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              –v criticality in gauged supergravities

Li, Shou-Long; Lyu, Hong-Da; Deng, Hua-Kai; Hao, Wei

doi:10.1140/epjc/s10052-019-6710-y

Cited by 17 publications

(14 citation statements)

References 44 publications

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“…6a-b, which gives a bulk FoM≈ 113.9 (11.7). Note that the bulk FoMs calculated using either inelastic damping rate provide large values compared to others found in the literature [40,41].…”

mentioning

confidence: 72%

Analytical Modeling of Graphene Plasmons

Cox

Saavedra

et al. 2017

ACS Photonics

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The two-dimensionality of graphene and other layered materials can be exploited to simplify the theoretical description of their plasmonic and polaritonic modes. We present an analytical theory that allows us to simulate these excitations in terms of plasmon wave functions (PWFs). Closed-form expressions are offered for their associated extinction spectra, involving only two real parameters for each plasmon mode and graphene morphology, which we calculate and tabulate once and for all. Classical and quantum-mechanical formulations of this PWF formalism are introduced, in excellent mutual agreement for armchaired islands with > 10 nm characteristic size. Examples of application are presented to predict both plasmon-induced transparency in interacting nanoribbons and excellent sensing capabilities through the response to the dielectric environment. We argue that the PWF formalism has general applicability and allows us to analytically describe a wide range of 2D polaritonic behavior, thus facilitating their use for the design of actual devices. Plasmons are collective oscillations of conduction electrons found in different materials, where they interact strongly with light and can confine it down to nanoscale spatial regions to generate enormous optical field intensity enhancement [1]. These extraordinary properties are of paramount importance for a wide range of applications, such as optical sensing and modulation [2][3][4][5][6], the enhancement of nonlinear optical processes [7,8], photocatalysis [9][10][11][12][13][14], and photothermal therapies [15,16]. In these applications, precise spectral positioning of plasmon resonances is needed to achieve optimal performance. This is commonly achieved by fabricating noble metal nanostructures with specific sizes and morphologies. However, despite being the workhorse of plasmonics research, noble metals unfortunately present relatively large inelastic losses, thus limiting plasmon lifetimes in metallic nanostructures [17] and leading to a severe reduction in optical confinement. Additionally, the large number of electrons involved in the plasmons of metallic nanostructures limits the ways in which we can influence them in a dynamical fashion.Recently, highly-doped graphene has emerged as an outstanding plasmonic material [18][19][20][21][22][23][24][25][26][27][28][29][30][31] that simultaneously provides strong field confinement with relatively lower loss [32]. More importantly, plasmons in graphene are sustained by a small number of charge carriers compared to those of traditional noble metals, a property that makes them amenable to display new phenomena, including an unprecedented electro-optical response. Indeed, active tunability of the plasmon resonance frequency has been achieved via electrical gating [21][22][23][24][25][26][28][29][30]. Additionally, many of the aforementioned applications that were first realized using noble metal plasmons have now been realized using a tunable graphene platform [31][32][33][34]. However, the design of graphene-based plasmoni...

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confidence: 72%

Analytical Modeling of Graphene Plasmons

Cox

Saavedra

et al. 2017

ACS Photonics

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“…14,17 In the study of the chemical modification of polyamide 12 (PA12) through the reaction with a hydride-terminated PDMS, it was found that the mechanical properties and thermal stability of PA12 were enhanced. 18 Ying et al prepared the nylon-6-b-PDMS copolymer, which had good improvement in its surface properties. The notched impact strength of copolymer was improved by 200%.…”

Section: Introductionmentioning

confidence: 99%

Polydimethylsiloxane/monomer casting nylon copolymers: Preparation, flame‐retardant properties, and wear‐resistant properties

Lee

Yang

et al. 2019

J of Applied Polymer Sci

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In order to improve the toughness, wear resistance, and combustion properties of the monomer casting nylon (MC nylon) materials, the polydimethylsiloxane (PDMS) segment is bonded to the nylon molecular chain by copolymerization. PDMS/MC nylon copolymers are prepared via in situ anionic polymerization with macro‐activator based on PDMS terminated with hexamethylene diisocyanate. The effects of different macro‐activator content on the mechanical properties, water absorption, thermal stability, friction and wear properties, and combustion properties of the copolymers are characterized. The results show that the impact strength of the copolymer improves significantly (optimally increases by 2.6 times) and the water absorption rate decreases with the increase of PDMS content. The introduction of the silicon–oxygen structure reduces the peak heat release rate of copolymer materials (optimally decreases about 28.7%), while it promotes the decomposition of the system, resulting in a slight decrease in the thermal stability of the materials. Adding 5 wt % PDMS can decrease the wear loss of MC nylon from 6.2 mg of pure nylon to 1.6 mg. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48753.

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“…Such limited success can be attributed to the utilization of semiconductors, which leads to complex reaction processes and raises the following issues: [9,10,65] rapid surface recombination of photogenerated charge carriers, their photocorrosion in aqueous electrolytes, and kinetic imbalance between charge transport from the bulk semiconductor to the electrode/electrolyte interface and interfacial catalytic charge transfer (on the scale of several μs vs. several ms to s). [8] Thus, effective electrocatalysts for artificial photosynthesis should satisfy the follow-ing conditions: (1) high catalytic activity and selectivity for a targeted reaction, [53,54] (2) protection of an underlying semiconductor, [66][67][68][69] (3) rapid scavenging and effective storage of charge carriers for electrocatalysis, [70][71][72] and (4) passivation of surface recombination centers [59,63,73,74] (Figure 1f ). For PEC cells, the decoration of a photocathode and a photoanode with proper electrocatalysts might lead to an anodic and a cathodic shift of the HER and OER onset potentials, respectively, with a remarkably increased photocurrent density (Figure 1g).…”

Section: Electrocatalysts For Artificial Photosynthesismentioning

confidence: 99%

Tailored Assembly of Molecular Water Oxidation Catalysts on Photoelectrodes for Artificial Photosynthesis

et al. 2019

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Solar‐to‐chemical energy conversion, or so‐called artificial photosynthesis, is a promising technology enabling sustainable production and use of various chemical compounds such as H2, CO, CH4, HCOOH, CH3OH, and NH3. For practical applications, it is necessary to improve the interfacial properties of light‐harvesting semiconductors through modification with proper electrocatalysts, by trying to overcome their intrinsic limitations such as rapid recombination, sluggish reaction kinetics, and photocorrosion. Compared to their heterogeneous counterparts, molecular electrocatalysts have a higher catalytic activity and more flexibility in their design/synthesis and integration with semiconducting materials. In this article, we review recent efforts on the tailored assembly of molecular electrocatalysts to address the above issues for artificial photosynthesis, especially those for oxygen evolution reactions on semiconductor photoelectrodes for photoelectrochemical water oxidation. One can expect that the strategies and methods developed for the tailored assembly and integration of molecular electrocatalysts on water oxidation photoanodes can provide insights for the design and fabrication of various forms of photosynthetic devices due to the similarity between their underlying principles.

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$$\mathcal{P}$$ P –v criticality in gauged supergravities

Cited by 17 publications

References 44 publications

Analytical Modeling of Graphene Plasmons

Analytical Modeling of Graphene Plasmons

Polydimethylsiloxane/monomer casting nylon copolymers: Preparation, flame‐retardant properties, and wear‐resistant properties

Tailored Assembly of Molecular Water Oxidation Catalysts on Photoelectrodes for Artificial Photosynthesis

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