Characterization, bio-uptake and toxicity of polymer-coated silver nanoparticles and their interaction with human peripheral blood mononuclear cells

• Sahar Pourhoseini,
• Reilly T. Enos,
• Angela E. Murphy,
• Bo Cai and
• Jamie R. Lead

Beilstein J. Nanotechnol. 2021, 12, 282–294, doi:10.3762/bjnano.12.23

• laser Doppler electrophoresis (Malvern Zetasizer NanoZS, MA, USA). The mean of at least three consecutive measurements was reported. DLS data for AgNPs in RPMI medium was not included because of the low concentrations used. Absorption spectra of PVP-AgNPs was recorded in triplicate over the wavelength

Absorption and photoconductivity spectra of amorphous multilayer structures

• Oxana Iaseniuc and
• Mihail Iovu

Beilstein J. Nanotechnol. 2020, 11, 1757–1763, doi:10.3762/bjnano.11.158

• agreement with the absorption spectra. The spectral distribution of the photocurrent for the HS is situated between the distributions of the separate layers and depends on the polarity of the illuminated electrode. The positions of the maximum of Al–Ge0.09As0.09Se0.82–Al (hν = 2.47 eV) and the maxima of Al

• = f(λ) of separate amorphous thin films and multilayer HS (1: Ge0.30As0.04S0.66, 2: Ge0.09As0.09Se0.82, 3: As0.40S0.30Se0.30, 4: As0.40S0.30Se0.30/Ge0.09As0.09Se0.82/Ge0.30As0.04S0.66). Absorption spectra α = f(hν) of separate amorphous thin films and multilayer HS (1: Ge0.30As0.04S0.66, 2

Cardiomyocyte uptake mechanism of a hydroxyapatite nanoparticle mediated gene delivery system

• Hiroaki Komuro,
• Masahiro Yamazoe,
• Kosuke Nozaki,
• Akiko Nagai and
• Tetsuo Sasano

Beilstein J. Nanotechnol. 2020, 11, 1685–1692, doi:10.3762/bjnano.11.150

• the as-prepared sample are consistent with the characteristic peaks of the standard hydroxyapatite peak positions and with the corresponding intensities of the diffraction peaks for HAp (International Centre for Diffraction Data, ICDD, no. 09-0432, vertical lines). The FTIR absorption spectra of the

The influence of an interfacial hBN layer on the fluorescence of an organic molecule

• Christine Brülke,
• Oliver Bauer and
• Moritz M. Sokolowski

Beilstein J. Nanotechnol. 2020, 11, 1663–1684, doi:10.3762/bjnano.11.149

• values are given in Table 2. Note that only PTCDA/hBN/SiO2 was investigated by FL spectroscopy while for PTCDA/hBN/Pt(111) and PTCDA/hBN/Rh(111) absorption spectra were measured. We cannot explain the differences of the S0/S1 transition energies, yet. However, we observe a trend of higher transition

Cu₂O nanoparticles for the degradation of methyl parathion

• Juan Rizo,
• David Díaz,
• Benito Reyes-Trejo and
• M. Josefina Arellano-Jiménez

Beilstein J. Nanotechnol. 2020, 11, 1546–1555, doi:10.3762/bjnano.11.137

• similar results. Likewise, degradation experiments in the darkness were also performed giving identical results to those under daylight thus photocatalytic degradation was ruled out. Instrumentation UV–vis electronic absorption spectra were acquired on an Ocean Optics CHEM-2000 spectrophotometer equipped

Self-assembly and spectroscopic fingerprints of photoactive pyrenyl tectons on hBN/Cu(111)

• Domenik M. Zimmermann,
• Knud Seufert,
• Luka Ðorđević,
• Tobias Hoh,
• Sushobhan Joshi,
• Tomas Marangoni,
• Davide Bonifazi and
• Willi Auwärter

Beilstein J. Nanotechnol. 2020, 11, 1470–1483, doi:10.3762/bjnano.11.130

• pyrene derivatives, respectively) confirmed the fact that for both structures, the ground and excited states were similar, while the matching excitation and absorption spectra pointed at an efficient radiative deactivation of the excited state (Figure S13, Supporting Information File 1) [71]. TDDFT

• absorption and emission spectra. Absorption spectra were recorded using air-equilibrated solutions at rt, with an Agilent Cary 5000 UV–vis spectrophotometer using quartz cells with a path length of 1.0 cm. Emission spectra were recorded on an Agilent Cary Eclipse fluorescence spectrofluorometer. Emission

Plant growth regulation by seed coating with films of alginate and auxin-intercalated layered double hydroxides

