Single-Walled Carbon Nanotubes Functionalized with N-(6-aminohexyl) Carboxamide as Ionophore for Sensing Silver Ions

• Published in: Journal of analytical chemistry (New York, N.Y.) Vol. 73; no. 4; pp. 383 - 389
• Main Authors: Mehdizadeh, K., Giahi, M., Aghaie, H.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.04.2018; Springer; Springer Nature B.V
• Subjects: Amides; Analytical Chemistry; Chemistry; Chemistry and Materials Science; Electrodes; Ion concentration; Ionophores; Ions; Mathematical analysis; Nanotubes; Production processes; Response time; Single wall carbon nanotubes; N-(6-aminohexyl) carboxamide; sensor; carbon nanotubes; thermal coefficient; silver ion-selective
• ISSN: 1061-9348; 1608-3199
• DOI: 10.1134/S1061934818040093

In this work; we constructed a silver ion-selective electrode based on N-(6-aminohexyl) carboxamide functionalized single-walled carbon nanotubes ( NAHAFSWCN ) as an ionophore. The selectivity constant of a number of cations was measured using silver ion selective electrode. Optimal pH was between 3 and 6 and the upper and lower detection limits of the designed electrode were 1.2 × 10 –2 and 8 × 10 –7 M. The electrode showed a Nernstian response over a silver ion concentration range of 1 × 10 –6 to 1 × 10 –2 M with a slope of 59.1 ± 0.5 mV/decade. The response time of the electrode was less than 18 s and its effective lifetime was 3 months. The isothermal temperature coefficient of the electrode d E °/d T was determined as 0.00011 V/grad. Thermodynamic functions such as Δ S °, Δ H ° and Δ G ° were obtained by calculating the thermal coefficient of the electrode.