Optical and Electrochemical Combination Sensor with Poly‐Aniline Film Modified Gold Surface and Its Application for Dissolved Oxygen Detection

Li, Meng; Liu, Wei; Correia, J. Pinto; Mourato, Ana; Viana, Ana S.; Jin, Gang

doi:10.1002/elan.201300459

Cited by 18 publications

(14 citation statements)

References 35 publications

(40 reference statements)

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“…It is worth of notice that this feeble modification of the surface can be perceived by the TIRIE optical monitoring of the electrode (Figure 2 B). In the backward potential scan, a cathodic wave with an onset potential of E ≈200 mV (vs. SCE) and centred at E ≈−100 mV (vs. SCE) must be attributed to the presence of FeTSPP in solution since it did not occur during the polymerization of aniline on gold in the absence of the metal‐complex 11,32. The thickening of the film upon repetitive potential cycling is evidenced by the continuous increase of the height of the polymer redox peaks in the potential range −100 to 300 mV (vs. SCE).…”

Section: Resultsmentioning

confidence: 99%

“…The results obtained with the combination system using a PAn‐modified gold film (Au‐PAn) confirm that PAn has the ability to amplify the optical signal of the combination system for DO detection 11. Nevertheless, under optimal conditions the optical signal achieved by Au‐PAn is about 10 units in the TIRIE grayscale, which is still very limited.…”

Section: Introductionmentioning

confidence: 89%

“…Scheme B (see 11 for further information) shows the detailed scheme of the cell used in this work. The electrochemical cell is separated from the sample cell by an oxygen‐permeable membrane.…”

Section: Methodsmentioning

confidence: 99%

“…As a result, Clark‐type oxygen sensors need frequent and elaborate precalibration, especially for long‐term measurements 9, 10. To overcome the problem of signal drift, an optical and electrochemical integrated methodology has been proposed based on total internal reflection imaging ellipsometry (TIRIE) 11. In this combination system (EC‐TIRIE), a gold film coated on a glass slide is used as both the working electrode and the optical sensing surface, producing simultaneous optical and electrochemical signals that can be easily monitored.…”

Section: Introductionmentioning

confidence: 99%

“…However using only the gold film the optical signal change is very small. From oxygen‐free to oxygen‐containing solution, the optical signal change is less than 2 grayscale units 11. To amplify the optical signal, an electronically conducting polymer, polyaniline (PAn), is used to cover the gold film surface due to its specific optical and electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

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Improved Potentiometric and Optic Sensitivity of Polyaniline Film to Dissolved Oxygen by Incorporating Iron‐Porphyrin

Ornelas

Liu

et al. 2015

Electroanalysis

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Polyaniline (PAn) films can be used in an electrochemical and optical combination system to amplify the optical signal for dissolved oxygen (DO) detection. To further improve the sensitivity of PAn film to DO, an oxygen‐sensitive molecule, Fe(III) meso‐tetera (4‐sulfonatophenyl) porphyrin (FeTSPP) is incorporated into PAn during the film generation. Results show that, after incorporating FeTSPP into the PAn matrix, both optical and potentiometric responses to DO are improved. The optimal optical signal is obtained under the application of −2.5 μA to the modified electrode. Under this applied current, both optical and potentiometric signals show linear relations with the DO concentration within the range of 0.00–4.63 mg L−1, and the sensitivities for optical and potentiometric signals are 4.18 grayscale units mg−1 L and 13.39 mV mg−1 L, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improved Potentiometric and Optic Sensitivity of Polyaniline Film to Dissolved Oxygen by Incorporating Iron‐Porphyrin

Ornelas

Liu

et al. 2015

Electroanalysis

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A Novel Electroactive Polymer for pH‐independent Oxygen Sensing