• Vander A. de Castro,
• Valber G. O. Duarte,
• Danúbia A. C. Nobre,
• Geraldo H. Silva,
• Vera R. L. Constantino,
• Frederico G. Pinto,
• Willian R. Macedo and
• Jairo Tronto

Beilstein J. Nanotechnol. 2020, 11, 1082–1091, doi:10.3762/bjnano.11.93

• ) were recorded in a Shimadzu X-ray Diffractometer XRD-6000 mode using Cu Kα1 radiation (λ = 1.5406 Å), 40 kV, 40 mA, sweep range 2θ from 2° to 70° with a scan step of 0.02°/s. Electronic absorption spectra were acquired in an equipment Thermo Scientific model Evolution 300. The morphology of the LDH

A few-layer graphene/chlorin e6 hybrid nanomaterial and its application in photodynamic therapy against Candida albicans

• Selene Acosta,
• Carlos Moreno-Aguilar,
• Dania Hernández-Sánchez,
• Beatriz Morales-Cruzado,
• Erick Sarmiento-Gomez,
• Carla Bittencourt,
• Luis Octavio Sánchez-Vargas and
• Mildred Quintana

Beilstein J. Nanotechnol. 2020, 11, 1054–1061, doi:10.3762/bjnano.11.90

• system characterization. a) UV–vis absorption spectra of pristine Ce6 (blue) and FLG-Ce6 (green). b) Singlet oxygen production assays. Singlet oxygen is indirectly observed through the fluorescence of the reporter molecule, singlet oxygen sensor green reagent; the higher fluorescence is related to higher

Excitonic and electronic transitions in Me–Sb₂Se₃ structures

• Nicolae N. Syrbu,
• Victor V. Zalamai,
• Ivan G. Stamov and
• Stepan I. Beril

Beilstein J. Nanotechnol. 2020, 11, 1045–1053, doi:10.3762/bjnano.11.89

• triselenide; band structure; excitons; optical spectroscopy; reflection and absorption spectra; Introduction Antimony selenide (Sb2Se3) is an inorganic semiconductor compound with interesting photoelectric properties. This material has a high absorption coefficient (≈105 cm−1) in the region of maximum solar

• crystal lattice, Sb2Se3 is a 2D semiconductor with a layered structure in which the Sb and Se atoms are connected with three other atoms of the opposite type, which in turn are connected within the crystal through weak secondary bonds. Figure 2 shows the absorption spectra of the Sb2Se3 crystal (thickness

• absorption spectra of the Sb2Se3 single crystal with a 13 μm thickness measured at room temperature under E||c and E⟂c polarization conditions. The spectra show the high absorption coefficients with maxima at 1.162 eV (marked as A, E||c) and 1.185 eV (marked as B, E⟂c) at the absorption level of 2 × 104 cm−1

A new photodetector structure based on graphene nanomeshes: an ab initio study

• Babak Sakkaki,
• Hassan Rasooli Saghai,
• Ghafar Darvish and
• Mehdi Khatir

Beilstein J. Nanotechnol. 2020, 11, 1036–1044, doi:10.3762/bjnano.11.88

• makes it suitable for optical devices. Keywords: absorption spectra; DFT calculations; graphene nanomesh; graphene nanoribbon; photodetectors; Introduction Graphene monolayers with honeycomb crystal structure have unique electrical and optical properties and have received a lot of attention recently

• shows the absorption spectra of different GNM structures. For better comparison, spectra of GNMs with equal hole size are plotted together with the absorption spectrum of graphene. The absorption spectrum of these nanostructures also has a peak in the range of 0 to 2 eV. The maximum value of these peaks

• is around 300,000 cm−1, which is larger than that of GNRs. By comparing the absorption spectra of GNRs and GNMs, it can be concluded that when the ribbon width is increased and, thus, the effect of quantum confinement is reduced, the spectra approach the absorption spectrum of graphene. The same

Effect of Ag loading position on the photocatalytic performance of TiO₂ nanocolumn arrays

• Jinghan Xu,
• Yanqi Liu and
• Yan Zhao

Beilstein J. Nanotechnol. 2020, 11, 717–728, doi:10.3762/bjnano.11.59

• the optical absorption spectra of TNC and AFT structure samples. It can be seen that the absorption peak of TiO2 is located at 276 nm and the absorption of the samples in the visible light portion increase as the thickness of Ag increases. Moreover, the increase of the Ag thickness does not hinder the

