This concise book delves into the innovative use of carrageenan in the green synthesis of metal oxide nanoparticle synthesis. It explores this emerging approach's mechanisms, highlighting its benefits over traditional syntheses. The unique properties imparted by carrageenan to metal oxide nanoparticles and how these enhance the material for various applications are also discussed. Furthermore, concerns regarding the scalability of this green synthesis are explored, particularly the challenges faced in large-scale production, reproducibility, economics, and environmental sustainability. Uniquely focuses on the carrageenan-mediated approach to metal oxide nanoparticle synthesis Details the mechanisms specific to metal oxide nanoparticle synthesis and the relevance of carrageenan in nanoparticle enhancement (through doping) Covers the scalability and reproducibility of this emerging approach to bridge research and industrial production This book serves as a primer for researchers and advanced students in materials science, chemistry, and chemical engineering to aid them in connecting their existing knowledge with the related peer-reviewed literature.