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Search for "optical properties" in Full Text gives 425 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Thickness-dependent photoelectrochemical properties of a semitransparent Co3O4 photocathode

  • Malkeshkumar Patel and
  • Joondong Kim

Beilstein J. Nanotechnol. 2018, 9, 2432–2442, doi:10.3762/bjnano.9.228

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  • photoelectrochemical cell properties. Figure 2a shows the thickness-dependent transmittance (T) and absorbance (A) spectra of the Co3O4 samples. Interestingly, all the Co3O4 samples exhibited fair absorbance with semitransparent optical properties. Absorbance dominates the shorter wavelengths (λ = 300–500 nm) with
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Published 12 Sep 2018

ZnO-nanostructure-based electrochemical sensor: Effect of nanostructure morphology on the sensing of heavy metal ions

  • Marina Krasovska,
  • Vjaceslavs Gerbreders,
  • Irena Mihailova,
  • Andrejs Ogurcovs,
  • Eriks Sledevskis,
  • Andrejs Gerbreders and
  • Pavels Sarajevs

Beilstein J. Nanotechnol. 2018, 9, 2421–2431, doi:10.3762/bjnano.9.227

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  • optical properties of the nanostructured layer for the particular application without changing the actual substance. Contrary to the case of needle-shaped nanostructures, other types of ZnO nanostructures have been less investigated, whereby research on such structures could open the possibilities for
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Published 11 Sep 2018

Performance analysis of rigorous coupled-wave analysis and its integration in a coupled modeling approach for optical simulation of complete heterojunction silicon solar cells

  • Ziga Lokar,
  • Benjamin Lipovsek,
  • Marko Topic and
  • Janez Krc

Beilstein J. Nanotechnol. 2018, 9, 2315–2329, doi:10.3762/bjnano.9.216

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  • . Besides the optical properties, proper passivation techniques of textured interfaces are crucial to keep surface recombination velocities as low as possible and thus to maintain the good electrical properties of the device [8][9]. To design and optimize textures applied to the front and/or rear side of
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Published 28 Aug 2018

Metal–dielectric hybrid nanoantennas for efficient frequency conversion at the anapole mode

  • Valerio F. Gili,
  • Lavinia Ghirardini,
  • Davide Rocco,
  • Giuseppe Marino,
  • Ivan Favero,
  • Iännis Roland,
  • Giovanni Pellegrini,
  • Lamberto Duò,
  • Marco Finazzi,
  • Luca Carletti,
  • Andrea Locatelli,
  • Aristide Lemaître,
  • Dragomir Neshev,
  • Costantino De Angelis,
  • Giuseppe Leo and
  • Michele Celebrano

Beilstein J. Nanotechnol. 2018, 9, 2306–2314, doi:10.3762/bjnano.9.215

Graphical Abstract
  • platforms is almost two orders of magnitude higher than in isolated nanopillars. We also find sizeable THG with an emission yield comparable to that of SHG, which is unexpected since third-order nonlinear processes are commonly negligible in these systems [28][38]. The polarization-dependent optical
  • properties of this platform together with the SHG angular emission characteristics indicate an improvement in both pump coupling and emission efficiency. We hence obtain solid indications for the realization of a new class of nano-photonic platforms for nonlinear light manipulation at the nanoscale. Results
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Published 27 Aug 2018

Hierarchical heterostructures of Bi2MoO6 microflowers decorated with Ag2CO3 nanoparticles for efficient visible-light-driven photocatalytic removal of toxic pollutants

  • Shijie Li,
  • Wei Jiang,
  • Shiwei Hu,
  • Yu Liu,
  • Yanping Liu,
  • Kaibing Xu and
  • Jianshe Liu

Beilstein J. Nanotechnol. 2018, 9, 2297–2305, doi:10.3762/bjnano.9.214

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  • . Herein, Ag2CO3 nanoparticles were in situ formed on Bi2MoO6 microflowers to produce Ag2CO3/Bi2MoO6 heterostructures via a facile procedure. The morphologies, phases, chemical compositions, and optical properties of Ag2CO3/Bi2MoO6 were examined by multiple characterization techniques. The Ag2CO3/Bi2MoO6
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Published 27 Aug 2018

