Luyen Quoc Vuong, Bui Van Dan, Nguyen Trong Nghia, Hoang Thi Hien, Chu Van Tuan*, Luyen Quoc Vuong, Hoang Thi Hien, Ho Truong Giang, Hoang Thi Hien, Tran Trung and Tran Thanh Binh 2021. Research on surface morphology of polyaniline film affecting NH₃ gas sensor efficiency at room temperature. Version B of Vietnam Journal of Science and Technology. 63, 3 (Mar. 2021). DOI:https://doi.org/10.31276/VJST.63(3).01-05.