Nanoparticles have a wide range of uses in today's world, including medicinal, optical, and electronic disciplines, and so have a burgeoning research field (Bamrungsap et al., 2012). The development of simple, faster, economically and environmentally acceptable nanoparticle synthesis is more highly significant in the field of nanotechnology. Additionally, the production of nanoparticles of various size and shapes has a crucial implication by improvising the experimental techniques (Chen et al., 2003). The properties of many conventional materials change when formed from nanoparticles. Organic compounds including stabilisers, capping, surface ligands, or passivating agents are used to coat inorganic nanoparticles throughout the biosynthesis process (Heuer-Jungemann et al., 2019). In the present study, Coleus amboinicus leaf extract was employed to make Caesium carbonate (Cs2CO3) nanoparticles, which works as a stabilising or capping agent. This approach is termed as Green synthesis method (Ismail et al., 2016). Green synthesis cuts down on the number of chemicals use(Yadi et al., 2018). In comparison to chemical or micro-mediated synthesis, it is simple, efficient, and environmentally benign, with a short processing time (Sivakumar, 2021). As a result, green synthesis is the ideal option for making nanoparticles. Coleus amboinicus is an excellent stabilising and capping agent (Narayanan & Sakthivel, 2010).
Coleus amboinicus is a semi-succulent perennial plant native to Southern and Eastern Africa belongs to the Lamiaceae family (Dathar, 2019). Its smell and flavours are most similar to oregano. It's widely grown and neutralised across the tropics, where it's used as a traditional medicine. They offer a wide range of therapeutic qualities. Glucosides of luteolin and apigenin are being derived from the leaves. They also contain antibacterial, antifungal and antimicrobial properties (Sathyan et al., 2018; Winter et al., 2020).
Caesium carbonate is an alkali metal with an alternate high surface area in the form of nanoscale elemental powder and suspensions of caesium carbonate. In the process of organic synthesis, they serve as a starting point. It is a crystalline compound with a greater solubility in polar solvents including water, alcohol and DMF and even more increased solubility in organic solvents(Elayaraja & Karunakaran, 2012; Yadi et al., 2018). A caesium source that is insoluble in water can be quickly transformed to other caesium compounds. When dilute acids are used to treat carbonate compounds, CO2 is released. In most cases, Cs2Co3 is instantly available in most amounts(Lei et al., 2019). Hence, the current study was attempted to synthesis and analyse caesium carbonate nanoparticles utilising Coleus amboinicus.