Nature Protocols
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2025
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IF 16
Zhang Fenghua,Shi Wenxiong,Liu Qingda,Wang Xun
Atomic-level manufacturing enables the bottom-up fabrication of nanomaterials with tailored structures and properties. Clusters with atomic precise structures can be used as superatom building blocks to construct superstructures with exceptional properties beyond their individual properties. However, the programmable and large-scale synthesis of cluster assemblies remains challenging. This protocol describes the detailed experimental procedures for the modular assembly of polyoxometalate (POM) clusters into subnanomaterials by programmable interactions under simple and mild conditions. In this approach different types of POM clusters (0.7–1.8 nm in size) are coated with quaternary ammonium or oleylamine ligands using either two-phase or solvothermal methods. The assembly process depends on the interactions between atom clusters, ligands and the reaction matrix, all of which can be modified to generate a library of subnanometer superstructures. The four intercluster connection modes are metal cation-induced coordinative connection, anion bridged covalent connection, synergistic noncovalent interaction and cluster–nucleus co-assembly. A library that includes single-cluster nanowires, clusterphenes and nanosheets with single-cluster thicknesses, can be prepared within 3–12 h. Owing to their ultrahigh surface atom ratio and electron delocalization, the resulting subnanometer POM assemblies with rich structural and compositional diversity exhibit excellent properties and application potential in terms of mechanics, catalysis and chirality. This procedure is suitable for users with prior expertise in the synthesis of inorganic and cluster-based nanomaterials.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Yanfeng Chen,Meng Nan,Yanxing He,Shuang Lu,Wei Shen,Gang Cheng,Shufen Chen,Wei Huang
During the synthesis of deep-blue perovskite quantum dots (PQDs), they generally emerge as a two-dimensional byproduct with poor yield and low photoluminescence quantum yield (PLQY) due to amine ligand enrichment-induced abundant surface defects. Herein, we provide a colloidal synthesis method to prepare deep-blue CsPbBr3 PQDs in a green nontoxic solvent via strategic Z-type ligand engineering. Z-type ligands of zinc octanoate enable the formation of robust coordination bonds with surface bromide ions of PQDs, maintaining acid–base equilibrium and reducing excess amine enrichment on the PQDs surface. Consequently, homogeneous and monodispersed PQDs with improved PLQY of 73% are successfully synthesized, achieving efficient deep-blue LEDs with a peak EQE of 5.46%, a maximum luminance of 847.6 cd/m2, and an operational half-lifetime of 14 min. The devices exhibit color coordinates of (0.137, 0.049), closely approximating the Rec. 2020 blue standard. Our work offers a potentially eco-friendly and viable route for realizing high-performance LEDs in the deep-blue region.
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ACS Photonics
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2024
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IF 6.5
Qinglin Zeng,Jibin Zhang,Xinzhen Ji,Meng Wang,Shuailing Lin,Meng Su,Qianli Liu,Linyuan Lian,Mochen Jia,Xu Chen,Zhuangzhuang Ma,Ying Liu,Yanbing Han,Yongtao Tian,Xin-Jian Li,Zhifeng Shi
The polar solvent of water can disrupt the structure of lead halide perovskite nanocrystals (PeNCs), and its presence is inevitable during the synthesis process. Therefore, it is crucial to understand the impact of synthetic atmospheric humidity on the performance of PeNCs and their electroluminescence. In this study, we first synthesized formamidine lead bromide (FAPbBr3) PeNCs at different relative air humidities and explored their optoelectronic properties and electroluminescence. We found that under optimal humidity conditions (40% R.H.), water molecules can reduce the nucleation growth barrier of PeNCs through ligand replacement. This process results in nanocrystals with good crystallinity and fewer defects, thereby reducing defect states and nonradiative recombination. The perovskite light-emitting diodes (PeLEDs) based on these FAPbBr3 PeNCs exhibit a maximum luminance of 39,000 cd m–2 and a peak external quantum efficiency of 16.2%, surpassing most reported values in the literature without the use of any additional additives. This study elucidates the role of atmospheric humidity in the growth of PeNCs and introduces the concept of humidity-assisted synthesis, which is crucial for scaling up production in the industry.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Kaiyue Liu,Qiyan Wen,Qichang Zhou,Shuntian Huang,Xinyu Zhao,Shujuan Yang,Furui He,Yuhong Feng,Gaobo yu,Jun Dai,Jiacheng Li
Polysaccharide-based soft particles have wide applications in preparing high phase Pickering emulsions (HIPPEs) because of their adjustable interfacial properties , which can advance the stability of HIPPEs by strengthening their interfacial viscoelasticity . Nevertheless, there is limited research on the interfacial viscoelasticity of soft particles regarding the stability of HIPPEs. We synthesized Alg-CA soft particles by the Ugi reaction, featuring catechol functionality and amphiphilic alginate. These particles can self-assemble under pH stimulation, resulting in a network structure that impacts the interfacial viscoelasticity of HIPPEs. We investigated the relationship between self-assembled microstructure and interfacial viscoelasticity using transmission electron microscopy (TEM) and rheometry. The study indicates that the Alg-CA solution produced a compact network structure at a pH level of 3, leading to the formation of highly stable HIPPEs (with a viscosity of approximately 1000 Pa·s). Additionally, by utilizing emulsion templates, 3D network aerogels with pH-sensitive, consistent microstructures may be developed, which presents a promising approach for designing and producing aerogels with distinct microporous architectures.
