Time-resolved fluorescence and UV absorbance study on Elaeis guineensis/oil palm leaf based carbon nanoparticles doped in nematic liquid crystals

Abstract

Time resolved fluorescence measurement and UV absorbance study on oil palm leaf based nanoparticles (OPL) doped with nematic liquid crystal E 48 in 0.1, 0.2 and 0.3 wt/wt% concentration abbreviated as mixture 1 (MIX 1), mixture 2 (MIX 2) and mixture 3 (MIX 3) were conducted. OPL biomolecule loaded graphene oxide –nematic E 48 liquid crystal system has been fabricated for biosensor application. The interaction of OPL nanoparticles with E 48 nematic liquid crystal having different concentration of nanoparticles has been explored. Pure nematic E 48 and its doped system have been examined by time- resolved fluorescence spectroscopy (TRFS) technique. Variation in the nanoparticles concentration strappingly affects the fluorescence emissions. Lack of Förster resonance energy transfer (FRET) was found in all composites. This manuscript unveils the purpose of a range of factors, such as dipolar interface between donor and acceptor molecules, nanoparticles orientation and its proximity distance that may be accountable for the non-appearance of FRET. Nematic nanoparticles doped system forms an antique composition of luminescent material even though the fluorescence characteristics of host are customized in the existence of nanoparticles by the molecular alignment modification. Variation in lifetimes of nematic nanoparticles doped system has been observed. These results find its applicability in photonic displays, photovoltaic devices, biosensors etc. © 2020