Solvent-free preparation of hydrophilic fluorinated graphene oxide modified with amino-groups

Zhu, Wu; Wu, Congjie; Chang, Yixun; Cheng, Hengchao; Yu, Chengbing

doi:10.1016/j.matlet.2018.09.174

Cited by 16 publications

(3 citation statements)

References 12 publications

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“…An improved Hummer’s method [ 32 , 33 ] was used to prepare FGO by adding FGi (3 g) and NaNO 3 (1.5 g) to H 2 SO 4 (70 mL) in an ice bath. Then, they were dispersed by magnetic stirring in order for FGi to be completely soaked and pre-oxidized by H 2 SO 4 .…”

Section: Methodsmentioning

confidence: 99%

Preparation of Modified Fluorographene Oxide with Interlayer Supporting Structure

Shi

Ning

et al. 2021

Polymers

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Fluorinated graphene (FGi) is easy to agglomerate, after which it turns into a curly and wavy shape, which results in a great decrease in the properties of the resultant composite materials and coatings. In this study, fluorinated graphene oxide (FGO) modified with p-phenylenediamine (PPD) was prepared, but with a view to avoid its agglomeration and retain a sheet-like structure. Through the reaction between PPD and the epoxy groups of FGO, the modified FGO with an amino group (N-PGO) had a larger interlayer d-spacing than FGO. The stability of N-PGO was also improved, and nitrogen, fluorine, oxygen, and carbon were evenly distributed in the N-PGO sheets. All the results indicate that PPD can act as an effective spacer to separate graphene sheets for good anti-agglomeration properties. This method produced modified graphene with fluorine, amino, and carbonyl groups. It shows potential in introducing N-PGO as a reactive modifier in composite materials and coatings for a variety of industrial applications including waterborne epoxy materials.

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Section: Methodsmentioning

confidence: 99%

Preparation of Modified Fluorographene Oxide with Interlayer Supporting Structure

Shi

Ning

et al. 2021

Polymers

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“…The main advantage of FGO for sensing is its high electrocatalytic activity (augmented electron transfer), and specificity toward certain analytes due to the presence of C–F bonds [ 69 , 70 ]. It has been observed that low fluorinated graphene exhibits excellent sensing properties for a range of studied biomolecules and the low fluoride (F) content that augments the electron transfer from electrode to biomolecule (or vice versa) will neither significantly affect the electrical conductivity nor the wetting properties of graphene [ 71 , 72 ].…”

Section: Implementation Of Organic Thin Film Materials In Corrosion Sensingmentioning

confidence: 99%

A Review of Corrosion in Aircraft Structures and Graphene-Based Sensors for Advanced Corrosion Monitoring

Chakik

Prakash

2021

Sensors

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Corrosion is an ever-present phenomena of material deterioration that affects all metal structures. Timely and accurate detection of corrosion is required for structural maintenance and effective management of structural components during their life cycle. The usage of aircraft materials has been primarily driven by the need for lighter, stronger, and more robust metal alloys, rather than mitigation of corrosion. As such, the overall cost of corrosion management and aircraft downtime remains high. To illustrate, $5.67 billion or 23.6% of total sustainment costs was spent on aircraft corrosion management, as well as 14.1% of total NAD for the US Air Force aviation and missiles in the fiscal year of 2018. The ability to detect and monitor corrosion will allow for a more efficient and cost-effective corrosion management strategy, and will therefore, minimize maintenance costs and downtime, and to avoid unexpected failure associated with corrosion. Conventional and commercial efforts in corrosion detection on aircrafts have focused on visual and other field detection approaches which are time- and usage-based rather than condition-based; they are also less effective in cases where the corroded area is inaccessible (e.g., fuel tank) or hidden (rivets). The ability to target and detect specific corrosion by-products associated with the metals/metal alloys (chloride ions, fluoride ions, iron oxides, aluminum chlorides etc.), corrosion environment (pH, wetness, temperature), along with conventional approaches for physical detection of corrosion can provide early corrosion detection as well as enhanced reliability of corrosion detection. The paper summarizes the state-of-art of corrosion sensing and measurement technologies for schedule-based inspection or continuous monitoring of physical, environmental and chemical presence associated with corrosion. The challenges are reviewed with regards to current gaps of corrosion detection and the complex task of corrosion management of an aircraft, with a focused overview of the corrosion factors and corrosion forms that are pertinent to the aviation industry. A comprehensive overview of thin film sensing techniques for corrosion detection and monitoring on aircrafts are being conducted. Particular attention is paid to innovative new materials, especially graphene-derived thin film sensors which rely on their ability to be configured as a conductor, semiconductor, or a functionally sensitive layer that responds to corrosion factors. Several thin film sensors have been detailed in this review as highly suited candidates for detecting corrosion through direct sensing of corrosion by-products in conjunction with the aforementioned physical and environmental corrosion parameters. The ability to print/pattern these thin film materials directly onto specific aircraft components, or deposit them onto rigid and flexible sensor surfaces and interfaces (fibre optics, microelectrode structures) makes them highly suited for corrosion monitoring applications.

