High-responsivity hybrid α-Ag₂S/Si photodetector prepared by pulsed laser ablation in liquid

• Raid A. Ismail,
• Hanan A. Rawdhan and
• Duha S. Ahmed

Beilstein J. Nanotechnol. 2020, 11, 1596–1607, doi:10.3762/bjnano.11.142

• the ablation process. The vessel was covered with a thin glass slide to prevent the vapor from reaching the laser focusing lens. The optical absorbance of the colloidal Ag2S NPs was measured by using a UV–vis double-beam spectrophotometer (Lambda 750, Perkin Elmer). The thiourea solution was used as

Role of redox-active axial ligands of metal porphyrins adsorbed at solid–liquid interfaces in a liquid-STM setup

• Thomas Habets,
• Sylvia Speller and
• Johannes A. A. W. Elemans

Beilstein J. Nanotechnol. 2020, 11, 1264–1271, doi:10.3762/bjnano.11.110

• . Also the first Q-band has blueshifted by 21 nm, and a larger background absorbance is observed. These spectral changes indicate that the molecules of MnTUPCl are reactive in the STM setup under the influence of the bias voltage. Following our hypotheses described above, the solution might also contain

Ultrasensitive detection of cadmium ions using a microcantilever-based piezoresistive sensor for groundwater

• Dinesh Rotake,
• Anand Darji and
• Nitin Kale

Beilstein J. Nanotechnol. 2020, 11, 1242–1253, doi:10.3762/bjnano.11.108

• ), b) Au-Cys-DL-GC(4), c) Au-Cys-DL-GC(5), d) Au-Cys-DL-GC(6) and e) Au-Cys-DL-GC(7). FTIR absorbance spectra of a Cd(II)/DL-GC/Cys/Au/Ti coating. EDX measurement of a SAM of cysteamine (Cys)-cross-linked ᴅʟ-glyceraldehyde (Cys-DL-GC). (a) Scan area for analysis, (b) table with detected elements, (c–f

Gram-scale synthesis of splat-shaped Ag–TiO₂ nanocomposites for enhanced antimicrobial properties

• Mohammad Jaber,
• Asim Mushtaq,
• Kebiao Zhang,
• Jindan Wu,
• Dandan Luo,
• Zihan Yi,
• M. Zubair Iqbal and
• Xiangdong Kong

Beilstein J. Nanotechnol. 2020, 11, 1119–1125, doi:10.3762/bjnano.11.96

• containing the NCs were added to the wells and the cells were incubated for 24 and 48 h. A 10% CCK-8 assay solution was added to the media at the indicated times and incubated for an another one hour. Finally, the absorbance was measured using a microplate reader at a wavelength of 450 nm. Antibacterial test

Uniform Fe₃O₄/Gd₂O₃-DHCA nanocubes for dual-mode magnetic resonance imaging

• Miao Qin,
• Yueyou Peng,
• Mengjie Xu,
• Hui Yan,
• Yizhu Cheng,
• Xiumei Zhang,
• Di Huang,
• Weiyi Chen and
• Yanfeng Meng

Beilstein J. Nanotechnol. 2020, 11, 1000–1009, doi:10.3762/bjnano.11.84

• culture medium was discarded and fresh media was added containing 15, 30, 45, and 60 μg/mL FGDA nanocubes, respectively. A cell counting kit (CCK-8) was used to evaluate the nanocube cytotoxicity at 12, 24, and 48 h. The absorbance was detected using a microplate reader (Biorad iMark, USA) at a wavelength

A 3D-polyphenylalanine network inside porous alumina: Synthesis and characterization of an inorganic–organic composite membrane

• Jonathan Stott and
• Jörg J. Schneider

Beilstein J. Nanotechnol. 2020, 11, 938–951, doi:10.3762/bjnano.11.78

• . Subsequently, the concentration of chloroanilic acid in the collected solution was determined with UV–vis-spectroscopy. The amount of adsorbed chloroanilic acid was calculated from the absorbance of the analyte stock solution (see Figure 12). Unfunctionalized ALOX-membranes adsorb 16.7% of chloroanilic acid

• °C under air atmosphere for different polyphenylalanine functionalized ALOX-membranes. Absorbance values of the water fractions with chloroanilic acid after the loading step. Assignment of NIR bands of polyphenylalanine grafted on ALOX [64]. Assignment of the combination bands with NH-stretching and

Light–matter interactions in two-dimensional layered WSe₂ for gauging evolution of phonon dynamics

