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Search for "optical properties" in Full Text gives 427 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Polydopamine-coated Au nanorods for targeted fluorescent cell imaging and photothermal therapy

  • Boris N. Khlebtsov,
  • Andrey M. Burov,
  • Timofey E. Pylaev and
  • Nikolai G. Khlebtsov

Beilstein J. Nanotechnol. 2019, 10, 794–803, doi:10.3762/bjnano.10.79

Graphical Abstract
  • integrate various functionalities by incorporating different diagnostic and therapeutic agents into a single core/shell nanoparticle. Au nanorods (AuNRs) have attracted a great interest as a platform for theranostic applications because of tunable optical properties and simple protocols for synthesis with
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Published 01 Apr 2019

Towards rare-earth-free white light-emitting diode devices based on the combination of dicyanomethylene and pyranine as organic dyes supported on zinc single-layered hydroxide

  • Jeff L. Nyalosaso,
  • Rachod Boonsin,
  • Pierre Vialat,
  • Damien Boyer,
  • Geneviève Chadeyron,
  • Rachid Mahiou and
  • Fabrice Leroux

Beilstein J. Nanotechnol. 2019, 10, 760–770, doi:10.3762/bjnano.10.75

Graphical Abstract
  • are dispersed in an inorganic matrix such as silica [7]. Studies have been carried out on materials obtained by mixing a dye and a double-layered hydroxide solid compound [8][9][10][11]. Unfortunately, the optical properties of these materials, particularly their performance, are not yet satisfactory
  • is to trap the organic molecules by intercalation so as to preserve their optical properties [10][11]. In the solid matrix the molecule dyes are arranged in the interlayer spaces by monolayer particle assembly and a direct anion-exchange procedure in organic media [12]. Depending on the nature of the
  • . The optical properties of the luminescent wet hybrid materials and films were recorded. Finally, a down-conversion pseudo-white LED was designed by simply associating, in remote-phosphor configuration, silicone/SLH-dye composite film and a GaN LED emitting at 450 nm. Composite films with a single dye
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Published 25 Mar 2019

On the transformation of “zincone”-like into porous ZnO thin films from sub-saturated plasma enhanced atomic layer deposition

  • Alberto Perrotta,
  • Julian Pilz,
  • Stefan Pachmajer,
  • Antonella Milella and
  • Anna Maria Coclite

Beilstein J. Nanotechnol. 2019, 10, 746–759, doi:10.3762/bjnano.10.74

Graphical Abstract
  • ]. Spectroscopic ellipsometry (J.A. Woollam M-2000V) was used to deter0mine the thickness and optical properties of the films after deposition. The measurements were carried out at three different angles (65°, 70°, and 75°) in a wavelength range from 370 to 1000 nm. The analysis of the spectra was performed with
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Published 21 Mar 2019

An iridescent film of porous anodic aluminum oxide with alternatingly electrodeposited Cu and SiO2 nanoparticles

  • Menglei Chang,
  • Huawen Hu,
  • Haiyan Quan,
  • Hongyang Wei,
  • Zhangyi Xiong,
  • Jiacong Lu,
  • Pin Luo,
  • Yaoheng Liang,
  • Jianzhen Ou and
  • Dongchu Chen

Beilstein J. Nanotechnol. 2019, 10, 735–745, doi:10.3762/bjnano.10.73

Graphical Abstract
  • and optical properties of a series of the electrodeposited AAO-based thin film were investigated. The Cu and SiO2 NPs were found to be uniformly deposited into the porous structure of the AAO film, and the alternating electrodeposition repeating twice led to the formation of the optimal AAO-based thin
  • colors are also expected to enrich the aluminum alloys with vivid optical properties [21]. Structural colors are generated by light diffraction, interference and scattering [20], completely different from pigment colors involving the selective absorption of a certain light waves and the reflection of the
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Published 19 Mar 2019

