Plasmon Resonances of Highly Doped Two-Dimensional MoS<sub>2</sub>

Wang, Yichao; Ou, Jian Zhen; Chrimes, Adam F.; Carey, Benjamin J.; Daeneke, Torben; Alsaif, Manal M. Y. A.; Mortazavi, Majid; Zhuiykov, Serge; Medhekar, Nikhil V.; Bhaskaran, Madhu; Friend, James; Strano, Michael S.; Kalantar‐zadeh, Kourosh

doi:10.1021/nl503563g

Cited by 169 publications

(138 citation statements)

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“…Sub‐band gap absorption can be originated from other effect such as sample impurities or scattering . Next we assign the visible‐NIR absorption peaks to LSPR by the strong dependence of plasmon resonance wavelength on the varied solvent medium.…”

Section: Figurementioning

confidence: 82%

“…Therefore it can be concluded that the LSPR is easily influenced by the effective local medium index. In these cases, the obtained MoO 3− x nanodots dispersed in different solvent can be viewed as a molecule sensing system, and the LSPR properties can be effected by the affinity between MoO 3− x nanodots and solvent molecules, not only the refractive index as reported in the literature …”

Section: Figurementioning

confidence: 99%

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Room‐temperature Synthesis of Amorphous Molybdenum Oxide Nanodots with Tunable Localized Surface Plasmon Resonances

Zhu

et al. 2017

Chemistry An Asian Journal

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Two-dimensional (2D) semiconductors have recently emerged as a remarkable class of plasmonic alternative to conventional noble metals. However, tuning of their plasmonic resonances towards different wavelengths in the visible-light region with physical or chemical methods still remains challenging. In this work, we design a simple room-temperature chemical reaction route to synthesize amorphous molybdenum oxide (MoO ) nanodots that exhibit strong localized surface plasmon resonances (LSPR) in the visible and near-infrared region. Moreover, tunable plasmon resonances can be achieved in a wide range with the changing surrounding solvent, and accordingly the photoelectrocatalytic activity can be optimized with the varying LSPR peaks. This work boosts the light-matter interaction at the nanoscale and could enable photodetectors, sensors, and photovoltaic devices in the future.

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Section: Figurementioning

confidence: 82%

Section: Figurementioning

confidence: 99%

Room‐temperature Synthesis of Amorphous Molybdenum Oxide Nanodots with Tunable Localized Surface Plasmon Resonances

Zhu

et al. 2017

Chemistry An Asian Journal

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“…Indeed, at zero temperature and in the absence of doping, graphene, MoS 2 , and BP do not support plasmons. However, these excitations are activated by introducing additional charge carriers, which can be done through chemical doping [12], molecular physisorption [13], and electrostatic gating [14,15]. The latter is useful for electrically controlling plasmons, relying, for example, on a bottom-gate configuration, as depicted in the upper inset of Fig.…”

Section: Introductionmentioning

confidence: 99%

Nonlocal plasmonic response of doped and optically pumped graphene, MoS2 , and black phosphorus

2017

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Plasmons in two-dimensional (2D) materials have emerged as a new source of physical phenomena and optoelectronic applications due in part to the relatively small number of charge carriers on which they are supported. Unlike conventional plasmonic materials, they possess a large Fermi wavelength, which can be comparable with the plasmon wavelength, thus leading to unusually strong nonlocal effects. Here, we study the optical response of a selection of 2D crystal layers (graphene, MoS 2 , and black phosphorus) with inclusion of nonlocal and thermal effects. We extensively analyze their plasmon dispersion relations and focus on the Purcell factor for the decay of an optical emitter in close proximity to the material as a way to probe nonlocal and thermal effects, with emphasis placed on the interplay between temperature and doping. The results are based on tight-binding modeling of the electronic structure combined with the random-phase approximation response function in which the temperature enters through the Fermi-Dirac electronic occupation distribution. Our study provides a route map for the exploration and exploitation of the ultrafast optical response of 2D materials.

