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Materials (Basel, Switzerland) Jun 2024In this study, an electrode slurry composed of molybdenum disulfide (MoS) and vapor-grown carbon fiber (VGCF) prepared through a solid-phase synthesis method was...
In this study, an electrode slurry composed of molybdenum disulfide (MoS) and vapor-grown carbon fiber (VGCF) prepared through a solid-phase synthesis method was blade-coated onto copper foil to form a thick film as the anode for lithium-ion batteries. In previously reported work, MoS-based lithium-ion batteries have experienced gradual deformation, fracture, and pulverization of electrode materials during the charge and discharge cycling process. This leads to an unstable electrode structure and rapid decline in battery capacity. Furthermore, MoS nanosheets tend to aggregate over charge and discharge cycles, which diminishes the surface activity of the material and results in poor electrochemical performance. In this study, we altered the density of the MoS-carbon fiber/Cu foil anode electrode by rolling. Three different densities of electrode sheets were obtained through varying rolling repetitions. Our study shows the best electrochemical performance was achieved at a material density of 2.2 g/cm, maintaining a capacity of 427 mAh/g even after 80 cycles.
PubMed: 38930194
DOI: 10.3390/ma17122825 -
Life (Basel, Switzerland) Jun 2024Expression of microRNAs, such as miR-365, is known to be dysregulated in many tumors, including oral cancers, although little is known about their role or functions. The...
Expression of microRNAs, such as miR-365, is known to be dysregulated in many tumors, including oral cancers, although little is known about their role or functions. The objective of this project is to evaluate the downstream targets of miR-365 to determine any potential pathways or effects. Downstream targets for miR-365 (miRdatabase target scores > 90) were used for qPCR screening of oral cancer cell lines (SCC4, SCC9, SCC15, SCC25, CAL27). Each oral cancer cell line expressed miR-365 downstream targets molybdenum cofactor synthesis-2 (MOCS2), erythropoietin receptor (EPOR), IQ motif containing-K (IQCK), carboxypeptidase A3 (CPA3), solute carrier family 24 member-3 (SLC24A3), and coiled-coil domain containing 47 (CCDC47)-although the expression levels varied somewhat. However, differential results were observed with ubiquitin protein ligase E3 component n-recognin-3 (UBR3), nudix hydrolase-12 (NUDT12), zinc finger CCHC-type containing-14 (ZCCHC14), and homeobox and leucine zipper encoding (HOMEZ). These data suggest that many of the miR-365 targets are expressed in the oral cancers screened, with the differential expression of UBR3, ZCCHC14, HOMEZ, and NUDT12, which may be correlated with chemoresistance among two specific oral cancer cell lines (SCC25, SCC9). These results suggest this differential expression may signal potential targets for patient treatment with tumors exhibiting miR-365 and chemotherapeutic resistance.
PubMed: 38929724
DOI: 10.3390/life14060741 -
Water Research Jun 2024With the increasing production and application, more molybdenum disulfide (MoS) nanosheets could be released into environment. The aggregation and dispersion of MoS...
With the increasing production and application, more molybdenum disulfide (MoS) nanosheets could be released into environment. The aggregation and dispersion of MoS nanosheets profoundly impact their transport and transformation in the aquatic environment. However, the colloidal stability of MoS remains largely unknown in natural surface waters. This study investigated the colloidal stability of MoS nanosheets in six natural surface waters affected by both light irradiation and water chemistry. Compared to that of the pristine MoS nanosheets, the colloidal stability of MoS photoaged in ultrapure water declined. Light irradiation induced the formation of Mo-O bonds, the release of SO species, and the decrease in 1T/2H ratio which reduced negative charge and enhanced hydrophobicity. However, the colloidal stability of MoS photoaged in natural surface waters was increased relative to that in ultrapure water not only for the smaller extent of photochemical transformation but more importantly the surface modification by water chemistry. Furthermore, the colloidal stability of MoS photoaged in natural surface waters followed the order of sea water > lake water > river water. The abundant cations (e.g., Ca and Mg) in sea water facilitated the covalent grafting (S-C bonds) of more dissolved organic matter (DOM) on MoS via charge screening and cation bridging, thus inducing stronger electrostatic repulsion and steric effect to stabilize nanosheets. The crucial role of the covalent grafting of DOM was further confirmed by the positive correlation between the critical coagulation concentration values and S-C ratios (R = 0.82, p < 0.05). Our results highlighted the dominant role of water chemistry than light irradiation in dictating the colloidal stability of MoS photoaged in natural surface waters, which provided new insight into the environmental behavior of MoS in aquatic environment.
PubMed: 38924950
DOI: 10.1016/j.watres.2024.121973 -
Nanomaterials (Basel, Switzerland) Jun 2024TiO-based mixed oxide-carbon composite support for Pt electrocatalysts provides higher stability and CO tolerance under the working conditions of polymer electrolyte...
