Surface patterning of multilayer graphene by ultraviolet laser irradiation in biomolecule sensing devices

• Published in: Applied surface science 2015-12, Vol.359, p.543-549
• Main Authors: Chang, Tien-Li, Chen, Zhao-Chi
• Format: Article
• Language: English
• Subjects: Biomolecules; Graphene; Irradiation; Laser irradiation; Lasers; Multilayer graphene; Multilayers; Nanostructure; Patterning; Sensing devices; Surface patterning
• ISSN: 0169-4332
• DOI: 10.1016/j.apsusc.2015.10.128

•Direct UV laser irradiation on multilayer graphene was discussed.•Multilayer graphene with screen-printed process was presented.•Surface patterning of multilayer graphene at fluence threshold was investigated.•Electrical response of glucose in sensing devices can be studied. The study presents a direct process for surface patterning of multilayer graphene on the glass substrate as a biosensing device. In contrast to lithography with etching, the proposed process provides simultaneous surface patterning of multilayer graphene through nanosecond laser irradiation. In this study, the multilayer graphene was prepared by a screen printing process. Additionally, the wavelength of the laser beam was 355nm. To perform the effective laser process with the small heat affected zone, the surface patterns on the sensing devices could be directly fabricated using the laser with optimal control of the pulse overlap at a fluence threshold of 0.63J/cm2. The unique patterning of the laser-ablated surface exhibits their electrical and hydrophilic characteristics. The hydrophilic surface of graphene-based sensing devices was achieved in the process with the pulse overlap of 90%. Furthermore, the sensing devices for controlling the electrical response of glucose by using glucose oxidase can be used in sensors in commercial medical applications.