Development of a nanocomposite chemiresistor sensor based on π-conjugated azo polymer and graphene blend for detection of dissolved oxygen

Olean‐Oliveira, André; Teixeira, Marcos F.S.

doi:10.1016/j.snb.2018.05.128

Cited by 28 publications

(14 citation statements)

References 22 publications

(23 reference statements)

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“…The oxidation and reduction of dissolved oxygen by the polarographic electrodes is a slow kinetic process requiring a high potential; thus, the electrocatalytic reaction of oxygen attracted much attention. Researchers used a variety of electrocatalytic materials to improve the electron transfer efficiency between the dissolved oxygen and the electrode surface [51,52]. In 2006, Lin analyzed the characteristics of vitamin B 12 and used it as the modification material of the electrode to improve the electrocatalytic activity.…”

Section: Dissolved Oxygen Detection Technologiesmentioning

confidence: 99%

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Wei

Jiao

et al. 2019

Sensors

127

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Dissolved oxygen is an important index to evaluate water quality, and its concentration is of great significance in industrial production, environmental monitoring, aquaculture, food production, and other fields. As its change is a continuous dynamic process, the dissolved oxygen concentration needs to be accurately measured in real time. In this paper, the principles, main applications, advantages, and disadvantages of iodometric titration, electrochemical detection, and optical detection, which are commonly used dissolved oxygen detection methods, are systematically analyzed and summarized. The detection mechanisms and materials of electrochemical and optical detection methods are examined and reviewed. Because external environmental factors readily cause interferences in dissolved oxygen detection, the traditional detection methods cannot adequately meet the accuracy, real-time, stability, and other measurement requirements; thus, it is urgent to use intelligent methods to make up for these deficiencies. This paper studies the application of intelligent technology in intelligent signal transfer processing, digital signal processing, and the real-time dynamic adaptive compensation and correction of dissolved oxygen sensors. The combined application of optical detection technology, new fluorescence-sensitive materials, and intelligent technology is the focus of future research on dissolved oxygen sensors.

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Section: Dissolved Oxygen Detection Technologiesmentioning

confidence: 99%

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Wei

Jiao

et al. 2019

Sensors

127

View full text Add to dashboard Cite

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“… 21 The formed dimer may be again oxidized because of the presence of the amino terminal groups on both sides of the Bismarck brown Y molecule, thus recoupling with other monomers and/or dimers (step 3), allowing the polymer chain to propagate over the surface of the FTO conductive substrate. 21 , 34 …”

Section: Resultsmentioning

confidence: 99%

“…The film’s characteristics and properties were investigated in 0.50 mol L –1 KCl (pH = 2.0) upon applying potentials of −0.30 and +0.30 V versus SCE; because of these potentials, it was possible to evaluate the nanocomposite film in its reduced (hydrazine—lower conductivity) and oxidized (azo—higher conductivity) forms. 28 , 34 , 58 …”

Section: Resultsmentioning

confidence: 99%

Mechanism of Nanocomposite Formation in the Layer-by-Layer Single-Step Electropolymerization of π-Conjugated Azopolymers and Reduced Graphene Oxide: An Electrochemical Impedance Spectroscopy Study

2020

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This work presents a study of the formation mechanism of electrochemically deposited alternating layers of azopolymer and graphene oxide, as well as a systematic study of the physicochemical characteristics of the resulting nanocomposite films by electrochemical impedance spectroscopy. The nanocomposite films were constructed by cyclic electropolymerization, which allowed for the assembly of thin films with alternating azopolymers and reduced graphene oxide (rGO) layers in one step. Morphological characterizations were performed by atomic force microscopy and scanning electron microscopy and verified that the electrodeposition of the poly(azo-BBY) polymeric film occurred during the anodic sweep, and the deposition of graphene oxide sheets took place during the cathodic sweep. By analyzing the electrochemical impedance spectra using equivalent circuit models, variations in the resistance and capacitance values of the system were monitored as a function of the amount of electrodeposited material on the fluorine doped tin oxide electrode. In addition, the interfacial phenomena that occurred during the electroreduction of the rGO sheets were monitored with the same method.

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“…The polymer film based on poly(azo‐BBR) was prepared as described by Olean‐Oliveira and Teixeira. [ 15 ] A potential cycling between −0.30 and +1.00 V (vs SCE) was applied to the FTO surface for 100 cycle scans at a scan rate of 50 mV s −1 in deaerated ethanolic solution (1.00 mol L −1 HCl) containing 10.0 mmol L −1 Bismarck Brown R (1,3‐benzenediamine,4,4′‐[(4‐methyl%201,3‐phenylene)bis(azo)]bis[6‐methyl]] – BBR).…”

Section: Methodsmentioning

confidence: 99%

Understanding the Performance of a Nanocomposite Based on a Conjugated Azo‐Polymer and Reduced Graphene Oxide with Photoelectrically Switchable Properties by Analyzing the Potential Profile during Photocurrent Generation

Pacheco

Olean‐Oliveira

Teixeira

2020

Macro Chemistry & Physics

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This work describes the photoelectrochemical properties of devices coated with poly(azo‐Bismarck Brown R) and the nanocomposite poly(azo‐Bismarck Brown R)/reduced graphene oxide. Chronoamperometric methods with pulsed light are applied to the polymer surfaces of poly(azo‐Bismarck R) and poly(azo‐Bismarck Brown R)/rGO nanocomposites at two applied potentials (corresponding to the reduced and oxidized polymer forms) to obtain information on the photocurrent in a short response time. The results indicate that the photoactivity of the nanomaterial depends on the oxidation state of the azo‐polymer and its chemical structure. The carrier mobility of the material is affected by the applied potential profile and consequently by the isomerism of the polymer backbone. This behavior explains the photoelectrochemical performance of the nanocomposite material. The photoresponsiveness of the semiconducting hybrid material with light‐switchable conductance is promising for applications in photoelectrochemical switches and molecular switching devices.

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Development of a nanocomposite chemiresistor sensor based on π-conjugated azo polymer and graphene blend for detection of dissolved oxygen

Cited by 28 publications

References 22 publications

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Review of Dissolved Oxygen Detection Technology: From Laboratory Analysis to Online Intelligent Detection

Mechanism of Nanocomposite Formation in the Layer-by-Layer Single-Step Electropolymerization of π-Conjugated Azopolymers and Reduced Graphene Oxide: An Electrochemical Impedance Spectroscopy Study

Understanding the Performance of a Nanocomposite Based on a Conjugated Azo‐Polymer and Reduced Graphene Oxide with Photoelectrically Switchable Properties by Analyzing the Potential Profile during Photocurrent Generation

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