Preparation and Properties of Cyanobacteria-Based Carbon Quantum Dots/Polyvinyl Alcohol/ Nanocellulose Composite

Abstract

Blue luminescent carbon quantum dots (CQDs) were prepared from cyanobacteria by a hydrothermal method. The PL quantum yields of the obtained CQDs was 5.30%. Cyanobacteria-based carbon quantum dots/polyvinyl alcohol/nanocellulose composite films were prepared, which could emit bright blue under UV light. FTIR characterization showed that the composite films had hydroxyl groups on the surface and no new groups were formed after combining the three materials. The photoluminescence (PL) spectra revealed that the emission of the prepared CQDs was excitation dependent. Studies on the water resistance performance and light barrier properties of the composite films showed that they possessed higher water resistance properties and better UV/infrared light barrier properties. Therefore, we report the cyanobacteria-based carbon quantum dots/polyvinyl alcohol/nanocellulose composite films have the potential to be applied in flexible packaging materials, anti-fake materials, UV/infrared light barrier materials and so on.

Facile Synthesis of Surface-Modified Carbon Quantum Dots (CQDs) for Biosensing and Bioimaging

“…The optoelectronic properties of the QDs come from the transformation in size-dependent energy levels systematic transformations, which are correlated with the size of quantum dots [ 8 ]. Such a phenomenon is called the quantum confinement effect [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Quantum dots may be applied in bioimaging and biodiagnostics [ 16 , 17 , 18 , 19 ].…”

Revealing Molecular Mechanisms in Hierarchical Nanoporous Carbon via Nuclear Magnetic Resonance

“…5 , 6 Nanoporous carbons derived from biomass are particularly promising due to their cost-efficient scalable fabrication, sustainable sourcing, high surface area, and microporous dominated structure. [7][8][9] Typically, adsorption in such nanoporous carbon is determined by physical adsorption (via van der Waals forces) and, ultimately, by micropore filling and capillary condensation. 10 , 11 Mesopores play an criticalimportant role by providing transport channels for the adsorption and desorption of molecules as well as additional further adsorption sites.…”

Simple fabrication of gelatin–polyvinyl alcohol bilayer hydrogel with wound dressing and nonadhesive duality

“…Moreover, an FTIR microscope was used to visualize the functional group distribution across 0.75 mm of the bilayer cross‐section (Figure 4C,D). On the PVA side, peaks at 3300, 1145, and 842 cm −1 corresponding to the OH stretching, CC stretching, and bending of the polymer chain were present 33 . Meanwhile, characteristic protein bands at 3500, 3072, 1651, and 1537 cm −1 corresponding to amide A, B, I, and II groups were observed on the gelatin side 34 .…”