@article{42,
  keywords = {Graphene Oxide Femto-Gel Development},
  author = {Khaled Ibrahim and Mehrdad Irannejad and Benjamin Wales and Joseph Sanderson and Kevin Musselman and Mustafa Yavuz},
  title = {The effect of varying ultrafast pulse laser energies on the electrical properties of reduced graphene oxide sheets in solution},
  abstract = {<p>Laser treatment of graphene oxide solution among other techniques is a well-established technique for producing reduced graphene sheets. However, production of high-quality ultra-low sheet resistance reduced graphene oxide (rGO) sheets in solution has been a challenge due to their high degree of randomness, defect-rich medium, and lack of controlability. Recent studies lack an in-depth analytic comparison of laser treatment parameters that yield the highest quality rGO sheets with a low defect ratio. Hence, in this study, we implement a comprehensive comparison of laser treatment parameters and their effect on the yielded rGO sheets from an electronic and physical standpoint. Ultra-low sheet resistance graphene oxide sheets were fabricated using ultrafast laser irradiation with different laser pulse energies in the range of 0.25–2&nbsp;mJ. Laser treatment for 10&nbsp;min using a pulse energy of 1&nbsp;mJ resulted in an increase in the defect spacing, accompanied by a large red shift in the optical absorption of the C=C bond, indicating significant restoration of the s<em>p</em>&nbsp;<sup>2</sup>&nbsp;carbon bonds. These enhancements resulted in a significant reduction in the electrical resistance of the rGO flakes (up to 2 orders of magnitude), raising the electron mobility of the films produced using the irradiated graphene oxide a step closer to that of pristine graphene films. From this study, we can also deduce which exposure regimes result in the fabrication of quantum dots and continuous defect-free films.</p>
},
  year = {2018},
  journal = {Journal of Electronic Materials},
  volume = {47},
  chapter = {1117-1124},
  month = { 2018/2},
  url = {https://link.springer.com/article/10.1007/s11664-017-5866-1},
  doi = {10.1007/s11664-017-5866-1},
}