zaključna naloga
Lucija Bučar (Author), Miha Škarabot (Mentor), Marion Van Midden (Co-mentor)

Abstract

Z vrstičnim tunelskim mikroskopom lahko preučujemo strukturo površin na atomskem nivoju ter vezavo adsorbatov na njih. Preučevali smo površine Cu(111), izolativno plast CuN na Cu(111), Ag(111) in Au(111). Na čistih površinah smo opazovali atomske stopnice in stoječa valovanja na njih ter na podlagi izmerjenih višin stopnic določili kalibracijo mikroskopa pri različnih temperaturah. V primeru CuN in Au(111) pa smo opazili tudi zanimivo rekonstrukcijo površine. Za Au(111) je značilna struktura ribje kosti, ki izhaja iz prehoda med strukturo ploskovno centrirane kocke v heksagonalni gosti zlog, na površini CuN pa pride do rekonstrukcije površine Cu(111) v pseudo-Cu(100), zaradi vezave dušikovih atomov na površino. V drugem delu so predstavljeni eksperimenti samourejanja molekul 2-merkaptobenzi-midazola (2-MBI) na zgoraj omenjene površine. Za te molekule vemo, da so dobri organski inhibitorji korozije in se dobro vežejo na baker, zato nas je zanimalo, kako se bodo te molekule obnašale na bakru podobnih površinah ter v primeru, ko so razklopljene od podlage. Ugotovili smo, da se 2-MBI ne veže dobro na CuN plast, tako kot ne na čisto površino Ag(111). Opazili smo, da so molekule na teh površinah mobilne in se raje vežejo med sabo kot na podlago. Zato na teh površinah nismo opazili nobenih posebnih vzorcev samoureditve molekul na podlagi, kot je bilo to opaženo na čisti površini Cu(111).

Keywords

vrstična tunelska mikroskopija;kalibracija;samourejanje;2-merkaptobenzimidazol;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FMF - Faculty of Mathematics and Physics
Publisher: [L. Bučar]
UDC: 539.2
COBISS: 77394435 Link will open in a new window
Views: 206
Downloads: 13
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Other data

Secondary language: English
Secondary title: The role of the substrate in the self-assembly of 2-mercaptobenzimidazole
Secondary abstract: Using a scanning tunneling microscope, we can study the structure of surfaces at the atomic level and the binding of adsorbates on them. The surfaces of Cu(111), the insulating layer of CuN on Cu(111), Ag(111) and Au(111) were studied. On clean surfaces, we observed atomic steps and standing waves on them. Based on the measured steps heights, we determined the calibration of the microscope at different temperatures. An interesting surface reconstruction was observed for the CuN and Au(111) surfaces. Au(111) is characterized by a herringbone structure resulting from the transition between the face-centered cubic structure to a hexagonal close-packed one, and at the CuN surface we observed a reconstruction of the Cu(111) surface into pseudo-Cu(100) which occurs due to the binding of nitrogen atoms. In the second part experiments of the self-assembly of 2-mercaptobenzimidazole (2-MBI) molecules on the above-mentioned surfaces are presented. We know that these molecules are good organic corrosion inhibitors and bind well to copper, so we were interested in how these molecules will behave on copper-like surfaces and what their behaviour will be like when they are decoupled from the substrate. We found that 2-MBI only weakly binds to the CuN layer and Ag(111). We observed that molecules are mobile on these surfaces and that they prefer to form bonds between themselves rather than with the surface atoms. In contrast to Cu(111), no ordered self-assembly structures could be observed in our experiments.
Secondary keywords: scanning tunneling microscopy;calibration;self-assembly;2-mercaptobenzimidazole;
Type (COBISS): Final paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za fiziko
Pages: 42 str.
ID: 13411329