3.3.2. XRD Analysis

The crystalline structure of Ag-NPs incorporated in *C. pentandra* fiber can be determined using XRD analysis. The XRD pattern of treated *C. pentandra* fiber and *C. pentandra*/Ag-NPs is shown in Figure 8. The peak at 15.89◦, 22.70◦ and 34.95◦ are corresponding to the amorphous peaks of treated *C. pentandra* fiber as shown in Figure 8a. However, the five diffraction peaks of *C. pentandra*/Ag-NPs appeared at 38.48◦, 43.44◦, 64.76◦, 77.74◦ and 81.76◦ of 2θ value corresponding to (111), (200), (220), (311) and (222) of indexed of FCC plane of Ag, respectively as shown in Figure 8b. This crystallographic plane is based on ICDD/ICSD X'Pert High Score Plus (Ref. No. 01-087-0719). These peaks show the crystalline structure of Ag-NPs in *C. pentandra* fiber.

**Figure 8.** X-ray Diffraction (XRD) patterns of (**a**) treated *C. pentandra* fiber and (**b**) Ag-NPs in *C. pentandra* fiber.
