Printing 2D Materials

A sprayed graphene transistor platform for rapid and low-cost chemical sensing

“…61) and a surface tension of only 20.34 mN m −1 , satisfying both criteria. From the wide range of possible graphene ink preparation methods, 50,62–64 we select sonication-assisted LPE due to its simplicity and compatibility with low-boiling solvents. 52 We sonicate 500 mg of graphite in 50 mL IPA for 9 hours stabilised by small quantities (20 mg) of the biocompatible polyvinylpyrrolidone (PVP) to enable achieving the required concentration and improving the ink shelf life.…”

Graphene production by cracking

“…Graphene is defined as a single-atom flat monolayer made of sp 2 -hybridized ‘honeycomb’ carbon lattice [ 1 – 3 ]. During the past two decades, scientists have discovered numerous unique properties of graphene such as high optical performance [ 4 ], high charge carriers mobility (due to electric field effect) [ 5 ] and thermal conductivity [ 6 ], and demonstrated a significant number of potential applications for this material in its ‘gold rush’ years [ 2 , 7 ], covering different areas including field emission [ 8 , 9 ], gas and biosensors [ 10 , 11 ], field-effect transistors [ 5 ], transparent electrodes [ 4 , 12 ], coatings [ 1 ], batteries [ 13 , 14 ] and printed electronics [ 15 , 16 ]. However, the progress of the devices mentioned above relies upon large-scale industrial production of graphene, which remains a major challenge [ 12 ].…”