Nguyen Van Huynh, Pham Van Hai, Duong Thi Thu Hang, Bui Ha Trung, Chu Van Tuan, Tran Trung, Do Thi Anh Thu, and Ho Truong Giang. 2018. “DEVELOPMENT OF NH 3 GAS SENSOR OPERATING AT ROOM TEMPERATURE BASED ON POLYPYRROLE NANO FILMS”. UTEHY Journal of Applied Science and Technology 18 (July), 30-33. http://jst.utehy.edu.vn/index.php/jst/article/view/106.