Kimya Bölümü

Bu koleksiyon için kalıcı URI

http://hdl.handle.net/11527/25345

Gözat

Yazar "Aykut, Sümeyye" ile Kimya Bölümü'a göz atma
  • Öge
    Indium-based quantum dots trapped in solid-state matrices: a one-pot synthesis, thermoresponsive properties, and enhanced micropollutant removal
    (Royal Society of Chemistry, 2024) Ük, Nida ; Aykut, Sümeyye ; Jahangiri, Hadi ; Nar, Ilgın ; Ünlü, Caner ; https://orcid.org/0000-0001-6626-8665 ; https://orcid.org/0000-0001-7544-5360 ; https://orcid.org/0000-0003-2300-3071 ; https://orcid.org/0000-0002-0612-3111 ; Kimya Bölümü
    Indium-based quantum dots (QDs), such as copper indium disulfide and zinc copper indium sulfide, have been the center of research for decades due to their low toxicity and unique photophysical properties. In contrast, versatile indium-based materials like In2S3 and ZnIn2S4 have been rarely studied in their QD form because of the challenges in their synthesis and used in solid-state material based applications because of their colloidal nature. In this study, a one-pot single-step method to synthesize In2S3, ZnIn2S4, and Cu-doped ZnIn2S4 QDs trapped in insoluble solid-state oleic acid matrices was developed. The QDs in solid-state matrices exhibited bright orange colored fluorescence with controllable emission properties achieved by altering the chemical composition. Among these QDs, the ZnIn2S4 QDs displayed thermo-responsive properties. As the temperature increased, the fluorescence intensity of ZnIn2S4 QDs decreased. In addition, all QDs demonstrated high removal efficiency for micropollutants in the aqueous medium, especially against cationic organic dyes. This study represents one of the first attempts at the direct development of QDs trapped in insoluble solid-state matrices. The QDs in solid-state matrices hold promise for applications in thermal sensors and studies related to the micropollutant removal.
  • Öge
    Modulating spectral response of raw photosynthetic pigments via ternary cadmium chalcogenide quantum dots : simultaneous enhancement at green spectrum and inhibition at UV region
    (Springer, 2024) Aykut, Sümeyye ; Ük, Nida ; Coşkun, İbrahim Yağız ; Şahin Keskin, Sultan ; Nar, Ilgın ; Trabzon, Levent ; Ünlü, Caner ; 0000-0001-7544-5360 ; 0000-0001-6626-8665 ; 0000-0002-1666-7438 ; 0000-0001-6606-5622 ; 0000-0003-2300-3071 ; 0000-0002-7323-3943 ; 0000-0002-0612-3111 ; Kimya Bölümü
    Photosynthesis relies on the absorption of sunlight by photosynthetic pigments (PPs) such as chlorophylls and carotenoids. While these pigments are outstanding at harvesting light, their natural structure restricts their ability to harvest light at specific wavelengths. In this study, Oleic acid-capped CdSeS and CdTeS ternary quantum dots (QDs) were synthesized using a novel two-phase synthesis method. Then, these QDs were used to interact with raw PPs, a mixture of chlorophylls and carotenoids isolated from spinach. Our findings revealed the following: (1) Interacting QDs with raw PPs effectively inhibited the chlorophyll fluorescence of the pigments upon excitation in UV light region (250–400 nm) without causing any damage to their structure. (2) By forming an interaction with QDs, the chlorophyll fluorescence of raw PPs could be induced through excitation with green-light spectrum. (3) The composition of the QDs played a fundamental role in their interaction with PPs. Our study demonstrated that the photophysical properties of isolated PPs could be modified by using cadmium-based QDs by preserving the structure of the pigments themselves.