Ultrasonic spray pyrolyzed Cr-doped NiO for non-enzymatic photoelectrochemical dopamine sensing

ACAR M., Özkahraman E. E., İSKENDEROĞLU D., GÜNEY H.

Physica B: Condensed Matter, cilt.728, 2026 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 728
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1016/j.physb.2026.418385
  • Dergi Adı: Physica B: Condensed Matter
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC
  • Anahtar Kelimeler: Cr-doped NiO, Dopamine detection, Non-enzymatic PEC sensor, Ultrasonic spray pyrolysis
  • Atatürk Üniversitesi Adresli: Evet

Özet

This study presents a non-enzymatic photoelectrochemical (PEC) dopamine (DA) sensor based on chromium-doped nickel oxide (Cr:NiO) thin films synthesized via ultrasonic spray pyrolysis (USP), offering a simple, low-cost, and scalable fabrication route. Cr doping enhances the PEC response to DA by improving interfacial charge-transfer behavior, as supported by electrochemical characterization (CV and chronoamperometry, EIS). The developed sensor exhibits a broad linear detection range from 0.001 mM to 2 mM with a low detection limit of 1 nM. Among all samples, the 4% Cr:NiO electrode provides the highest sensitivity and selectivity toward DA compared with pristine NiO and lower doping levels. USP-prepared Cr:NiO is a favourable earth-abundant photoactive platform for non-enzymatic dopamine sensing. This provides a feasible and materials-engineering-relevant method to utilize dopant-induced defect modulation for the development of advanced PEC sensing techniques.