This book highlights an in-depth exploration of gold nanoparticles (AuNPs), emphasizing sustainable, "green" synthesis methods that address both scientific and environmental challenges. This comprehensive guide is designed for researchers, students, and professionals in nanotechnology, detailing the synthesis, characterization, and versatile applications of AuNPs across fields such as biomedicine, environmental science, agriculture, and industry. Key topics include innovative synthesis approaches, from chemical and physical to plant- and microorganism-based techniques, along with the advantages and challenges associated with eco-friendly production. The book also discusses the functionalization and customization of AuNPs to optimize their properties for specific applications, such as targeted therapies, pollutant removal, and biosensing. By promoting interdisciplinary approaches and standardized green protocols, this book aims to inspire further advancements in sustainable nanotechnology and offer impactful solutions for real-world challenges.

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Dr. Arnold C. Alguno is a professor in the Materials Science program at Mindanao State University-Iligan Institute of Technology (MSU-IIT), specializing in semiconductor physics, solar cell technology, and nanotechnology. He obtained his Ph.D. in Physics at Tohoku University, Japan. His research spans a broad range of fields, including sensor technology, quantum dots, and advanced functional materials. Dr. Rey Y. Capangpangan is a distinguished researcher and educator specializing in catalysis for environmental applications and the development of advanced nano-based catalysts. A faculty member at Mindanao State University at Naawan (MSUN), Philippines, he has led impactful projects on synthesizing and characterizing catalyst materials aimed at environmental remediation, pollution control, and sustainable energy solutions. His groundbreaking work in environmental catalysis addresses critical challenges in water and air pollution, establishing him as a leading voice in the field of environmental chemistry. His research integrates chemistry, materials science, and engineering, fostering interdisciplinary approaches to sustainable development.

Dr. Gerard Dumancas is a professor of Chemistry and associate dean of Research and Program Innovation at North Carolina Agricultural and Technical State University. He obtained his Ph.D. in Analytical Chemistry (Chemometrics) from Oklahoma State University. His research interests are in the areas of innovative bioenergy solutions. Dr. Arnold A. Lubguban is a distinguished professor and senior researcher at Mindanao State University-Iligan Institute of Technology (MSU-IIT) in the Philippines. With a Ph.D. in Chemical Engineering, his expertise lies in the development of petroleum-based and sustainable polymers, focusing on industrial, environmental, biomedical, and nanotechnology applications. Dr. Lubguban's research is dedicated to advancing renewable materials, with the goal of creating sustainable solutions for industrial and medical sectors. He obtained his Ph.D. from the University of Missouri.

Dr. Roberto M. Malaluan is a professor of Chemical Engineering at Mindanao State University-Iligan Institute of Technology (MSU-IIT) and a pioneering researcher in the field of sustainable polymers and supercritical fluid extraction. He completed his Doctor of Engineering at Tohoku University, Japan. Dr. Malaluan has dedicated his career to teaching and research, particularly focusing on the supercritical carbon dioxide extraction of natural products, a technique he has applied to drug discovery and industrial applications.

**Dr. Rolen Brian P. Rivera holds a Ph.D. Physics degree and he is a research fellow under the CHED-LAKAS-funded Colorimetric Project at Mindanao State University-Iligan Institute of Technology (MSU-IIT), Philippines. His work focuses on developing a colorimetric sensor for detecting food spoilage. He holds both BSc and MSc degrees in Physics from MSU-IIT, where he gained extensive expertise in synthesizing and characterizing metal nanoparticles for colorimetric applications. His research contributes to advancing accessible, rapid sensing technologies for food safety and quality control.