Carbon-based thick films for electrochemical detection of neonicotinoid insecticides

Repič, Barbara (avtor), Marolt, Gregor (avtor), Kuščer, Danjela (avtor)

Neonicotinoids (NNIs) are water-soluble, toxic, widespread-used systemic insecticides commonly found in the environment. Integrated electrochemical sensors enable the rapid on-site detection of NNIs in aqueous samples by analysing the reduction of the NNI's nitro functional group on the working electrode. We have investigated graphite (G), glassy carbon (GC) and carbon black (CB) thick films as working electrodes for the electrochemical detection of the NNI imidacloprid (IMD). Up to 35-μm-thick films of G, GC and CB on alumina were prepared by screen printing and subsequent firing at 850 °C in argon. G had the largest grain size, the roughest surface, and the lowest sheet resistance of 6.9 Ω/sq. GC and CB had a smoother surface, while their sheet resistances were up to 27 Ω/sq. All three films showed a reversible response to the Fe(CN)$_6^3$$^{−/4−}$ redox probe with G having the highest electrochemically active surface area and the highest heterogeneous electron transfer rate constant. In the IMD solution with neutral pH, G, GC and CB exhibited characteristic reduction peak at −1.1 V and a re-oxidation peak at +0.2 V. An additional adsorption cathodic peak was observed with CB, indicating a significantly higher affinity of CB for IMD adsorption. With LODs under 1 μM, the G, GC and CB pristine thick films exhibiting great potential for the sensitive detection of IMD.

• Jezik: Angleški jezik
• Ključne besede: graphite thick films, glassy carbon thick films, carbon black thick films, screen-printed electrodes, electrochemistry, neonicotinoids
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 12 str.
• Številčenje: Vol. 984, art. 119054
• PID: 20.500.12556/RUL-167812
• UDK: 632
• ISSN pri članku: 1572-6657
• DOI: 10.1016/j.jelechem.2025.119054
• COBISS.SI-ID: 227536387
• Datum objave v RUL: 13.03.2025

Gradivo je del revije

• Naslov: Journal of electroanalytical chemistry
• Založnik: Elsevier
• ISSN: 1572-6657
• COBISS.SI-ID: 516046873

Licence

• Licenca: CC BY-NC 4.0, Creative Commons Priznanje avtorstva-Nekomercialno 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc/4.0/deed.sl
• Opis: Licenca Creative Commons, ki prepoveduje komercialno uporabo, vendar uporabniki ne rabijo upravljati materialnih avtorskih pravic na izpeljanih delih z enako licenco.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: insekticidi, neonikotinoidi, ogljik