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Zero‐dimensional NMs are defined as materials where all the three dimensions are confined to the nanoscale (1–100 nm). The same definition could also be stated on basis of the movement of electrons along the dimensions of the NMs. Zero‐dimensional materials are materials where the electrons are merely entrapped in a dimensionless space without any possible movement (Jeevanandam et al., 2018). The best examples for 0D NMs are NPs and quantum dots. Over the past decades, 0D materials have gained a lot of interest where a number of methods have been designed to fabricate 0D NMs with precise dimensions. 0D NMs can be crystalline or amorphous in nature. They may be mono‐ or polycrystalline, single‐ or multi‐element, and may exist in various forms (shapes and sizes). These materials have found application in a number of fields such as solar cells (Lee et al., 2009), light‐emitting diodes (Stouwdam & Janssen, 2008), single‐electron transistors (Mokerov et al., 2001), lasers, therapeutics and diagnosis (Azzazy, Mansour, & Kazmierczak, 2007).