Fabrication of nano battery from CdS quantum dots and organic polymer

Efficient energy storage systems are recharged from the nano batteries; however, the available energy of present nanomaterial batteries remains capable for many applications due to the limited basic charging capacity of the electrode materials. A cadmium sulfide (CdS) nanocrystal (NCs) or quantum dots (QDs) that was prepared by chemical reaction and were fabricated nano battery device using the PVV / Li: graphite / CdS / Al. The optical properties of the CdS QDs were described by the spectrometers of ultraviolet-visible (UV-Vis.) and photoluminescence (PL), the results are indicating that the CdS QDs prepared where nanocrystalline structures are formed. The energy gap (Eg) of CdS QDs measured from PL was found to be about 2.69 eV. The CdS QDs led to improving the performs of the nano battery in terms of enhancing the mobility of the carrier's charging and consequently the processes of recombination between CdS QDs and Li-ions. The characteristics of the current-voltage (I-V) indicate acceptable conditions for the generation of light at (3 Volt). The structures can be designed to determine the fundamentals of ion and electron transport for energy storage in nanostructures and to test the limits of three-dimensional nano battery technologies. The nano battery device from semiconductor substance (CdS QDs) with (Li) has been successful in operating the nano battery with a few voltages giving a good current. Fabrication of CdS QDs and Li nano battery devices was involved in enhancing the efficiency of the nano battery devices.

Preparation of Quantum Dot-Embedded Photonic Crystal Hydrogel and Its Application as Fluorescence Sensor for the Detection of Nitrite

The development of fluorescence sensing platforms with excellent photoluminescence capabilities is of great importance for their further application. In this work, a photonic crystal structure was successfully applied to enhance the luminescence performance of fluorescent hydrogel, and the application of the obtained hydrogel as a fluorescence sensor was explored. A polystyrene photonic crystal template was constructed via vertical deposition self-assembly; then, the precursor solution containing polyethylenimine-capped CdS quantum dots (PEI-CdS QDs) and monomers filled in the gap of the template. After the polymerization process, the desired hydrogel was obtained. PEI-CdS QDs endowed the hydrogel with its fluorescence property, while interestingly, the photonic crystal structure showed a significant enhancement effect on the fluorescence-emission capability. The mechanism of this phenomenon was revealed. Moreover, this hydrogel could be used as a reusable fluorescence sensor for the detection of nitrite in water with good selectivity. The limit of detection was determined to be 0.25 μmol/L, which is much lower than the maximum limit for nitrite in drinking water.