:translateY( -0.125em );\"><\/i>ACTUALITES<\/ls-layer><\/div><\/div><\/div><div id='after_layer_slider_1'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-55627'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_heading-982c3d41c1a6c51ad835054200a59598\">\n#top .av-special-heading.av-av_heading-982c3d41c1a6c51ad835054200a59598{\nmargin:0 0 10px 0;\npadding-bottom:4px;\n}\nbody .av-special-heading.av-av_heading-982c3d41c1a6c51ad835054200a59598 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-av_heading-982c3d41c1a6c51ad835054200a59598 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-av_heading-982c3d41c1a6c51ad835054200a59598 av-special-heading-h2  avia-builder-el-1  el_after_av_layerslider  el_before_av_hr  avia-builder-el-first'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >THESE : Hugo THERSSEN \u2013 Caract\u00e9risation de syst\u00e8mes mol\u00e9culaires par microcopie \u00e0 sonde locale pour des applications en nano\u00e9lectronique : des mol\u00e9cules uniques aux cristaux mol\u00e9culaires<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-18u73nj-dad6a947580930e400fc42ba200e80f1\">\n#top .hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1{\nmargin-top:5px;\nmargin-bottom:5px;\n}\n.hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1 .hr-inner{\nwidth:100%;\n}\n<\/style>\n<div  class='hr av-18u73nj-dad6a947580930e400fc42ba200e80f1 hr-custom  avia-builder-el-2  el_after_av_heading  el_before_av_textblock  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-thin'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-jriy64i8-2f4600354c0449b610997916bbd9b6bc'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" >\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-68e036126b913e5028f77311dc66b825\">\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825{\ncolor:#bfbfbf;\nborder-color:#bfbfbf;\n}\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825 .av-icon-char{\nfont-size:60px;\nline-height:60px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-68e036126b913e5028f77311dc66b825 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue8c9' data-av_iconfont='entypo-fontello' ><\/span><\/span>\n<p><strong>Hugo THERSSEN<br \/>\n<\/strong><\/p>\n<p>Soutenance : 14 D\u00e9cembre 2022 \u00e0 9h <strong><br \/>\n<\/strong>IEMN Amphitheatre - Central Laboratory - Villeneuve d'Ascq<\/p>\n<\/div><\/section>\n<section  class='av_textblock_section av-jtefqx33-628129dba2299b2ecd65ebfc92eac29d'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div  class='hr av-kjh3zw-4dff888f744b728a1aca9b3a0971493a hr-default  avia-builder-el-6  avia-builder-el-no-sibling'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<h5><strong><span style=\"color: #800000;\">Jury<br \/>\n<\/span><\/strong><\/h5>\n<p>Rapporteur Lionel PATRONE Universit\u00e9 Aix Marseille<br \/>\nCharg\u00e9 de recherche CNRS<\/p>\n<p>Rapporteur Philippe LECLERE Universit\u00e9 de Mons<br \/>\nProfessor<\/p>\n<p>Examinateur Frank PALMINO Universit\u00e9 Aix Marseille<br \/>\nProfessor<\/p>\n<p>Examinatrice Sylvie GODEY IEMN<br \/>\nIng\u00e9nieure de recherche CNRS<\/p>\n<p>Invit\u00e9 Dominique VUILLAUME IEMN<br \/>\nDirecteur de recherche CNRS<\/p>\n<p>Co-directeur de th\u00e8se Thierry MELIN IEMN<br \/>\nDirecteur de recherche CNRS<\/p>\n<p>Directeur de th\u00e8se St\u00e9phane LENFANT IEMN<br \/>\nDirecteur de recherche CNRS<\/p>\n<h5>Summary:<\/h5>\n<p>Ce manuscrit rapporte l\u2019\u00e9tude par microscopie \u00e0 sonde locale de mol\u00e9cules de \u03b1, \u03b3-bisdiph\u00e9nyl\u00e8ne-\u03b2-ph\u00e9nylallyl (BDPA), de 3,3\u2032,5,5\u2032-tetra-tert-butylazobenz\u00e8ne (TBA) et d\u2019analogue du bleu de Prusse (PBA) CoIII[FeII(CN)6] (not\u00e9 CsCoFe) pour des applications en nano\u00e9lectronique mol\u00e9culaire.<br \/>\nNous avons observ\u00e9 gr\u00e2ce \u00e0 la microscopie \u00e0 effet tunnel (STM) sous ultravide et \u00e0 basse temp\u00e9rature (4K), des auto-assemblages de BDPA sur Au(111), organis\u00e9s sous forme de cha\u00eenes. Ces cha\u00eenes \u00e0 une temp\u00e9rature \u2248 15 K, se comportent comme un oscillateur harmonique unidimensionnel gr\u00e2ce au couplage phonon-mol\u00e9cule. Nous avons observ\u00e9 que les vibrations de la cha\u00eene \u00e9taient att\u00e9nu\u00e9es ou arr\u00eat\u00e9es en fonction de la polarisation appliqu\u00e9e pendant l\u2019imagerie STM. Les \u00e9tats de charge des mol\u00e9cules sur le substrat ont \u00e9t\u00e9 \u00e9tudi\u00e9s par microscopie \u00e0 sonde de Kelvin sous ultra-vide.