RSC Advances
·
2016
·Vol. 6
·期 102
·100519-100525
·
IF 3.289
Fei Wang,Yang Qiu,Bing-Jie Wang,Hua-Lin Wang,Yi-Tao Long
A green method was developed to fabricate a novel porous polymer microsphere with SERS activity, which can be used for ultrasensitive detection because of its preconcentration function. Ultraviolet irradiation as “green” reduction was successfully achieved through several complex processes, namely, monomer solidification, hydrogen peroxide photolysis, and silver nanoparticle fabrication, in only one step. During the solidification process, H2O and O2, which are originally from H2O2 reduction, escaped from the emulsion templates, resulting in various interconnected micro-/nano-channels. The mean pore size of the prepared porous microspheres was 4 μm, and the specific surface area can reach 31 m2 g−1. The silver nanoparticles produced in the reduction process of silver nitrate were deposited on the porous surface of the microsphere and contributed to stable SERS activity with a SERS enhancement factor of up to 3.8 × 106 and a low detection limit of 10−13 M level for rhodamine 6G. This green method provides highly sensitive and uniform SERS substrates and ensures the stability and reliability of our “SERS substrate”.
研究领域:
分析化学
·
材料科学
·
纳米技术
·
生物传感
·
物理化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yaxin Liu,Dongzhi Yang,Yongzheng Shi,Linna Song,Ruomeng Yu,Jin Qu,Zhong-Zhen Yu
Silver phosphate/graphene oxide aerogel microspheres (SGAMs) with radially oriented microchannels are constructed by electrostatically spraying the as-prepared silver phosphate/graphene oxide/chitosan (Ag3PO4/GO/CS) suspension into numerous microdroplets followed by freezing, lyophilization and cross-linking for highly efficient and continuous removal of pollutants from wastewaters. The resultant aerogel microspheres exhibit both high adsorption rate and large adsorption capacity because of their short internal diffusion pathway and high specific surface area. The synergy between adsorption and visible light photocatalysis endows the porous microspheres an outstanding efficiency of removing pollutants under both static and continuous water treatment conditions. Furthermore, the presence of graphene oxide (GO) efficiently improves the recyclability of Ag3PO4 due to the fast electronic transfer at the interface. More than 95% Rhodamine B (50 mg L–1) is adsorbed by SGAMs in 5 min, and bisphenol A (10 mg L–1) is almost completely photodegraded in 20 min under visible light irradiation. The removal efficiency of bisphenol A in a continuous flow system (0.1 mL min–1) is maintained at 95% over 50 h. In addition, the SGAMs could photodegrade pharmaceuticals and pesticides effectively. This work provides a promising visible light photocatalysis approach for enhancing efficiency and durability of photocatalysts in a continuous water treatment system.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
光催化
·
水处理技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Dandan Li,Congcong Wei,Qiang Wang,Lin Liu,Dazhong Zhong,Genyan Hao,Jinping Li,Qiang Zhao
Silver-based catalysts with an adjustable structure are promising as efficient oxygen evolution catalysts. Four types of silver-oxide (AgO) morphologies were obtained by potentiostatic deposition in situ in organic carboxylate by altering the amount of ammonia as the complexing agent. AgO films can be used in the oxygen-evolution reaction; AgO that is formed by using potassium acetate that contains 1.32 mM ammonia as an electrolyte exhibits preferable performance. Catalyzed water oxidation occurs in 0.1 mol/L potassium phosphate solution (pH 12.3) with an average activity of 3.5 mA/cm 2 , and persists for at least 10 h at 2.03 V (vs. Reversible Hydrogen Electrode, RHE). Overpotential is 438 mV at a current density of 1 mA/cm 2 . The Faradaic efficiency is 94.4%. Samples were well characterized by X-ray powder diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy.
