Bandgap Widening of Phase Quilted, 2D MoS<sub>2</sub> by Oxidative Intercalation

Song, Suhee; Kim, Bo Hyun; Choe, Duk‐Hyun; Kim, Jin; Kim, Dae Chul; Lee, Dong Ju; Kim, Jung Mo; Chang, Kee Joo; Jeon, Seokwoo

doi:10.1002/adma.201500649

Cited by 80 publications

(67 citation statements)

References 50 publications

(64 reference statements)

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“…The formation of MoS 2-x O x solid solution phase has already been proposed for sputter deposited MoS 2 films 37,38 ,39 . However, so far the structure of the synthesized molybdenum oxy-sulfide films was found to be amorphous or highly disordered with poor long-range crystalline order 40,41 . Here we provide clear evidence for the formation of a highly crystalline 2D molybdenum oxy-sulfide phase and thus a strategy for synthesizing new materials through chemical transformation of 2D crystals that are difficult to synthesize by other methods.…”

Section: Ambient Oxidation Of the Basal Plane Revealed At Single-atommentioning

confidence: 99%

Spontaneous doping of the basal plane of MoS2 single layers through oxygen substitution under ambient conditions

et al. 2018

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The chemical inertness of the defect-free basal plane confers environmental stability to MoS single layers, but it also limits their chemical versatility and catalytic activity. The stability of pristine MoS basal plane against oxidation under ambient conditions is a widely accepted assumption however, here we report single-atom-level structural investigations that reveal that oxygen atoms spontaneously incorporate into the basal plane of MoS single layers during ambient exposure. The use of scanning tunnelling microscopy reveals a slow oxygen-substitution reaction, during which individual sulfur atoms are replaced one by one by oxygen, giving rise to solid-solution-type 2D MoSO crystals. Oxygen substitution sites present all over the basal plane act as single-atom reaction centres, substantially increasing the catalytic activity of the entire MoS basal plane for the electrochemical H evolution reaction.

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Section: Ambient Oxidation Of the Basal Plane Revealed At Single-atommentioning

confidence: 99%

Spontaneous doping of the basal plane of MoS2 single layers through oxygen substitution under ambient conditions

et al. 2018

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“…An important caveat in this analysis is that some band energies used here are those of bulk crystals, while band structures of actual 2D materials will be affected by other factors such as doping, exfoliation (thickness dependence), and compressive strain. 326–330 …”

Section: Fundamental Modes Of Biological Interactionmentioning

confidence: 99%

“…27, 110, 112, 124, 215, 326, 339 Here we focus on chemical transformations with the goal of identifying the material forms that will play the most important roles in the natural environment. This issue is informed by a decade of research on the environmental implications of particulate and 1D nanomaterials 340, 341 plus significant data on the environmental chemistry of natural 2D materials.…”

Section: Chemical Transformations In the Natural Environmentmentioning

confidence: 99%

Biological and environmental interactions of emerging two-dimensional nanomaterials

Wang¹,

Zhu²,

Qiu³

et al. 2016

Chem. Soc. Rev.

233

210

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Two-dimensional materials have become a major focus in materials chemistry research worldwide with substantial efforts centered on synthesis, property characterization, and technological application. These high-aspect ratio sheet-like solids come in a wide array of chemical compositions, crystal phases, and physical forms, and are anticipated to enable a host of future technologies in areas that include electronics, sensors, coatings, barriers, energy storage and conversion, and biomedicine. A parallel effort has begun to understand the biological and environmental interactions of synthetic nanosheets, both to enable the biomedical developments and to ensure human health and safety for all application fields. This review covers the most recent literature on the biological responses to 2D materials and also draws from older literature on natural lamellar minerals to provide additional insight into the essential chemical behaviors. The article proposes a framework for more systematic investigation of biological behavior in the future, rooted in fundamental materials chemistry and physics. That framework considers three fundamental interaction modes: (i) chemical interactions and phase transformations, (ii) electronic and surface redox interactions, and (iii) physical and mechanical interactions that are unique to near-atomically-thin, high-aspect-ratio solids. Two-dimensional materials are shown to exhibit a wide range of behaviors, which reflect the diversity in their chemical compositions, and many are expected to undergo reactive dissolution processes that will be key to understanding their behaviors and interpreting biological response data. The review concludes with a series of recommendations for high-priority research subtopics at the “bio-nanosheet” interface that we hope will enable safe and successful development of technologies related to two-dimensional nanomaterials.

