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Laser Direct Writing (LDW) of Graphene Patterns on Ceramic Utilizing a Flour Paste
Y-H. Huang, S-J. Ni and L. Li

Depositing patterned graphene on ceramic has been challenging due to multiple process steps required. In this paper a 355 nm wavelength ultraviolet (UV) picosecond laser was used to irradiate flour paste deposited on an Al2O3 ceramic substrate to form graphene without the need for a metallic precursor. The effect of process parameters including laser power, scanning speed, repetition rate and concentrations of the flour solution on graphene formation is investigated. The result shows that a concentration of 20% white wheat flour solution mixed with deionized water can ideally generate high-quality graphene when processed with the picosecond laser at a 38 J/cm2 laser fluence with 30 to 36 scan passes at a scanning speed of 100 mm/s. This low cost, one-step and versatile technique would have the potential for making high-temperature electrical devices and sensors

Keywords: Picosecond laser, graphene, alumina, Al2O3, plain white flour, ultraviolet (UV), laser direct writing (LDW), additive manufacturing (AM)

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