Integrated fiber-based optoelectrode for electrochemiluminescence sensing

• Published in: Optics communications 2022-04, Vol.508, p.127633, Article 127633
• Main Authors: Teng, Pingping, Li, Zhanao, Liu, Zhihai, Zhang, Jianzhong, Copner, Nigel, Yang, Jun, Li, Kang, Bowkett, Mark, Gao, Danheng, Yuan, Libo
• Format: Article
• Language: English
• Subjects: Electrochemiluminescence; Integrated optical fiber; ITO; Optoelectrode
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2021.127633

An optical fiber-indium tin oxide (ITO) optoelectrode was proposed and first demonstrated in electrochemical luminescence (ECL) analyze. A transparent conductive ITO film was coated onto the surface of a bare optical fiber by magnetron sputtering. The optical fiber was realized as a working electrode and a detection device at the same time. Notably, the photoelectric analysis is integrated into the optical fiber electrode, providing more information about the analyte while greatly simplifying the device. The modulation of the ECL response intensity is monitored in real-time by applying different voltages to the fiber optic electrode with a response time of 2 s. In aqueous solutions, trace amount of H2O2 can be detected in real-time by the optical fiber ECL system. A wide detection range of 1 × 10−5 M to 1 × 10−2 M is obtained. Especially, the optical fiber-ITO electrode has great potentials in environmental analysis and bioassay. •An optical fiber-indium tin oxide photoelectrode was proposed and first applied in electrochemical luminescence analyze.•The photoelectric analysis is integrated into the optical fiber providing information about the analyte while greatly simplifying the device.•The ECL optical and electrical signals can be synchronized and applied to the detection of low concentrations of hydrogen peroxide in aqueous solutions.•The integrated miniature optoelectrode is expected to be used for environmental and biological detection.