Carbon quantum dots (CQDs) is the new type of quantum dots (QDs) or nanoparticles with passivated surface having zero dimensions with size less than 10 nm. The main focus of this review paper is to emphasize on the utilizations and applications which CQDs possess due to their magnificent properties including high thermal stability, good conductivity, strong photoluminescence, biocompatibility, high crystallization, non-toxicity and many more. The readers will come to know about the following applications in this outlook. Strong photoluminescence of CQDs which further helps in multicolor bioimaging and detections. The application of heteroatom doped CQDs as a chemical and biosensor for sensing NO2 gas, to detect heavy metal atoms present like iron, lead and for spermine detection. The hybrid of Bi2O3 - CQDs for lithium-ion battery as this hybrid greatly increases efficiency and storage capacity. F and Cl doped CQDs show suitable anti-oxidant and pro-oxidant activity to use them for bioimaging. Mushroom derived CQDs for fighting against breast cancer cells and bacteria like Klebsilla pneumonia. N doped CQDs for photochemotherapy as it is best suited for enhancing diagnostic, therapeutic and fluorescence imaging property. Also, the types of challenges and difficulties faced in the research of nanoparticles before the development of CQDs are examined in this present work. Nanoparticle is the area where a lot of research has been done and there are many more to come in future specially for CQDs because due to its excellent properties, the attention of the hosts has been attracted towards it.
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