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Two-dimensional fillers are the materials with two dimensions less than 100 nm, and they are mostly in the form of rods [14]. The typical two-dimensional nanomaterials are carbon nanofibers (CNFs), carbon nanotubes (CNTs), halloysite nanotubes (HNTs), nickel nanostrands (NiN_S), and aluminum oxide nanofibers (Nafen). In addition, the most common two-dimensional nanofillers in PNCs are nanotubes [34], plant fibers [35–39], nanowires [40], carbon fibers [41–44], oxides [45–55], graphene [56, 57], molybdenum disulfide (MoS₂) [58], and hexagon boron nitride (h-BN) [59]. Compared with one- and three-dimensional fillers, two-dimensional fillers have better flame retardancy and striped characteristic, resulting in wide applications in the fields of catalysis, electronics, optics, sensing, and energy [3, 26, 60–62].