Ultrasonication-assisted synthesis of CsPbBr3 and Cs4PbBr6 perovskite nanocrystals and their reversible transformation

  • Longshi Rao,
  • Xinrui Ding,
  • Xuewei Du,
  • Guanwei Liang,
  • Yong Tang,
  • Kairui Tang and
  • Jin Z. Zhang

Beilstein J. Nanotechnol. 2019, 10, 666–676, doi:10.3762/bjnano.10.66

Graphical Abstract
  • perovskite nanocrystals (PNCs) and their reversible transformation. The as-prepared CsPbBr3 PNCs and Cs4PbBr6 PNCs exhibit different optical properties that depend on their morphology, size, and structure. The photoluminescence (PL) emission and quantum yield (QY) of the CsPbBr3 PNCs can be tuned by changing
  • shape and size are tuned through the control of temperature, reaction time, and composition of the precursors [15][16][17]. Chen et al. demonstrated a facile solvothermal method for preparing CsPbX3 PNCs with adjustable optical properties [18]. Additionally, Li's group reported a poly(lactic acid
  • improved photostability and chemical stability of CsPbBr3 PNCs. Effect of synthesis conditions Our previous study has shown that ultrasound power and radiation time have a great influence on the optical properties of the CsPbBr3 PNCs [30]. In this study, we found that the immersion height of the vibrating
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Published 06 Mar 2019

Direct observation of the CVD growth of monolayer MoS2 using in situ optical spectroscopy

  • Claudia Beatriz López-Posadas,
  • Yaxu Wei,
  • Wanfu Shen,
  • Daniel Kahr,
  • Michael Hohage and
  • Lidong Sun

Beilstein J. Nanotechnol. 2019, 10, 557–564, doi:10.3762/bjnano.10.57

Graphical Abstract
  • , each type of 2D TMDC material possesses specific optical properties which are characteristic of their chemical composition, crystalline structure, and number of layers [2][20]. Their optical properties are also sensitive to extrinsic modifications, for instance, interaction with substrate [21], gas
  • , atmosphere, and even high pressure conditions. Consequently, optical spectroscopy is the method of choice for in situ studies during CVD growth. Monitoring the evolution of the optical properties of 2D TMDCs during CVD growth may provide a sensitive means to assess the surface processes and to characterize
  • the optical properties of 2D TMDCs [2][20] and, most recently, also to monitor the molecular beam epitaxy of monolayer MoSe2 on sapphire substrates [27]. In the current work, we have applied an analogous technology, namely, differential transmittance spectroscopy (DTS), to realize the in situ real
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Published 26 Feb 2019

Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering

  • Yarong Su,
  • Yuanzhen Shi,
  • Ping Wang,
  • Jinglei Du,
  • Markus B. Raschke and
  • Lin Pang

Beilstein J. Nanotechnol. 2019, 10, 549–556, doi:10.3762/bjnano.10.56

Graphical Abstract
  • dependent on the local atomic environment of the adsorbate. Optical properties, such as the locations of the optical transitions, oscillator strengths, and homogeneous linewidths, are also critical for molecule–metal complex systems [29]. With improved knowledge of the resonance characteristics and
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Published 25 Feb 2019

Ceria/polymer nanocontainers for high-performance encapsulation of fluorophores

  • Kartheek Katta,
  • Dmitry Busko,
  • Yuri Avlasevich,
  • Katharina Landfester,
  • Stanislav Baluschev and
  • Rafael Muñoz-Espí

Beilstein J. Nanotechnol. 2019, 10, 522–530, doi:10.3762/bjnano.10.53

Graphical Abstract
  • the π-conjugated core system of highly fluorescent perylene-3,4:9,10-tetracarboxdimides. The rylene dyes have unique optical properties, such as high extinction coefficients, high thermal, chemical and photochemical stabilities, and exhibit brilliant colors [29][30]. Furthermore, in bulk samples, TDI
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Published 22 Feb 2019

