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Reaction with organic halides as a general method for the covalent functionalization of nanosheets of 2D chalcogenides and related materials

Published online by Cambridge University Press:  13 June 2017

S. Manjunatha ,
S. Rajesh ,
Pratap Vishnoi  and
C.N.R. Rao
S. Manjunatha
Affiliation:
New Chemistry Unit, International Centre for Materials Science and Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
S. Rajesh
Affiliation:
New Chemistry Unit, International Centre for Materials Science and Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
Pratap Vishnoi
Affiliation:
New Chemistry Unit, International Centre for Materials Science and Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
C.N.R. Rao*
Affiliation:
New Chemistry Unit, International Centre for Materials Science and Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
*
a) Address all correspondence to this author. e-mail: cnrrao@jncasr.ac.in
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Abstract

Prompted by the success in functionalizing 2D sheets of MoS2 and MoSe2 by their reaction with organic halides, we have investigated the functionalization of layered tungsten chalcogenides, WS2, WSe2, and WTe2, by their reaction with substituted iodobenzenes as well as fluorophores based on pyrene and coumarin. Carbon–chalcogenide bonds are formed readily in the case of metallic chalcogenides while there is need for the Pd(0) catalysts in the case of insulating chalcogenides. Thus, the formation of carbon–chalcogen (S, Se, and Te) bonds is accomplished with the metallic 1T as well as the semiconducting 2H phases of the tungsten chalcogenides. Functionalization in the case of substituted iodobenzenes is favored by the electron withdrawing groups in the benzene ring. Interestingly, functionalization has been successful with other insulating layered chalcogenides such as GaS and GaSe. Reaction with organic halides emerges as a general method for the covalent functionalization of chalcogenide nanosheets, suggesting the possible use of this strategy to functionalize various chalcogenide structures.

Keywords

chemical substitutionluminescencesemiconducting

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Type
Invited Articles
Information
Journal of Materials Research , Volume 32 , Issue 15: Focus Issue: Two-Dimensional Nanomaterials for Biosensors , 14 August 2017 , pp. 2984 - 2992
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Venkatesan Renugopalakrishnan

References

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