51. Electrochemical immunosensor functionalized with nanobodies for the detection of the toxic microalgae Alexandrium minutum using glassy carbon electrode modified with gold nanoparticlesSandra Oloketuyi, Elisa Mazzega, Janez Zavašnik, Kingkan Pungjunun, Kurt Kalcher, Ario De Marco, Eda Mehmeti, 2020, original scientific article Keywords: biosensors, toxic microalgae, nanobodies, impedance Published in RUNG: 07.02.2020; Views: 3244; Downloads: 0 This document has many files! More... |
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53. Looking for a topological insulator in the tetradymite familyZipporah Rini Benher, Sandra Gardonio, Mattia Fanetti, Polina M. Sheverdyaeva, Paolo Moras, Matjaž Valant, 2019, published scientific conference contribution abstract Abstract: Materials that are topological insulators (TI) manifest a novel state for their electrons. They possess topological surface states that are not destroyed by the presence of non-magnetic impurities on their surfaces. This unique property lies in the bulk band structure and it is typically found in narrow gap semiconductor with strong spin-orbit coupling.
Bi2Se3 and Bi2Te3 belong to the class of compounds called tetradymites and are considered as the 3D-prototypical TI materials. However, these compounds are not usually insulators but have metallic bulk conductivity as a consequence of intrinsic defect doping: vacancies and anti-site defects. For these reasons, it is difficult to electrically gate these materials for the manipulation and control of charge carriers for realizing devices. This led to the search for other topological materials, which might have better insulating behavior in their bulk.
Theoretical studies have pointed out that ternary variants of the Bi2Se3 and Bi2Te3, such as Bi2Te2Se, Bi2Te2S, Bi2Se2S Sb2Te2Se and Sb2Te2S, should be stable TIs and potentially offer a chemical way to control TI behavior, in particular by lowering native doping. Among the cited ternary compounds, Bi2Se2S should manifest a genuine topological spin-transport regime hosting an isolated Dirac cone with the Dirac point in the gap as well. However, it has been poorly studied from the TI experimental perspective.
Therefore, to uncover the full potential of the predicted topological electronic properties of the Bi-Se-S system, in this presentation we will revisit the crystallographic and electronic structure of Bi2Se3-Bi2S3 solid solutions. The combined use of bulk and surface sensitive techniques such as X-ray diffraction (XRD), low energy electron diffraction (LEED), scanning electron microscopy (SEM) with Energy Dispersive X-ray spectroscopy (EDX) and X-ray photoemission spectroscopy (XPS) was applied to analyze single crystal samples grown by us. The quality of the single crystals was suitable for rigorous measurement of the electronic properties by means of Angle Resolved Photoemission Spectroscopy. We unambiguously showed that within a certain solid solution range, the single crystals of Bi-Se-S have a rombohedral structure with the topological surface states as theoretically predicted. Keywords: topological insulators, ternary tetradymite, electronic properties. Published in RUNG: 19.12.2019; Views: 3867; Downloads: 0 This document has many files! More... |
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55. STUDY OF ELECTRONIC STATES OF THIN METAL FILMS ON HEAVY METAL SURFACES : MASTER'S THESISLuka Novinec, 2018, master's thesis Abstract: V magistrskem delu smo se osredoto£ili na pripravo in karakterizacijo
heterogenih ve£plastnih tankih filmov sestavljenih iz kovin ter teºkih kovin.
Za izdelavo vzorcev smo izbrali dve feromagnetni kovini, Fe in Gd, ter
eno divalentno kovino iz redkih zemelj, Yb. Tanke filme smo nana²ali na
kristalno povr²ino volframa W(110) ter molibdena Mo(110). V primeru Fe
na povr²ini W(110) in Mo(110) ter Yb na pov²ini Mo(110) smo uspe²no
dolo£ili pogoje, potrebne za nana²anje atomsko enakomernih filmov. S pomo
£jo kotno odvisne fotoemisije smo preu£evali kvantna stanja v Fe in Yb
filmih na Mo in W kristalih. Celotno eksperimentalno delo je potekalo na
ºarkovnih linijah VUV-Photoemission in²tituta (ISM-CNR) ter BaDElPh
pri sinhrotronu Elettra v Trstu. Keywords: electronic states, thin metal films, heavy metal surfaces Published in RUNG: 04.12.2019; Views: 4004; Downloads: 105 Full text (25,10 MB) |
56. Bacterial surface display of nanobodies against cancer and toxic micoalgal cellsSandra Oloketuyi, Carina Dilkaute, Elisa Mazzega, Joachim Jose, Ario De Marco, 2019, published scientific conference contribution abstract Keywords: bacteria surface display, nanobodies, HER2, A. minutum Published in RUNG: 18.11.2019; Views: 3354; Downloads: 99 Full text (12,18 KB) |
57. Functionalized nanobodies: A bio-recognition molecule for the detection of the toxic microalgae Alexandrium minutum by means of an electrochemical immunosensorSandra Oloketuyi, Elisa Mazzega, Eda Mehmeti, Kurt Kalcher, Ario De Marco, 2019, published scientific conference contribution abstract Keywords: Biosensors, nanobodies, impedance, immunocapture, SpyTag Published in RUNG: 18.11.2019; Views: 4128; Downloads: 102 Full text (12,70 KB) |
58. Quantitative detection of Microcystis aeruginosa in fresh water using single domain antibodies (VHHs)Gbenga Folorunsho Oginni, Sandra Oloketuyi, Elisa Mazzega, Mladen Franko, Hanna Budasheva, Dorota Korte, Ario De Marco, published scientific conference contribution abstract Keywords: thermal lens spectrometry, nanobodies, fluobodies, cyanobacteria Published in RUNG: 18.11.2019; Views: 3596; Downloads: 122 Full text (15,09 KB) |
59. A compact nanobody-DNAzyme conjugate enables antigen detection and signal amplificationGiulio Bernardinelli, Sandra Oloketuyi, Franziska Werner, Elisa Mazzega, Bjorn Hogberg, Ario De Marco, 2020, original scientific article Keywords: DNAzyme, nanobodies, diagnostics, A. minutum Published in RUNG: 10.11.2019; Views: 3334; Downloads: 0 This document has many files! More... |
60. Synthesis of adsorbent-free ultrathin Bi2Se3 Topological Insulator Platelets and Its Inherent Surface PropertiesBlaž Belec, Katja Ferfolja, Tanja Goršak, Nina Kostevšek, Sandra Gardonio, Mattia Fanetti, Matjaž Valant, 2019, published scientific conference contribution abstract Keywords: Bismuth selenide, topological insulator, hydrothermal synthesis, surface properties Published in RUNG: 30.09.2019; Views: 3358; Downloads: 0 This document has many files! More... |