Ultraviolet patterns of flowers revealed in polymer replica – caused by surface architecture

  • Anna J. Schulte,
  • Matthias Mail,
  • Lisa A. Hahn and
  • Wilhelm Barthlott

Beilstein J. Nanotechnol. 2019, 10, 459–466, doi:10.3762/bjnano.10.45

Graphical Abstract
  • differences even within just the three model plants. From a technical point of view, these results are promising and important for different types of applications given that the optical properties of surfaces are becoming more relevant, for example, for hierarchically structured solar panels, biomimetic
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Published 13 Feb 2019

Gold nanoparticles embedded in a polymer as a 3D-printable dichroic nanocomposite material

  • Lars Kool,
  • Anton Bunschoten,
  • Aldrik H. Velders and
  • Vittorio Saggiomo

Beilstein J. Nanotechnol. 2019, 10, 442–447, doi:10.3762/bjnano.10.43

Graphical Abstract
  • nor its printability. Thus, the nanocomposite can be easily 3D-printed using a standard 3D printer and shows a purple color in transmission and a brownish color in reflection. Conclusion: This methodology can be used not only by artists, but also for studying the optical properties of nanoparticles or
  • dichroic effect. Conclusion In conclusion, we showed how to synthesize and embed dichroic nanoparticles in 3D-printable material. The AuNP–PVA nanocomposite is mechanically similar to the bare plastic material, and its dichroic optical properties are similar to the the AuNP solution. The 3D-printed objects
  • can be coated to achieve water impermeability and stability at room temperature for long time. We can envision this methodology to be used not only by artists, but also for studying optical properties of nanoparticles or, for example, for the 3D fabrication of optical filters. Experimental General
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Published 12 Feb 2019

Sub-wavelength waveguide properties of 1D and surface-functionalized SnO2 nanostructures of various morphologies

  • Venkataramana Bonu,
  • Binaya Kumar Sahu,
  • Arindam Das,
  • Sankarakumar Amirthapandian,
  • Sandip Dhara and
  • Harish C. Barshilia

Beilstein J. Nanotechnol. 2019, 10, 379–388, doi:10.3762/bjnano.10.37

Graphical Abstract
  • , which matches closely with our experimental results. Optical properties Waveguide nature SnO2 NBs have been shown to be very good sub-wavelength waveguides among the metal oxides [6][12]. Figure 6 and Figure 7 depict optical images of the single SnO2 NWs demonstrating their waveguide behaviour. Similar
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Published 07 Feb 2019

Geometrical optimisation of core–shell nanowire arrays for enhanced absorption in thin crystalline silicon heterojunction solar cells

  • Robin Vismara,
  • Olindo Isabella,
  • Andrea Ingenito,
  • Fai Tong Si and
  • Miro Zeman

Beilstein J. Nanotechnol. 2019, 10, 322–331, doi:10.3762/bjnano.10.31

Graphical Abstract
  • Simulator” (HFSS) was employed [44], which allows for the modelling of thin-film optoelectronic devices with arbitrarily complex geometries [45][46][47][48][49][50][51][52]. To ensure accuracy, accurately measured optical properties (refractive index n and extinction coefficient κ) of each material of the
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Published 31 Jan 2019

Magnetic-field sensor with self-reference characteristic based on a magnetic fluid and independent plasmonic dual resonances

  • Kun Ren,
  • Xiaobin Ren,
  • Yumeng He and
  • Qun Han

Beilstein J. Nanotechnol. 2019, 10, 247–255, doi:10.3762/bjnano.10.23

Graphical Abstract
  • the change of environmental conditions are one of the most important devices in optical communication. Optical sensors are obtained by monitoring the change of optical properties based on, e.g., thermo-optic, electro-optic, and magneto-optic effects. In the area of magnetic-field sensors, magnetic
  • -field sensor based on a MF and a plasmonic structure. As far as we know, the combination of a MF with a plasmonic waveguide has not been reported to date. The unique magnetic-optical properties of MFs are the basis of the optical sensor. The plasmonic structure is a MDM waveguide–cavity coupled system
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Published 22 Jan 2019

