Pedot: PSS–modified platinum microelectrodes for measurements in aqueous media: Effect of polymer surface area on long-term anodic peak current stability

• Main Authors: Benoudjit, Abdel Mohsen, Abdul Guthoos, Habibah Farhana, Arris, Farrah Aida, Wan Salim, Wan Wardatul Amani
• Format: Article
• Language: English; English; English
• Published: Kulliyah of Engineering, International Islamic University Malaysia (IIUM) 2017
• Subjects: TA164 Bioengineering; TA170 Environmental engineering; TP248.13 Biotechnology
• Online Access: http://irep.iium.edu.my/59635/1/715%20Mohsen%20Amani%20et%20al.pdf; http://irep.iium.edu.my/59635/2/AMB%20HFAG%20FAA%20WWAWScoraut%20article%20IIUMEJ%20Accepted.pdf; http://irep.iium.edu.my/59635/13/PEDOT%20PSS-Modified%20platinum%20microelectrodes%20for%20measurements%20in%20aqueous%20media%20Effect%20of%20polymer%20surface%20area%20on%20long-term%20anodic%20peak%20current%20stability.pdf; http://irep.iium.edu.my/59635/; http://journals.iium.edu.my/ejournal/index.php/iiumej/pages/view/future_articles
• Institution: Universiti Islam Antarabangsa Malaysia

Contamination of drinking water by hazardous agents is becoming a serious global threat, so it is necessary to develop more efficient sensing technologies for applications in liquid media. The limited working lifetime of electrochemical biosensors, especially when measurements are made continuously in liquid media, remains an unsolved challenge. We studied the effect of PEDOT:PSS surface area on platinum microelectrodes with respect to electrode ability to conduct reversible ion-to-electron transduction in liquid media. Electropolymerization of 3,4-ethylenedioxythiophene:poly(styrene sulfonate) EDOT:PSS to poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) was conducted on microplatinum electrodes 5 and 10 mm long using a galvanostatic mode. Cyclic voltammetry was used to determine capacitive peak current; higher peak current indicates higher redox capacitance. Field-emisison scanning-electron microscopy was used to study the surface morphology of the PEDOT:PSS transucer layer after measurement in liquid media. The anodic capacitive peak currents did not differ significantly between the two electrodes at day one (~0.20 mA); however, peak current decreased by ~ 20% and ~ 80% at day six for 10- and-5 mm electrode lengths, respectively. The results imply that PEDOT:PSS surface area plays a role in transduction of PEDOT:PSS in aqueous media. Air minuman yang dicemari agen merbahaya telah menjadi isu ancaman global yang serius, jadi aplikasi teknologi yang sesuai bagi mengesan bendasing dalam cecair adalah sangat diperlukan. Biosensor elektrokimia mempunyai kekangan jangka hidup untuk beroperasi, terutama apabila bacaan diambil secara berterusan dalam medium cecair, masalah ini tinggal bermasalah dan masih belum diselesaikan. Kami mengkaji kesan PEDOT:PSS pada permukaan kawasan di atas mikro-elektrod, keupayaan elektrod untuk menggerakkan cas ion-kepada-elektron secara terbalik secara langsung dalam medium cecair. Elektropolimer 3,4-ethylenedioxythiophene:poly(styrene sulfonate) EDOT:PSS kepada poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) telah dijalankan ke atas elektrod mikroplatinum 5 dan 10 mm panjang dengan menggunakan mod galvanostatik. Kitaran voltametri telah digunakan untuk mendapatkan arus maksima kapasitan. Arus maksimum bermakna ketinggian redox kapasitan. Proses mikroskopi dapat mengesan elektron di kawasan-telah digunakan dalam kajian ini terhadap permukaan morfologi PEDOT:PSS pada permukaan sensor selepas bacaan sukatan diambil dalam medium cecair. Arus maksimum anod kapasitan tidak jauh berbeza antara kedua elektrod pada hari pertama (~0.20 mA); tetapi, arus maksimum telah berkurangan sebanyak ~ 20% dan ~ 80% pada hari ke enam bagi 10 dan 5 mm panjang elektrod, masing-masing. Keputusan menunjukkan permukaan kawasan PEDOT:PSS memainkan peranan dalam pergerakan arus PEDOT:PSS dalam medium cecair.