Characterisation of graphene electrodes for microsystems and microfluidic devices

Rosso, Michelle Del; Brodie, C. Harrison; Ramalingam, Saipriya; Cabral, David M.; Pensini, Erica; Singh, Ashutosh; Collier, Christopher M.

doi:10.1038/s41598-019-42108-x

Cited by 9 publications

(5 citation statements)

References 23 publications

(23 reference statements)

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“…The surface images of electrode surfaces were taken with the scanning electron microscopy technique in order to see the surface morphology of electrodes and observe physical changes on the electrode surfaces [24] (Figure 5).…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Determination of ascorbic acid at solid electrodes modified with L-cysteine

İzi

Yazicigil

2023

J. Electrochem. Sci. Eng.

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Gold and glassy carbon electrode surfaces were modified with L-cysteine, and the electrochemical behavior of ascorbic acid (AA) was investigated on these new surfaces. To improve the efficiency of electrodes, the electrode surfaces were modified and optimum conditions for AA determination were established. Electrochemical experiments were performed at different potential ranges, the concentration of AA, scan rates, number of polymerization cycles and pH values. Using cyclic voltammetry (CV) technique, optimum conditions were determined as the potential scanning range of 0.2 to 1.5 V vs. Ag/AgCl in 0.1 M phosphate buffer solution (pH 7.02) for the L-cysteine/Au electrode, and -1.95 to 1.9 V vs. Ag/AgCl in 0.1 M phosphate buffer solution (pH 2.7) for the L-cysteine/GC electrode. For the characterization of both modified electrode surfaces, a series of physicochemical techniques was also applied. The usability and selectivity of these two proposed modified electrodes for the determination of AA were investigated using square wave voltammetry (SWV) in the presence of possible interferents, i.e., glycine, L-glutamic acid and uric acid.

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Section: Scanning Electron Microscopymentioning

confidence: 99%

Determination of ascorbic acid at solid electrodes modified with L-cysteine

İzi

Yazicigil

2023

J. Electrochem. Sci. Eng.

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“…These optofluidic devices must also have scalable architectures, as small reactant volumes (e.g., less than 10 nL) are desired for high-throughput operation. [20][21][22] Scalability is an important research area for droplet-based optofluidic devices, [23][24][25] also known as digital microfluidic devices.…”

Section: Introductionmentioning

confidence: 99%

A digital microfluidic chip with programmable open system actuation and enhanced optical annealing with near‐infrared light

Lepard

Spotts

Brodie

et al. 2023

Engineering Reports

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This work investigates a digital microfluidic chip and presents an advancement to microfluidic optical annealing methods through the application of whispering gallery mode (WGM) with near infrared excitation. Establishing a microfluidic chip with point‐of‐care capabilities, including actuation and annealing, has proven to be important. Unfortunately, poor heat absorption due to the long optical penetration depth of near infrared light creates scaling limitations for applications in optical‐based microfluidics. Through the application of WGM, the interaction length between the droplet and light is increased beyond the droplet diameter to improve heating and optical absorption. This is supported by finite‐difference time‐domain electromagnetic simulations and experimental results showing a greatly improved temperature change. Such a system is implemented in an open system digital microfluidic chip, to facilitate annealing via side illumination of droplets. The open system digital microfluidic chip is programmable for droplet actuation. The fundamental experiment of preprogrammed actuation of microdroplets is demonstrated in a 36 electrode grid. The results of annealing and actuation show potential for implementation in point‐of‐care microfluidic devices.

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“…At present, scanning electron microscope (SEM) is mostly used to observe the surface structure of materials [46,47]. Scanning electron microscope with energy dispersive spectrometer (SEM-EDS) can also be used to characterize and identify the elements in raw materials and products [48].…”

Section: Introductionmentioning

confidence: 99%

Study on the microstructure of the symbiosis of coal-based graphene and coal-based graphene quantum dots: preparation and characterization

Li¹,

Tang²,

Che³

et al. 2022

Nanotechnology

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Coal-based graphene sheets (GS) and coal-based graphene quantum dots (GQDs) are usually prepared separately. In this paper, symbiosis of coal-based GS and coal-based GQDs was successfully prepared with our proposed preparation method by using three raw coals with different reflectance (collected from Qinshui coalfield, Shanxi Province) as carbon sources. The results showed that coal-based GS and coal-based GQDs can exist stably in the symbiosis and are distributed in different layers, and the GQDs are freely distributed between layers of GS. The average number of GS (N ave) in the three symbiosis is about 7 and the average interlayer spacing (d 002) is about 0.3887 nm. The average diameter of GQDs in the three symbiosis is about 4.255 nm and the average d 002 is about 0.230 nm. The average N ave of the three symbiosis was about 3 and the average d 002 is about 0.361 nm. The morphology and crystal parameters of symbiosis is more similar to that of graphene, the elements are only carbon and oxygen. In the prepared symbiosis, the higher the reflectance of raw coal, the smoother the lattice skeleton and the less vortex-layer structure of GS, and the larger the diameter and the denser the six membered ring of GQDs. The C and O functional groups of the prepared symbionts are similar. The higher the reflectance of coal, the higher the content of C–C/C=C. Under ultraviolet light, the prepared products all emit blue, and the higher the reflectance of coal, the higher the ultraviolet absorption, and the stronger the fluorescence intensity.

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Characterisation of graphene electrodes for microsystems and microfluidic devices

Cited by 9 publications

References 23 publications

Determination of ascorbic acid at solid electrodes modified with L-cysteine

Determination of ascorbic acid at solid electrodes modified with L-cysteine

A digital microfluidic chip with programmable open system actuation and enhanced optical annealing with near‐infrared light

Study on the microstructure of the symbiosis of coal-based graphene and coal-based graphene quantum dots: preparation and characterization

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