Enhanced Electrocatalytic Performance for Methanol Oxidation via Insertion of Ruthenium Oxide Particles into Pt and Polyaniline-Poly(Acrylic Acid-co-Maleic Acid) Composite Electrode

Kuo, Chung‐Wen; Kuo, Zheng-Yan; Wu, Tzi‐Yi; Chen, Jingyuan; Li, Wenbin

doi:10.1149/ma2012-02/13/1449

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…We studied the chemical stability of conductive PANI-based multilayer films by immersing them into aqueous solutions of different pH values (Figure 3). In the UV−vis spectra, a characteristic band at ∼420 nm and a broad absorption band indicate the presence of the conductive ES state, 44,45 whereas the EB and PS characteristics can be shown by the adsorption bands at ∼630 and ∼660 nm, respectively. 32,46 For all samples, the absorbance band at ∼420 nm gradually decreased with the increasing pH, which indicates the decrease in electrical conductivity.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Recovery of Electrochemical Properties of Polyaniline-Based Multilayer Films with Improved Electrochemical Stability

Firda

Jeon

2022

ACS Appl. Polym. Mater.

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Owing to its unique structure and reduction–oxidation (redox) properties, polyaniline (PANI) has been widely used in diverse applications, including sensors, solar cells, electrochromic devices, batteries, and supercapacitors. However, irreversible redox reactions between different oxidation states of PANI often result in low chemical and electrochemical stability, deteriorating devices’ performance characteristics. Herein, we fabricated PANI-based multilayer films using spin-assisted layer-by-layer assembly, providing significantly improved chemical and electrochemical stability compared to the PANI homopolymer. More importantly, we found that the electroactivity and electrical conductivity of PANI-based films can be restored by a simple chemical reactivation process using an acidic aqueous solution. The re-doping process successfully recovers the electrochemical properties of PANI, even improving the electroactivity and conductivity characteristics of polyacid-doped PANI films, attributed to the secondary doping and rearrangement of polymers. Furthermore, we demonstrate that the performance of PANI multilayer films for ammonia sensors is successfully restored after the reactivation process.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Recovery of Electrochemical Properties of Polyaniline-Based Multilayer Films with Improved Electrochemical Stability

Firda

Jeon

2022

ACS Appl. Polym. Mater.

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“…When observing the bare PANI sensor prior to functionalization, it is characterized as emeraldine salt PANI (green color) due to the absorbance peaks at 425 and 800 nm. These peaks represent the polaron bands and free-electron absorbance tail, respectively . Submerging the bare PANI sensor with aqueous ammonia deprotonated the conductive polymer and transitions to emeraldine base (navy blue), characterized by the peaks at 350 and 640 nm and corresponds to the π–π* transition of benzenoid rings and exciton transition of quinoid rings, respectively .…”

Section: Resultsmentioning

confidence: 99%

“…These peaks represent the polaron bands and free-electron absorbance tail, respectively . Submerging the bare PANI sensor with aqueous ammonia deprotonated the conductive polymer and transitions to emeraldine base (navy blue), characterized by the peaks at 350 and 640 nm and corresponds to the π–π* transition of benzenoid rings and exciton transition of quinoid rings, respectively . Electrochemical deposition of arginine blue shifts the peak to 625 nm, indicating a decrease in the conjugation of the structure .…”

Section: Resultsmentioning

confidence: 99%

Fentanyl Assay Derived from Intermolecular Interaction-Enabled Small Molecule Recognition (iMSR) with Differential Impedance Analysis for Point-of-Care Testing

et al. 2022

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Rapid and effective differentiation and quantification of a small molecule drug, such as fentanyl, in bodily fluids are major challenges for diagnosis and personal medication. However, the current toxicology methods used to measure drug concentration and metabolites require laboratory-based testing, which is not an efficient or cost-effective way to treat patients in a timely manner. Here, we show an assay for monitoring fentanyl levels by combining the intermolecular interaction-enabled small molecule recognition (iMSR) with differential impedance analysis of conjugated polymers. The differential interactions with the designed anchor interface were transduced through the perturbance of the electric status of the flexible conducting polymer. This assay showed excellent fentanyl selectivity against common interferences, as well as in variable body fluids through either testing strips or skin patches. Directly using the patient blood, the sensor provided 1%–5% of the average deviation compared to the “gold” standard method LC-MS results in the medically relevant fentanyl range of 20–90 nM. The superior sensing properties, in conjunction with mechanical flexibility and compatibility, enabled point-of-care detection and provided a promising avenue for applications beyond the scope of biomarker detection.

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Enhanced Electrocatalytic Performance for Methanol Oxidation via Insertion of Ruthenium Oxide Particles into Pt and Polyaniline-Poly(Acrylic Acid-co-Maleic Acid) Composite Electrode

Abstract: not Available.

Cited by 2 publications

References 2 publications

Recovery of Electrochemical Properties of Polyaniline-Based Multilayer Films with Improved Electrochemical Stability

Recovery of Electrochemical Properties of Polyaniline-Based Multilayer Films with Improved Electrochemical Stability

Fentanyl Assay Derived from Intermolecular Interaction-Enabled Small Molecule Recognition (iMSR) with Differential Impedance Analysis for Point-of-Care Testing

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