ChemNanoMat最新文献

Herein, we report the design, synthesis, and properties of two donor-π-acceptor (D-π-A) charge transfer fluorophores pursuing an efficient deep blue emitter for organic light-emitting diode (OLED). TCyCN and TPhCN comprise triphenylamine as a donor and benzonitrile as an acceptor connecting by either [2.2]paracyclophane (Cy) as a through-space π-linker or phenyl ring (Ph) as a through-bond π-linker, respectively. In thin film, TCyCN shows deep blue emission with moderate fluorescence efficiency, while TPhCN displays cyan blue emission with a high fluorescence efficiency. The two molecules feature hybridized local and charge-transfer states with good thermal stability and balanced charge transport properties. They are successfully employed as non-doped blue emissive layers in OLEDs. The TCyCN-based device emits deep blue light peaked at 425 nm (CIE coordinates of (0.157, 0.076)) with a moderate electroluminescent (EL) performance (EQE_max=3.23 % and CE_max=2.06 cd A⁻¹), while the TPhCN-based device attains an excellent EL performance (EQE_max=6.24 % and CE_max=8.26 cd A⁻¹) with cyan blue emission peaked at 490 nm. This work provides insight into the relationship between molecular design and properties of D-π-A emitters, offering a guideline for tailoring new organic compounds for organic optoelectronics.

In photoelectrochemical (PEC) water splitting, semiconductor-based photoelectrodes can improve reaction rates and durability by incorporating cocatalysts that serve as active sites for the water splitting process. However, achieving both high light transmittance and efficient catalytic activity is essential for these cocatalysts. This study aimed to optimize the surface loading of semitransparent NiFeO_x thin-film electrocatalysts to enhance the oxygen evolution reaction (OER) rates while maintaining high light transmittance. NiFeO_x thin films were deposited on fluorine-doped SnO₂ (FTO) transparent conductive substrates, and the relationship between the NiFeO_x loading amount (Γ) and the OER rate was examined using electrochemical techniques. The OER rate of NiFeO_x on FTO (NiFeO_x/FTO) was the highest at a Γ value of 0.20 μmol cm⁻². To further explore the connection between this optimized Γ and PEC activity, the impact of Γ on the PEC OER performance of visible-light-absorbing α-Fe₂O₃ semitransparent photoanodes was evaluated as a model system. Applying the optimized Γ of NiFeO_x to modify the α-Fe₂O₃ surface also led to enhanced PEC OER performance. These findings highlight the critical role of surface design, specifically the optimization of cocatalyst loading and electrocatalytic activity, in improving PEC water splitting efficiency, providing valuable guidelines for future semitransparent photoelectrode development.

Chiral enantiomers, while typically exhibiting similar physical and chemical properties, often have distinct therapeutic effects. The preparation of pure enantiomers is therefore of significant interest in the food, chemical, and pharmaceutical industries, making the separation of enantiomers highly sought after. Membrane separation technology has garnered widespread attention for its environmental friendliness and scalability. Recently, chiral two-dimensional (2D) membranes have demonstrated superior separation performance due to their ultrathin nature and orderly transmission channels. Macrocyclic chiral 2D membranes, in particular, combine the inherent cavity structure of macrocyclic molecules with the host-guest interaction capabilities that specifically recognize chiral molecules. Additionally, they benefit from the excellent chemical stability and adjustable interlayer spacing of 2D materials. This combination allows these membranes to achieve high enantioselectivity while improving flux. By optimizing the trade-off between flux and enantioselectivity, this strategy offers a promising new approach for developing advanced chiral membranes.

The cost-effective synthesis of supercapacitors is a significant challenge in energy storage research. This study introduces a sustainable and cost-effective method for synthesizing biomass-derived carbon for solid-state supercapacitor fabrication. Turmeric (Curcuma longa) plant waste is carbonized at three distinct temperatures (500, 600, and 700 °C for 3 hours), and the resulting carbon is characterized to determine the optimal carbonization conditions. Physicochemical characterization revealed the presence of multiple heteroatoms, which may contribute to enhanced capacitance. Electrochemical studies showed that the carbonized material at 600 °C achieved the highest specific capacitance of 110.04 F/g at 0.1 A/g current density. After activation, the specific capacitance increased to 188 F/g at 0.1 A/g current density. A solid-state supercapacitor was assembled using the synthesized activated carbon and PVA/H₂SO₄ gel-type electrolyte. The resulting device exhibited an impressive specific capacitance of 92.33 F/g at 0.1 A/g, a power density of 4295.28 W/kg, and a cycling stability of 97.42 %. This supercapacitor shows promising potential as an economical and sustainable energy storage solution for portable electronics.

The cover image shows the first well-characterized single source precursor for the solution-phase synthesis of two-dimensional MoSe₂ materials. This work illustrates the importance of thoughtful selection of appropriate metal reagents and ligand sets, careful control of the reaction conditions as well as deeper knowledge of their reactivity and decomposition mechanism for the scale-up production of high-quality nanomaterials under moderate processing conditions for advanced applications. More information can be found in the Research Article by Shashank Mishra and co-workers. Image created with BioRender.com.

