Приказ основних података о дисертацији
Elektronski transport i rektifikacija transverzalne električne struje kroz DNK nukleotide u nanoprocepu
Electronic transport and rectification of transversal electric current through DNA nucleotides in a nanogap
dc.contributor.advisor | Dražić, Miloš | |
dc.contributor.other | Poparić, Goran | |
dc.contributor.other | Nikolić, Božidar | |
dc.contributor.other | Šljivančanin, Željko | |
dc.creator | Đurišić, Ivana V. | |
dc.date.accessioned | 2022-11-08T07:59:08Z | |
dc.date.available | 2022-11-08T07:59:08Z | |
dc.date.issued | 2022-05-18 | |
dc.identifier.uri | https://eteze.bg.ac.rs/application/showtheses?thesesId=8799 | |
dc.identifier.uri | https://plus.cobiss.net/cobiss/sr/sr/bib/78396937 | |
dc.identifier.uri | https://nardus.mpn.gov.rs/handle/123456789/20802 | |
dc.description.abstract | Sekvenciranje DNK sledeće generacije (pouzdano, brzo i jeftino i ima mogućnost očitavanja sekvence lanaca dužine jednog hromozoma), značajno je za primene u zdravstvu, naročito u personalizovanoj medicini, biotehnologiji i bezbednosti, sa mogućim dubokim uticajem na društvo. Pristupi zasnovani na nanoporama pojavili su se kao platforme za sekvenciranje DNK i proteina, gde varijacija jonske struje tokom elektroforetičke translokacije jednolančane DNK (jDNK) kroz nanoporu dekodira sekvencu nukleotida. Uprkos napretku, izazovi u rezoluciji i očitavanju dugačkih lanaca zahtevaju nove pristupe. Zarad povećanja rezolucije, nanoelektrode se mogu postaviti na obodima nanopore da bi se iskoristila transverzalna elektronska struja tuneliranja kroz nukleotide i unakrsno korelalisala sa jonskom radi pouzdanijeg očitavanja. U ovoj disertaciji [1,2,3] izučavane su elektronske i transportne osobine nukleotida u nanoprocepu između elektroda od ugljeničnih nanocevi terminisanih azotom u cilju njihove moguće primene u sekvenciranju jDNK koristeći teoriju funkcionala gustine i formalizam neravnotežne Grinove funkcije. Na osnovu numerički izračunate I-V karakteristike za različite nukleotide predloženo je da se rektifikacija struje (odgovor na kvadratne pulseve naizmeničnog napona) nukleotida koristi kao dobar parametar za očitavanje sekvence DNK koji poseduje rezoluciju od jednog nukleotida zbog svoje visoke selektivnosti i robustnosti orijentacije molekula u odnosu na elektrode. Rektifikacija nastaje zbog naponske zavisnosti asimetrije otpora na interfejsima nukleotid-elektroda. Asimetrija indukuje naelektrisavanje molekula i to da energija HOMO prati promenu elektrohemijskog potencijala jedne od elektroda, potpomognuto efektom električnog polja unutar procepa izazvanog dipolima na krajevima elektroda. | sr |
dc.description.abstract | Next-generation DNA sequencing (reliable, fast, and inexpensive, and capable of reading a single-chromosome-size chains) is great importance for applications in healthcare, especially personalized medicine, biotechnology, and security, with potentially profound societal impacts. Nanopore-based approaches have emerged as platforms for DNA and protein sequencing, where ionic current variation during singlestranded DNA (ssDNA) electrophoretic translocation through the nanopore decodes the nucleotide sequence. Despite progress, the challenges in resolving and reading long chains require new approaches. To increase the resolution, side-embedded nanoelectrodes could be placed on nanopore edges to exploit the transverse electronic tunneling current through nucleotides and cross-correlate with the ionic current for a more reliable reading. In this dissertation, the electronic and transport properties of nucleotides placed in a nanogap between nitrogen-terminated carbon nanotube electrodes were studied for their possible application in ssDNA sequencing using density functional theory and non-equilibrium Green's function formalism. Based on numerically calculated I-V characteristics for different nucleotides, a current rectification (response to square pulses of alternating voltage) of nucleotides is proposed as a good parameter for DNA sequence readout with a resolution of one nucleotide due to its high selectivity and robustness to electrode-molecule orientation. Rectification arises because of biasdependent resistance asymmetry at the nucleotide-electrode interfaces. The asymmetry induces molecular charging and the HOMO energy pinning to the electrochemical potential of one of the electrodes, assisted by an in-gap electric-field effect caused by dipoles at the terminated electrode ends. | en |
dc.format | application/pdf | |
dc.language | sr | |
dc.publisher | Универзитет у Београду, Физички факултет | sr |
dc.rights | openAccess | en |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.source | Универзитет у Београду | sr |
dc.subject | DNA sequencing | en |
dc.subject | termination | en |
dc.subject | nanogap | en |
dc.subject | field effect | en |
dc.subject | current rectification | en |
dc.subject | local gating | en |
dc.subject | electronic transport | en |
dc.subject | molecular level pinning | en |
dc.subject | DFT – Density Functional Theory | en |
dc.subject | NEGF – Non-Equilibrium Green’s Function | en |
dc.title | Elektronski transport i rektifikacija transverzalne električne struje kroz DNK nukleotide u nanoprocepu | sr |
dc.title.alternative | Electronic transport and rectification of transversal electric current through DNA nucleotides in a nanogap | en |
dc.type | doctoralThesis | |
dc.rights.license | BY-NC-ND | |
dc.identifier.fulltext | http://nardus.mpn.gov.rs/bitstream/id/150810/Doktorat_Ivana.pdf | |
dc.identifier.fulltext | http://nardus.mpn.gov.rs/bitstream/id/152535/Referat.pdf | |
dc.identifier.rcub | https://hdl.handle.net/21.15107/rcub_nardus_20802 |