RSC Advances
·
2017
·Vol. 7
·期 31
·19205-19210
·
IF 3.108
Jing Yan,Honghu Yao,Junhao Li,Shiman He,Qili Wu,Xianfeng Yang,Wasim Ullah Khan,Jianxin Shi,Mingmei Wu
To meet the increasing requirement, much effort has been devoted to enhance the emission intensity and tailor the emission color of rare earth phosphors. However, limited contributions have been made to the up-conversion (UC) of nanorods by complete epitaxial growth on each facet to achieve this requirement. In this study, we propose a facile epitaxial growth route to grow anisotropic hexagonal β-NaYF4:Yb3+/Ho3+@β-NaYbF4:Er3+, β-NaYF4:Yb3+/Ho3+@β-NaYF4, and β-NaYbF4:Er3+@β-NaYF4 core/shell nanorods, which were realized by adding hexagonal β-NaYF4:Yb3+/Ho3+ or β-NaYbF4:Er3+ nanorods as a core-nanostructure into a solution containing cubic α-NaYbF4:Er3+ or α-NaYF4 nanoparticles as the shell-precursor. During epitaxial growth-induced phase transformation, the precursor nanoparticles disappeared gradually in the solution and consequently corresponding β-phased shell yielded on each outer facet of each β-phased nanorod core. Eventually, the nanorod core was covered completely with a uniformly grown β-NaYbF4:Er3+ or β-NaYF4 shell. The UC emission of either β-NaYF4:Yb3+/Ho3+ or β-NaYbF4:Er3+ core can be enhanced by the outer shell due to the decrease in the number of surface defects. In addition, tailored UC emissions could be obtained by controlling the shell components and thickness, typically in the core/shell nanorods of β-NaYF4:Yb3+/Ho3+@β-NaYbF4:Er3+. The tunable colors with improved emission in these core/shell nanorods may find wider applications in multicolor labeling and anti-counterfeiting.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2016
·
IF 2.822
Ting Song,Xilin Guo,Xuemei Li,Shusheng Zhang
A label-free electrochemical biosensor for ultrasensitive let-7d RNA detection was developed based on nicking endonuclease (NEase) assisted template enhanced hybridization process (TEHP) and rolling circle amplification (RCA) induced formation of G-quadruplex–hemin complexes. The hairpin probe (H1) was immobilized on the gold electrode through a strong Au S bond. With the help of assistant DNA , the introduction of target let-7d RNA forms the nicking site for the NEase, which cleaves the hairpin probe and releases the target RNA. Further addition of another hairpin probe (H2) initiated the next two cascaded recycling process. The cleaved fragment acted as primer to activate RCA reaction, generating product containing hundreds of hemin aptamer and G-quadruplex–hemin complex can be formed with the help of K + and hemin to give an electrochemical response. The newly designed protocol provides an ultrasensitive electrochemical detection of let-7d RNA down to the 0.42 fM level, and can discriminate target RNA from the let-7 family, holding a great potential for early diagnosis in gene-related diseases.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
·
IF 3.014
Guang-Xin Xiang,Guo-Jun Wang,Zhi-Jun Zhang,He Feng,Jing-Tai Zhao,Jiao Wang,Xin-Yuan Sun,Ri-Hua Mao,Yong Wang
The uniform 1D nano-rods of RE 3+ doped Ln 7 O 6 F 9 ( Ln = Y and Lu; RE = Pr, Sm and Eu) were synthesized through a facile two-step hydrothermal method without extra fluorine source followed by post-heat treatment. The phase formation, morphologies, as well as photoluminescence properties of the materials were investigated. The precursor composition was determined to be Ln (OH) 1.69 F 1.31 using the Fourier transform infrared spectrum (FT-IR), thermal gravimetric and differential scanning calorimetry (TG-DSC). The average lengths of Y 7 O 6 F 9 and Lu 7 O 6 F 9 were about 6.8 and 7.9 μm, respectively, with the average width of about 650 nm. It was interesting that the tip of the nano-rods exhibits a straight line and divergent umbrella shaped bifurcation for Y 7 O 6 F 9 and Lu 7 O 6 F 9 , respectively. Upon ultraviolet excitation, Pr 3+ , Sm 3+ and Eu 3+ ions in Ln 7 O 6 F 9 showed blue, orange and red emissions originating from their characteristic f-f transitions. In addition, the 4 f 1 5 d 1 → 4 f 2 band emissions (340–450 nm) as well as typical 4 f 2 → 4 f 2 line emissions (450–700 nm) of Pr 3+ were observed in Pr 3+ -doped Ln 7 O 6 F 9 . For Sm 3+ -doped Ln 7 O 6 F 9 , only the typical f - f transitions of Sm 3+ were observed with the absence of charge transfer (CT) band. However, the broad excitation bands at 255 nm attributing to the charge transfer transition of Eu 3+ (i.e. O 2− → Eu 3+ CT) were observed in Eu 3+ -doped Ln 7 O 6 F 9 .