Study of silica-based intrinsically emitting nanoparticles produced by an excimer laser

  • Imène Reghioua,
  • Mattia Fanetti,
  • Sylvain Girard,
  • Diego Di Francesca,
  • Simonpietro Agnello,
  • Layla Martin-Samos,
  • Marco Cannas,
  • Matjaz Valant,
  • Melanie Raine,
  • Marc Gaillardin,
  • Nicolas Richard,
  • Philippe Paillet,
  • Aziz Boukenter,
  • Youcef Ouerdane and
  • Antonino Alessi

Beilstein J. Nanotechnol. 2019, 10, 211–221, doi:10.3762/bjnano.10.19

Graphical Abstract
  • , pure silica nanoparticles were produced using a laser pulse energy of 400 mJ on pure silica, whereas Ge-doped nanoparticles were obtained using 33 and 165 mJ per pulse on germanosilicate glass. The difference in the required energy is attributed to the Ge doping, which modifies the optical properties
  • in the required energy per pulse has been attributed to the high Ge doping level, which affects the optical properties of the silica. As a consequence of the presence of the GLPC, the emission activity was studied using cathodoluminescence measurements only for the Ge-doped nanoparticles. In addition
  • we also noted a significant correspondence between the morphology studied by SEM images and those studied by cathodoluminescence, suggesting a certain homogeneity in the optical properties of both samples. The amorphous structure (as investigated by TEM) and qualitative homogeneity in chemical
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Published 16 Jan 2019

Uniform Sb2S3 optical coatings by chemical spray method

  • Jako S. Eensalu,
  • Atanas Katerski,
  • Erki Kärber,
  • Ilona Oja Acik,
  • Arvo Mere and
  • Malle Krunks

Beilstein J. Nanotechnol. 2019, 10, 198–210, doi:10.3762/bjnano.10.18

Graphical Abstract
  • were investigated using Raman spectroscopy, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy and UV–vis–NIR spectroscopy. We demonstrated that Sb2S3 optical coatings with controllable structure, morphology and optical properties can be deposited by ultrasonic spray
  • solution, and the post-deposition treatment temperature on the structure, morphology and optical properties of ultrasonically sprayed Sb2S3 thin films. Results and Discussion Two sequential operations were used to obtain homogeneous Sb2S3 optical coatings with uniform thickness on planar TiO2 substrates
  • spraying in air is illustrated in Figure 6. Optical properties of as-deposited and thermally treated Sb2S3 layers The absorption coefficient (α) and band gap (Eg) values of Sb2S3 in both as-deposited and thermally treated glass/ITO/TiO2/Sb2S3 samples were determined using an approximated Sb2S3 layer
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Published 15 Jan 2019

Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes

  • Mateusz Mrukiewicz,
  • Krystian Kowiorski,
  • Paweł Perkowski,
  • Rafał Mazur and
  • Małgorzata Djas

Beilstein J. Nanotechnol. 2019, 10, 71–78, doi:10.3762/bjnano.10.7

Graphical Abstract
  • electric field can change the director orientation thereby causing a change in the optical properties. In the absence of an electric field, the orientation of n is determined by anchoring conditions. The field-induced reorientation of the LC director is known as the Frédericksz effect [3]. In the
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Published 07 Jan 2019

Surface plasmon resonance enhancement of photoluminescence intensity and bioimaging application of gold nanorod@CdSe/ZnS quantum dots

  • Siyi Hu,
  • Yu Ren,
  • Yue Wang,
  • Jinhua Li,
  • Junle Qu,
  • Liwei Liu,
  • Hanbin Ma and
  • Yuguo Tang

