JAUNU 1D ZNO/PDA KODOLA-ČAULAS NANOSTRUKTŪRU IZVEIDE AR UZLABOTĀM UZBŪVES, ELEKTRONISKAJĀM, OPTISKAJĀM UN JUTĪBAS ĪPAŠĪBĀM
Date
2020
Authors
Damberga, Daina
Journal Title
Journal ISSN
Volume Title
Publisher
Latvijas Universitāte
Abstract
Darbā izveidoti un pētīti viendimensionāli (1D) cinka oksīda (ZnO) nanovadi, kas veido kodola-čaulas nanostruktūru ar polidopamīnu (PDA). ZnO iegūts hidrotermālās audzēšanas ceļā un apklāts ar PDA slāni, izmantojot ķīmiskās nogulsnēšanās metodi. Analizētas iegūtā materiāla optiskās, uzbūves un elektroniskās īpašības. Ar fotoluminiscenci un fotoelektroķīmisko metodi pētīta virsmas jutība un kinētiskā reakcija pret biomolekulu: vērša seruma albumīnu. Noteikts, ka ZnO ar PDA savienojas caur hidroksīda –OH grupām, PDA slāņa nogulsnēšanās rezultātā samazinās ZnO defektu koncentrācija. PDA slānis uzlabo strāvas plūsmu caur ZnO. Ultravioletā ierosme neietekmē šo strāvu. Nanostruktūrās novērots elektrohromiskais efekts.
In the thesis one-dimensional (1D) nanofibers with zinc oxide (ZnO) core and polydopamine (PDA) shell are made and investigated. ZnO is obtained by hydrothermal growth and coated with PDA using chemical bath deposition. Optical, structural and electronical properties have been investigated. Surface sensitivity and kinetic reaction to biomolecule: bovine serum albumin has been investigates with photoluminescence and photoelectrochemical methods. It has been determined that ZnO bonds with PDA through hydroxide –OH groups. Deposition of PDA layer results in decreased ZnO defect concentration. PDA layer improves current through ZnO. Ultraviolet excitation doesn’t affect this current. Electrochemical effect is present in these nanostructures.
In the thesis one-dimensional (1D) nanofibers with zinc oxide (ZnO) core and polydopamine (PDA) shell are made and investigated. ZnO is obtained by hydrothermal growth and coated with PDA using chemical bath deposition. Optical, structural and electronical properties have been investigated. Surface sensitivity and kinetic reaction to biomolecule: bovine serum albumin has been investigates with photoluminescence and photoelectrochemical methods. It has been determined that ZnO bonds with PDA through hydroxide –OH groups. Deposition of PDA layer results in decreased ZnO defect concentration. PDA layer improves current through ZnO. Ultraviolet excitation doesn’t affect this current. Electrochemical effect is present in these nanostructures.
Description
Keywords
Fizika , cinka oksīds , polidopamīns , 1D nanostruktūra , fotoluminiscence