Graphene digital microfluidics microchip

Ugsornrat, Kessararat; Maturos, Thitima; Pasakon, Patiya; Karuwan, Chanpen; Sriprachuabwong, Chakrit; Pogfai, Tawee; Wisitsoraat, Anurat; Tuantranont, Adisorn

doi:10.1109/ecticon.2017.8096281

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…The most commonly used substrates include PCB board [7], ITO glass [8], silicon/glass wafer [9], and even paper [10] could be used as the substrate for the low‐cost approach of DMF. For electrodes, based on the choice of substrate, electrodes could be fabricated with gold [11], copper [12], silver [13] and carbon materials [14]. For the electrode fabrication process, sophisticated instruments, e.g.…”

Section: Introductionmentioning

confidence: 99%

Low‐cost and flexible film‐based digital microfluidic devices

Fan

Kong²,

Chai

et al. 2020

Micro & Nano Letters

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This work proposed a low-cost and rapid fabrication approach for flexible thin film-based digital microfluidics. In this approach, the carbon electrodes were screen-printed on the surface of a polyester film using carbon resistive ink. Then, a layer of polyethylene was applied to seal the polyester film with electrodes. Finally, a surface treatment was conducted to enhance the hydrophobicity. Compared with the conventional fabrication approaches for digital microfluidic devices using metal electrodes deposition on glass/silicon substrate, the proposed fabrication technique for polymer-based digital microfluidic device is simple, low-cost, flexible, and without the requirement of sophisticated photolithography procedure, metal deposition instruments and cleanroom environment. The proposed polymer-based digital microfluidic device has a total thickness <200 μm. The whole device is transparent, flexible and bendable. A series of tests were also conducted for the manipulation of water droplets using electrowetting on the fabricated digital microfluidic devices. The proposed fabrication technique for flexible film-based digital microfluidics could have wide potential point-of-care applications in biological and medical filed.

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Section: Introductionmentioning

confidence: 99%

Low‐cost and flexible film‐based digital microfluidic devices

Fan

Kong²,

Chai

et al. 2020

Micro & Nano Letters

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Microfluidic Electrochemical Devices for Biosensing

Nesakumar

Kesavan

et al. 2019

J. Anal. Test.

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Characterisation of graphene electrodes for microsystems and microfluidic devices

Rosso

Brodie

Ramalingam

et al. 2019

Sci Rep

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Fabrication of microsystems is traditionally achieved with photolithography. However, this fabrication technique can be expensive and non-ideal for integration with microfluidic systems. As such, graphene fabrication is explored as an alternative. This graphene fabrication can be achieved with graphite oxide undergoing optical exposure, using optical disc drives, to impose specified patterns and convert to graphene. This work characterises such a graphene fabrication, and provides fabrication, electrical, microfluidic, and scanning electron microscopy (SEM) characterisations. In the fabrication characterisation, a comparison is performed between traditional photolithography fabrication and the new graphene fabrication. (Graphene fabrication details are also provided.) Here, the minimum achievable feature size is identified and graphene fabrication is found to compare favourably with traditional photolithography fabrication. In the electrical characterisation, the resistivity of graphene is measured as a function of fabrication dose in the optical disc drive and saturation effects are noted. In the microfluidic characterisation, the wetting properties of graphene are shown through an investigation of the contact angle of a microdroplet positioned on a surface that is treated with varying fabrication dose. In the SEM characterisation, the observed effects in the previous characterisations are attributed to chemical or physical effects through measurement of SEM energy dispersive X-ray spectra and SEM images, respectively. Overall, graphene fabrication is revealed to be a viable option for development of microsystems and microfluidics.

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Graphene digital microfluidics microchip

Cited by 4 publications

References 17 publications

Low‐cost and flexible film‐based digital microfluidic devices

Low‐cost and flexible film‐based digital microfluidic devices

Microfluidic Electrochemical Devices for Biosensing

Characterisation of graphene electrodes for microsystems and microfluidic devices

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