Синтеза хибридних наносистема Ag-Bi-I и Ag-Ag2S и испитивање њихове електронске структуре фотоелектронском спектроскопијом аеросола
Synthesis of Ag-Bi-I and Ag-Ag2S hybrid nanosystems and investigation on their electronic structure using aerosol photoelectron spectroscopy
Докторанд
Danilović, DanijelaМентор
Cvjetićanin, NikolaЧланови комисије
Božanić, Dušan K.Đoković, Vladimir
Damjanović-Vasilić, Ljiljana
Nedić Vasiljević, Bojana
Метаподаци
Приказ свих података о дисертацијиСажетак
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 prisustva
liganada, u dve forme, kao trodimenzionalne sferne nanoqestice aerosola, proseqne ve-
liqine 100 nm i kao 2D nanolistii proseqne lateralne dimenzije 160 nm i proseqne
deb ine oko 4 nm. Difrakcijom H-zraqea utvreno je da dobijene nanoqestice imaju
kristalnu 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 spektroskopije
rekonstruisana 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 nanoqestica
srebra tioacetamidom u prisustvu stabilizatora. Transmisionom elektronskom spek-
troskopijom je utvreno da dobijene nanoqestice imaju proseqne dimenzije ∼ 16 nm i da
imaju Janus morfologiju. Fotoelektronskom spektroskopijom aerosola sinhrotronskim
zraqeem 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 TiO2
nanoqestice, koji je iskorixen kao probni sistem za nanomotore koji su pokrenuti bli-
skom infracrvenom svetlošću.
This dissertation concerns the synthesis of silver bismuth iodide (Ag-Bi-I) and silver-silver
sulfide (Ag-Ag2S) hybrid nanomaterials and analyzes of their structure, morphological and
optical 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 of
100 nm and as 2D nanoplatelets with an average lateral dimension of 160 nm and thickness
of 4 nm. X-ray diffraction analysis showed that obtained nanoparticles have Ag3BiI6 rudorffite
rhombohedral crystal structure. The electronic structure of isolated Ag-Bi-I nanoparticles was
investigated 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 the
vacuum. The valence electronic structure of Ag-Bi-I rudorffite nanoparticles was reconstructed
using photoe...lectron and absorption spectroscopy results. Ag-Ag2S Janus hybrid nanosystem
that consists of nanoparticles of noble metal Ag and semiconductor Ag2S was fabricated by
sulfidation of previously synthesized silver nanoparticles with thioacetamide in the presence of
stabilizing 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 valence
electronic structure of Ag-Ag2S nanoparticles was studied by vacuum-ultraviolet synchrotron
radiation 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, the
hybrid 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 that
these nanosystems can successfully actuate under near-infrared electromagnetic radiation