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High-quality graphene via microwave reduction of solution-exfoliated graphene oxide
Voiry, Damien,Yang, Jieun,Kupferberg, Jacob,Fullon, Raymond,Lee, Calvin,Jeong, Hu Young,Shin, Hyeon Suk,Chhowalla, Manish American Association for the Advancement of Scienc 2016 Science Vol.353 No.6306
<P>Efficient exfoliation of graphite in solutions to obtain high-quality graphene flakes is desirable for printable electronics, catalysis, energy storage, and composites. Graphite oxide with large lateral dimensions has an exfoliation yield of similar to 100%, but it has not been possible to completely remove the oxygen functional groups so that the reduced form of graphene oxide (GO; reduced form: rGO) remains a highly disordered material. Here we report a simple, rapid method to reduce GO into pristine graphene using 1- to 2-second pulses of microwaves. The desirable structural properties are translated intomobility values of >1000 square centimeters per volt per second in field-effect transistors with microwave-reduced GO (MW-rGO) as the channel material and into particularly high activity for MW-rGO catalyst support toward oxygen evolution reactions.</P>
Phase-engineered transition-metal dichalcogenides for energy and electronics
Chhowalla, Manish,Voiry, Damien,Yang, Jieun,Shin, Hyeon Suk,Loh, Kian Ping Cambridge University Press (Materials Research Soc 2015 MRS bulletin Vol.40 No.7
<▼1><B>Abstract</B><P/></▼1><▼2><P>Two-dimensional (2D) transition-metal dichalcogenides (TMDs) consist of over 40 compounds. Complex metal TMDs assume the 1T phase where the transition-metal atom coordination is octahedral. The 2H phase is stable in semiconducting TMDs where the coordination of metal atoms is trigonal prismatic. Stability issues have hampered the study of interesting phenomena in two-dimensional 1T phase TMDs. Phase conversion in TMDs involves transformation by chemistry at room temperature and pressure. It is possible to convert 2H phase 2D TMDs to the 1T phase or locally pattern the 1T phase on the 2H phase. The chemically converted 1T phase 2D TMDs exhibit interesting properties that are being exploited for catalysis, source and drain electrodes in field-effect transistors, and energy storage. We summarize the key properties of 2D 1T phase TMDs and their applications as electrodes for energy and electronics.</P></▼2>
Yang, Jieun,Voiry, Damien,Ahn, Seong Joon,Kang, Dongwoo,Kim, Ah Young,Chhowalla, Manish,Shin, Hyeon Suk WILEY‐VCH Verlag 2013 Angewandte Chemie Vol.125 No.51
<P><B>Kompositmaterialien</B>: Nanoblätter aus Wolfram(IV)sulfid sowie aus WS<SUB>2</SUB> auf reduziertem Graphenoxid (WS<SUB>2</SUB>/rGO) wurden aus Wolframchlorid, Thioacetamid und Graphenoxid (GO) durch Hydrothermalsynthese hergestellt. Die WS<SUB>2</SUB>/rGO‐Hybridnanoblätter zeigen eine viel besser elektrokatalytische Aktivität in der Wasserstoffentwicklung (siehe Bild) als die reinen WS<SUB>2</SUB>‐Nanoblätter.</P>