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252 results for “Doping”
Incorporation of nitrogen-doped carbon dots synthesized from pomelo peels into PVA as highly antioxidant and UV-blocking food packaging film
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Preparation of Phosphorus doping modification of porous boron nitride and its adsorption characteristics for heavy metals in flue gas
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Data from: Facile fabrication of Mn2+ doped ZnO photocatalysts by electrospinning
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DOPE in water (500 ns) run4
<p>DOPE (128 lipids) in water (TIP3P, 4608).</p> <p>500 ns, output every 50 ps.</p> <p>Run with gromacs/5.1.2</p>
DOPE in water (500 ns) run1
<p>DOPE (128 lipids) in water (TIP3P, 4608).</p> <p>500 ns, output every 50 ps.</p> <p>Run with gromacs/5.1.2</p>
DOPE in water (500 ns) run2
<p>DOPE (128 lipids) in water (TIP3P, 4608).</p> <p>500 ns, output every 50 ps.</p> <p>Run with gromacs/5.1.2</p>
Nitrogen‐Doped Carbons with Hierarchical Porosity via Chemical Blowing Towards Long‐Lived Metal‐Free Catalysts for Acetylene Hydrochlorination
<p>Porous nitrogen-doped carbons (NCs) are sustainable alternatives to the toxic mercury-based acetylene hydrochlorination catalysts applied in the manufacture of polyvinyl chloride. However, the application of NCs as metal-free catalysts is hampered by their insufficient durability under industrially relevant process conditions. In particular, pore blockage leads to accelerated deactivation of NCs compared to the state-of-the-art precious metal-based systems. Herein, we develop a salt template-assisted synthesis strategy coupled with chemical blowing to tune the textural properties of NCs, while preserving the N-content and speciation. The addition of metal salts (i.e., Mg(OAc)2 or CaCO3) enhances gas evolution, leading to an increased formation of micro- and mesopores, while the in-situ generated CaO/CaCl2 and MgO/MgCl2 develop auxiliary pore networks. Micropores are easily blocked during acetylene hydrochlorination, but meso- and macropores are structurally stable, enhancing the lifetime of hierarchical NCs by ca. 50 times compared to their non-templated analogues, rivalling the stability of benchmark metal-based catalysts.</p>
Data from: Structural modification of isomorphous SO42−-doped K2FeO4 for remediating the stability and enhancing the discharge of super-iron battery
In the paper, the isomorphous SO42- doped K2FeO4, aimed at the remediation of the discharge and stability of the super-iron battery, was first synthesized for doping and reforming the K2FeO4 crystalline structure via a facile coprecipitation and mechanochemistry. Afterward, the compared cathodes were assembled by the undoped and doped K2FeO4 for an evaluation of the discharge and stability in the AAA super-iron battery system. The results show that the small amounts of K2SO4 were doped into the K2FeO4 in the calculated form of K2Fe1-xSxO4 by the isomorphous substitution. The doped K2FeO4 cathodes/batteries exhibited an excellent discharge with a normal discharge profile. The cathodes doped by two techniques had significantly enhanced the discharge capacity of the super-iron battery with an increase of 10-30% compared to the undoped K2FeO4. Moreover, the stability of the K2FeO4 cathodes was obviously remediated by the isomorphous SO42- doping. The shelf time of the doped K2FeO4 cathodes was prolonged by an increase of about 10% in comparison of the undoped K2FeO4 cathode. The desirable enhancements could be attributed to doping and reforming the similar building block and isomorphous SO42- into the FeO42- tetrahedral and crystalline in the form of the isomorphous substitution and filling vacancies.
Data from: The thermoelectric properties of Au nanoparticle-incorporated Al-doped mesoporous ZnO thin films
Mesoporous Al-doped ZnO thin films incorporated with gold nanoparticles (Au NPs) were synthesized using a sol-gel and evaporation-induced self-assembly process. In this work, the complementary effects of Au NP incorporation and Al doping on the mesoporous ZnO thin films' thermoelectric properties were analyzed. The incorporated Au NPs induced an increase in electrical conductivity but a detriment in the pore arrangement of the mesoporous ZnO thin film, which was accompanied by a decrease in porosity. However, the addition of the Al dopant minimized the pore structural collapse because of the inhibition of the grain growth in the ZnO skeletal structure, resulting in an enhancement of the pore arrangement and porosity. When the Au NPs and Al dopant were added at the same time, the degradation in the pore structure was minimized and the electrical conductivity was effectively increased but the absolute value of the Seebeck coefficient was decreased. However, as a result, the thermoelectric power factor was increased by 2.4 times compared to the pristine mesoporous ZnO thin film. It was found that co-introducing the Au NPs and Al doping to the mesoporous ZnO structure was effective in preserving the pore structure and increasing the electric conductivity, thereby enhancing the thermoelectric property of the mesoporous ZnO thin film.
Data from: Doping induced dielectric anomaly below the Curie temperature in molecular ferroelectric diisopropylammonium bromide
A dielectric anomaly induced by doping has been observed at about 340 K in chlorine doped diisopropylammonium bromide (DIPAB-C). The dielectric anomaly has a switchable behavior, which indicates potential applications on switches and sensors. Temperature dependent Raman spectrum, X-ray diffraction and DSC do not show any anomaly around the dielectric anomaly temperature, which prove that the dielectric anomaly does not come from structure phase transition and has no specific heat variety. It is assumed that this relaxation process can be attributed to the freezing of ferroelectric domain walls induced by the pinning of point defects.
