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The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets
Chhowalla, Manish,Shin, Hyeon Suk,Eda, Goki,Li, Lain-Jong,Loh, Kian Ping,Zhang, Hua Nature Publishing Group, a division of Macmillan P 2013 Nature chemistry Vol.5 No.4
Ultrathin two-dimensional nanosheets of layered transition metal dichalcogenides (TMDs) are fundamentally and technologically intriguing. In contrast to the graphene sheet, they are chemically versatile. Mono- or few-layered TMDs — obtained either through exfoliation of bulk materials or bottom-up syntheses — are direct-gap semiconductors whose bandgap energy, as well as carrier type (n- or p-type), varies between compounds depending on their composition, structure and dimensionality. In this Review, we describe how the tunable electronic structure of TMDs makes them attractive for a variety of applications. They have been investigated as chemically active electrocatalysts for hydrogen evolution and hydrosulfurization, as well as electrically active materials in opto-electronics. Their morphologies and properties are also useful for energy storage applications such as electrodes for Li-ion batteries and supercapacitors.
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>
Structural and quantum-state phase transition in van der Waals layered materials
Yang, Heejun,Kim, Sung Wng,Chhowalla, Manish,Lee, Young Hee Nature Publishing Group, a division of Macmillan P 2017 Nature physics Vol.13 No.10
<P>Van der Waals layered transition metal dichalcogenides can exist in many different atomic and electronic phases. Such diverse polymorphisms not only provide a route for investigating novel topological states, such as quantum spin Hall insulators, superconductors and Weyl semimetals, but may also have applications in fields ranging from electronic and optical/ quantum devices to electrochemical catalysis. And the methods for triggering robust phase transitions between polymorphs are evolving and diversifying-several growth processes, high-pressure/strain methods, and optical, electronic and chemical treatments have been developed. Here, we discuss recent progress on phase transitions and the related physics in layered materials, and demonstrate unique features compared with conventional solid-state materials.</P>
ROOM TEMPERATURE DEPOSITION OF SINGLE-WALLED CARBON NANOTUBE THIN FILMS
SEUNG YOL JEONG,BHARVIN PAREKH,VARUN GUPTA,GIOVANNI FANCHINI,MANISH CHHOWALLA 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.5
A simple method for direct deposition of single-walled carbon nanotube (SWNT) networks on flexible substrates at room temperature is reported. Deposition of thin films was carried out using a two-zone tube furnace where the nucleation and growth of SWNTs occur in vapor phase in the hot zone and condense onto substrates in the cold zone. Raman spectroscopy and scanning electron microscopy reveal individual, uniformly distributed SWNTs over large areas (several cm2). The coverage density of the SWNTs on flexible substrates can be controlled by the location of the substrates within the cold zone. The opto-electronic properties of the thin films indicated that they can be transparent and conducting with sheet resistances ranging from 4 to 21 kΩ/sq at corresponding transparencies of 51 to 87%, respectively.
Electron emission from arrays of carbon nanotubes/fibres
W. I. Milne,K. B. K. Teo,M. Chhowalla,G. A. J. Amaratunga,D. Pribat,P. Legagneux,G. Pirio,Vu Thien Binh,V. Semet 한국물리학회 2002 Current Applied Physics Vol.2 No.6
The overall aim of this work is to produce arrays of eld emitting microguns, based on carbon nanotubes, which can be utilised inthe manufacture of large area eld emitting displays, parallel e-beam lithography systems and electron sources for high frequency(MWCNTs) using a dc plasma technique and a Ni catalyst. We will discuss how the density of the carbon nanotube/bres can bevaried by reducing the deposition yield through nickel interaction with a diusion layer or by direct lithographic patterning of the Nicatalyst to precisely dene the position of each nanotube/bre. Details of the eld emission behaviour of the dierent arrays ofMWCNTS will also be presented.. 2002 Published by Elsevier Science B.V.
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>
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>