Lead-free hybrid perovskites for photovoltaics

  • Oleksandr Stroyuk

Beilstein J. Nanotechnol. 2018, 9, 2209–2235, doi:10.3762/bjnano.9.207

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Published 21 Aug 2018

Dumbbell gold nanoparticle dimer antennas with advanced optical properties

  • Janning F. Herrmann and
  • Christiane Höppener

Beilstein J. Nanotechnol. 2018, 9, 2188–2197, doi:10.3762/bjnano.9.205

Graphical Abstract
  • ] and theoretical studies [23][24]. In addition to these fundamental limits, the importance of the nanoscale morphology of antennas has been identified as a key parameter affecting their far-field and near-field optical properties [25][26][27][28][29][30]. The simplest antenna geometries, whose optical
  • observed fluctuations in the fluorescence enhancement likely relate to variations in their far-field optical properties. Therefore, differences in the LSPR positions, width and the amplitude of the scattering-cross section may affect the near-field optical response. Due to the small gap size of CB[8
  • red-shifted from the LSPR peak. Taking into account the excitation wavelength of λexc = 632.8 nm used for the characterization of near-field optical properties of the dimers, the excitation rate enhancement is strongest for the dimers shown in Figure 4F–Figure 4H. For these dimers the scattering
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Published 17 Aug 2018

Electrospun one-dimensional nanostructures: a new horizon for gas sensing materials

  • Muhammad Imran,
  • Nunzio Motta and
  • Mahnaz Shafiei

Beilstein J. Nanotechnol. 2018, 9, 2128–2170, doi:10.3762/bjnano.9.202

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  • integration flexibility. To date, many different gas sensing technologies have been developed. The predominant approaches to utilization are based on changes in the electrical conductance, optical properties, electrochemical potential or resonant frequency of the device [12][13][14][15][16][17][18][19][20][21
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Published 13 Aug 2018

Light–Matter interactions on the nanoscale

  • Mohsen Rahmani and
  • Chennupati Jagadish

Beilstein J. Nanotechnol. 2018, 9, 2125–2127, doi:10.3762/bjnano.9.201

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  • , such as transition-metal dichalcogenides (TMDCs) or hexagonal boron nitride (hBN) [10] have also emerged as interesting platforms for nanophotonics. TMDCs, with their intrinsically broken inversion symmetry in crystal structure, have shown many advanced optical properties with potential applications
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Published 10 Aug 2018

Localized photodeposition of catalysts using nanophotonic resonances in silicon photocathodes

  • Evgenia Kontoleta,
  • Sven H. C. Askes,
  • Lai-Hung Lai and
  • Erik C. Garnett

Beilstein J. Nanotechnol. 2018, 9, 2097–2105, doi:10.3762/bjnano.9.198

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  • microscopy image analysis showed a reasonable correlation between the simulated hot spots and the actual experimental localization and quantity of platinum atoms. This nanophotonic approach of driving chemical reactions at the nanoscale using the optical properties of the photo-electrode, can be very
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Published 03 Aug 2018

Self-assembled quasi-hexagonal arrays of gold nanoparticles with small gaps for surface-enhanced Raman spectroscopy

  • Emre Gürdal,
  • Simon Dickreuter,
  • Fatima Noureddine,
  • Pascal Bieschke,
  • Dieter P. Kern and
  • Monika Fleischer

Beilstein J. Nanotechnol. 2018, 9, 1977–1985, doi:10.3762/bjnano.9.188

Graphical Abstract
  • remarkable optical properties make them attractive for applications in biosensing, biomedical science and as optical antennas [6][7][8]. In particular, metal nanoparticles can be employed to strongly enhance the signal intensity in chemically specific Raman sensing [9]. This technique is known as surface
  • different durations. Rough particles with sizes up to 120 nm in diameter are achieved in quasi-hexagonally ordered arrays, resulting in a high density of hotspots as has been shown for similar raspberry-like nanostructures [21][22]. Next, the optical properties of the samples are characterized by measuring
  • measurements the exposure time was set to 60 s to reduce noise. Results and Discussion We use the bottom-up method of BCML combined with ED to fabricate tunable gold nanoparticles forming quasi-hexagonal arrays on a silicon substrate. The optical properties of the gold nanoparticles are investigated by dark
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Published 12 Jul 2018

Toward the use of CVD-grown MoS2 nanosheets as field-emission source

  • Geetanjali Deokar,
  • Nitul S. Rajput,
  • Junjie Li,
  • Francis Leonard Deepak,
  • Wei Ou-Yang,
  • Nicolas Reckinger,
  • Carla Bittencourt,
  • Jean-Francois Colomer and
  • Mustapha Jouiad