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“…The material has the sheet structure with an average lateral size of about 300 nm as determined by dynamic light scattering (DLS) method (Figure B). The corresponding high‐resolution transmission electron microscopy (HR‐TEM) image (Figure C) confirmed that both MoS 2 and Bi 2 S 3 crystal lattices existed in the nanosheets, where 0.34 nm and 0.27 nm belong to the (130) plane of Bi 2 S 3 and the (101) plane of MoS 2 , respectively . Elemental distribution mappings further illustrate the co‐existence of Mo and Bi elements (Figure D).…”

Section: Figurementioning

confidence: 65%

Molybdenum–Bismuth Bimetallic Chalcogenide Nanosheets for Highly Efficient Electrocatalytic Reduction of Carbon Dioxide to Methanol

et al. 2016

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Methanol is av ery useful platform molecule and liquid fuel. Electrocatalytic reduction of CO 2 to methanol is apromising route,whichcurrently suffers from low efficiency and poor selectivity.H erein we report the first work to use aM o-Bi bimetallic chalcogenide (BMC) as an electrocatalyst for CO 2 reduction. By using the Mo-Bi BMC on carbon paper as the electrode and 1-butyl-3-methylimidazolium tetrafluoroborate in MeCN as the electrolyte,t he Faradaic efficiency of methanol could reach 71.2 %w ith ac urrent density of 12.1 mA cm À2 ,w hichi sm uchh igher than the best result reported to date.T he superior performance of the electrode resulted from the excellent synergistic effect of Mo and Bi for producing methanol. The reaction mechanism was proposed and the reason for the synergistic effect of Mo and Bi was discussed on the basis of some control experiments.This work opens away to produce methanol efficiently by electrochemical reduction of CO 2 .CO 2 is acheap,abundant, and safe carbon resource,and its transformation into valuable chemicals and fuel has received much attention.[1,2] CO 2 conversion can be achieved by chemical methods,e lectrochemical reduction, and photocatalytic reduction. [3,4] Theelectrochemical reaction system is compact, modular, and the efficiencycan be easily controlled by different parameters,s uch as electrode materials,e lectrolytes,and applied potentials.[5] Theelectrochemical reduction of CO 2 can proceed through two-, four-, six-, and eightelectron reduction pathways in different electrolytes over metals,metal complexes,and non-metallic electrodes,and the major products are CO, [6][7][8][9] formic acid/formate,

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Bandgap Widening of Phase Quilted, 2D MoS₂ by Oxidative Intercalation

Cited by 80 publications

References 50 publications

Spontaneous doping of the basal plane of MoS2 single layers through oxygen substitution under ambient conditions

Spontaneous doping of the basal plane of MoS2 single layers through oxygen substitution under ambient conditions

Biological and environmental interactions of emerging two-dimensional nanomaterials

Molybdenum–Bismuth Bimetallic Chalcogenide Nanosheets for Highly Efficient Electrocatalytic Reduction of Carbon Dioxide to Methanol

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Bandgap Widening of Phase Quilted, 2D MoS2 by Oxidative Intercalation

Cited by 80 publications

References 50 publications

Spontaneous doping of the basal plane of MoS2 single layers through oxygen substitution under ambient conditions

Spontaneous doping of the basal plane of MoS2 single layers through oxygen substitution under ambient conditions

Biological and environmental interactions of emerging two-dimensional nanomaterials

Molybdenum–Bismuth Bimetallic Chalcogenide Nanosheets for Highly Efficient Electrocatalytic Reduction of Carbon Dioxide to Methanol

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Bandgap Widening of Phase Quilted, 2D MoS₂ by Oxidative Intercalation