Thema der Dissertation:
Controlled Charge Transfer in Single Walled Carbon Nanotubes using Organic Molecules via Nondestructive Covalent Pre-Functionalization
Controlled Charge Transfer in Single Walled Carbon Nanotubes using Organic Molecules via Nondestructive Covalent Pre-Functionalization
Abstract: This thesis presents a novel pre-functionalization strategy for covalently functionalizing SWCNTs, enabling precise control over their optoelectronic properties. By designing triazine derivatives with predefined substituents, successful grafting ensured the presence and number of desired chemical species, referred to as charge transfer agents (CTAs). These CTAs, with varying substituents, were synthesized and covalently attached to SWCNTs without disrupting their sp² network, allowing controlled Fermi level shifts, as observed through Raman, XPS, and fluorescence analysis. Similarly, a novel triazine-spiropyran complex was synthesized and structurally confirmed via single-crystal XRD and UV absorption studies, demonstrating strong optical response changes upon isomerization. Covalent attachment of this complex onto SWCNTs preserved the sp² network integrity, as evidenced by Raman spectroscopy. UV activation induced a reversible ~50% fluorescence quenching effect, highlighting tunable electronic properties. These findings are a contribution for developing SWCNT-based photonic devices with precisely controlled optoelectronic functionality.
Time & Location
Apr 11, 2025 | 03:00 PM
Hörsaal A (1.3.14)
(Fachbereich Physik, Arnimallee 14, 14195 Berlin)