<br \/>\nLa mol\u00e9cule de TBA est un d\u00e9riv\u00e9 de l\u2019azobenz\u00e8ne, qui poss\u00e8de quatre groupes d\u2019espacement afin d\u2019\u00eatre d\u00e9coupl\u00e9 du substrat d\u2019or. Cette mol\u00e9cule est capable de commuter entre deux \u00e9tats stables isom\u00e9riques (trans-TBA et cis-TBA). Nous \u00e9tudions par STM et par microscopie \u00e0 force atomique sans contact sous ultravide avec une r\u00e9solution sub-mol\u00e9culaire, l\u2019effet du champ \u00e9lectrique et de l\u2019irradiation UV sur la monocouche de TBA d\u00e9pos\u00e9e sur un substrat Au(111), pour commuter l\u2019\u00e9tat isom\u00e9rique de la mol\u00e9cule, caract\u00e9ris\u00e9. Nous d\u00e9montrons que le champ \u00e9lectrique induit des points brillants d\u2019une hauteur de 0,25 \u00b1 0,02 nm, ces points sont associ\u00e9s \u00e0 l\u2019isom\u00e8re cis-TBA. L\u2019effet des irradiations UV quant \u00e0 lui va produire un autre effet, que nous supposons \u00eatre une d\u00e9t\u00e9rioration de la mol\u00e9cule de TBA.<br \/>\nLes mol\u00e9cules de PBA font partie de la grande famille des mat\u00e9riaux d\u2019oxydes m\u00e9talliques. Les PBAs forment des nanocristaux dont la taille est contr\u00f4lable en fonction du proc\u00e9d\u00e9 chimique appliqu\u00e9. Nous avons caract\u00e9ris\u00e9 \u00e9lectriquement par Conducting-AFM \u00e0 l\u2019air, des nanocristaux individuels de CsCoFe de taille 15, 30 et 50 nm . Nous observons que lorsque la taille du nanocristal augmente, le courant mesur\u00e9 par Conducting-AFM augmente \u00e9galement. Pour expliquer ce ph\u00e9nom\u00e8ne, nous consid\u00e9rons le contact pointe-mol\u00e9cule comme un m\u00e9tal-\u00a0\u00bb semi-conducteur \u00a0\u00bb et utilisons le mod\u00e8le de la double barri\u00e8re Schottky. Le mod\u00e8le montre que la hauteur de l\u2019une des barri\u00e8res de contact diminue de 0,34 eV \u00e0 0,23 eV lorsque la hauteur du nanocristal augmente.<br \/>\nCes travaux illustrent les effets du couplage d\u2019une mol\u00e9cule avec un substrat, et ouvre la voie \u00e0 des dispositifs mol\u00e9culaires.<\/p>\n<h5>Abstract:<\/h5>\n<p>This manuscript reports on scanning probe microscopy study of \u03b1, \u03b3-bisdiphenylene-\u03b2-phenylallyl (BDPA), 3,3\u2032,5,5\u2032-tetra-tert-butylazobenzene (TBA) and Prusian blue analogue (PBA) CoIII[FeII(CN)6] (noted CsCoFe) molecules for applications in nanotechnology and molecular electronics.<br \/>\nWe observed thanks to Scanning Tunneling Microscopy (STM) in ultra-high vacuum (UHV) at low temperature (4K), BDPA self-assemblies on Au(111) organized in chains. These chains behave like a one-dimensional harmonic oscillator at a temperature \u2248 15 K due to the phonon-molecule coupling. We observed that the vibrations of the chain were attenuated or stopped depending on the polarization applied during STM imaging. The charge states of the molecules on the substrate were studied by Kelvin Probe Force Microscopy in UHV.<br \/>\nThe TBA molecule is a derivative of the azobenzene molecule with four spacer groups for the decoupling of the molecule from the gold substrate. This molecule switches between two isomeric stable states (trans-TBA and cis-TBA). We study by STM and non-contact Atomic Force Microscopy in UHV with sub-molecular resolution the effect of the electric field and UV irradiation on TBA monolayers deposited on Au(111) substrate on the switching of the TBA molecule between these two isomeric states. We demonstrate that the electric field induces bright spots with a height of 0.25 \u00b1 0.02 nm, these spots are associated to the cis-TBA isomer. The effect of UV irradiation induces another effect, that we suppose is associated with a deterioration of the TBA molecule.<br \/>\nPBA molecules constitute a large family of materials with an open framework structure. PBA molecules form a nanocrystal whose size can be controlled according to the chemical process applied. We have electrically characterized by Conducting-AFM in air, single PBA CsCoFe nanocrystals with a typical size of 15, 30 and 50 nm. We observe that when the size of the nanocrystal increases, the recorded current measured by Conducting-AFM also increases. To explain this effect, we consider the tip-molecule contact as a metal-\u201csemi-conductor\u201d metal and use the Double Schottky barrier model. This model shows that the height of one of the contact barriers decreases from 0.34 eV to 0.23 eV when the height of the nanocrystal increases.<br \/>\nThis work illustrates the effects of coupling a molecule to a substrate and opens the way to molecular devices.<\/p>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":55633,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[65,87,84,316],"tags":[],"class_list":["post-55627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-agenda","category-agenda-en","category-agenda-en-en","category-theses-2022"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/55627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=55627"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/55627\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/55633"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=55627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=55627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=55627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}