New halogen/nitrogen dual-doped graphenes (X/N–G) with thermally tunable doping levels are synthesized via the thermal reduction of graphite oxide (GO) with stepwise-pyrolyzed ionic liquids. The doping process of halogen and nitrogen into the graphene lattice proceeds via substitutional or covalent bonding through the physisorption or chemisorption of in situ pyrolyzed dopant precursors. The doping process is performed by heating to 300–400 °C of ionic liquid, and the chemically assisted reduction of GO is facilitated by ionic iodine, resulting in I/N–G materials possessing about three and two orders of magnitude higher conductivity (∼22 200 S m −1 ) and charge carrier density (∼10 21 cm −3 ), compared to those of thermally reduced GO. The thermally tunable doping levels of halogen in X/N–G significantly increase the conductivity of doped graphene to ∼27 800 S m −1 .
Ok-Kyung Park, Hyun Joo Kim, Jun Yeon Hwang, Dong Su Lee, Jahyun Koo, Hoonkyung Lee, Jong-Sung Yu, Bon-Cheol Ku and Jae Kwan Lee
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Ok-Kyung Park, Hyun Joo Kim, Jun Yeon Hwang, Dong Su Lee, Jahyun Koo, Hoonkyung Lee, Jong-Sung Yu, Bon-Cheol Ku and Jae Kwan Lee
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A large part of Alfa Chemistry's customers are pharmaceutical and biotechnology companies, including Pfizer, Novartis, Merck & Co., Johnson & Johnson, AstraZeneca, and Bayer. Alfa Chemistry is also a preferred partner for many universities and non-profit institutes. 1-propyl-2,3-methylimidazolium perfluorobutanesulfonate
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