The role of copper decorating poly(1,8-diaminonaphthalene)/graphene electrodes as a catalyst in the determination of nitrite

Bui Thi Hong Van, Do Thi Thuy, Nguyen Le Huy, Nguyen Thi Tuyet Mai, Tran Dai Lam, Nguyen Tuan Dung
Author affiliations


  • Bui Thi Hong Van School of Chemical Engineering, Hanoi University of Science and Technology, 19 Le Thanh Tong Streets, Hai Ba Trung District, Ha Noi, Viet Nam
  • Do Thi Thuy Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Streets, Cau Giay District, Ha Noi, Viet Nam
  • Nguyen Le Huy Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Streets, Cau Giay District, Ha Noi, Viet Nam
  • Nguyen Thi Tuyet Mai School of Chemical Engineering, Hanoi University of Science and Technology, 19 Le Thanh Tong Streets, Hai Ba Trung District, Ha Noi, Viet Nam
  • Tran Dai Lam Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Streets, Cau Giay District, Ha Noi, Viet Nam
  • Nguyen Tuan Dung Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Cau Giay District, Ha Noi, Viet Nam



poly(1,8-diaminonaphthalene)/graphene, nitrite, sensor, copper mine, Ca-based catalysts


. Electroactive poly(1,8-diaminonaphthalene) is known to have a high affinity for metal ions thanks to amine and imine groups in the polymer chain. However, electrochemical sensors based on pristine P(1,8-DAN) have a major drawback concerning its poor electrical conductivity. To solve this problem, recently P(1,8-DAN) has been modified with some advanced nanomaterials such as carbonaceous materials or different metallic elements. In this research, we reported the synthesis and electrochemical characterization of a poly(1,8-diaminonaphthalene)/graphene composite film capable of adsorbing Cu2+ ions towards the application of nitrite sensing. P(1,8-DAN) was directly electropolymerized on graphene-coated glassy carbon electrode by a potential cycling between –0.15 and +0.95 V (vs. SCE) at a scan rate of 0.05 V/s, in aqueous solution  containing 1.0 M HClO4 and 1.0 mM monomer 1,8-DAN,. The adsorption of Cu2+ ions onto the P(1,8-DAN) thin film was caried out in 0.1 M Cu(NO3)2 solution at 80 oC, followed by electrochemically redution to metal Cu0 by applying -0.4 V. The obtained copper decorating poly(1,8-diaminonaphthalene)/graphene (Gr/P(1,8-DAN)-Cu) electrodes acted as a catalyst in the enhancement of electrochemical signal for the determination of nitrite. The linear voltammetric response to the nitrite concentration was observed by a square wave voltammetric technique in the range of 0.69 to 1.12 mM with a detection limit of 0.13 mM. The results open up the path for designing other nitrite sensing based on our novel approach.


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How to Cite

B. T. Hong Van, D. T. Thuy, N. L. Huy, N. T. T. Mai, T. D. Lam, and N. T. Dung, “The role of copper decorating poly(1,8-diaminonaphthalene)/graphene electrodes as a catalyst in the determination of nitrite”, Vietnam J. Sci. Technol., vol. 60, no. 6, pp. 1056–1066, Dec. 2022.




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