Beilstein J. Nanotechnol. 2018, 9, 1686–1694, doi:10.3762/bjnano.9.160

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  • MoS2 NSs [9], MoS2 nanoflowers [13] and MoS2 nano-heteroarchitectures [14] have been reported. The semiconducting MoS2 NSs with exposed edges could significantly enhance the FE properties [9]. It is well known that the electrical and optical properties of MoS2 are influenced by their size, shape [15
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Published 07 Jun 2018

Photoluminescence of CdSe/ZnS quantum dots in nematic liquid crystals in electric fields

  • Margarita A. Kurochkina,
  • Elena A. Konshina and
  • Daria Khmelevskaia

Beilstein J. Nanotechnol. 2018, 9, 1544–1549, doi:10.3762/bjnano.9.145

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  • nanocrystals. These nanoparticles (NPs) of spherical shape are unique luminophores due to the dimensional dependence of the optical properties. The small dimensions of QDs (of the order of 1–10 nm) make it possible to integrate QDs relatively easily into hybrid structures and composite materials. Quantum dots
  • significantly changes their optical properties [6][7][8][9][10]. To control the properties of NPs, they are introduced into a passive or active matrix interacting with them. Liquid crystals can be an active matrix for NPs. The dielectric and optical properties of a liquid crystal (LC) vary under electromagnetic
  • polarizability and the dipole moment of the nanoparticles. The enhancement of the QD luminescence results from the transfer of energy, when the channels of nonradiative deactivation of QDs are eliminated [22]. The polarity of the surrounding molecules affects the optical properties of the QDs. The interaction
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Published 23 May 2018

Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film

  • Kalpana Singh,
  • Evgeniy Panchenko,
  • Babak Nasr,
  • Amelia Liu,
  • Lukas Wesemann,
  • Timothy J. Davis and
  • Ann Roberts

Beilstein J. Nanotechnol. 2018, 9, 1491–1500, doi:10.3762/bjnano.9.140

Graphical Abstract
  • ] and enhanced coupling to plasmonic cavities by emitters such as quantum dots [36]. One way to enhance the signal-to-noise ratio of transmission measurements is to study the collective optical properties of an array of apertures, choosing the periodicity to minimize both the effects of diffraction and
  • GaAs nanowires [46], modes of single and pairs of AlGaAs disks [47], the optical properties of quantum discs of GaN/AlN in GaN nanowires [48] and various modes of gold nanodecahedra [49]. The potential of CL used in transmission to observe various colour centres in nanodiamonds has also been
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Published 18 May 2018

Excitation of nonradiating magnetic anapole states with azimuthally polarized vector beams

  • Aristeidis G. Lamprianidis and
  • Andrey E. Miroshnichenko

Beilstein J. Nanotechnol. 2018, 9, 1478–1490, doi:10.3762/bjnano.9.139

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  • local magnetic to electric field intensity, could be significantly improved by employing these nano-optical properties that a magnetic anapole can offer. In this paper we discuss in detail the possibility of magnetic anapole excitation under various configurations and suggest how they can be tested
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Published 17 May 2018

New 2D graphene hybrid composites as an effective base element of optical nanodevices

  • Olga E. Glukhova,
  • Igor S. Nefedov,
  • Alexander S. Shalin and
  • Мichael М. Slepchenkov

Beilstein J. Nanotechnol. 2018, 9, 1321–1327, doi:10.3762/bjnano.9.125

Graphical Abstract
  • graphene) and in the optical range from 380 to 740 nm irrespective of the diameter of the tubes and the distance between them. For waves corresponding to the most intense peaks, the absorption coefficient as a function of the angle of incidence was calculated. It was shown that the optical properties of
  • values of 45–50% at these angles of incidence. Thus, one can say that the optical properties of the composite do not explicitly depend on the type of the tubes. In summary, it can be concluded that the new 2D CNT–graphene hybrid nanocomposite is very promising for optoelectronic devices. In particular
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Published 30 Apr 2018

Ag2WO4 nanorods decorated with AgI nanoparticles: Novel and efficient visible-light-driven photocatalysts for the degradation of water pollutants