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“…The estimated sheet resistances were on the order of 10 5 , 10 8 , and 10 9 Ω/sq for WO 3-x , WSe 2 , and WO 3 , respectively, in good agreement with the MIM results. The high local conductivity in the partially oxidized regions, as shown by both the MIM and transport data, could lead to other interesting phenomena such as the plasmonic resonance reported in TMDC materials [31].We now turn to the compositional analysis of oxidized WSe 2 using time-of-flight secondary ion mass spectroscopy (ToF-SIMS), a sample-destructive method that provides 3D elemental information of materials. Fig.…”

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confidence: 99%

Thermal Oxidation of WSe₂ Nanosheets Adhered on SiO₂/Si Substrates

et al. 2015

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Due to the drastically different intralayer versus interlayer bonding strengths, the mechanical, thermal, and electrical properties of two-dimensional (2D) materials are highly anisotropic between the in-plane and out-of-plane directions. The structural anisotropy may also play a role in chemical reactions, such as oxidation, reduction, and etching. Here, the composition, structure, and electrical properties of mechanically exfoliated WSe 2 nanosheets on SiO 2 /Si substrates were studied as a function of the extent of thermal oxidation. A major component of the oxidation, as indicated from optical and Raman data, starts from the nano-sheet edges and propagates laterally towards the center. Partial oxidation also occurs in certain areas at the surface of the flakes, which are shown to be highly conductive by microwave impedance microscopy. Using secondary ion mass spectroscopy, we also observed extensive oxidation at the WSe 2 −SiO 2 interface. The combination of multiple microcopy methods can thus provide vital information on the spatial evolution of chemical reactions on 2D materials and the nanoscale electrical properties of the reaction products.Keywords: Tungsten diselenide, 2D materials, thermal oxidation, microwave impedance microscopy, secondary ion mass spectroscopy 2 Layered van der Waals (vdW) materials, in which the electronic properties are inherently anisotropic, have been studied for a relatively long time [1], and have also attracted renewed interest in recent years [1,2]. This family of materials include elemental atomic sheets (e.g.,, and phosphorene [6,7]) and transition metal dichalcogenides [8] (TMDCs, e.g., MoS 2 and WSe 2 ), among others, presenting a wide array of candidates for research and applications. Given the extensive knowledge obtained on the solidstate chemistry of conventional Group IV elemental semiconductors and III-V compounds, and the potential use of vdW materials in nanoelectronics, it is anticipated that much effort will be devoted to investigate the spatial and temporal evolution of various chemical reactions [9], such as solution or vapor-based synthesis, reduction and oxidation, wet and dry etching, in 2D materials. Specifically, the understanding of these processes from atomic to mesoscopic length scales will provide important insight on their performance at the device level.The oxidation process of TMDCs is of particular interest due to its strong influence on the characteristics of devices that are not hermetically sealed and could potentially be oxidized in ambient environments. In addition, the fully oxidized products, e.g., WO 3 , are semiconducting metal oxides with a band gap in the range of 2.5 -3.7 eV, which may find applications in many areas [10][11][12]. To date, the oxidation of TMDCs has been studied at elevated temperatures [13], under intense laser illumination [14], and upon exposure to oxygen plasma [15] or ozone [16]. In contrast to conventional semiconductors such as silicon, the TMDCs show larger oxidative reactivity at the edges and surfac...

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Plasmon Resonances of Highly Doped Two-Dimensional MoS₂

Cited by 169 publications

References 49 publications

Room‐temperature Synthesis of Amorphous Molybdenum Oxide Nanodots with Tunable Localized Surface Plasmon Resonances

Room‐temperature Synthesis of Amorphous Molybdenum Oxide Nanodots with Tunable Localized Surface Plasmon Resonances

Nonlocal plasmonic response of doped and optically pumped graphene, MoS2 , and black phosphorus

Thermal Oxidation of WSe₂ Nanosheets Adhered on SiO₂/Si Substrates

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Plasmon Resonances of Highly Doped Two-Dimensional MoS2

Cited by 169 publications

References 49 publications

Room‐temperature Synthesis of Amorphous Molybdenum Oxide Nanodots with Tunable Localized Surface Plasmon Resonances

Room‐temperature Synthesis of Amorphous Molybdenum Oxide Nanodots with Tunable Localized Surface Plasmon Resonances

Nonlocal plasmonic response of doped and optically pumped graphene, MoS2 , and black phosphorus

Thermal Oxidation of WSe2 Nanosheets Adhered on SiO2/Si Substrates

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Product

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Plasmon Resonances of Highly Doped Two-Dimensional MoS₂

Thermal Oxidation of WSe₂ Nanosheets Adhered on SiO₂/Si Substrates