• absorption of TiO2 in the ultraviolet region. Figure 6b is the optical absorption spectra of ACT structure samples. It can be seen that, with the increase of Ag deposition, the visible absorption intensity of the samples increases gradually, but the absorption peak of TiO2 at 276 nm decreases obviously. The

• spectra and (c,d) bandgaps of the different samples. Photocatalytic activity for the degradation of MB: (a) UV–vis absorption spectra for the photocatalytic degradation of MB in the presence of AFT1 sample, (b) photocatalytic degradation rate of MB by different samples and pure MB under UV–vis light, (c

Soybean-derived blue photoluminescent carbon dots

• Shanshan Wang,
• Wei Sun,
• Dong-sheng Yang and
• Fuqian Yang

Beilstein J. Nanotechnol. 2020, 11, 606–619, doi:10.3762/bjnano.11.48

• significant n–π* absorption from the annealed-CDs. Coupling the UV–vis absorption spectra with the PL spectra, we suggest that the observed PL originates from excited states produced by the n–π* excitation or from functionalized surface groups. The time-correlated single photon counting (TCSPC) lifetime

Luminescent gold nanoclusters for bioimaging applications

• Nonappa

Beilstein J. Nanotechnol. 2020, 11, 533–546, doi:10.3762/bjnano.11.42

• easy oxidation, the extensive use in bioimaging remained a challenge. Therefore, efforts have been made to prepare silicon quantum dots (SQDs) [28]. SQDs exhibit relatively low cytotoxicity and better biocompatibility compared to SCQDs. Moreover, SQDs show broad absorption spectra, higher

Evolution of Ag nanostructures created from thin films: UV–vis absorption and its theoretical predictions

• Robert Kozioł,
• Marcin Łapiński,
• Paweł Syty,
• Damian Koszelow,
• Wojciech Sadowski,
• Józef E. Sienkiewicz and
• Barbara Kościelska

Beilstein J. Nanotechnol. 2020, 11, 494–507, doi:10.3762/bjnano.11.40

• quality of the nanostructures, in terms of their use as plasmonic platforms, is reflected in the UV–vis absorption spectra. The absorption spectrum is dominated by a maximum in the range of 450–500 nm associated with the plasmon resonance. As the initial layer thickness increases, an additional peak

• FDTD simulations are only capable to determine the absorption spectra. Results and Discussion Structure and UV–vis absorption The SEM results show that the formation of nanostructures from thin metallic layers is influenced by the initial layer thickness as well as the temperature and the time of

• nanostructures resulting from the thermal treatment (in view of the presence of plasmon resonance) is reflected in the UV–vis absorption spectra. The UV–vis spectrum of Ag nanostructures is quite complicated. It can be influenced by many factors, such as the size of nanostructures, their shape, changes in the

Preparation and in vivo evaluation of glyco-gold nanoparticles carrying synthetic mycobacterial hexaarabinofuranoside

• Gennady L. Burygin,
• Polina I. Abronina,
• Nikita M. Podvalnyy,
• Sergey A. Staroverov,
• Leonid O. Kononov and
• Lev A. Dykman

Beilstein J. Nanotechnol. 2020, 11, 480–493, doi:10.3762/bjnano.11.39

• or 4, which were purified from the excess of Ara6 glycosides 1 and 2 by centrifugation, or (3) were prepared in 0.9% NaCl from glyco-GNPs 3 or 4, which were purified by centrifugation, dissolved in 5% sucrose solution and then lyophilized. The absorption spectra of these solutions were virtually

• ) does not impair the stability of the prepared glyco-GNPs 3 and 4 against aggregation as follows from the similarity of the absorption spectra (Figure 4). The prepared glyco-GNPs with pendant Ara6 moieties (Ara6-GNPs 3 and 4) were used for the immunization of rabbits. The alkalinity of the immunogen

• (GNPs) (Ara6-GNPs 3 and 4, respectively). Transmission electron microscopy (TEM) images of Ara6-GNPs 3 (A) and 4 (B). The insets show size distribution diagrams with 15 nm average diameter in both cases. Absorption spectra of solutions of Ara6C2NH2-GNPs (3) (A) and Ara6C2EG7NH2-GNPs (4) (B), prepared

Interfacial charge transfer processes in 2D and 3D semiconducting hybrid perovskites: azobenzene as photoswitchable ligand

• Nicole Fillafer,
• Tobias Seewald,
• Lukas Schmidt-Mende and
• Sebastian Polarz