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ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Xia Hao,Jing Lei Lei,Nian Bing Li,Hong Qun Luo
A simple and effective method for the detection of electrochemically inactive sodium dodecyl sulfate (SDS) has been designed, based on different binding affinity of polyethyleneimine (PEI) toward electrochemically active eosin Y and electrochemically inactive SDS. The stronger binding affinity of the PEI toward SDS than eosin Y results in the decrease of the redox peak current of surface confined eosin Y and provides a quantitative readout for the SDS. The difference in value of the cathodic peak current showed a linear relationship with SDS concentration in a concentration range from 1 to 40 μg mL −1 , and a detection limit of 0.9 μg mL −1 for SDS was obtained. Furthermore, the method has been successfully applied to the detection of SDS in real samples. The developed approach provided a simple and reliable detection for SDS and might have potential applications in electrochemical methods for inactive molecules.
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Symmetry-Basel
·
2025
·Vol. 17
·期 2
·224
·
IF 2.2
Yaohui Xu,Yong Li,Liangjuan Gao,Zhao Ding
CeO2has a potential application in the purification of organic dye wastewater because of the abundant oxygen vacancy (VO) defects in its crystals. In this study, a cubic CeO2microsphere with layered interleaved symmetrical 3D flower-like morphology was synthesized, and its adsorption capacity for acid orange 7 (AO7) was further enhanced by Y doping. The impact of varying amounts of Y ions on the phase composition, lattice parameters, and morphology of the product was investigated, revealing that 4 mol.% was determined as the doping level limit of Y ions in CeO2crystals. XPS, Raman, and H2−TPR techniques were employed to compare surface species changes before and after 4 mol.% Y doping in the CeO2crystals, including O−Ce(III), O−Ce(IV), O−Y(III), and VOcorrelation, yielding a rough quantitative assessment of these species. The 4 mol.% Y-doped CeO2(2.0 g/L) demonstrated the highest removal rate for 20 mg/L of AO7 dye within just 20 min to reach adsorption–desorption equilibrium, half the time required by undoped CeO2, achieving an impressive adsorption rate of 94.6%, compared to only 69.5% for undoped CeO2at 20 min. The adsorption capacity of undoped CeO2was enhanced by 19.05% through the doping of 4 mol.% Y, achieving a value of 16.56 mg/L. The feasibility of enhancing the adsorption capacity of CeO2by Y doping provides a reference for the application of CeO2and other metal oxides.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Xiaoqian Li,Shenyong Ren,Lu Liu,Chi Yang
A core-shell structured USY-xTT@NiMo catalyst was prepared through thermal treatment method and evaluated for the catalytic hydrodesulfurization (HDS) performance toward dibenzothiophene (DBT). The shell assembled from NiMoS nano-wool provided abundant active site. This nano-wool morphology and core-shell structure resulted in the catalyst with enhanced specific surface area, pore volume, lower interaction between the support and active metals, and facilitated metal dispersion. In addition, the nano-wool morphology and core-shell structure also promoted the degree of sulfurization and provided more sulfur vacancies, which enhanced the HDS performance of the corresponding catalysts. An efficient USY-16TT@NiMo catalyst with shorter slab lengths (average 2.50 nm), higher average stacking number (3.37 layers), and more edge active sites was assembled, which showed superior k HDS value of DBT up to 8.29 × 10 −4 mol g −1 h −1 and high direct desulfurization selectivity to be 88 %.