Composites of Titanium-Molybdenum Mixed Oxides and Non-Traditional Carbon Materials: Innovative Supports for Platinum Electrocatalysts for Polymer Electrolyte Membrane Fuel Cells.
TiO-based mixed oxide-carbon composite support for Pt electrocatalysts provides higher stability and CO tolerance under the working conditions of polymer electrolyte membrane fuel cells compared to traditional carbon supports. Non-traditional carbon materials like graphene nanoplatelets and graphite oxide used as the carbonaceous component of the composite can contribute to its affordability and/or functionality. TiMoO-C composites involving these carbon materials were prepared through a sol-gel route; the effect of the extension of the procedure through a solvothermal treatment step was assessed. Both supports and supported Pt catalysts were characterized by physicochemical methods. Electrochemical behavior of the catalysts in terms of stability, activity, and CO tolerance was studied. Solvothermal treatment decreased the fracture of graphite oxide plates and enhanced the formation of a reduced graphene oxide-like structure, resulting in an electrically more conductive and more stable catalyst. In parallel, solvothermal treatment enhanced the growth of mixed oxide crystallites, decreasing the chance of formation of Pt-oxide-carbon triple junctions, resulting in somewhat less CO tolerance. The electrocatalyst containing graphene nanoplatelets, along with good stability, has the highest activity in oxygen reduction reaction compared to the other composite-supported catalysts.
PubMed: 38921928
DOI: 10.3390/nano14121053 -
Nanomaterials (Basel, Switzerland) Jun 2024Crystalline calcium fluoride (CaF) is drawing significant attention due to its great potential of being the gate dielectric of two-dimensional (2D) material MOSFETs. It...
Crystalline calcium fluoride (CaF) is drawing significant attention due to its great potential of being the gate dielectric of two-dimensional (2D) material MOSFETs. It is deemed to be superior to boron nitride and traditional silicon dioxide (SiO) because of its larger dielectric constant, wider band gap, and lower defect density. Nevertheless, the CaF-based MOSFETs fabricated in the experiment still present notable reliability issues, and the underlying reason remains unclear. Here, we studied the various intrinsic defects and adsorbates in CaF/molybdenum disulfide (MoS) and CaF/molybdenum disilicon tetranitride (MoSiN) interface systems to reveal the most active charge-trapping centers in CaF-based 2D material MOSFETs. An elaborate Table comparing the importance of different defects in both n-type and p-type devices is provided. Most impressively, the oxygen molecules (O) adsorbed at the interface or surface, which are inevitable in experiments, are as active as the intrinsic defects in channel materials, and they can even change the MoSiN to p-type spontaneously. These results mean that it is necessary to develop a high-vacuum packaging process, as well as prepare high-quality 2D materials for better device performance.
PubMed: 38921914
DOI: 10.3390/nano14121038 -
ACS Nano Jun 2024This study investigates the applicability of six transition metal dichalcogenides to efficient therapeutic drug monitoring of ten antiepileptic drugs using laser...
This study investigates the applicability of six transition metal dichalcogenides to efficient therapeutic drug monitoring of ten antiepileptic drugs using laser desorption/ionization-mass spectrometry. We found that molybdenum ditelluride and tungsten ditelluride are suitable for the sensitive quantification of therapeutic drugs. The contribution of tellurium to the enhanced efficiency of laser desorption ionization was validated through theoretical calculations utilizing an integrated model that incorporates transition-metal dichalcogenides and antiepileptic drugs. The results of our theoretical calculations suggest that the relatively low surface electron density for the tellurium-containing transition metal dichalcogenides induces stronger Coulombic interactions, which results in enhanced laser desorption and ionization efficiency. To demonstrate applicability, up to 120 patient samples were analyzed to determine drug concentrations, and the results were compared with those of immunoassay and liquid chromatography-tandem mass spectrometry. Agreements among these methods were statistically evaluated using the Passing-Bablok regression and Bland-Altman analysis. Furthermore, our method has been shown to be applicable to the simultaneous detection and multiplexed quantification of antiepileptic drugs.
PubMed: 38920103
DOI: 10.1021/acsnano.4c02429 -
Beilstein Journal of Nanotechnology 2024In this research paper, a vertical tunnel field-effect transistor (TFET) structure containing a live metal strip and a material with low dielectric constant is designed,...
