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We introduce novel ultra-sensitive tunable optical nanosensors based on conceptually new physical phenomena and techniques. The core foundation of these sensors is based on molecular-like behavior of hybrid systems consisting of metallic nanoparticles and semiconductor quantum dots when they interact with a laser field (activating field). Therefore, instead of using plasmons or excitons as in conventional...
Quantum dots (QDs) nanoparticles are increasingly being used for biomedical applications. Most QDs consist of heavy metal which may be potentially toxic to biological organisms. In this study, CdTe/ZnS core/shell QDs were evaluated for their harmful effects on Escherichia coli, which served as model for potential impact to microorganisms and microbial cell toxicity. Organic soluble CdTe and CdTe/ZnS...
Physically flexible, solution-processed solar cells have the potential to harvest light conveniently, cheaply and efficiently. Absorption of the considerable power in the infrared region of the solar spectrum is necessary for efficient solution-processed solar cells. We use lead sulphide (PbS) colloidal nanoparticles (quantum dots) that are quantum size effect tunable, allowing tailoring of absorption...
When conjugated to CdSe/ZnS nanocrystals (quantum dots), the nucleobase adenine and the neurotransmitter dopamine quench fluorescence emission from in a manner strongly dependent upon the size of the quantum dot. The degree of quenching serves to predict the efficiency with which the conjugates are able to enter living cells. Along with quenching, the presence of specific receptors on the cells is...
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