Beilstein J. Nanotechnol. 2019, 10, 22–31, doi:10.3762/bjnano.10.3

Graphical Abstract
  • formed with metals and semiconductors, i.e., plasmonic, composite QD nanostructures, provides another efficient way to tune the unique optical properties. In the past decades, much attention has been given to the development of metal-enhanced optical properties. Some researchers have noted that certain
  • stability and biocompatibility of GNRs has been reported by several researchers, and they are being investigated as a probe for photothermal therapy in nanomedicine. The presence of longitudinal surface plasmon resonance (LSPR) provides GNRs with richer optical properties, which lead to local field, Raman
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Published 03 Jan 2019

Zn/F-doped tin oxide nanoparticles synthesized by laser pyrolysis: structural and optical properties

  • Florian Dumitrache,
  • Iuliana P. Morjan,
  • Elena Dutu,
  • Ion Morjan,
  • Claudiu Teodor Fleaca,
  • Monica Scarisoreanu,
  • Alina Ilie,
  • Marius Dumitru,
  • Cristian Mihailescu,
  • Adriana Smarandache and
  • Gabriel Prodan

Beilstein J. Nanotechnol. 2019, 10, 9–21, doi:10.3762/bjnano.10.2

Graphical Abstract
  • (3.6 eV). This may be attributed to the impurity clustering which occurs in heavily doped semiconductors. Also, the carbon presence in all (including the reference without F and Zn) of our laser-synthesized tin-oxide-based nanopowders can also influence the optical properties, including the bandgap
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Published 02 Jan 2019

Variation of the photoluminescence spectrum of InAs/GaAs heterostructures grown by ion-beam deposition

  • Alexander S. Pashchenko,
  • Leonid S. Lunin,
  • Eleonora M. Danilina and
  • Sergei N. Chebotarev

Beilstein J. Nanotechnol. 2018, 9, 2794–2801, doi:10.3762/bjnano.9.261

Graphical Abstract
  • -shift of the photoluminescence peak of InAs/GaAs heterostructures. An increase in the thickness of the GaAs barrier layers was accompanied by a blue shift of the photoluminescence peak. The effect of isovalent Bi doping of the GaAs barrier layers on the structural and optical properties of the InAs/GaAs
  • directions leads to a low thermionic emission and decreases the dark current [5][6]. InAs/GaAs, Ge/Si, and others are examples of such heterostructures [7][8][9][10][11][12][13][14]. The structural and optical properties of InAs QDs rely heavily on their surrounding matrix, which is separated into two parts
  • heterostructures [17][18][20][32][33]. In this regard, a study of the influence of Bi on the optical properties of InAs/GaAs heterostructures is an actual requirement. In this work, ion-beam deposition (IBD) is used to grow the samples. IBD has significant advantages over many methods of growth from the gas phase
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Published 02 Nov 2018

Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

  • Alexander Rostek,
  • Marina Breisch,
  • Kevin Pappert,
  • Kateryna Loza,
  • Marc Heggen,
  • Manfred Köller,
  • Christina Sengstock and
  • Matthias Epple

Beilstein J. Nanotechnol. 2018, 9, 2763–2774, doi:10.3762/bjnano.9.258

Graphical Abstract
  • [89]. It was shown by Ino that metal nanoparticles (Ag, Au, Cu, Pd, Pt) prefer an icosahedral structure if their diameter is smaller than approximately 10 nm. Nanocrystals with larger diameters prefer the shape of a truncated octahedron [88][90]. UV–vis spectroscopy gives information on the optical
  • properties of nanoparticles, e.g., surface plasmon resonance (SPR) effects (Figure 5). While the dispersions of platinum group nanoparticles (Rh, Pd, Pt) were all brown-black and had no distinct absorption in the visible range, silver and gold showed the typical surface plasmon resonance (SPR) absorption
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Published 29 Oct 2018

Low cost tips for tip-enhanced Raman spectroscopy fabricated by two-step electrochemical etching of 125 µm diameter gold wires