• Avra S. Bandyopadhyay,
• Chandan Biswas and
• Anupama B. Kaul

Beilstein J. Nanotechnol. 2020, 11, 782–797, doi:10.3762/bjnano.11.63

• constrained by the substrate. However, the three-phonon anharmonic effect still presides in the low-T range for the A1g mode [26]. As a result of this the nonlinear perturbations were found to be persistent in the A1g mode even at high temperature. Additionally, the laser absorbance efficiency in WSe2 will

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

• to start the photocatalysis. Every 10 min, an aliquot of 2 mL was transferred into a UV–vis cuvette, and the change in absorbance was measured using a UV–vis spectrophotometer (Shimadzu, UV-3600). After the measurement was completed, the solution was poured back into the beaker to keep the total

• indirect bandgap semiconductor, since the grains are small and the energy levels are discrete: In Equation 1, h is Plank’s constant (6.626 × 10−34 J s), ν is the frequency of light, and Eg represents the bandgap energy. For the calculation of Eg by the Tauc plot absorbance the value of the absorption (Abs

• these experiments, the degradation efficiency can be described by the Lambert–Beer law and the Langmuir–Hinshelwood model as follows: where Abs. is the solution absorbance, a is the solution absorbance coefficient, b is the optical path, C is the solution concentration, C0 is the initial concentration

Exfoliation in a low boiling point solvent and electrochemical applications of MoO₃

• Matangi Sricharan,
• Bikesh Gupta,
• Sreejesh Moolayadukkam and
• H. S. S. Ramakrishna Matte

Beilstein J. Nanotechnol. 2020, 11, 662–670, doi:10.3762/bjnano.11.52

• performed using a similar protocol. After sonication, the dispersions were allowed to rest for 12 h before centrifuging at 500 rpm (REMI Neya-12) for 1 h to remove non-exfoliated flakes. Small aliquots were collected at regular time intervals in order to measure the concentration. The absorbance of the MoO3

• study the exfoliation efficiency, different initial concentrations (Ci) of MoO3 (5, 7.5, 10 and 20 mg·mL−1) were sonicated for 1 h using probe sonication. The UV–vis spectra of the dispersions were collected and the absorbance per unit length (A/l) is shown in Figure 1a. As Ci of the dispersion

Preparation, characterization and photocatalytic performance of heterostructured CuO–ZnO-loaded composite nanofiber membranes

• Wei Fang,
• Liang Yu and
• Lan Xu

Beilstein J. Nanotechnol. 2020, 11, 631–650, doi:10.3762/bjnano.11.50

• measuring the maximum absorbance of methyl orange at 465 nm using a UV spectrophotometer (Cary 5000, Agilent Technologies, USA). Each photocatalytic degradation experiment was performed three times. Results and Discussion Characterization of electrospun Cu(Ac)2/Zn(Ac)2/PVDF/PAN CNFMs Cu(Ac)2/Zn(Ac)2/PVDF

• CNFMs were electrospun PVDF/PAN CNFMs, CuO-loaded PVDF/PAN CNFMs, ZnO-loaded PVDF/PAN CNFMs and heterostructured CuO-ZnO–loaded PVDF/PAN CNFMs, named A, B, C and D, respectively. The measured absorbance as a function of the time in the degradation process is shown in Table 5 and Figure 23. The

• . Absorbance and degradation rate of methyl orange solutions functions of the time using samples A, B, C and D. Degradation rates during consecutive photocatalytic degradation experiments using the sample D. Funding The work is supported financially by National Natural Science Foundation of China (Grant No

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

• , annealed-CDs and LA-CDs-10% are depicted in Figure 3d. There are three peaks at 208, 253 and 293 nm for the HTC-CDs. The peak at 208 nm is from the π–π* transition of the conjugated C=C bond on the backbone of carbon [36], and the broad absorbance peaks at 253 and 293 nm are from the n–π* transition of the

• carbonyl and other oxygen or nitrogen-containing groups [37]. There is no visible peak for the annealed-CDs, which exhibited continuous, weak absorbance in the wavelength range of 200 to 600 nm. Such a result suggests that the annealed-CDs are conductive and the corresponding bandgap is zero [38]. For the

• ) HTC-CDs, (b) annealed-CDs (annealing temperature: 850 °C), and (c) LA-CDs-10%; the size distribution of soybean-derived nanoparticles: (d) HTC-CDs, (e) annealed-CDs, and (f) LA-CDs-10%. Photoluminescence spectra of: (a) HTC-CDs, (b) annealed-CDs, and (c) LA-CDs-10%; (d) UV–vis absorbance spectra of