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JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Yongfu Liang,Yuping Yang,Junbo Wang,Xuerui Cheng,Chaosheng Yuan,Xiang Zhu,Shiquan Feng,Zheng Wang,Haining Li,Huanjun Zhang
The structural versatility of organic compounds imparts manifold properties to hybrid organic−inorganic perovskites, where two-dimensional (2D) halide perovskites are potential future platforms for light-emitting devices because of their unique quantum well configuration and dielectric confinement. Notwithstanding the numerous studies on the organic−inorganic perovskites carried out to date, precisely charactering the structure and photoluminescence mechanism remain considerable challenges. Herein, by applying Rietveld refinement, we have obtained crystal structure and atomic sites of 2D layered OA 2 PbBr 4 perovskite , which undergoes a phase transition at 190 K with activation energies of 29.6 and 3.8 meV for the two phases, respectively. The theoretical analysis based on the crystal structure were performed to understand the nature of vibrations and band structure. Steady-state PL shows a narrow emission and a broad emission located at 409 and 487 nm, respectively. With temperature cooling down to 118 K, narrow emission gradually narrowed and enhanced. Meanwhile, intensity of broad emission first weakens and then increases. The turning point occurs near 198 K. By applying time-resolved PL (TRPL) and transient absorption (TA) spectra experiment, we observed a rapid carrier transfer from the FE to the STE state, and demonstrated the narrow and broad bands originate from free exciton and self-trapped exciton emission, respectively. And the self-trapping depth is proved to be 26.3 meV by low-temperature PL. Our findings indicate the synthesized 2D perovskite has potential applications in optoelectronic and display devices.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Wenxu Hu,Yang Yu,Zhehui Weng,Yao Huang,Yanni Li,Dandan Ge
In this study, a new vortex-assisted dispersive liquid–liquid microextraction technique based on supramolecular solvent (SUPRAS) was proposed for the simultaneous extraction and preconcentration of aristolochic acids (AAs) in Aristolochia debilis followed by HPLC-DAD. A new type of SUPRAS, based on hexafluoroisopropanol (HFIP) and primary amine, with a higher density than water was prepared for the first time. HFIP acted as the coacervation agent and density modifier for the preparation of SUPRAS, and only a small amount of HFIP was required to form the SUPRAS. The influencing parameters such as the type and content of primary amine, the content of HFIP, vortex time, solution pH and ionic strength were thoroughly investigated and optimized. The prepared SUPRAS can effectively exclude macromolecules such as starch and be used to extract AAs from herbal medicines with high extraction efficiency. Under the optimized conditions, the method provided satisfactory linearity (1 ∼ 1000 ng mL −1 for AAb and 10 ∼ 1000 ng mL −1 for AAa with determination coefficients higher than 0.9981), low limits of detection (0.3 ∼ 3.1 ng mL −1 ) and limits of quantification (1.0 ∼ 9.5 ng mL −1 ). In addition, the intra-day and inter-day precision with relative standard deviations (RSDs%) below 6.8 % were obtained. Finally, the proposed method was applied to determine the AAs in Aristolochia debilis , the extraction recoveries were between 92.8 %∼100.6 % with RSDs% between 0.5 % and 7.2 %. Therefore, the developed method was an easy, efficient and reliable method for determining AAs in Aristolochia herbal materials.
