**2.3. Preparation of polymer film with Tb3+ complex and Bi nanoparticles**

Polyvinyl alcohol was dissolved in double distilled water to attain its 0.011 mmol transparent homogeneous solution. From the already-prepared laser ablated Bi nanoparticles in water, 5 ml of colloidal NPs were mixed separately with ethanolic solution of the asprepared Tb(Sal)<sup>3</sup> (Phen) complex. The mixture was homogenized using a magnetic stirrer for 2 hours at room temperature and dispensed in aqueous solution of PVA. The resulting mixture was stirred thoroughly for 4–5 h and later poured in the polypropylene Petri dish and allowed to dry at its own without any heating agent to obtain the thin films. Flowchart depicting the steps for the preparation of polymer samples is shown in **Figure 5**.

Spectroscopic Investigations on Polyvinyl Alcohol Film with Complex of Terbium Ions along... http://dx.doi.org/10.5772/intechopen.70274 133

**Figure 5.** Flowchart depicting the steps for the preparation of polymer samples.