Beilstein J. Nanotechnol. 2020, 11, 466–479, doi:10.3762/bjnano.11.38

• successful functionalization. The UV–vis absorption spectra, shown in Figure 4F, confirm these findings. 3D-AzoC2 shows absorption maxima at 518 and 324 nm. The absorption at 518 nm is assigned to the excitonic bandgap of the perovskite. The absorption at 324 nm indicates the coordination of the azobenzene

• -resolved photoluminescence (PL) measurements of particles suspended in toluene were obtained using a FluoTime 300 from Picoquant spectrometer. Transient absorption spectra (TAS) were measured of drop-cast particles on glass substrates. NMR measurements of particles were carried out in a Bruker Avance III

• , 832, 765, 727 and 685 cm−1 are highlighted in grey as significant vibrations of the azobenzene. (F) Normalized UV–vis absorption spectra of 3D-AzoC2 dispersed in toluene (black) and AzoC2 in H2O (grey, dashed). (A) UV–vis absorption kinetics of 3D-AzoC2 in toluene over a time period of 600 s. (B

Nanoparticles based on the zwitterionic pillar[5]arene and Ag⁺: synthesis, self-assembly and cytotoxicity in the human lung cancer cell line A549

• Dmitriy N. Shurpik,
• Denis A. Sevastyanov,
• Pavel V. Zelenikhin,
• Pavel L. Padnya,
• Vladimir G. Evtugyn,
• Yuriy N. Osin and
• Ivan I. Stoikov

Beilstein J. Nanotechnol. 2020, 11, 421–431, doi:10.3762/bjnano.11.33

• , slit width 1 nm). Deionized water with a resistivity >18.0 MΩ cm was used to prepare the solutions. The deionized water was obtained from a Millipore-Q purification system. Recording of the absorption spectra of the mixtures of pillar[5]arenes 3 and 4 (1 × 10−5 М) with AgNO3 (1 × 10−4 М) was carried

Recent progress in perovskite solar cells: the perovskite layer

• Xianfeng Dai,
• Ke Xu and
• Fanan Wei

Beilstein J. Nanotechnol. 2020, 11, 51–60, doi:10.3762/bjnano.11.5

• C6H18N2O2PbI4 (EDBEPbI4) chains into 3D perovskites. The 2D/3D perovskites solved the discrepancy between PCE and stability. XRD patterns and UV–vis absorption spectra, retracing the formation of such heterojunctions, are shown in Figure 4b and Figure 4c. Doping with EDBEPbI4 gradually increases the grain size

• ][41][42][43][44][45][46][47][48][49][50][51]. Structural characterization and morphology. (a) Schematic illustration of the structure of the 2D/3D PSCs. (b) XRD patterns as a function of the 2D perovskite doping concentration and (c) UV–vis absorption spectra of the (EDBEPbI4)x(MAPbI3)1−x films. (d–g

Long-term stability and scale-up of noncovalently bound gold nanoparticle-siRNA suspensions

• Anna V. Epanchintseva,
• Julia E. Poletaeva,
• Dmitrii V. Pyshnyi,
• Elena I. Ryabchikova and
• Inna A. Pyshnaya

Beilstein J. Nanotechnol. 2019, 10, 2568–2578, doi:10.3762/bjnano.10.248

• buffers with different pH values by analyzing the optical absorption spectra in the range of 400–800 nm (Figure 2). We did not observe a wide peak in the range of 650–700 nm, which would indicate nanoparticle aggregation. This peak appeared only in the case of mixing of the AuNP-siRNA suspension with the

pH-Controlled fluorescence switching in water-dispersed polymer brushes grafted to modified boron nitride nanotubes for cellular imaging

• Saban Kalay,
• Yurij Stetsyshyn,
• Volodymyr Donchak,
• Khrystyna Harhay,
• Ostap Lishchynskyi,
• Halyna Ohar,
• Yuriy Panchenko,
• Stanislav Voronov and
• Mustafa Çulha

Beilstein J. Nanotechnol. 2019, 10, 2428–2439, doi:10.3762/bjnano.10.233

• the excitation and emission wavelengths were selected at 490 nm and 520 nm, respectively, and the fluorescently labeled nanomaterial was viewed. Ultraviolet–visible spectrometry (UV–vis) The optical absorption spectra of the BNNT suspension were registered on a double-beam UV–vis spectrophotometer

• microscopy. Figure 4a shows the absorption spectra of BNNTs, oligoperoxide-functionalized BNNTs, and P(AA-co-FA)-functionalized BNNTs dispersed in water. P(AA-co-FA)-functionalized BNNTs demonstrate a strong absorption band at λ = 490 nm, which is very close to the maximum adsorption peak of fluorescein

Design of a nanostructured mucoadhesive system containing curcumin for buccal application: from physicochemical to biological aspects

