Abstract
Quantum dots (QDs) usually refer to very small nanoparticles of only few nanometers in size. The optical and electronic properties of QDs differ from those of larger particles. QDs will emit light of specific frequencies if electricity or light is applied to them, and these frequencies can be precisely tuned by changing the dots’ size, shape, and material, giving rise to many applications. In this chapter, apart from the most common QDs, e.g., the cadmium (Cd)-containing semiconductor QDs, other types of QDs, including silver chalcogenide quantum dots, carbon quantum dots, silicon quantum dots, black phosphorus quantum dots, germanium quantum dots, and polymer dots are also introduced with an emphasis on their cancer therapy and imaging applications.
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