One‐Step Simultaneous Exfoliation and Covalent Functionalization of MoS2 by Amino Acid Induced Solution Processes. Issue 3 (22nd February 2017)

• Record Type: Journal Article
• Authors: Satheeshkumar, Elumalai; Bandyopadhyay, Arkamita; Sreedhara, M. B.; Pati, Swapan K.; Rao, C. N. R.; Yoshimura, Masahiro
• Is Part Of: ChemNanoMat. Volume 3:Issue 3(2017)
• Page Start: 172
• Page End: 177
• Publication Date: 2017-02-22
• Subjects: amino acids -- biocompatibility -- covalent functionalization -- liquid phase exfoliation -- molybdenum disulfide; Nanochemistry -- Periodicals; Nanostructured materials -- Periodicals; Nanochemistry; Nanostructured materials; Periodicals; 541.2
• DOI: 10.1002/cnma.201600363
• Languages: English
• ISSNs: 2199-692X

Abstract

Abstract: The covalent functionalization of transition metal dichalcogenides (TMDs) has attracted significant interest because of their novel physicochemical properties for various applications. Herein, we report on amino acid (AA)‐induced solution‐processed simultaneous exfoliation and in situ covalent functionalization of exfoliated molybdenum disulfide (MoS2 ). Covalent functionalization of MoS2 with AAs was experimentally validated by various spectrochemical characterization and density functional theory calculations. We find that N terminal binding (NH2 ) of AAs with sulfur defects on exfoliated MoS2 is much more favorable than the C terminal binding (COOH). Notably, the MoS2 flakes have significantly improved biocompatibility with normal intestinal epithelial cell‐6. This exfoliation technique is presented here as general strategy; it is not limited to MoS2 and may apply to exfoliating other MX2 compounds of TMDs. Abstract : The simultaneous exfoliation and in situ covalent functionalization of amino acids (AAs) on few‐layered MoS2 flakes has been developed using AAs as exfoliating agents. The various spectrochemical characterization methods suggest that covalent N‐terminal binding (NH2 ) of AAs occurs with sulfur defects on exfoliated MoS2 in one‐step.