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ACS Nano
·
2024
·
IF 15.8
Weijun Wang,Wenqing Wang,Yaxin Chen,Mengling Lin,Yan-Ru Chen,Ruijin Zeng,Tenghang He,Zhifa Shen,Zai-Sheng Wu
A major impediment to the clinical translation of DNA tiling nanostructures is a technical bottleneck for the programmable assembly of DNA architectures with well-defined local geometry due to the inability to achieve both sufficient structural rigidity and a large framework. In this work, a Y-backbone was inserted into each face to construct a superlarge, sufficiently rigidified tetrahedral DNA nanostructure (called RDT) with extremely high efficiency. In RDT, the spatial size increased by 6.86-fold, and the structural rigidity was enhanced at least 4-fold, contributing to an ∼350-fold improvement in the resistance to nucleolytic degradation even without a protective coating. RDT can be mounted onto an artificial lipid-bilayer membrane with molecular-level precision and well-defined spatial orientation that can be validated using the fluorescence resonance energy transfer (FRET) assay. The spatial orientation of Y-shaped backbone-rigidified RDT is unachievable for conventional DNA polyhedrons and ensures a high level of precision in the geometric positioning of diverse biomolecules with an approximately homogeneous environment. In tests of RDT, surface-confined horseradish peroxidase (HRP) exhibited nearly 100% catalytic activity and targeting aptamer-immobilized gold nanoparticles showed 5.3-fold enhanced cellular internalization. Significantly, RDT exhibited a 27.5-fold enhanced structural stability in a bodily environment and did not induce detectable systemic toxicity.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Mingzhe Li,Jiahui Zheng,Fengchun Zheng,Xin Zhang,Yunlong Wang,Kepi Chen,Nian Ran,Wei Zhou,Yuzhen Lv
Developing highly efficient catalysts with ultralow-loading metal is still hindered by the sluggish Volmer–Tafel kinetics for the alkaline hydrogen evolution reaction (HER). Herein, an efficient catalyst was designed and constructed on nickel foam by integrating oxyphilic Y-doped NiO with NiPt1% nanocrystalline via a facile one-step electrodeposition. It requires only 21.2 and 178.5 mV to achieve 10 and 1000 mA cm–2, with a low Tafel slope of 27.8 mV dec–1. Furthermore, it provides an ultrahigh mass activity of 42.7 mA μgpt–1 @ 100 mV and a high stability over 2000 h at 1 A cm–2 almost without potential decay. In-situ experiments and D2O electrolysis tests reveal that the oxyphilic Y-NiO component not only reduces the activation energy of NiPt1% alloy by 32% and enhances its surface hydrogen (*H) coverage 7.8 times but also markedly boosts the Volmer step. Density functional theory calculations further reveal that Y-NiO strengthens water adsorption and shifts both Volmer and Tafel steps on the NiPt1% alloy surface from nonspontaneous to spontaneous, while reducing their energy barriers by 32 and 23%, respectively. This work presents an effective approach for regulating the Volmer–Tafel process in ultralow-loading metal alloys for alkaline HER.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Binghao Wang,Yuzhi Zhang,Xinyu Wang,Jiayu Ma,Maofei Zhang,Lingnan Wu,Changchun Chen
Infrared radiation materials occupy an important position in energy saving of industrial furnaces and thermal protection of spacecraft, but the existing IR radiation materials can hardly satisfy the dual requirements of high emissivity in a wide band and excellent thermal stability at the same time. Here, high-entropy perovskite oxides A(Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 Cu 0.2 )O 3 (A = La, Y) are prepared using solid-phase synthesis. The introduction of the high-entropy design provides the cationic valence behavior, increases oxygen vacancy concentration and reduces the symmetry of the lattice vibration, thus narrowing the band gap, increasing the free carrier concentration, and improving the lattice vibration. This enhances the material's intrinsic absorption, carrier absorption, and lattice vibration absorption, ultimately resulting in a material with high emissivity in a wide band. Among them, La(Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 Cu 0.2 )O 3 shows an emissivity of 0.864 at 0.78–3 μm and 0.855 at 3–8 μm, respectively. Moreover, it exhibits stronger thermal stability, and its emissivity shows an upward trend with the increase of temperature, which highlights the key role of A-site cations in regulating lattice distortion and defect dynamics. This work provides a new paradigm for designing materials with IR radiation performance for service in high-temperature environments.
