TY - JOUR
T1 - Direct Covalent Chemical Functionalization of Unmodified Two-Dimensional Molybdenum Disulfide
AU - Chu, Ximo S.
AU - Yousaf, Ahmed
AU - Li, Duo O.
AU - Tang, Anli A.
AU - Debnath, Abhishek
AU - Ma, Duo
AU - Green, Alexander
AU - Santos, Elton J.G.
AU - Wang, Qing
N1 - Funding Information:
We gratefully acknowledge the use of facilities at the LeRoy Eyring Center for Solid State Science at Arizona State University and Dr. Tim Karcher for assistance with XPS and TGA measurements; the Keck Bioimaging Lab at ASU and Dr. Page Baluch for assistance with confocal imaging; Prof. Hao Yan for use of the AFM and Raman systems, and Dr. Shuoxing Jiang for assistance with AFM measurements, and Dr. Su Lin for assistance with Raman measurements. X.S.C., A.Y., Q.H.W., and A.A.G. acknowledge support from ASU startup funds and NSF grant DMR-1610153. A.A.G. acknowledges an Alfred P. Sloan Research Fellowship (FG-2017-9108), an NIH Director’s New Innovator Award (1DP2GM126892), and an Arizona Biomedical Research Commission New Investigator Award (ADHS16-162400). E.J.G.S. acknowledges the use of computational resources from the UK National Supercomputing Service, ARCHER, for which access was obtained via the UKCP consortium and funded by EPSRC grant EP/K013564/ 1; the Extreme Science and Engineering Discovery Environment (XSEDE), supported by NSF grants TG-DMR120049 and TG-DMR150017, and the UK Materials and Molecular Modeling Hub for access to THOMAS supercluster, which is partially funded by EPSRC (EP/P020194/1). E.J.G.S. also acknowledges the Queen's Fellow Award through the startup grant number M8407MPH, the Enabling Fund (QUB, A5047TSL), and the Department for the Economy (USI 097).
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/3/27
Y1 - 2018/3/27
N2 - Two-dimensional semiconducting transition metal dichalcogenides (TMDCs) like molybdenum disulfide (MoS2) are generating significant excitement due to their unique electronic, chemical, and optical properties. Covalent chemical functionalization represents a critical tool for tuning the properties of TMDCs for use in many applications. However, the chemical inertness of semiconducting TMDCs has thus far hindered the robust chemical functionalization of these materials. Previous reports have required harsh chemical treatments or converting TMDCs into metallic phases prior to covalent attachment. Here, we demonstrate the direct covalent functionalization of the basal planes of unmodified semiconducting MoS2 using aryl diazonium salts without any pretreatments. Our approach preserves the semiconducting properties of MoS2, results in covalent C-S bonds, is applicable to MoS2 derived from a range of different synthesis methods, and enables a range of different functional groups to be tethered directly to the MoS2 surface. Using density functional theory calculations including van der Waals interactions and atomic-scale scanning probe microscopy studies, we demonstrate a novel reaction mechanism in which cooperative interactions enable the functionalization to propagate along the MoS2 basal plane. The flexibility of this covalent chemistry employing the diverse aryl diazonium salt family is further exploited to tether active proteins to MoS2, suggesting future biological applications and demonstrating its use as a versatile and powerful chemical platform for enhancing the utility of semiconducting TMDCs.
AB - Two-dimensional semiconducting transition metal dichalcogenides (TMDCs) like molybdenum disulfide (MoS2) are generating significant excitement due to their unique electronic, chemical, and optical properties. Covalent chemical functionalization represents a critical tool for tuning the properties of TMDCs for use in many applications. However, the chemical inertness of semiconducting TMDCs has thus far hindered the robust chemical functionalization of these materials. Previous reports have required harsh chemical treatments or converting TMDCs into metallic phases prior to covalent attachment. Here, we demonstrate the direct covalent functionalization of the basal planes of unmodified semiconducting MoS2 using aryl diazonium salts without any pretreatments. Our approach preserves the semiconducting properties of MoS2, results in covalent C-S bonds, is applicable to MoS2 derived from a range of different synthesis methods, and enables a range of different functional groups to be tethered directly to the MoS2 surface. Using density functional theory calculations including van der Waals interactions and atomic-scale scanning probe microscopy studies, we demonstrate a novel reaction mechanism in which cooperative interactions enable the functionalization to propagate along the MoS2 basal plane. The flexibility of this covalent chemistry employing the diverse aryl diazonium salt family is further exploited to tether active proteins to MoS2, suggesting future biological applications and demonstrating its use as a versatile and powerful chemical platform for enhancing the utility of semiconducting TMDCs.
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U2 - 10.1021/acs.chemmater.8b00173
DO - 10.1021/acs.chemmater.8b00173
M3 - Article
AN - SCOPUS:85044650004
SN - 0897-4756
VL - 30
SP - 2112
EP - 2128
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 6
ER -