Pang

Chen

et al. 2015

Electroanalysis

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O 2 is criticalf or mammalian cell survival asi tf unctions as the finale lectron acceptor in the electron transport chain, which creates aH + gradient that is needed to drive the oxidative phosphorylation of adenosine triphosphate (ATP) in the mitochondria during aerobic cellularr espiration [1].M ammalian cells are sensitive to the levels of dissolved O 2 .W hen the cell is lacking in O 2 ,i ts witches over to anaerobic cellular respiration. However,p rolonged O 2 deprivation can cause cell death. Hence,t he measuremento fd issolved O 2 concentration is clinically important for detectinga nd monitoring ischemia [2],p articularly for patients with traumatic braini njuries [3],a nd for the study of hypoxia in cancer development [4].One major challenget ot he detection of O 2 concentration in biological samples is the change in pH. Fore xample,a ni ncrease in energy metabolism by the cell enhances glycolysis, causing the production of lactate and CO 2 to increase under anaerobic and aerobic conditionsr espectively,l eading to extracellular acidification [5].A lthough buffers such as phosphate buffered saline (PBS) and sodium bicarbonate are commonly used for biological samples,t he useful buffer range is only pK a AE 1p Hu nit. + reactiona tt he electrode [6b,8a-c].H ence,u ndetected changes in the pH of the biological sample will introduce inaccuracies in the concentrationo fd issolved O 2 measured usings uch sensors and materials.T hus,t here is an eed to developamediator for pH-independent O 2 sensing in the range of pH 4t o8w hich is relevant to physiology [9] and it needs to be capable of detecting dissolved O 2 typically below 245 mM [ 10].We chose to use electropolymerisation to prepare the mediator as it is af acile method for modifying the Au electrode,w hich is the electrode material of choice in physiology [11] and is also commonly used in chip-based devices for biological investigations [12].Phenothiazines are attractive materials for electrode modification as they can be electropolymerised. Methylene blue (MB + ) ( Fig. 1a) is ap henothiazine derivative with substituentsa tt he 3a nd 7p ositions [ 13].I tc an undergo as erieso fe lectron transfers and proton transfers depending on the pH to give leuco methylene blue (LMB), which is colourless [14].M B + is electroactive and water-soluble [15] and its electrochemical reduction is shown in Fig. 1b.I th as been used in molecularly imprinted polymerm odified electrodes [16] and as ar edox mediator in enzymatic electrochemical biosensors [17].Abstract:M ethylene blue (MB + )a nd pyrrole were copolymerised to electrodeposit an ovel electroactivep olymer on aA ue lectrode which was assessed for O 2 sensing. The electroactivep olymere xhibits diffusion-limitedb ehaviour and an electrochemical, followedb yc atalytic (EC')mechanism in the presenceo fd issolvedO 2 .N otably,i ti sp Hinsensitive in both N 2 -purged and air-equilibrated phosphate buffered saline( PBS) from pH 4t o8 .I ti s stable over 18 days,p ossesses ag ood sensitivity of 256.335 mAmM À1 cm À2,...

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High-performance polyethylene dissolved oxygen sensor with a petallike surface

et al. 2021

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Dissolved oxygen (DO) level is of capital importance in the field of environmental monitoring, food fermentation, industrial production, and clinical medicine. Optical oxygen sensors with high sensitivity, accuracy, stability, and anti-jamming capability for DO content detection have provoked scientists' attention in recent years. In this work, we selected platinum octaethylporphine (PtOEP), low-density polyethylene (LDPE), and high-density polyethylene (HDPE) as the fluorescent indicator and matrix materials, respectively. Porous LDPE/PtOEP and HDPE/PtOEP oxygen-sensing films were constructed by incorporating PtOEP in PE via the phase-separation method. The optimum parameters were obtained as follows: the concentrations of LDPE and HDPE solutions were 0.010 mg/L, and PtOEP was 8 μg. Based on the above study, the effects of different kinds of PE on the performance of the oxygen-sensing film were studied in detail, finding that the LDPE/PtOEP oxygen-sensing film had better photostability and could measure the DO concentrations of several water samples accurately.

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Optical and Electrochemical Combination Sensor with Poly‐Aniline Film Modified Gold Surface and Its Application for Dissolved Oxygen Detection

Cited by 18 publications

References 35 publications

Improved Potentiometric and Optic Sensitivity of Polyaniline Film to Dissolved Oxygen by Incorporating Iron‐Porphyrin

Improved Potentiometric and Optic Sensitivity of Polyaniline Film to Dissolved Oxygen by Incorporating Iron‐Porphyrin

A Novel Electroactive Polymer for pH‐independent Oxygen Sensing

High-performance polyethylene dissolved oxygen sensor with a petallike surface

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