• Sabrina Barbosa de Souza Ferreira,
• Gustavo Braga,
• Évelin Lemos Oliveira,
• Jéssica Bassi da Silva,
• Hélen Cássia Rosseto,
• Lidiane Vizioli de Castro Hoshino,
• Mauro Luciano Baesso,
• Wilker Caetano,
• Craig Murdoch,
• Helen Elizabeth Colley and
• Marcos Luciano Bruschi

Beilstein J. Nanotechnol. 2019, 10, 2304–2328, doi:10.3762/bjnano.10.222

• be permeated. The permeation of CUR from polymer blends containing P407 and C974P® were performed in porcine mucosa by photoacoustic spectroscopy and the photoacoustic spectra of the formulations, tissues and permeation of CUR are shown in Figure 11. The optical absorption spectra of CUR and

Design and facile synthesis of defect-rich C-MoS₂/rGO nanosheets for enhanced lithium–sulfur battery performance

• Chengxiang Tian,
• Juwei Wu,
• Zheng Ma,
• Bo Li,
• Pengcheng Li,
• Xiaotao Zu and
• Xia Xiang

Beilstein J. Nanotechnol. 2019, 10, 2251–2260, doi:10.3762/bjnano.10.217

• (3 mL) as the adsorbents. Ultraviolet–visible (UV–vis) absorption spectra of these diluted solutions were collected using a Shimadzu UV 2550 spectrophotometer. Cell assembly and electrochemical measurements The working electrodes were prepared by casting a slurry of 80 wt % active materials (MoS2-S

• absorption spectra of the four solutions were also investigated to better understand the adsorption capacity. Li2S6 in solution is still not completely absorbed by the C-MoS2/rGO-4 and C-MoS2/rGO-8 composites as shown in Figure S4a (Supporting Information File 1). Consequently, the colorless solution of C

• of pristine MoS2, and C-MoS2/rGO and C-MoS2/rGO-6 composites. (c) TG curves of MoS2-S, C-MoS2/rGO-S and C-MoS2/rGO-6-S composites; (d) UV–vis absorption spectra of the pure Li2S6 solution and Li2S6 solutions with pristine MoS2, and C-MoS2/rGO and C-MoS2/rGO-6 composites (inset: photos of the Li2S6

Nontoxic pyrite iron sulfide nanocrystals as second electron acceptor in PTB7:PC₇₁BM-based organic photovoltaic cells

• Olivia Amargós-Reyes,
• José-Luis Maldonado,
• Omar Martínez-Alvarez,
• María-Elena Nicho,
• José Santos-Cruz,
• Juan Nicasio-Collazo,
• Irving Caballero-Quintana and
• Concepción Arenas-Arrocena

Beilstein J. Nanotechnol. 2019, 10, 2238–2250, doi:10.3762/bjnano.10.216

• characteristics could facilitate exciton dissociation, charge transport and collection processes, and thus increase the overall PCE value. Figure 5a shows the UV–vis absorption spectra of the OPV active layer at different concentrations of FeS2 as well as that of the pure FeS2 film. The spectrum of the PTB7

• :PC71BM active layer presents a broad absorption in the visible range (300 to 750 nm). In all absorption spectra, PTB7 peaks appeared at 630 and 700 nm and PC71BM peaks were observed at 375 and 480 nm, as reported elsewhere [51]. The FeS2 NCs do not contribute to the absorption spectra and the light

Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique

• Tushar C. Jagadale,
• Dhanya S. Murali and
• Shi-Wei Chu

Beilstein J. Nanotechnol. 2019, 10, 2182–2191, doi:10.3762/bjnano.10.211

• precisely the scattering and absorption spectra, of metallic nanostructures can be completely different from their bulk counterparts. Plasmonic nanostructures, in general, are characterized by strong scattering, great photo-stability, high brightness and exceptional localization precision. In addition, SPR

Porous silver-coated pNIPAM-co-AAc hydrogel nanocapsules

• William W. Bryan,
• Riddhiman Medhi,
• Maria D. Marquez,
• Supparesk Rittikulsittichai,
• Michael Tran and
• T. Randall Lee

Beilstein J. Nanotechnol. 2019, 10, 1973–1982, doi:10.3762/bjnano.10.194

• of pDADMAC on the hydrogel particle surface, we analyzed the particles with Fourier transform infrared (FTIR) spectroscopy. Figure 1f shows the absorption spectra of pure pDADMAC and the modified hydrogel particles. The existence of stretching associated with the CH3 components at ≈1465 cm−1 and