Journal
2D MATERIALS
Volume 4, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aa8358
Keywords
amine modified polymers; lewis acid-base interaction; transition metal dichalcogenides; liquid-phase exfoliation; visible-light photodetectors
Categories
Funding
- Stage of the Brain Korea 21 Plus Project
- National Research Foundation of Korea (NRF) grant - Korea government (MEST) [2014R1A2A1A01005046]
- Ministry of Trade, Industry & Energy (MOTIE, Korea) under Industrial Technology Innovation Program [10063274]
- Air Force Office of Scientific Research [FA2386-16-1-4058]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10063274] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2014R1A2A1A01005046, 2017R1A2A1A05001160, 2013H1A2A1033524] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Liquid-phase exfoliation (LPE) of transition metal dichalcogenide (TMD) nanosheets is a facile, cost-effective approach to large-area photoelectric devices including photodetectors and non-volatile memories. Non-destructive exfoliation of nanosheets using macromolecular dispersing agents is beneficial in rendering the TMD nanocomposite films suitable for mechanically flexible devices. Here, an efficient LPE of molybdenum disulfide (MoS2) with an amine modified poly(styrene-co-maleic anhydride) co-polymer (AM-PSMA) is demonstrated, wherein the maleic anhydrides were converted into maleic imides with primary amines using N-Boc-(CH2)(n)-NH2. The exfoliation of nanosheets was facilitated through Lewis acid-base interaction between the primary amine and transition metal. The results demonstrate that the exfoliation depends upon both the fraction of primary amines in the polymer chain and their distance from the polymer backbone. Under optimized conditions of primary amine content and its distance from the backbone, AM-PSMA gave rise to a highly concentrated MoS2 nanosheet suspension that was stable for over 10 d. Exfoliation of several other TMDs was also achieved using the optimized AM-PSMA, indicating the scope of AM-PSMA applications. Furthermore, a flexible composite film of AM-PSMA and MoS2 nanosheets fabricated by vacuum-assisted filtration showed excellent photoconductive performances including a high I-on/I-off ratio of 10(2) and a fast photocurrent switching of 300 ms.
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