Ultrasonic exfoliation of graphene in water: A key parameter study

Tyurnina, Anastasia V.; Tzanakis, Iakovos; Morton, Justin A.; Mi, Jiawei; Porfyrakis, Kyriakos; Maciejewska, Barbara M.; Grobert, Nicole; Eskin, Dmitry

doi:10.1016/j.carbon.2020.06.029

Cited by 101 publications

(79 citation statements)

References 58 publications

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“…The analysis of the Raman D/G band intensity ratio (I D /I G ) allows us to obtain information on the extent of structural disorder or defects in ex-Gr sheets [67]. The value of I D /I G was estimated to be 0.21, which is much lower than the previously reported values of 0.3-2.5 for graphene materials obtained by the sonication-based LPE methods [54]. This result indicates the absence of basalplane defects in the ex-Gr sheets.…”

Section: Preparation and Characterization Of Ex-gr Inksmentioning

confidence: 74%

Highly Concentrated, Conductive, Defect-free Graphene Ink for Screen-Printed Sensor Application

et al. 2021

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Highlights Ultrathin and defect-free graphene ink is prepared through a high-throughput fluid dynamics process, resulting in a high exfoliation yield (53.5%) and a high concentration (47.5 mg mL−1). A screen-printed graphene conductor exhibits a high electrical conductivity of 1.49 × 104 S m−1 and good mechanical flexibility. An electrochemical sodium ion sensor based on graphene ink exhibits an excellent potentiometric sensing performance in a mechanically bent state. Real-time monitoring of sodium ion concentration in sweat is demonstrated. Abstract Conductive inks based on graphene materials have received significant attention for the fabrication of a wide range of printed and flexible devices. However, the application of graphene fillers is limited by their restricted mass production and the low concentration of their suspensions. In this study, a highly concentrated and conductive ink based on defect-free graphene was developed by a scalable fluid dynamics process. A high shear exfoliation and mixing process enabled the production of graphene at a high concentration of 47.5 mg mL−1 for graphene ink. The screen-printed graphene conductor exhibits a high electrical conductivity of 1.49 × 104 S m−1 and maintains high conductivity under mechanical bending, compressing, and fatigue tests. Based on the as-prepared graphene ink, a printed electrochemical sodium ion (Na+) sensor that shows high potentiometric sensing performance was fabricated. Further, by integrating a wireless electronic module, a prototype Na+-sensing watch is demonstrated for the real-time monitoring of the sodium ion concentration in human sweat during the indoor exercise of a volunteer. The scalable and efficient procedure for the preparation of graphene ink presented in this work is very promising for the low-cost, reproducible, and large-scale printing of flexible and wearable electronic devices.

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Section: Preparation and Characterization Of Ex-gr Inksmentioning

confidence: 74%

Highly Concentrated, Conductive, Defect-free Graphene Ink for Screen-Printed Sensor Application

et al. 2021

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“…When the MoS 2 is exfoliated, the organic solvent molecules (or the surfactant molecules, in case of an aqueous dispersion) stabilize the MoS 2 nanosheets, in turn preventing reaggregation. This means that the interaction between MoS 2 nanosheets and solvent molecules is stronger than the interlayer forces present between the MoS 2 sheets of the bulk crystal [52] , [53] , [54] .…”

Section: Resultsmentioning

confidence: 99%

Ultrasonication-assisted liquid-phase exfoliation enhances photoelectrochemical performance in α-Fe2O3/MoS2 photoanode

Masoumi

Tayebi

Lee

2021

Ultrasonics Sonochemistry

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“…In case of disintegrated gas, these vibrations can allow the gas bubbles to come together and more easily leave the solution. Sonicator either produce sound waves into a water shower, samples are put, or can be probes that are put straightforwardly into the example to be sonicated [57] . The desperation rate may vary time to time and power being utilized and pulse rate may count.…”

Section: Preparation Of Graphene-nanofluidmentioning

confidence: 99%

Ultrasonication an intensifying tool for preparation of stable nanofluids and study the time influence on distinct properties of graphene nanofluids – A systematic overview

Sandhya

Ramasamy

Sudhakar

et al. 2021

Ultrasonics Sonochemistry

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Ultrasonic exfoliation of graphene in water: A key parameter study

Cited by 101 publications

References 58 publications

Highly Concentrated, Conductive, Defect-free Graphene Ink for Screen-Printed Sensor Application

Highly Concentrated, Conductive, Defect-free Graphene Ink for Screen-Printed Sensor Application

Ultrasonication-assisted liquid-phase exfoliation enhances photoelectrochemical performance in α-Fe2O3/MoS2 photoanode

Ultrasonication an intensifying tool for preparation of stable nanofluids and study the time influence on distinct properties of graphene nanofluids – A systematic overview

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