So, about six years ago, Christopher DiMarco, GSAS’19, designed and built a CVD growth system in which the amount of oxygen introduced during the deposition process could be carefully controlled.
Trace oxygen was eliminatedCurrent PhD students Xingzhou Yan and Jacob Amontree found that when trace oxygen was eliminated, CVD growth was much faster—and gave the same results every time.
They also studied the kinetics of oxygen-free CVD graphene growth and found that a simple model could predict growth rate over a range of different parameters, including gas pressure and temperature.
“We both became fascinated by graphene and its potential as undergraduates,” Amontree and Yan said.
Seeing this study finally come to fruition is a dream come true.”Team to develop a method to cleanly transfer their high-quality graphene to other functional substrates such as silicon.
So, about six years ago, Christopher DiMarco, GSAS’19, designed and built a CVD growth system in which the amount of oxygen introduced during the deposition process could be carefully controlled.
Trace oxygen was eliminated
Current PhD students Xingzhou Yan and Jacob Amontree found that when trace oxygen was eliminated, CVD growth was much faster—and gave the same results every time.
They also studied the kinetics of oxygen-free CVD graphene growth and found that a simple model could predict growth rate over a range of different parameters, including gas pressure and temperature.
“We both became fascinated by graphene and its potential as undergraduates,” Amontree and Yan said. “We conducted countless experiments and synthesized thousands of samples over the past four years of our PhDs. Seeing this study finally come to fruition is a dream come true.”
Team to develop a method to cleanly transfer their high-quality graphene to other functional substrates such as silicon.
The quality of the OF-CVD-grown samples proved virtually identical to that of exfoliated graphene. In collaboration with colleagues in Columbia’s physics department, their graphene displayed striking evidence for the fractional quantum Hall effect under magnetic fields, a quantum phenomenon that had previously only been observed in ultrahigh-quality, two-dimensional electrical systems.
From here, the team plans to develop a method to cleanly transfer their high-quality graphene from the metal growth catalyst to other functional substrates such as silicon — the final piece of the puzzle to take full advantage of this wonder material.