  • Shijie Li,
  • Shiwei Hu,
  • Wei Jiang,
  • Yanping Liu,
  • Yu Liu,
  • Yingtang Zhou,
  • Liuye Mo and
  • Jianshe Liu

Beilstein J. Nanotechnol. 2018, 9, 1308–1316, doi:10.3762/bjnano.9.123

Graphical Abstract
  • , and UV–vis DRS were used to investigate the morphology and optical properties of the as-prepared AgI/Ag2WO4 catalyst. With AgI acting as the cocatalyst, the resulting AgI/Ag2WO4 heterostructure shows excellent performance in degrading toxic, stable pollutants such as rhodamine B (RhB), methyl orange
  • the formation of the AgI/Ag2WO4 heterojunctions, thereby facilitating the charge transfer between them [12]. Subsequently, the optical properties of as-prepared photocatalysts were investigated by UV–vis diffuse reflectance spectroscopy (DRS) analysis (Figure 4). As indicated from Figure 4, pure
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Published 27 Apr 2018

Computational exploration of two-dimensional silicon diarsenide and germanium arsenide for photovoltaic applications

  • Sri Kasi Matta,
  • Chunmei Zhang,
  • Yalong Jiao,
  • Anthony O'Mullane and
  • Aijun Du

Beilstein J. Nanotechnol. 2018, 9, 1247–1253, doi:10.3762/bjnano.9.116

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  • , electronic and optical properties using density functional theory (DFT), hybrid functional and Bethe–Salpeter equation (BSE) approaches. We find that the exfoliation of single-layer SiAs2 and GeAs2 is highly feasible and in principle could be carried out experimentally by mechanical cleavage due to the
  • the same IV–V group combination, we focus our study on two-dimensional SiAs2 and GeAs2 and compare them with their bulk counter parts with regard to electronic band structure, phonon-vibration frequencies, optical properties, band gap modulation behavior and predict their potential applications
  • bulk equivalent of the same material”, Ef: where, E2D and E3D are the energies of the monolayer and the bulk material, respectively. n2D and n3D are the number of atoms present in the unit cells considered for the calculations [18][19][20]. The optical properties are evaluated by determining the
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Published 19 Apr 2018

A novel copper precursor for electron beam induced deposition

  • Caspar Haverkamp,
  • George Sarau,
  • Mikhail N. Polyakov,
  • Ivo Utke,
  • Marcos V. Puydinger dos Santos,
  • Silke Christiansen and
  • Katja Höflich

Beilstein J. Nanotechnol. 2018, 9, 1220–1227, doi:10.3762/bjnano.9.113

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  • deposition; nanostructures; optical properties; Introduction The focused electron beam in a scanning electron microscope can be used to deposit material. This process is often observed as an unwanted side effect in electron microscopy. Residual chamber gases, adsorbed on the substrate surface, are
  • nm, resembling well the structure of the 2D deposit. The average EDX signal from nanopillars gives a composition of 26 atom % Cu, 13 atom % O and 61 atom % C. Hence, the retrieved mean value for the refractive index may serve as a meaningful estimation to simulate the optical properties of an array
  • case the metal particles are treated quasistatically as dipole scatterers. The analytical formula for dipole scatterers in a dielectric matrix is given by the Maxwell–Garnett (MG) approach. A large uncertainty in modeling the dielectric function of the FEBID composite stems from the unknown optical
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Published 18 Apr 2018

Theoretical study of strain-dependent optical absorption in a doped self-assembled InAs/InGaAs/GaAs/AlGaAs quantum dot

  • Tarek A. Ameen,
  • Hesameddin Ilatikhameneh,
  • Archana Tankasala,
  • Yuling Hsueh,
  • James Charles,
  • Jim Fonseca,
  • Michael Povolotskyi,
  • Jun Oh Kim,
  • Sanjay Krishna,
  • Monica S. Allen,
  • Jeffery W. Allen,
  • Rajib Rahman and
  • Gerhard Klimeck

Beilstein J. Nanotechnol. 2018, 9, 1075–1084, doi:10.3762/bjnano.9.99

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  • intermediate-band solar cells (IBSCs) [3][4]. The optical properties of quantum dots (QDs) can be tuned through shape, dimensions and composition of the dots making them attractive for optoelectronic applications. Moreover, their sensitivity to normally incident light make them advantageous over other
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Published 04 Apr 2018

