Comparative study of NiO-ZnO/PANI-CNTs and NiO-ZnO/PANI-graphene nanocomposites for fabrication of aqueous methanol sensors

Pham Thi Nam; Nguyen Thi Thom; Vo Thi Kieu Anh; Nguyen Thi Thu Trang; Nguyen Thi Kim Ngan; Huynh Le Thanh Nguyen; Nguyen Thai Hoang; Pham Van Viet; Nguyen Van-Anh; Le Viet Hai; Tran Dai Lam

doi:10.15625/2525-2518/19390

Author affiliations

Authors

Pham Thi Nam \(^1\) Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0002-7242-6006
Nguyen Thi Thom \(^1\) Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam
Vo Thi Kieu Anh \(^1\) Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0003-1273-635X
Nguyen Thi Thu Trang \(^1\) Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam
Nguyen Thi Kim Ngan \(^2\) University of Science-VNUHCM, 227 Nguyen Van Cu, Cho Quan Ward, Ho Chi Minh City, Viet Nam https://orcid.org/0009-0005-5765-5053
Huynh Le Thanh Nguyen \(^2\) University of Science-VNUHCM, 227 Nguyen Van Cu, Cho Quan Ward, Ho Chi Minh City, Viet Nam https://orcid.org/0000-0003-4806-7362
Nguyen Thai Hoang \(^2\) University of Science-VNUHCM, 227 Nguyen Van Cu, Cho Quan Ward, Ho Chi Minh City, Viet Nam https://orcid.org/0000-0002-3003-8996
Pham Van Viet \(^3\) Ho Chi Minh City University of Technology (HUTECH), 475A Dien Bien Phu Street, Thach My Tay Ward, Ho Chi Minh City, Viet Nam
Nguyen Van-Anh \(^4\) School of Chemistry and Life Science, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Bach Mai Ward, Ha Noi, Viet Nam https://orcid.org/0000-0002-2893-0352
Le Viet Hai \(^2\) University of Science-VNUHCM, 227 Nguyen Van Cu, Cho Quan Ward, Ho Chi Minh City, Viet Nam
Tran Dai Lam \(^1\) Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0003-1364-8001

DOI:

https://doi.org/10.15625/2525-2518/19390

Keywords:

polyaniline, n-p heterojunction, nickel oxide, zinc oxide, electrochemical methanol sensor

Abstract

In this study, we fabricated and compared two composite interfaces, ZnO-NiO/PANI-CNTs (TNZ) and ZnO-NiO/PANI-Gr (GNZ), for electrochemical detection of methanol in aqueous media. The composite were examined by XPS, SEM, TEM, SAED, and electrochemical techniques, including cyclic voltammetry (CV) and chronoamperometry (CA). Both composites contained NiO/NiOOH-ZnO active species distributed on conductive PANI-carbon networks and were able to catalyze methanol oxidation in alkaline solution. In the presence of 100 mM methanol, TNZ produced a higher voltammetric response than GNZ, indicating more effective charge transfer through the CNT-containing PANI framework. The Ni(II)/Ni(III) redox process appeared at approximately 0.45 and 0.30 V (vs. Ag/AgCl). Chronoamperometric measurements showed a response time of about 5 s and two linear concentration ranges of 0 - 300 and 300 - 600 ppm. For the higher range, the calibration gave R² = 0.932. The response was also clearly observed in RON 92 gasoline samples containing methanol. The results demonstrate that both electrodes are applicable to methanol detection, with TNZ showing the better overall electrochemical response.

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