研究领域:
材料化学
·
电化学
·
催化化学
·
能源科学
·
纳米材料
·
可持续能源
·
表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 29
·12008-12019
·
IF 4.5
Sun Qinghe,Hu Liang,Cai Hongkun,Yi Zhehan,Wang Liqun,Liang Ji,Ni Jian,Zhang Jianjun
Rechargeable aqueous zinc-ion batteries (ZIBs) have been gradually attracting attention, because they are inexpensive and abundant; thus, they are favorable choice for energy storage system. Layered vanadium oxides have excellent zinc-ion storage capacity; however, significant challenges, such as poor conductivity and slow zinc-ion intercalation/deintercalation reaction, remain. Herein, we fabricated a material comprising V 2 O 5 and Ag (Ag 0.3 V 2 O 5 , AVO) with a high conductivity and stable structure. Using this strategy, the ZIBs based on the AVO electrode achieved a high capacity of 340 mAh g −1 at 0.10 A g −1 , long-term cyclic stability with over 93.75% retention after 1600 cycles and a nice rate performance (135 mAh g −1 at 2.0 A g −1 ). The nanowire structure was hardly corroded after the reaction. These results indicate that Ag + can become “pillars” for V 2 O 5 , thereby improving the stability of the material. Moreover, Ag + is involved in the reaction of aqueous zinc-ion batteries; thus, the cyclic performance and battery capacity are improved.
研究领域:
储能
·
材料科学
·
电化学
·
纳米技术
·
电池技术
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Puhong Wen,Lili Ai,Fenyan Wei,Dengwei Hu,Jingjing Guo,Fangyi Yao,Taotao Liu
The crystalline hexagonal Nb 2 O 5 (H-Nb 2 O 5 ) nanobelt clusters dominantly exposed (− 110) facet are firstly synthesized by a hydrothermal topological reaction with a precursor of fiber-like K 2 Nb 2 O 6 ·H 2 O. The structure and morphology of samples obtained at different temperatures and times are investigated. There are two steps in the synthesis process. One is the acid-exchanging reaction transforming into amorphous phase protonated niobate (HNO), and the other is dehydration reaction transforming into H-Nb 2 O 5 , and simultaneous dissolution reaction which forms nanobelt cluster morphology from the fiber-like particle. The formation mechanism of H-Nb 2 O 5 nanobelt clusters has been proposed in detail. After photo-reduced reaction between the H-Nb 2 O 5 nanobelt clusters and AgNO 3 solution, the dominantly exposed (− 110) facet of H-Nb 2 O 5 nanobelt is homogeneously covered by Ag nanoparticles . The photo-electrochemical performance of the obtained H-Nb 2 O 5 nanobelt clusters and Ag deposited H-Nb 2 O 5 (Ag-Nb 2 O 5 ) nanobelt clusters as photocatalysts are evaluated by splitting water under simulated sunlight illumination, and the generated photocurrent of Ag-Nb 2 O 5 sample is 10.73 μA, which is 535 times that of the H-Nb 2 O 5 sample. The results demonstrate that the Ag-Nb 2 O 5 nanobelt clusters have a high photo-electrochemical performance as well as good sunlight photoelectric conversion efficiency.
研究领域:
材料科学
·
纳米科技
·
光催化
·
能源化学
·
半导体材料
·
电化学
·
太阳能转换
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Dan Wu,Mengnan Hu,Yongyi Zhang,Jing Zhou,Zhaona Wang
Surface enhanced Raman spectroscopy (SERS) is a key nondestructive detecting technology with a broad application demands. However, relative low stability and homogeneity of the SERS substrate hinder its practical applications. Here, a simple and flexible approach is proposed to achieve the arrayed SERS substrates with the periodicity and local randomness by directly growing silver nanoflowers on the patterned wafer fabricated by the optical interference method. By utilizing the hotspot effect of nanogaps within/between the Ag nanoflowers, the SERS substrates demonstrate the low detecting limit of 5 × 10 −10 M and 5 × 10 −9 M in one-dimensional (1D) and two-dimensional (2D) pattern structures for Rhodamine 6G (R6G) probe molecule, respectively. The periodicity assures the fabricated substrate a promising reproducibility and stability. After the 1D array structure is left for 21 days, the intensity of Raman signal of R6G maintains at 80%. Moreover, the proposed method has the advantages of simple preparation, low cost, flexible tunability, and easy-fabrication large scale substrate. The results indicate that the long-range ordered silver nanoflower array structures are promising candidates for the high performance SERS substrate in chemical analysis, medicine and environment monitoring.
