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Anisotropic deformation of colloidal particles under 4 MeV Cu ions irradiation
Ajman Univ, U Arab Emirates.
Linköping University, Department of Science and Technology, Physics, Electronics and Mathematics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8985-0604
Eindhoven Univ Technol, Netherlands.
2022 (English)In: Materials Research Express, E-ISSN 2053-1591, Vol. 9, no 8, article id 086506Article in journal (Refereed) Published
Abstract [en]

Anisotropic deformation of colloidal particles was investigated under ion irradiation with 4 MeV Cu ions. In this study, 0.5 mu m-diameter colloidal silica particles, 0.5 mu m-diameter Au-silica core-shell particles, and 15 nm-diameter Au colloids embedding in a planar Si/SiO2 matrix were irradiated with 4 MeV Cu ions at room temperature and normal incidence. In colloidal silica particles, ion beam irradiation causes dramatic anisotropic deformation; silica expands perpendicular to the beam and contracts parallel, whereas Au cores elongate. Au colloids in a planar SiO2 matrix were anisotropically transformed from spherical colloids to elongated nanorods by irradiating them with 4 MeV Cu ions. The degree of anisotropy varied with ion flux. Upon irradiating the embedded Au colloids, dark-field light scattering experiments revealed a distinct color shift to yellow, which indicates a shift in surface plasmon resonance. A surface plasmon resonance measurement reveals the plasmon resonance bands are split along the arrays of Au colloids. Our measurements have revealed resonance shifts that extend into the near-infrared spectrum by as much as 50 nm.

Place, publisher, year, edition, pages
IOP Publishing Ltd , 2022. Vol. 9, no 8, article id 086506
Keywords [en]
silica dispersion; stober method; silica- au core-shell; au colloids; anisotropic deformation; localized surface plasmons
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:liu:diva-187882DOI: 10.1088/2053-1591/ac87efISI: 000842247300001OAI: oai:DiVA.org:liu-187882DiVA, id: diva2:1691835
Note

Funding Agencies|Ajman University Internal Research Grant, UAE [2021-IRG-HBS-14]

Available from: 2022-08-31 Created: 2022-08-31 Last updated: 2024-01-08
In thesis
1. Composite Nanostructured Materials for Renewable Energy Applications
Open this publication in new window or tab >>Composite Nanostructured Materials for Renewable Energy Applications
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Komposit Nanostrukturerade Material för Tillämpningar för Förnybar Energi
Abstract [en]

Diverse sources of energy are becoming increasingly significant in today's world. The most common source of energy today is fossil fuels, such as coal, oil, and gas. While this energy source has many advantages, it also comes with many problems. In order to meet this demand, environmentally friendly and sustainable alternatives to energy are urgently needed. Renewable energy such as hydro, wind, photovoltaics, biomass, and geothermal is an attractive and promising kind of energy. Solar energy is among the most efficient, cleanest, and cheapest sources of energy. In this thesis, two photo-processes are utilized to produce solar energy using nanostructured materials. One is photocatalysis, mainly photoelectrochemical (PEC) water splitting for hydrogen production and photodegradation of organic dyes, and another is a sunlight-powered photovoltaic cell.  

In this thesis, we aim to demonstrate optimized low-cost sustainable electrodes based on nanostructured materials for solar energy applications. For PEC water splitting two materials namely ZnO NRs and CuO NLs are fabricated by hydrothermal methods followed by deposition of different materials such as Ag2WO4 and AgBr. These materials show relatively high PEC water splitting efficiency using sunlight. Similarly, for the photodegradation of organic dyes Ta2O5 is used with the addition of Ag/AgCl nanoparticles (Ag/AgCl NPs), which results in an effective plasmonic photocatalyst for the removal of water-soluble Congo red (CR) dye compounds. For high-efficiency solar cells two methods are applied. Firstly, a FDTD simulation method was applied to study the plasmon enhancement of light absorption from p-i-n junction GaAs nanowires. Secondly a study of anisotropic deformation of colloidal particles exposed to heavy ions irradiation. Finally, a novel low-cost template-assisted method was used in order to improve the alignment of ZnO NRs grown on Si substrates. 

Abstract [sv]

Idag finns det ett ökat behov av olika energikällor. Den energikälla som i stor utsträckning används är fossilt bränsle, som till exempel kol, olja och gas. Emellertid finns det många kriser som associeras med denna energikälla. Därför är det bråttom att utveckla alternativa energikällor som är ekologiska och uthålliga. Förnybara energikällor som väte, vind, sol, biomassa och geotermisk energi är attraktiva. I denna avhandling demonstrerar vi två fotoprocesser som använder solenergi och är baserade på nanostrukturmaterial. Den första metoden som vi använder är fotokatalys: fotoelektrokemisk (PEC) vattensplittring för väteproduktion. Den andra metoden är fotodegradering av organiska färgämnen genom att använda solstrålning som inkommande energi. Dessutom undersöker vi hur nanotrådar kan användas som aktiva solceller.   

Avsikten med avhandlingen är att demonstrera optimiserade, billiga och uthålliga elektroder baserade på nanostrukturer för solenergitillämpningar. För PEC baserad vattensplittring använder vi två material, ZnO och CuO, som tillverkas med hjälp av hydrotermisk metoder följt av att vi deponerar olika material som Ag2WO4, och AgBr. Dessa material visar relativt hög effektivitet för PEC baserade användande av synligt solljus. För fotodegradering av organiska färgämnen användes Ta2O3 följt av deponering av Ag/AgCl nanopartiklar, som resulterar i effektiv plasmonisk fotokatalys för borttagande av det vattenlösliga Congo röda färgämnet. För högeffektiva solceller tillämpas två metoder först, en FDTD-simuleringsmetod användes för att studera plasmonförstärkningen av ljusabsorption från’’p-i-n junction’’ GaAs nanotrådar. För det andra en studie av anisotrop deformation av kolloidala partiklar under kraftig jonbestrålning. Slutligen användes en ny, billig mallassisterad metod för att förbättra anpassningen av ZnO NRs odlade på Si substrat.  

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2023. p. 68
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 2290
Keywords
Solar energy, Photocatalysis, Solar cells, Nanostructured materials, ZnO, CuO, Ta2O5, GaAs
National Category
Energy Systems
Identifiers
urn:nbn:se:liu:diva-191823 (URN)10.3384/9789180750561 (DOI)9789180750554 (ISBN)9789180750561 (ISBN)
Public defence
2023-03-15, TP1,Täppan, Campus Norrköping, Norrköping, 10:15 (English)
Opponent
Supervisors
Available from: 2023-02-17 Created: 2023-02-17 Last updated: 2024-01-08Bibliographically approved

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