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FOOD HYDROCOLLOIDS
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2025
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IF 12.4
Binglei Song,Peili Wang,Xiaomei Pei,Linyu Xue,Yushi Sun,Zhao Chen,Zhenggang Cui
High internal phase emulsions (HIPEs) possess unique semi-solid characteristics and find extensive applications in food, medicine, and other fields. HIPEs stabilized by cellulose nanocrystals (CNC) not only show high safety and good stability, but also has good biocompatibility and biodegradability. However, Large amounts of CNCs are usually necessary to stabilize the HIPEs due to the rather strong hydrophilicity of the CNC surface. Herein, amine compounds were utilized to modify the CNC surface instead of commonly used ionic surfactants. The results indicate that hydrogen bonding serves as the main molecular interactions between amine molecules and the CNC surface. A combination of 0.1wt% CNC and 0.1 mM aliphatic primary amine could stabilize Pickering emulsions with an oil-water ratio of 1:1 (v/v). The usage of CNC is about 20-fold lower than that of emulsions without amines. When combined with 1 mM aliphatic primary amine, stable HIPEs with an oil-water ratio of 8:2 (v/v) were formed, with a stability exceeding 6 months. All the HIPEs stabilized by CNC and amine compounds exhibit a solid-like structure dominated by elasticity. With the synergistic effect of CNC and amine compounds, the commercially available olive oil, soybean oil, and canola oil can all form stable emulsions. In addition, porous materials were successfully prepared by freeze-drying the prepared high internal phase emulsions. The present work reveals that HIPEs can be well stabilized by CNCs and amines at very low concentrations through hydrogen bonds. The results are also inspirable to develop eco-friendly HIPEs in cosmetics and food science.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Mingxin Cai,Qinghua Ye,Ziru Wang,Peilei He
Electrochemical water splitting for hydrogen production is currently constrained by the sluggish kinetics of the anodic oxygen evolution reaction (OER). NiFe-based catalysts have emerged as promising alternatives to precious metal OER catalysts due to their low cost and relatively high electrocatalytic activity. However, NiFe-based catalysts prepared by conventional synthesis methods suffer from a low density of exposed active sites and ambiguous structures. Herein, we report a straightforward solution-thermal strategy for constructing two-dimensional sub-1 nm nanosheets (SNSs) through the self-assembly of an iron-substituted polyoxometalate (FeMo 6 ) cluster with Ni 3 S 2 . The Ni 3 S 2 –FeMo 6 SNSs exhibit excellent electrocatalytic performance in 1 M KOH, achieving an overpotential of only 342 mV at a current density of 100 mA cm −2 and maintaining stability for 100 h at 10 mA cm −2 . The synergistic effect between Fe and Ni 3 S 2 effectively modulates the electronic structure of the catalyst, accelerating the formation of the active NiOOH phase. Furthermore, Fe incorporation actively enhances hydroxyl groups adsorption on the catalyst surface and facilitates lattice oxygen participation in the reaction. This work clarifies the role of Fe in NiFe-based electrocatalysts, providing new perspectives for developing facile-to-synthesize and high-performance electrocatalysts.
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Journal of Oleo Science
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2025
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IF 1.8
Guangqun Cao,Guofang Gao,Penghui Liang,Junxia Wang,Yilei Ruan,Zhiyong Hu,Hailin Zhu
Surface activity parameters such as critical micelle concentration (CMC), saturation adsorption (Гmax), and limiting molecular area (Amin) of three triazinyl bisquaternary ammonium salts with different hydrophobic chain lengths (C6-2-C6, C8-2-C8 and C12-2-C12) were analyzed from surface tension tests. The results showed that the CMC value of C12-2-C12 was much lower (0.026 mmol/L) than that of C6-2-C6 and C8-2-C8. The corrosion inhibition performances of three triazinyl bisquaternary ammonium salts on Q235 in 1 mol/L HCl solution were investigated by weight loss measurements and electrochemistry measurements. The results showed that the longer the hydrophobic chain length, the better the corrosion inhibition performance at the same concentration. The corrosion inhibition efficiencies of C12-2-C12, C8-2-C8 and C6-2-C6 at 0.2 mmol/L were 98.10%, 96.09% and 94.64%, respectively. Surface analysis and quantum chemical calculations showed that the three triazinyl bisquaternary ammonium salts can be adsorbed on the surface of carbon steel effectively to inhibit the corrosion of the carbon steel surface.
