Abstract
Quantum dot (QD), a unique nanosized semiconductor material, has secured an enduring position as a promising nanosensor in today's industry for its various application areas. The control of particle sizes allows the bandgap of the QDs to be “tuned” to give desired electronic and optical properties such as broad excitation spectra and tunable emission spectra with a narrow bandwidth, which make them very special for various optical research and applications. The biggest societal problem now is water pollution due to water-dissolved hazardous metal ions (Cu2+, Zn2+, Co2+, Pb2, and Cr3+) from industrial wastages. QDs have justified themselves as selective nanosensors for the sensitive detection of metal ions. QDs are used as medical imaging tools for diseased cells like cancerous tumors, etc. due to their strong affinity toward a polar environment. This chapter covers the description of sensing and medical imaging applications of QDs for biomedical and sensing industries including some advances in this field.
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