In this research paper, a vertical tunnel field-effect transistor (TFET) structure containing a live metal strip and a material with low dielectric constant is designed, and its performance metrics are analyzed in detail. Low- SiO is incorporated in the channel-drain region. A live molybdenum metal strip with low work function is placed in a high- HfO layer in the source-channel region. The device is examined by the parameters , subthreshold swing, threshold voltage, and / ratio. The introduction of a live metal strip in the dielectric layer closer to the source-channel interface results in a minimum subthreshold slope and a good / ratio. The low- material at the drain reduces the gate-to-drain capacitance. Both the SiO layer and the live metal strip show excellent leakage current reduction to 1.4 × 10 A/μm. The design provides a subthreshold swing of 5 mV/decade, which is an excellent improvement in TFETs, an on-current of 1.00 × 10 A/μm, an / ratio of 7.14 × 10, and a threshold voltage of 0.28 V.
PubMed: 38919167
DOI: 10.3762/bjnano.15.59 -
Environmental Research Jun 2024Soil deterioration is a major cause of poor agricultural productivity, necessitating sufficient nutrient inputs like fertilizers and amendments for sustainable use. As...
Enhancement of root abscisic acid mediated osmotic regulation by macroalgal compounds promotes adaptability of Rice (Oryza sativa L.) in response to progressive metal ion mediated environmental stress.
Soil deterioration is a major cause of poor agricultural productivity, necessitating sufficient nutrient inputs like fertilizers and amendments for sustainable use. As one such strategy, the current study evaluates the potential of Sargassum wightii, a brown seaweed extract, as an osmopriming agent to improve seed germination, early establishment, and competent seedling performances in acidic soil. The elemental makeup of seaweed extract (BS) showed that it included major plant macro (Potassium, Nitrogen and Phosphorous), as well as micronutrients (Magnesium and Iron) and trace elements (Zinc, Copper, and Molybdenum). While seed germination was impacted by H ion toxicity, seeds primed with BS emerged earlier and showed a higher germination percentage (98.2%) and energy (92.4%). BS treatments enhanced seedling growth by 63% and had a positive effect on root growth (68.2%) as well as increases in root surface area (10%) and volume (67.01%). Stressed seedlings had 76.39% and 63.2% less carotenoid and chlorophyll, respectively. In seedlings treated with BS, an increase in protein and Total Soluble Sugars content of 14.56 and 7.19%, respectively, was seen. Fourier Transform-Infra Red analysis of postharvest soil indicated improved soil health with absorbance corresponding to enhanced soil water holding capacity and organic matter. Increased abscisic acid synthesis rate and associated antioxidant enzyme system (Malondialdehyde, Glutathione peroxidases and ascorbate peroxidase) activation, along with enhanced H adenosine triphosphate-ase and glutathione activities, help ameliorate and deport H ions from cells, scavenge Reactive Oxygen Species, thus protecting cells from injury. Seaweed extract successfully reduced H-induced ion toxicities in rice by promoting their germination, physiological, metabolically, and growth parameters that could ultimately increase their productivity and yield in a sustainable and environmentally friendly manner.
PubMed: 38917933
DOI: 10.1016/j.envres.2024.119485 -
Applied Radiation and Isotopes :... Jun 2024The preparation of nanometer-thick molybdenum-99 (Mo) sources using the droplet deposition method was investigated. The quality of these prepared sources was analyzed...
The preparation of nanometer-thick molybdenum-99 (Mo) sources using the droplet deposition method was investigated. The quality of these prepared sources was analyzed using scanning electron microscopy (SEM), electron Rutherford backscattering (ERBS) techniques, and Geant4 simulations. The emitted electrons resulting from the β-decay of the prepared Mo sources, with energies below 2.2 keV, were measured and compared with existing literature data as well as the results obtained from our in-house Monte-Carlo model, BrIccEmis.
PubMed: 38917620
DOI: 10.1016/j.apradiso.2024.111405 -
ACS Applied Materials & Interfaces Jun 2024Metal halide perovskite materials with excellent carrier transport properties have been regarded as a new class of catalysts with great application potential. However,...
Metal halide perovskite materials with excellent carrier transport properties have been regarded as a new class of catalysts with great application potential. However, their development is hampered by their instability in polar solvents and high temperatures. Herein, we report a solution-processed CsMoCl perovskite nanocrystals (NCs) capped with the Mo, showing high thermostability in polar solvents. Furthermore, the Pd single atoms (PdSA) can be anchored on the surface of CsMoCl NCs through the unique coordination structure of Pd-Cl sites, which exhibit excellent semihydrogenation of different alkyne derivatives with high selectivity at full conversion at room temperature. Moreover, the activity could be improved greatly under Xe lamp irradiation. Detailed experimental characterization and DFT calculations indicate the improved activity under light illumination is due to the synergistic effect of photo-to-heat conversion and photoinduced electron transfer from CsMoCl to PdSA, which facilitates the activation of the C≡C group. This work not only provides a new catalyst for high selective semihydrogenation of alkyne derivatives but also opens a new avenue for metal halides as photothermal catalysts.
PubMed: 38917413
DOI: 10.1021/acsami.4c05157