Colloidal nanocrystals are tiny particles, typically ranging from 1 to 100 nanometers in size, suspended in a liquid medium. These nanocrystals can be made from various materials, including metals, semiconductors, and insulators. Their small size gives them unique optical, electronic, and chemical properties, making them useful in applications like solar cells, LEDs, and biomedical imaging. The synthesis of colloidal nanocrystals often involves chemical methods that allow for precise control over their size and shape. This control is crucial because the properties of nanocrystals can vary significantly based on their dimensions and surface characteristics. Researchers continue to explore new techniques to enhance the performance of these materials in various fields.