**Preface to "Nanostructured Materials based on Noble Metals for Advanced Biological Applications"**

This book is my positive answer to a call I received from *Nanomaterials*. In my opinion the topic "Nanostructured Materials Based on Noble Metals for Advanced Biological Applications" is a hotspot of the international and interdisciplinary research between several emerging and advanced applications fields, such as nanosensors and nanomedicine. It is nowadays generally accepted that nanostructured noble metals allow the production of highly competitive materials. In fact, a specific design and rather simple and reliable preparation techniques can be used to obtain optimized material uses and possibilities for their reusability. One expects amazing future developments for these nanotechnologies from research laboratories to key industrial areas. I consequently accepted, with pleasure, the invitation to serve as Guest Editor for this Special Issue, that presents some advanced methods of gold and silver nanomaterials preparation/synthesis as well as their innovative applications. The book opens with an editorial that presents the various works and their common thread. The first contribution is a review broadly based on metallic nanoparticles in the biological field followed by more specific works on gold nanoparticles to be used in various advanced applications, such as theragnostics. Following is a study on the current state-of-the-art on the use of silver nanoparticles in nanomedicine. At the end of this collection of research, we find silver nanoparticles used to develop applications in the environmental and biotechnology fields. The resulting volume proved to be international, with authors from several countries (France, Germany, Korea, Israel, Italy, Romania, Spain). All contributions represent works from prominent universities and research centers all over the world. I, as Guest Editor, and the MDPI staff are pleased to offer this Special Issue to all interested readers to the wide world of nanomaterials.

> **Iole Venditti** *Special Issue Editor*