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JOURNAL OF LUMINESCENCE
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2025
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IF 3.6
Naqing Wang,Qixin Huang,Zhehong Zhou,Shaojun Wang,Tao Pang,Lingwei Zeng,Daqin Chen
Synthesis of lanthanide-doped perovskite nanocrystals generally utilizes long-chain ligands like oleylamine and oleic acid at high temperatures up to 260 °C. To tackle this issue, we develop a strategy (temperatures down to 170 °C) to fabricate ytterbium (Yb 3+ )-doped CsPbCl 3 perovskite nanocrystals using the octylamine ligand benefited from its low boiling point and short carbon chain. The as-prepared Yb 3+ -doped CsPbCl 3 perovskite nanocrystals can yield both violet luminescence assigned to exciton recombination and near-infrared emission ascribed to Yb 3+ : 2 F 5/2 → 2 F 7/2 . Structural and spectroscopic characterizations evidence that energy transfer from CsPbCl 3 to Yb 3+ and from defect states to Yb 3+ are simultaneously responsible for the observed Yb 3+ luminescence with quantum yield of 49.5 %. Femtosecond transient absorption spectra confirm that the transferring time scale is within 100 ps, which is much faster than the photoluminescent decay lifetimes of 3000 ps, enabling efficient CsPbCl 3 -to-Yb 3+ energy transfer and thus Yb 3+ luminescence.
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Journal of Materials Chemistry C
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2025
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IF 5.1
Chao Gao,Ziheng Song,Huijie Chen,Ling Wu,Zhibing Weng,Lei Jiang,Qingru Wang,Yingdong Han
Surface-enhanced Raman spectroscopy (SERS) is a powerful fingerprint spectroscopic technique capable of detecting trace molecules, which finds extensive application potential in diverse fields. The SERS substrates with excellent Raman signal enhancement, scalability in large-scale fabrication, and long-term stability is of significant scientific interest and practical value. Herein, we report a hybrid SERS substrate, namely tip-Si@MoSxOy, which integrates a periodic tip-patterned Si metasurface with MoSxOy semiconductor nanostructures, to develop novel noble-metal-free SERS substrate with sensitive molecule detection performance. The engineered periodic Si metasurface enables broadband matrix resonance by coupling with incident light, significanlty amplifying the localized near-field intensity at the inter-element nanogap regions. Theoretical calculations show that the maximum E-field enhancement can be up to 511 times. Meanwhile, the MoSxOy semiconductor leads to modification of the the polarization of probe molecules due to the charge-transfer interactions enabling chemical mechanism SERS effect. These combined effects make the detection of rhodamine 6G (R6G) at concentrations as low as 10-9 M and enhancement factor as high as 107. Moreover, the hybrid substrate exhibits superior antioxidation properties, eliminating the requirement of inert storage environments necessary for traditional noble-metal-based SERS substrates. Also, the MoSxOy semiconductor nanosructures are covalently bonded to the metasurface, ensuring structural stability without the need for post-transfer processes. Therefore, our work provides a novel approach to develop hybrid substrates with improved SERS performance, which is readily achievable and is expected to attract more research enthusiasm in the future.
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ACS Applied Optical Materials
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2025
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IF 3.8
Xi Ran,Hang Xia,Jing Liu,Mohan Yuan,Xudong Hu,Ya Wang,Xinzheng Lan
Lead sulfide (PbS) colloidal quantum dot (CQD) photodetectors are promising devices for low-cost, high-performance, and large-area infrared imaging. For integration with readout integrated circuits (ROICs), top illumination is urgently required to ensure simultaneous light absorption and signal acquisition. However, the traditional best-performing p-on-n PbS CQD photodetectors rely on opaque top metal contacts, thus limiting the development of top-illuminated imagers. Herein, we addressed this issue by introducing a bifunctional ZnTe layer. The presence of the ZnTe layer─while allowing efficient hole collection─serves as a protective layer for the CQD layer during subsequent transparent electrode deposition. The resultant PbS CQD photodetectors based on the ZnTe layer show a specific detectivity of 2.09 × 1012 Jones at ≈1300 nm, representing approximately a 5-fold improvement over the control device (4.30 × 1011 Jones). This performance is comparable to that of the best PbS CQD photodetectors reported at similar wavelengths. The advantages of this architecture are further demonstrated by building a PbS CQD imager with a pixel array of 256 × 256, verifying the compatibility of photodetectors with ROICs.
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