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“…The low fluorine (F) content that augments the electron transfer from electrode to biomolecule (or vice versa) will neither significantly affect the electrical conductivity nor the wetting properties of graphene [134]. The fluorine adatom introduced into GO is suggested that the fluorine-carbon bond and the Fermi level change of FGO exhibits the necessary characteristics for gas sensing [88].…”

Section: Graphene Oxide Reduction and Fluorinationmentioning

confidence: 99%

Fluorinated Graphene Oxide Based Chemiresistive Gas Sensor Targeting NH3 and Other Analytes Under Atmospheric Conditions

Amor¹

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Emergence of graphene-derived highly functional materials has transformed chemical and biological sensing. Several novel approaches utilizing chemical modification of graphene oxide (GO) were investigated and implemented using these materials in sensor fabrication for the detection of chemical analytes such as volatile organic compounds (VOC). The detection methods rely on using functionalization of modified graphene derivatives to target select analytes and produce a quantifiable, distinguishable electrical response. In this work, an in-house hydrothermal fluorination technique to synthesize fluorinated-GO (FGO) suspension was developed. The FGO material was drop coated in its solution phase onto interdigitated electrodes to create a chemiresistive gas sensor. An ultra-low-level detection of NH3 (~>2.26 ppm) was observed by the chemiresistive sensor which was extended to detect acetone and distinguish between their individual transient responses.The sensor system is fully integrated and miniaturized making it suitable for point-of-care, continuous health monitoring applications in exhaled breath testing.iii Co-AuthorshipThe content of this scientific body of work has been developed at the Organic Sensors and Devices Laboratory at Carleton university in 2019-2021. This work has produced one published conference paper, and one special issue conference paper submission (in progress).These described FGO chemiresistive sensors were able to quantify and distinguish noticeable responses to changes in select gas concentration. The sensitivity, specificity, reliability, are all established with a low-cost synthesis fabrication process. The first conference paper describes a novel FGO chemiresistive sensor able to detect ammonia and acetone in ultra-low concentrations and its viability for point-of-care, non-invasive health monitoring. The second paper is in submission progress and pertains to the same work with a focus on the hybrid implementation of the sensor onto a custom printed circuit board (PCB) for data acquisition and production on flexible polymer substrates. This experimental work presented in this thesis with references A and B were in collaboration with the author, research supervisor Prof. Ravi Prakash, Dr. Siziwe Bebe and Bruno Gamero at the Organic sensors and devices laboratory (OSDL) at Carleton University. The graphene material was kindly provided by Brian Kennedy from KennedyLabs. Electrode patterning was carried out by the Carleton University nanofabrication team led by Mr. Rob Vandusen, with material deposition carried out with assistance Dr. Siziwe Bebe. Development of these deposition techniques was created and carried out by Dr. Siziwe Bebe and Prof. Ravi Prakash. The readout circuit was built by the author, and Bruno Gamero. Data analysis was then performed by the author. Custom PCB design was carried out by the author with the assistance of Mr. Nagui Mikhail.

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Solvent-free preparation of hydrophilic fluorinated graphene oxide modified with amino-groups

Cited by 16 publications

References 12 publications

Preparation of Modified Fluorographene Oxide with Interlayer Supporting Structure

Preparation of Modified Fluorographene Oxide with Interlayer Supporting Structure

A Review of Corrosion in Aircraft Structures and Graphene-Based Sensors for Advanced Corrosion Monitoring

Fluorinated Graphene Oxide Based Chemiresistive Gas Sensor Targeting NH3 and Other Analytes Under Atmospheric Conditions

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