engleski

Nanocellulose-QDs composites: Future in a foam

In recent years, there is a relentless pursuit for new types of materials that could replace the conventional examples. Quantum dots (QDs) are fluorescent semiconductors and have attracted much attention because of their wide span of application in nanophotonics, nonlinear optical devices, fluorescence probes, UV-protective materials, immobilization matrices in biosensors, etc. Achieving better material performance in many applications require combining QDs with other materials. For the purpose, the most abundant natural biopolymer ; cellulose might stand out. Here we browse through new ideas for creating QD- containing cellulose materials that repose on non- polluting and simple methods. Specifically, we aim to develop a method for preparing well-defined hybrid nanocellulose-QD foams with tuneable optical properties. In the bulk configuration, such nanocellulose-QDs foams display applicability for fluoroimmunoassay as well as for monitoring of drug delivery and wound healing.1 Synthetic procedures depend on the species of QD capping ligands and temperature in particular, as the key parameters for controlling the ligand dynamics. In this work, the prepared highly luminescent QDs- nanocellulose foams are characterised by UV-VIS, SEM, N2 A/D isotherms, XRD and contact angle measurements. XRD confirms composition ; broad amorphous cellulose signal is observed while several wide peaks are attributed to CdSe QDs. Moreover, microscopy and surface energy by contact angle measurements provided insight into connectivity and miscibility of QDs and cellulose. Obtained results enable improvements of the course of the QDs preparation. The desire is to gain control over the synthesis procedures necessary to prepare this composite in a thin-film configuration, which will be suitable for charge transfer layer application in solar cells.

CdSe quantum dots ; composite ; solar cells ; foam

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