The wastewater of Chlortetracycline (CTC) poses a threat to the balance of aquatic ecosystems, promoting the formation and dissemination of antibiotic-resistant bacterial strains in the aquatic environment. Moreover, such pollution can directly or indirectly affect human health through water sources, exacerbating the issue of antibiotic resistance. In response to this pollution challenge, Amino-modified salix wood powder membrane(ASPPM) was prepared by phase transition and wet spinning techniques, aimed at removing CTC from water bodies. Adsorption experiment results show that the ASPPM maximum adsorption capacity for CTC is 459 mg/g. In the desorption process, the highest desorption rate of ASPPM for CTC was 79.65 %. By fitting pseudo-first-order and pseudo-second-order kinetic models, it is found that the adsorption process of ASPPM on CTC is predominantly chemical adsorption. By fitting three isotherm models, it is found that the adsorption behavior of ASPPM on CTC is more in accordance with the Freundlich isotherm model, indicating multilayer adsorption on heterogeneous surfaces. Thermodynamic analysis indicates that the adsorption process of ASPPM on CTC is spontaneous, exothermic and accompanied by an increase in entropy at different temperatures. Furthermore, ASPPM has a highly porous structure. During its preparation, the characteristic absorption peaks of −CONH and −NH₂ in ASPP are preserved and the cellulose type I in ASPPM is transformed into type II, resulting in a more orderly crystal structure. The preparation of ASPPM study not only transforms renewable biomass materials into effective tools for environmental purification but also offers a cost-effective new approach for sustainable environmental management, expanding the application of biomass materials in the field of environmental protection.

In this research, new nano buds of C60 fullerene compound and nanobowls were designed and their structure, electrical properties and optical properties were calculated. The absence of imaginary frequency and high cohesive energies is proof of stability and confirmation of the possibility of their formation. Calculation of the relative population showed that the E configuration is the dominant population. The calculation of electrical properties showed that combining the structures with each other improves the electrical properties of nanobuds. The highest electric charge transfer from nanobowl to C60 was observed in the configuration of C nanobuds. A high improvement in NLO properties was observed in all nanobud configurations. Calculating the contribution of the dispersion term in the energy of the nanobuds showed that compared to the parents, larger dispersion energy was obtained for the designed nanobuds (especially configuration E). It was shown that the energy of nano buds and their parents decreases in the presence of solvents. The decrease in energy as a function of increasing the dielectric constant of the solvents may be due to the increase in the dipole moments of the nanobud as a result of the electron transfer from the nanobowl to the C60 fullerene.

The development of efficient catalysts for high-performance ammonia oxidation reaction (AOR) is crucial for direct ammonia fuel cells. However, AOR is severely affected by slow kinetics and the toxicity of reaction intermediates, which reduce the durability of precious metal catalysts. Here, a two-dimensional carbon dots modified Pt₂Pd nanoporous alloy (Pt₂Pd-CDs) is synthesized through the borane morpholine reduction of a platinum palladium oxide nanosheet. The Pt₂Pd_3 % CDs (the mass of CDs is 3 % of Pt₂Pd) exhibits high AOR activity and stability in alkaline media, with an onset potential of 0.41 V vs. RHE, which is 170 mV lower than that of the commercial Pt/C (0.58 V vs. RHE). In addition, after 2000 cycles of accelerated durability testing, the peak mass activity (115.3 A g_PGM⁻¹) decreases by only 25.8 %. This enhancement is mainly attributed to the unique advantage of two-dimensional nanoporous structure with a high electrochemical surface area, and the strong ammonia adsorption and the electron deliver capacity of CDs.

The increasing levels of ammonium in wastewater pose serious environmental issues, highlighting the urgent need for effective adsorbents to facilitate its removal. Although conventional biological treatment methods have certain drawbacks, adsorption using carbonaceous materials, such as carbon black produced from waste tires, presents a promising alternative for ammonium removal. However, the use of these materials has not been thoroughly investigated. This study focuses on optimizing the synthesis of carbon black modified with anionic surfactants to improve its capacity for ammonium adsorption. Utilizing Response Surface Methodology (RSM) and a Box-Behnken design, the optimization process examined key variables, including reaction time, surfactant concentration, carbon black dosage, and surfactant type. Comprehensive characterization of the adsorbent was conducted to analyze its surface properties, functional groups, morphology, and elemental composition. The regression models produced highly accurate results with an R² value of 0.9437. The optimal synthesis conditions were identified as a 12.30-hour reaction time, a surfactant concentration of 8 mmol/L of sodium dodecylbenzene sulfonate, and a carbon black dosage of 30 g, achieving an ammonium removal efficiency of 84.80 %. This study offers a scalable solution for ammonium removal in wastewater, promising practical applications and future sustainable waste management research.

Supported Pd catalysts have been widely studied due to their enormous potential as candidates for heterogeneous Suzuki–Miyaura coupling reactions. However, the sintering and low activity of active sites still remain challenges. A vesicle-shaped LaFeO₃-supported Pd catalyst (I−Pd/LaFeO₃) was successfully fabricated using the impregnation method and tested for the Suzuki–Miyaura coupling reaction. Compared to P−Pd/LaFeO₃ prepared with photo-deposition and Pd/Al₂O₃ prepared with impregnation, the I−Pd/LaFeO₃ catalyst exhibits significantly higher catalytic activity, stability, and reusability. The chemical composition and electron states of different Pd-based catalysts were well studied based on various characterizations and the results indicated that the excellent performance of I−Pd/LaFeO₃ can be attributed to its unique nanostructure and the strong interactions between LaFeO₃ and palladium nanoparticles. The impregnation method and the choice of the LaFeO₃ support show a great influence on the electronic properties of Pd species, their reducibility, and, consequently, their reaction behavior. This unique LaFeO₃ supported Pd catalyst provided an environmentally friendly heterogeneous method for the Suzuki–Miyaura coupling reaction.