J. Sounder, N. Deepa, R. Aruna, and R. Ananthi. “Copper-Doped ZnO Gas Sensor Applications”. Recent Trends in Semiconductor and Sensor Technology (February 16, 2026): 15–23. Accessed April 16, 2026. https://matjournals.net/engineering/index.php/RTSST/article/view/3103.