Screen-printed Microsensors Using Polyoctyl-thiophene (POT) Conducting Polymer As Solid Transducer for Ultratrace Determination of Azides

Molecules

Ayman H. Kamel¹  Ahmed Galal Eldin²  Saad S. M. Hassan²  AbdEl-Galil E. Amr³ 

[1] Development Chair (DEDC), College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;Chemistry Department, Faculty of Science, Ain Shams University, 11566 Abbasia, Cairo, Egypt;;Pharmaceutical Chemistry Department, Drug Exploration &

关键词: azides;    screen-printed sensors;    poly (3-octylthiophene);    solid contact potentiometric sensors;    iron-phthalocyanine;    nitron-azide complexes;   

DOI  :  10.3390/molecules24071392

来源: DOAJ

【 摘 要 】

Two novel all-solid-state potentiometric sensors for the determination of azide ion are prepared and described here for the first time. The sensors are based on the use of iron II-phthalocyanine (Fe-PC) neutral carrier complex and nitron-azide ion-pair complex (Nit-N₃⁻) as active recognition selective receptors, tetradodecylammonium tetrakis(4-chlorophenyl) borate (ETH 500) as lipophilic cationic additives and poly(octylthiophene) (POT) as the solid contact material on carbon screen-printed devices made from a ceramic substrate. The solid-contact material (POT) is placed on a carbon substrate (2 mm diameter) by drop-casting, followed, after drying, by coating with a plasticized PVC membrane containing the recognition sensing complexes. Over the pH range 6-9, the sensors display fast (< 10 s), linear potentiometric response for 1.0 × 10⁻²–1.0 × 10⁻⁷ M azide with low detection limit of 1.0 × 10⁻⁷ and 7.7 × 10⁻⁸ M (i.e., 6.2–4.8 ng/ml) for Fe-PC/POT/and Nit-N₃⁻/POT based sensors, respectively. The high potential stability and sensitivity of the proposed sensors are confirmed by electrochemical impedance spectroscopy (EIS) and constant-current chronopotentiometry measurement techniques. Strong membrane adhesion and absence of delamination of the membrane, due to possible formation of a water film between the recognition membranes and the electron conductor are also verified. The proposed sensors are successfully applied for azide quantification in synthetic primer mixture samples. Advantages offered by these sensors are the robustness, ease of fabrication, simple operation, stable potential response, high selectivity, good sensitivity and low cost.

【 授权许可】

Unknown