Dr. Rohan Sagar is a Postdoctoral Researcher in the Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan. He received his Ph.D. in Physics from Dr. A.P.J. Abdul Kalam Technical University, India. He is currently serving as a reviewer for Springer Nature journals. Dr. Sagar holds one Indian patent on a CNT-GO-based ammonia gas sensor and has presented at multiple international conferences. With over 25 research publications, his expertise spans nanomaterials, polymer composites, and electrochemical sensors. He is a recipient of the UGC National Fellowship (JRF–SRF), India.