High-Yield Production of Aqueous Graphene for Electrohydrodynamic Drop-on-Demand Printing of Biocompatible Conductive Patterns

Date
2020-01-17
Authors
Niaraki Asli, Amir Ehsan
Guo, Jingshuai
Lai, Pei Lun
Montazami, Reza
Hashemi, Nicole
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Mechanical Engineering
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Biomedical Sciences
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Ames Laboratory
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Bioeconomy Institute
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Mechanical EngineeringBiomedical SciencesAmes LaboratoryBioeconomy Institute
Abstract
Presented here is a scalable and aqueous phase exfoliation of graphite to high yield and quality of few layer graphene (FLG) using Bovine Serum Albomine (BSA) and wet ball milling. The produced graphene ink is tailored for printable and flexible electronics, having shown promising results in terms of electrical conductivity and temporal stability. Shear force generated by steel balls which resulted in 2–3 layer defect-free graphene platelets with an average size of hundreds of nm, and with a concentration of about 5.1 mg/mL characterized by Raman spectroscopy, atomic force microscopy (AFM), transmittance electron microscopy (TEM) and UV-vis spectroscopy. Further, a conductive ink was prepared and printed on flexible substrate (Polyimide) with controlled resolution. Scanning electron microscopy (SEM) and Profilometry revealed the effect of thermal annealing on the prints to concede consistent morphological characteristics. The resulted sheet resistance was measured to be Rs = 36.75 Ω/sqr for prints as long as 100 mm. Printable inks were produced in volumes ranging from 20 mL to 1 L, with potential to facilitate large scale production of graphene for applications in biosensors, as well as flexible and printable electronics.
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This article is published as Niaraki Asli, Amir Ehsan, Jingshuai Guo, Pei Lun Lai, Reza Montazami, and Nicole N. Hashemi. "High-yield production of aqueous graphene for electrohydrodynamic drop-on-demand printing of biocompatible conductive patterns." Biosensors 10, no. 1 (2020): 6. DOI: 10.3390/bios10010006. Copyright 2020 by the authors. Attribution 4.0 International (CC BY 4.0). Posted with permission.
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