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DYES AND PIGMENTS
·
2025
·
IF 4.2
Ziyi Lu,Chang Wang,Hailong Cui,Jinglong Li,Meiyu Zhen,Xiaoqing Xiong
Photodynamic antimicrobial technology is an effective approach for eliminating bacteria. With growing emphasis on personal health, the development of functional textiles with photodynamic antimicrobial properties has emerged as a significant research focus. Here, Eosin Y (EY) was employed as the photosensitizer, and poly(caprolactone) (PCL) served as the substrate. A series of photosensitizer-loaded PCL&EY nanofiber membranes were successfully fabricated using electrospinning. The results demonstrated that these nanofiber membranes exhibited excellent fiber diameter distribution, mechanical properties, and hydrophilicity at a photosensitizer content of 0.034 ± 0.001 wt%. To further optimize the properties of the PCL&EY nanofiber membranes, varying concentrations of bovine serum albumin (BSA) were incorporated into the electrospinning solution to modulate the properties of PCL membrane. Among them, the PCL&15EY&75BSA nanofiber membrane with a BSA concentration of 0.166 ± 0.001 wt% exhibited optimal performance across all evaluated parameters, particularly demonstrating a transformation from hydrophobic to hydrophilic properties. Antimicrobial performance tests revealed that the addition of BSA enhanced the photodynamic antibacterial efficiency of the PCL&EY nanofiber membrane, with the PCL&15EY&75BSA membrane achieving bacteriostatic rates of 95 ± 1 % against Escherichia coli ( E. coli ) and 99 ± 1 % against Staphylococcus aureus ( S. aureus ). To expand their applications, these nanofiber membranes were combined with activated carbon masks, creating functional textiles with both high gas permeability and effective antibacterial properties. Therefore, the strategy of incorporating BSA into the electrospinning solution is an effective approach to improving the performance of nanofiber membrane.
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MATERIALS CHARACTERIZATION
·
2025
·
IF 5.5
Qian Wen,Xiaopeng Hu,Junyao Wu,Qing Liu,Sai Liu,Duzhong Zhu,Jinwei Guo,Wang Zhu
Medium-high entropy RETaO 4 (RE = Y, Gd, Yb, Dy, Sm) ceramics are prepared by high-temperature solid-state reaction. Results show that doping rare earth ions into the A site improves the hardness, elastic modulus, fracture toughness, and fracture strength of the ceramics. As the solid solution components increase, hardness rises from 5.19 GPa to 7.43 GPa, elastic modulus from 55.2 GPa to 88.8 GPa, fracture toughness from 1.10 MPa·m 1/2 to 2.05 MPa·m 1/2 , and fracture strength from 31.8 MPa to 58.6 MPa. This enhancement is attributed to higher lattice distortion, increased internal energy, and stronger bonding. The proportion of transgranular fracture increases with solid solution content. Ferroelastic domain structures cause crack tip deflection, leading to greater fracture energy absorption. Furthermore, high-entropy and lattice distortion effects in (5RE 1/5 )TaO 4 ceramics promote high-density dislocation regions under stress, enhancing dislocation toughening.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
·
IF 5.279
Jian Zhang,Fangcheng He,Jixiang Chen,Yanju Wang,Yuyuan Yang,Deyu Hu,Baoan Song
To find efficient and broad-spectrum viral agents, a series of purine nucleoside derivatives containing sulfa ethylamine moieties was designed and synthesized, and their antiviral activities against tobacco mosaic virus (TMV), cucumber mosaic virus (CMV), and potato virus Y (PVY) were evaluated. Some target compounds displayed good antiviral activities. Among them, compound 3 showed excellent protective activity against CMV and PVY with 50% effective concentration values (EC50) of 137 and 209 μg/mL, respectively, which were better than that of the control agent ningnanmycin (508 and 431 μg/mL). Moreover, the EC50 value of compound 3 for the inactivating activity against TMV was 48 μg/mL, which was better than that of ningnanmycin (88 μg/mL). In addition, compound 3 not only destroyed the structure of the TMV virus but also had a good interaction with the coat protein of the TMV virus. Therefore, compound 3 may further destroy the structure of the virus by binding to the coat protein of the TMV virus, thereby weakening the infectivity of the virus.
研究领域:
药理学
·
有机化学
·
病毒学
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