  • Antonino Foti,
  • Francesco Barreca,
  • Enza Fazio,
  • Cristiano D’Andrea,
  • Paolo Matteini,
  • Onofrio Maria Maragò and
  • Pietro Giuseppe Gucciardi

Beilstein J. Nanotechnol. 2018, 9, 2718–2729, doi:10.3762/bjnano.9.254

Graphical Abstract
  • tip is the key element in TERS. Its field enhancement and confinement capabilities determine the signal amplification, the spatial resolution and the reproducibility of the results. The material, morphology, aspect ratio and size of the tip apex are expected to determine the optical properties of the
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Published 22 Oct 2018

Optimization of Mo/Cr bilayer back contacts for thin-film solar cells

  • Nima Khoshsirat,
  • Fawad Ali,
  • Vincent Tiing Tiong,
  • Mojtaba Amjadipour,
  • Hongxia Wang,
  • Mahnaz Shafiei and
  • Nunzio Motta

Beilstein J. Nanotechnol. 2018, 9, 2700–2707, doi:10.3762/bjnano.9.252

Graphical Abstract
  • properties have significant effects on the solar cell performance. This layer acts as an optical reflector to the photons that are not absorbed in the active medium, and as a metallic contact layer to transport drive out the photo-generated carriers [1][2]. In addition to these electro-optical properties
  • part in the deposition of the Mo thin film using a DC sputter system is to find the right compromise between the adhesion of the film to the substrate (mostly soda–lime glass (SLG)) and its electro-optical properties. It is well known that the film adhesion and its conductivity show opposite trends as
  • Cr to develop a new protocol that improves the adhesion of the Mo back contact layer to the substrate and demonstrate the excellent electro-optical properties of the Mo/Cr film for solar cells applications. The morphological and optical properties of the deposited films have been investigated using
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Published 18 Oct 2018

Silencing the second harmonic generation from plasmonic nanodimers: A comprehensive discussion

  • Jérémy Butet,
  • Gabriel D. Bernasconi and
  • Olivier J. F. Martin

Beilstein J. Nanotechnol. 2018, 9, 2674–2683, doi:10.3762/bjnano.9.250

Graphical Abstract
  • small gaps can easily be achieved using capillary assembly with optimized templates, for example [7]. The linear optical properties of gold dimers with gaps of 5 nm, 20 nm, and 60 nm are considered first. The scattered intensity is shown as a function of the incident wavelength in Figure 1b. For
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Published 15 Oct 2018

Polarization-dependent strong coupling between silver nanorods and photochromic molecules

  • Gwénaëlle Lamri,
  • Alessandro Veltri,
  • Jean Aubard,
  • Pierre-Michel Adam,
  • Nordin Felidj and
  • Anne-Laure Baudrion

Beilstein J. Nanotechnol. 2018, 9, 2657–2664, doi:10.3762/bjnano.9.247

Graphical Abstract
  • largely damped oscillators [16]. It is of note that the main dipolar plasmonic resonance sustained by a cylindrical nanoparticle is not dependent on the in-plane incident polarization due to the symmetry center of the nanoparticle. However, a polarization-dependent control of the optical properties of a
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Published 08 Oct 2018

Impact of the anodization time on the photocatalytic activity of TiO2 nanotubes

  • Jesús A. Díaz-Real,
  • Geyla C. Dubed-Bandomo,
  • Juan Galindo-de-la-Rosa,
  • Luis G. Arriaga,
  • Janet Ledesma-García and
  • Nicolas Alonso-Vante

Beilstein J. Nanotechnol. 2018, 9, 2628–2643, doi:10.3762/bjnano.9.244

Graphical Abstract
  • and optical properties and this is further discussed in the following sections. Raman spectroscopy Raman spectra obtained after annealing at 450 °C in air are shown in Figure 4. Anatase is the stable phase with bands at 193.1 (Eg), 393.7 (B1g), 514.2 (A1g), and 634.7 cm−1 (Eg), as well as a sharp and
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Published 04 Oct 2018
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