RT journal article
T1 Fast, Economic, and Improved Nanostructured Polymeric pH Sensor for Agrifood Analysis
A1 Sainz Calvo, Álvaro Jesús
A1 Sierra Padilla, Alfonso
A1 Bellido Milla, Dolores
A1 Cubillana Aguilera, Laura
A1 García Guzmán, Juan José
A1 Palacios Santander, José María
A2 Química Analítica
K1 agrifood monitoring
K1 continuous flow
K1 PANI
K1 PEDOT:PSS
K1 pH sensor
K1 sinusoidal voltages
K1 sonogel–carbon
AB In the present work, a novel and economical pH sensor has been improved through the application of the conducting polymers poly(3,4-ethylendioxythiphene) and poly(sodium 4-styrene sulphonate). Sinusoidal voltages were applied to electrodeposit the different polymers studied for different periods (10, 15, and 20 min) on the electrode surface. The presence of polyaniline and its reversible redox structure have been corroborated by cyclic voltammetry. The working range has been increased from 3–8 to 2–12, obtaining adequate sensibility and linearity. This new sensor presented satisfactory repeatability, reproducibility (RSD < 5%), AND reversibility (pH range 2–12), and excellent selectivity towards H+ in the presence of diverse interferents in agrifood samples. Finally, the sensor was used to measure the pH in several real samples, whose pH values ranged from 2.23 to 11.5, obtaining excellent results. In addition, the values found were very similar to those reported by the gold technique (pH meter), with an error of less than 10% for most of the samples analyzed. In addition, a preliminary survey about measurements in a continuous flow, using a 3D homemade microfluidic cell, was performed with promising results.
PB Multidisciplinary Digital Publishing Institute (MDPI)
SN 2227-9040
YR 2025
FD 2025
LK http://hdl.handle.net/10498/36347
UL http://hdl.handle.net/10498/36347
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 09-nov-2026