**Preface to "Advanced Polymer Nanocomposites II"**

Polymer nanocomposites are currently of high industrial interest in the field of nanomaterials due to fact that they can improve the performance of polymeric matrixes and inorganic nanomaterials. They can be used to alter light/magnetic behaviors, electrical/thermal conductivity, toughness, stiffness and mechanical strength. The inorganic quantum dots/nanoparticles, nanorods/nanotubes, and 2D materials (such as graphene-based nanosheets) can be decorated in a polymer matrix through chemical synthesis or physical blending to improve its performance. Thus, how to fabricate a homogeneous dispersion of fillers in the polymer matrix has been a most crucial area of research in the nanomaterials field. This Special Issue reprint, "Advanced Polymer Nanocomposites II", collects high-quality original and review papers, focused on the scientific discussion and practical application in the field of functional polymer nanocomposites, including: (a) optoelectronic materials (papers 1-9); (b) biomedical materials (papers 10-14); and (c) other functional polymer nanocomposites (papers 15-23). We hope that this Special Issue reprint can promote academic research exchanges and identify and respond to tremendous challenges of research in this burgeoning field.

> **Ting-Yu Liu and Yu-Wei Cheng** *Editors*
