Thienothiophene-based quantum dots: calibration of photophysical properties <i>via</i> carbon dot and biomolecular interactions
NANOSCALE, cilt.17, sa.22, ss.13756-13766, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 17 Sayı: 22
- Basım Tarihi: 2025
- Doi Numarası: 10.1039/d5nr00980d
- Dergi Adı: NANOSCALE
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC, MEDLINE
- Sayfa Sayıları: ss.13756-13766
- İstanbul Üniversitesi Adresli: Evet
Özet
Semiconductor-based quantum dots (QDs) are size-tunable, photostable and extremely effective fluorophores with strong bandgap luminescence, which make them attractive for biological and medical nano-applications. Herein, we present a thienothiophene (TT)-based highly conjugated fluorescent semiconductor containing triphenylamine (TPA) and tetraphenylethylene (TPE) units, TT-TPE-TPA, as a QD conjugate. As TT-TPE-TPA exhibits remarkable photophysical properties such as a maximum solid-state quantum yield of 47%, a maximum fluorescence solution quantum yield of 81%, a mega Stokes shift of 133 nm and a positive solvatochromism from blue to orange colors, its carbon-nitrogen (CN) and carbon-nitrogen-boron (CNB) dots were prepared. While the dots changed the emission characteristics of TT-TPE-TPA, depending on the enhanced conjugation and fluorescence properties of TT-TPE-TPA/CDs, tunable optical properties were achieved towards vital biomolecules such as urea, NH4Cl and sucrose. By systematically modulating the composition and concentration of TT-TPE-TPA, CDs, and biomolecules, the detailed mechanisms of energy transfer, fluorescence quenching, and radiation enhancement were revealed. This work opens the door to a new class of promising optical nanomaterials that could be controlled in TT-based QDs.