Review on nanoparticles and nanostructured materials: history, sources, toxicity and regulations

  • Jaison Jeevanandam,
  • Ahmed Barhoum,
  • Yen S. Chan,
  • Alain Dufresne and
  • Michael K. Danquah

Beilstein J. Nanotechnol. 2018, 9, 1050–1074, doi:10.3762/bjnano.9.98

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  • started using glazed ceramics for metallic luster decorations [22]. These decorations showed amazing optical properties due to the existence of distinct Ag and/or Cu NPs isolated within the outermost glaze layers. These decorations are an example of metal nanoparticles that display iridescent bright green
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Published 03 Apr 2018

Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system

  • Karolline A. S. Araujo,
  • Luiz A. Cury,
  • Matheus J. S. Matos,
  • Thales F. D. Fernandes,
  • Luiz G. Cançado and
  • Bernardo R. A. Neves

Beilstein J. Nanotechnol. 2018, 9, 963–974, doi:10.3762/bjnano.9.90

Graphical Abstract
  • ] and, thus, its optical properties are key to the successful development of devices. Since molecular packing and ordering influence optical properties of organic semiconductors [7][8][9][10][11][12][13], it is important to investigate whether the graphene-induced ordering affected the optical
  • -assembled monolayer of retinoic acid atop graphene. The RA SAM optical properties indicate that such high molecular ordering reduces the exciton interaction with nonradiative processes, leading to a temperature-independent high emission efficiency. Photo-assisted EFM and SKPM measurements carried out on the
  • properties of this novel RA SAM structure. Therefore, photoluminescence (PL) studies of RA monolayers and multilayers atop graphite microplates were performed as a function of temperature (Figure 3). Initially, in order to emulate thick and disordered RA films, a graphite microplate substrate was spread
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Published 23 Mar 2018

Effect of ferroelectric BaTiO3 particles on the threshold voltage of a smectic A liquid crystal

  • Abbas R. Imamaliyev,
  • Mahammadali A. Ramazanov and
  • Shirkhan A. Humbatov

Beilstein J. Nanotechnol. 2018, 9, 824–828, doi:10.3762/bjnano.9.76

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  • ferroelectric particles. The oleic acid in many cases worsens the materials properties, for example, reduces the clearing point of the liquid crystal [13]. Thanks to the layered structure, smectic LCs have special physical (mechanical, electrical and optical) properties, which opens up wide possibilities for
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Published 07 Mar 2018

Facile synthesis of a ZnO–BiOI p–n nano-heterojunction with excellent visible-light photocatalytic activity

  • Mengyuan Zhang,
  • Jiaqian Qin,
  • Pengfei Yu,
  • Bing Zhang,
  • Mingzhen Ma,
  • Xinyu Zhang and
  • Riping Liu

Beilstein J. Nanotechnol. 2018, 9, 789–800, doi:10.3762/bjnano.9.72

Graphical Abstract
  • cutoff value is about 1.22 eV. The change in the state, along with the difference in the shape from pure BiOI and ZnO, is probably due to the band bending attributed to the formation of ZnO–BiOI heterojunctions, as its Bi/Zn molar ratio is 1:3. Optical properties To investigate the photo-induced charge
  • beneficial for improving the charge separation ability. The light adsorption ability and the band gap structure are some of the decisive factors for photocatalysis. Therefore, the UV–vis diffuse reflection spectra (UV-DRS) is worthy of study to explore their optical properties. The UV-DRS results are shown
  • spectrum for: (a) O 1s core energy of B-1, B-4 and B-6; (b) Bi 4f of B-1 and B-4 samples; (c) Zn 2p of B-4 and B-6 samples; (d) I 3d of B-1 and B-4 samples; and (e) XPS valence band spectrum of samples B-1, B-4 and B-6. Optical properties of the as-prepared samples (a) UV–vis DRS spectra where the inset
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Published 05 Mar 2018

Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna

  • Haitao Chen,
  • Mingkai Liu,
  • Lei Xu and
  • Dragomir N. Neshev

Beilstein J. Nanotechnol. 2018, 9, 780–788, doi:10.3762/bjnano.9.71

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  • 10.3762/bjnano.9.71 Abstract Background: Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) with intrinsically crystal inversion-symmetry breaking have shown many advanced optical properties. In particular, the valley polarization in 2D TMDCs that can be addressed optically has inspired new
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Published 02 Mar 2018
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