Adsorptive removal of bulky dye molecules from water with mesoporous polyaniline-derived carbon

• Hyung Jun An,
• Jong Min Park,
• Nazmul Abedin Khan and
• Sung Hwa Jhung

Beilstein J. Nanotechnol. 2020, 11, 597–605, doi:10.3762/bjnano.11.47

• demand (COD) levels. Additionally, dyes decrease sunlight penetration through water, decreasing the natural restoration activity of rivers. Moreover, dyes in waste water are also considered problematic in the aesthetic sense, since the absorbance of dyes is usually very high (therefore, even small

Luminescent gold nanoclusters for bioimaging applications

• Nonappa

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

• : glutathione; NAC: N-acetylcysteine; MTU: 5-methyl-2-thiouracil). D) Structures of biomolecular ligands (HSA: human serum albumin, PDB ID IE78; BSA: bovine serum albumin, PDB ID 3VO3, and Lys: lysozyme, PDB ID 3WUN). E) Schematic representation showing Au-BSA NC synthesis. F) Absorbance and fluorescence

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

• appears around 350 nm, which probably corresponds to the quadrupole resonance. For calculations leading to a better illustration of absorption, scattering and overall absorption of light in Ag nanoparticles, the Mie theory is employed. Absorbance and the distribution of the electromagnetic field around

• corroborated by FDTD calculations showing the distribution of the electromagnetic field around the Ag nanoparticles, as well as the calculated absorbance. Analytical solutions of the electromagnetic field distribution in plasmonic platforms are known for very simple nanoparticles with spherical or cylindrical

• pulse was set to rectangular. The pulse duration was set to 20 fs and the overall simulation time to 100 fs. This was enough to observe plasmonic decay. The field was calculated in a plane located 10 nm above the substrate. For calculations of the absorbance, the pulse shape was set to sinusoidal. 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

• contents. The solution was allowed to cool by incubation at room temperature for 15 min. Absorbance was measured in 1 cm quartz cuvettes on a Specord 250 spectrophotometer (Analytik, Jena, Germany) at 490 nm using solutions of the parent glycoside 1 for calibration. The calculation also took into

• reaction was stopped with 100 μL of 1 N H2SO4. The absorbance at 492 nm was read on a Multiskan Ascent analyzer (Thermo). Absorbance values at 492 nm for the wells without bacterial cells were using as the control. Data were processed with Microsoft Excel 2003 software (Microsoft Corp.); 95% confidence

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

• only discuss the results for AzoC2, all other ligands behave very similarly and the data can be found in Supporting Information File 1, Figures S10–S12. A solution of AzoC2 in purified H2O (c = 10−5 M) was irradiated at 313 nm and the absorbance was measured at certain time intervals. The absorption

Electrochemically derived functionalized graphene for bulk production of hydrogen peroxide

• Munaiah Yeddala,
• Pallavi Thakur,
• Anugraha A and
• Tharangattu N. Narayanan

Beilstein J. Nanotechnol. 2020, 11, 432–442, doi:10.3762/bjnano.11.34

• H2O2. The H2O2 produced through ORR is also quantified using a Ce(SO4)2 solution assisted UV–visible absorbance based analysis, where the details and calibration are given in Supporting Information File 1. Figure 7a shows chronoamperograms of ORR on EEG-coated graphite papers at 0.358 V vs RHE in 0.1 M

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

• ) was added to the wells. The plates were incubated at 37 °C for 4 h. Then the medium was aspirated from the wells and 100 μL of DMSO (to dissolve the crystals) was added to each well. The probes were incubated at 37 °C for 5 min. The absorbance was measured at 570 nm using a xMark spectrophotometer

Synthesis and enhanced photocatalytic performance of 0D/2D CuO/tourmaline composite photocatalysts

• Changqiang Yu,
• Min Wen,
• Zhen Tong,
• Shuhua Li,
• Yanhong Yin,
• Xianbin Liu,
• Yesheng Li,
• Tongxiang Liang,
• Ziping Wu and
• Dionysios D. Dionysiou

Beilstein J. Nanotechnol. 2020, 11, 407–416, doi:10.3762/bjnano.11.31

• clarified by centrifugation for the measurement of absorbance, which can be used to monitor the progress of the photocatalytic degradation reactions. For the durability test, the used photocatalyst was firstly rinsed with ethanol and deionized water by centrifugation, then it was collected by using aqueous

