Naslov (srp)

Синтеза хибридних наносистема Ag-Bi-I и Ag-Ag2S и испитивање њихове електронске структуре фотоелектронском спектроскопијом аеросола : докторска дисертација

Autor

Danilović, Danijela, 1992-

Doprinosi

Stojković Simatović, Ivana, 1979-
Božanić, Dušan K., 1976-
Damjanović-Vasilić, Ljiljana, 1971-
Cvjetićanin, Nikola, 1959-
Đoković, Vladimir, 1967-
Pajović, Jelena D., 1988-
Nedić Vasiljević, Bojana, 1983-

Opis (eng)

This dissertation concerns the synthesis of silver bismuth iodide (Ag-Bi-I) and silver-silversulfide (Ag-Ag2S) hybrid nanomaterials and analyzes of their structure, morphological andoptical properties as well as electronic structure.Ag-Bi-I rudorffites were successfully synthesized for the first time as ligand-free nanoma-terials, in two forms: as three-dimensional spherical aerosol nanoparticles of average size of100 nm and as 2D nanoplatelets with an average lateral dimension of 160 nm and thicknessof 4 nm. X-ray diffraction analysis showed that obtained nanoparticles have Ag3BiI6 rudorffiterhombohedral crystal structure. The electronic structure of isolated Ag-Bi-I nanoparticles wasinvestigated using synchrotron radiation soft X-ray aerosol photoelectron spectroscopy (XAPS).The ionization energy of obtained nanoparticles was determined to be 6.1 eV with respect to thevacuum. The valence electronic structure of Ag-Bi-I rudorffite nanoparticles was reconstructedusing photoelectron and absorption spectroscopy results. Ag-Ag2S Janus hybrid nanosystemthat consists of nanoparticles of noble metal Ag and semiconductor Ag2S was fabricated bysulfidation of previously synthesized silver nanoparticles with thioacetamide in the presence ofstabilizing agent. Transmission electron microscopy showed that the average size of the obta-ined nanoparticles was 16 nm and confirmed that they have Janus morphology. The valenceelectronic structure of Ag-Ag2S nanoparticles was studied by vacuum-ultraviolet synchrotronradiation angle-resolved photoelectron spectroscopy, using the velocity map imaging technique.The obtained results revealed that the valence band consists mainly of 4d and 5s levels of sil-ver and the ionization energy of the nanoparticles was found to be 4.5 eV. Additionally, thehybrid nanosystem that consists of Ag-Ag2S nanoparticles and TiO2 nanoparticles was fabri-cated and tested as light-driven nanomotors. By using optical microscopy, it was shown thatthese nanosystems can successfully actuate under near-infrared electromagnetic radiation

Opis (srp)

U okviru ove doktorske disertacije sintetisani su hibridni nanomaterijali srebro-bizmut-jodid (Ag-Bi-I) i srebro-srebro sulfid (Ag-Ag2S) i analizirana ihova struktur-na, morfoloxka i optiqka svojstva, kao i ihova elektronska struktura.Ag-Bi-I rudorfiti su po prvi put fabrikovani kao nanomaterijali, bez prisustvaliganada, u dve forme, kao trodimenzionalne sferne nanoqestice aerosola, proseqne ve-liqine 100 nm i kao 2D nanolistii proseqne lateralne dimenzije 160 nm i proseqnedeb ine oko 4 nm. Difrakcijom H-zraqea utvreno je da dobijene nanoqestice imajukristalnu strukturu koja odgovara Ag3BiI6 romboedarskom rudorfitnom kristalnom si-stemu. Elektronska struktura izolovanih Ag-Bi-I nanoqestica ispitana je fotoelektron-skom spektroskopijom aerosola sinhrotronskim zraqeem u oblasti mekog H-zraqea.Izmerena energija jonizacije Ag3BiI6 i Ag-Bi-I nanolistia iznosi 6,1 eV u odnosu na va-kuum. Pomou rezultata fotoelektronske spektroskopije i apsorpcione spektroskopijerekonstruisana je valentna elektronska struktura Ag-Bi-I nanoqestica rudorfita. Ag-Ag2S Janus hibridni nanosistem koji qine nanoqestice plemenitog metala Ag i polupro-vodnika Ag2S fabrikovan je metodom sulfidizacije prethodno formiranih nanoqesticasrebra tioacetamidom u prisustvu stabilizatora. Transmisionom elektronskom spek-troskopijom je utvreno da dobijene nanoqestice imaju proseqne dimenzije ∼ 16 nm i daimaju Janus morfologiju. Fotoelektronskom spektroskopijom aerosola sinhrotronskimzraqeem u dalekoj ultra ubiqastoj oblasti, tehnikom mapiraa brzina fotoelektrona,ispitana je valentna elektronska struktura Ag-Ag2S nanoqestica i ustanov eno je da va-lentnu zonu preteno qine 4d i 5s nivoi srebra, a da energija jonizacije iznosi 4,5 eV.Dodatno, formiran je hibridni nanosistem koji qine Ag-Ag2S Janus nanoqestice i TiO2nanoqestice, koji je iskorixen kao probni sistem za nanomotore koji su pokrenuti bli-skom infracrvenom svetlošću.

Opis (srp)

fizička hemija - fizička hemija materijala i fizička hemija - spektrohemija / physical chemistry -physical chemistry of materials and physical chemistry - spectrochemistry Datum odbrane: 07.12.2023.

Jezik

srpski

Datum

2023

Licenca

Ovo delo je licencirano pod uslovima licence
Creative Commons CC BY-NC-SA 3.0 AT - Creative Commons Autorstvo - Nekomercijalno - Deliti pod istim uslovima 3.0 Austria License.

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Predmet

OSNO - Opšta sistematizacija naučnih oblasti, Nanostrukture. Nanotehnologija

hibridni nanomaterijali, rudorfiti, srebro-bizmut-jodid, srebro - srebro sulfid, Janus nanoqestice, fotoelektronska spektroskopija

OSNO - Opšta sistematizacija naučnih oblasti, Nanostrukture. Nanotehnologija

hybrid nanomaterials, rudorffites, silver bismuth iodide, silver-silver sulfide, Janus nanoparticles, photoelectron spectroscopy