Data from: Topological, chemical, and electro-optical characteristics of riboflavin-doped artificial and natural DNA thin films
DNA is considered as a useful building bio-material, and it serves as an efficient template to align functionalized nanomaterials. Riboflavin (RF)-doped synthetic double-crossover DNA (DX-DNA) lattices and natural salmon DNA (SDNA) thin films are constructed using substrate assisted growth and drop-casting methods, respectively, and their topological, chemical, and electro-optical characteristics were evaluated. The critical doping concentration of RF ([RF]C, ~5 mM) at given concentrations of DX-DNA and SDNA were obtained by observing the phase transition (from crystalline to amorphous structures) of DX-DNA and precipitation of SDNA in solution above [RF]C. [RF]C are verified by analyzing the atomic force microscopy images for DX-DNA and current, absorbance, and photoluminescence for SDNA. We study the physical characteristics of RF-embedded SDNA thin films, which are the Fourier transform infrared (FTIR) spectrum to understand the interaction between the RF and DNA molecules, current to evaluate the conductance, absorption to understand the RF binding to the DNA, and photoluminescence (PL) to analyze the energy transfer between the RF and DNA. The current and UV absorbance band of SDNA thin films decrease up to [RF]C followed by an increase above [RF]C. In contrast, the PL intensity illustrates the reverse trend, as compared to the current and UV absorbance behavior as a function of the varying [RF]. Due to the intense PL characteristic of RF, the DNA lattices and thin films with RF might offer immense potential to develop efficient bio-sensors and useful bio-photonic devices.
Data from: Nitrogen and chlorine co-doped carbon dots as probe for sensing and imaging in biological samples
A facile one step hydrothermal synthesis approach was proposed to prepare nitrogen and chlorine co-doped carbon dots using l-ornithine hydrochloride as the sole precursor. The configuration and component of carbon dots were characterized by TEM, XPS, and FTIR. The obtained CDs (Orn-CDs) with a mean diameter of 2.1 nm were well monodispersed in aqueous solutions. The as-prepared CDs exhibited a bright blue fluorescence with a high yield of 60%, good photostability and low cytotoxicity. The emission of Orn-CDs could be selectively and effectively suppressed by Fe3+. Thus, a quantitative assay of Fe3+ was realized by this nanoprobe with a detection limit of 95.6 nmol L-1 in the range of 0.3-50 µmol L-1. Furthermore, ascorbic acid could recover the fluorescence of Orn-CDs suppressed by Fe3+, owing to the transformation of Fe3+ to Fe2+ by ascorbic acid. The limit of detection for ascorbic acid was 137 nmol L-1 in the range of 0.5-10 µmol L-1. In addition, the established method was successfully applied for Fe3+ and ascorbic acid sensing in human serum and urine specimans and for imaging of Fe3+ in living cells. With merits of low economic cost, easy to scale up, without additional functionalized and sample pretreatment, Orn-CDs based sensing platform showed its potential to be used for biomedical related study.
Supplementary Information "Fabrication and characterization of narrow wavelength phosphors of Tb-doped yttrium-silicon-aluminum oxynitride using spray pyrolysis"
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Through-space hopping transport in an iodine-doped perylene-based metal–organic framework
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Nd3+-Doped Lanthanum Oxychloride Nanocrystals as Nanothermometers
<p>Related publication: Renero-Lecuna, C; Herrero, A; Jimenez de Aberasturi, D; Martínez-Flórez, M; Valiente, R; Mychinko, M; Bals, S; Liz-Marzán, LM. Nd3+-Doped Lanthanum Oxychloride Nanocrystals as Nanothermometers. <em>J. Phys. Chem. C</em> <strong>2021</strong>, 10.1021/acs.jpcc.1c05828</p>
Supplementary Material: Low temperature photoluminescence investigation of light-induced degradation in boron doped CZ-silicon
<p>Dataset from the paper: Low temperature photoluminescence investigation of light-induced degradation in boron doped CZ-silicon.</p>
Application of sulfur and nitrogen doped carbon quantum dots as sensitive fluorescent nanosensors for the determination of saxagliptin and gliclazide
<p>In this study, highly fluorescent sulfur and nitrogen doped carbon quantum dots (S,N-CQDs) were used as fluorescent nanosensors for direct spectrofluorimetric estimation of each of gliclazide and saxagliptin without any pre-derivatization steps for the first time. S,N-CQDs were synthesized employing a simple hydrothermal technique using citric acid and thiosemicarbazide. The produced S,N-CQDs were characterized using different techniques including fluorescence emission spectroscopy, UV spectrophotometry, high resolution transmission electron microscopy, and FT-IR spectroscopy. Following excitation at 360 nm, S,N-CQDs exhibited a strong emission peak at 430 nm. The native fluorescence of S,N-CQDs was quantitatively enhanced by addition of increased concentrations of the studied drugs. The fluorescence enhancement of S,N-CQDs and the concentrations of the studied drugs revealed a wide linear relationship in the range of 30.0-500.0 μM and 75.0-600.0 µM with limits of detection of 5.0 μM and 10.15 µM for gliclazide and saxagliptin, respectively. The proposed method was efficiently utilized for determination of cited drugs in their commercial tablets with % recoveries ranging from 98.6 to 101.2% and low % RSD values (less than 2%). The mechanism of interaction between S,N-CQDs and the two drugs was studied. Validation of the proposed method was carried out in accordance with ICH guidelines.</p>
Computational Screening Data of Transition Metal-Doped CdS for Photocatalytic Hydrogen Production
<p>Data access for the paper publication.</p>
DFT run directory for H doped VO2 phases
<p>VASP calculation directory for hydrogenated VO2 phases.</p>
Data for: Origin and fate of the pseudogap in the doped Hubbard model
<p>Data for publication "Origin and fate of the pseudogap in the doped Hubbard model"</p>
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