Brome mosaic virus-like particles as siRNA nanocarriers for biomedical purposes

• Alfredo Nuñez-Rivera,
• Pierrick G. J. Fournier,
• Danna L. Arellano,
• Ana G. Rodriguez-Hernandez,
• Rafael Vazquez-Duhalt and
• Ruben D. Cadena-Nava

Beilstein J. Nanotechnol. 2020, 11, 372–382, doi:10.3762/bjnano.11.28

• calculated by measuring the UV absorbance using a Nanodrop 2000c spectrophotometer (ThermoFisher Scientific). All the procedures were performed at 4 °C. Finally, the purified viruses were stored at −80 °C in 1.5 mL microcentrifuge tubes. Cell cultures The breast tumor cell lines MDA-MB-231 and MCF-7 were

• virions per cell), PEGylated or non-functionalized capsids, or as positive control lipopolysaccharides (2.5 or 75 ng/mL). Then, 50 µL of supernatant was transferred into a new 96-well plate and 150 µL of Quantity Blue (InvivoGen) reagent was added and incubated at 37 °C for 1 h. The absorbance at 655 nm

Poly(1-vinylimidazole) polyplexes as novel therapeutic gene carriers for lung cancer therapy

• Gayathri Kandasamy,
• Elena N. Danilovtseva,
• Vadim V. Annenkov and
• Uma Maheswari Krishnan

Beilstein J. Nanotechnol. 2020, 11, 354–369, doi:10.3762/bjnano.11.26

• incubation for specified periods of time (24 h or 48 h). MTS reagent (20 µL) along with 200 µL of serum-free media was added to each sample well and incubated at 37 °C for 2 h. The reaction was terminated with 10% sodium dodecyl sulfate (SDS) solution. The absorbance was read at 490 nm using a multimode

Using gold nanoparticles to detect single-nucleotide polymorphisms: toward liquid biopsy

• María Sanromán Iglesias and
• Marek Grzelczak

Beilstein J. Nanotechnol. 2020, 11, 263–284, doi:10.3762/bjnano.11.20

• gold nanoparticles are their optical properties, which yield an exceptional light absorbance in the visible spectral range. This is explained by the fact that in the metallic core, the conductive electrons experience coherent oscillations in the presence of incoming electromagnetic radiation, thereby

• nanoparticle amplification. b) Optical characterization of the assay solution spiked with different amounts of c.2573 T>G mutant EGFR gene in the presence of a background wild-type EGFR sequence, showing a specificity down to 1%. c) The relation of increased absorbance with increasing the relative

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

• -step process owing to their improved crystal quality, crystal size, absorbance and stability. Furthermore, the perovskite films fabricated by the mesh-assisted grid technique are of controllable transparency and have shown the potential to be scalable. These attributes provide a promising route for the

The different ways to chitosan/hyaluronic acid nanoparticles: templated vs direct complexation. Influence of particle preparation on morphology, cell uptake and silencing efficiency

• Arianna Gennari,
• Julio M. Rios de la Rosa,
• Erwin Hohn,
• Maria Pelliccia,
• Enrique Lallana,
• Roberto Donno,
• Annalisa Tirella and
• Nicola Tirelli

Beilstein J. Nanotechnol. 2019, 10, 2594–2608, doi:10.3762/bjnano.10.250

• , cells were washed with PBS and incubated for 1 h at 37 °C in medium containing 5% (v/v) of MTS solution. Cell viability was measured by reading the absorbance values at 490 nm (Synergy2 Biotek plate reader using Gen5 software) and normalized against the total protein content in each well (BCA assay

• ). Please note that any influence of phenol-red was ruled out by using medium as blank and subtracting its absorbance to all wells before calculating metabolic activity. Quantification of cell uptake. HCT-116 (20,000 cells/cm2) and RAW 264.7 (30,000 cells/cm2) were seeded in 12-well plates and left to

Fully amino acid-based hydrogel as potential scaffold for cell culturing and drug delivery

• Dávid Juriga,
• Evelin Sipos,
• Orsolya Hegedűs,
• Gábor Varga,
• Miklós Zrínyi,
• Krisztina S. Nagy and
• Angéla Jedlovszky-Hajdú

Beilstein J. Nanotechnol. 2019, 10, 2579–2593, doi:10.3762/bjnano.10.249

• proliferation reagent WST-1. The reagent was diluted (1:20) with αMEM containing no phenol red (Gibco, USA). Then, 200 μL solution was applied in each well. After incubation for 2 h at 37 °C, 150 μL of the supernatant solution was transferred from each well into an empty 96-well plate. The absorbance was