研究领域:
分析化学
·
纳米生物技术
·
材料科学
·
环境监测
·
医学检测
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Gang Tao,Rui Cai,Yejing Wang,Hua Zuo,Huawei He
Hydrogel-based wound dressings are ideal materials as they could provide a moist environment to promote wound healing. Silk sericin is a natural macromolecular protein produced by silkworms and has positive effects on fibroblasts and keratinocytes. Sodium alginate is a natural polysaccharide known as a mouldable matrix. To develop novel hydrogel wound dressings, sodium alginate was functionalized with silk sericin to yield an injectable and mouldable semi-interpenetrating network hydrogel (SA/Se) using calcium ions as the crosslinking agents. Meanwhile, silver nanoparticles (AgNPs) were synthesized in situ by the phenolic hydroxyl group of tyrosine in sericin to enhance the antibacterial activity of the hybrid hydrogel. UV–visible spectroscopy, fluorescence spectroscopy, transmission electron microscope, X-ray photoelectron spectroscopy and energy dispersive spectroscopy demonstrated the successful synthesis of AgNPs with average size of 15.7 nm in SA/Se-Ag0.2. Field emission scanning electron microscopy showed the macroporous structure of the hydrogel. The hybrid hydrogel had a swelling ratio of 32 and more than 5% of retention ratio after 50 h. It exhibited effective antibacterial activity through irreversibly disrupting bacterial membrane structure to result in bacterial lysis and death. Cell counting kit-8 assay suggested the hybrid hydrogel was highly cytocompatible. The animal experiment showed the wound contraction ratio in SA/Se-Ag0.2 group was 99% after 12 days, indicating it can effectively promote wound healing. This novel hydrogel is promising for wound healing and tissue engineering.
研究领域:
生物材料
·
组织工程
·
再生医学
·
创伤修复
·
纳米医学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Bo Pang,Zhan Wu,Wenkui Zhang,Hui Huang,Yongping Gan,Yang Xia,Xinping He,Xinhui Xia,Jun Zhang
Agroydite Li 6 PS 5 Cl is one of the most promising solid electrolytes because of its high ionic conductivity and good processability. However, there are still many challenges with Li 6 PS 5 Cl and lithium anodes that prevent their industrialization, such as the growth of lithium dendrite and interfacial reactions. Interface modification of anodes has proven to be an effective method for solving these problems. Herein, we introduce Ag nanoparticles into the interface between Li 6 PS 5 Cl and metallic lithium and systematically investigate their interfacial properties . By incorporating silver nanoparticles , lithium dendrites can be depleted by forming Li–Ag alloys. Therefore, a denser and more stable interface between Li 6 PS 5 Cl and lithium metals is obtained. Benefiting from the above advantages, the Li/Li symmetrical battery with incorporated Ag nanoparticles exhibited an ultrahigh critical current density of up to 10 mA cm −2 and great cycling stability (more than 600 h). An all-solid-state battery with Ni-rich cathode and lithium metal anode demonstrates a high-capacity retention rate of 84% after 200 cycles at a current density of 0.5C. This study provides new insights into the construction of stable anode interfaces for the practical application of all-solid-state lithium batteries.
研究领域:
材料科学
·
电化学
·
固态离子学
·
能源材料
·
电池技术
·
界面工程
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2024
·Vol. 416
·期 27
·6091-6102
·
IF 3.8
Zhong Huimin,Jiang Cong,Zou Jiahui,Zhu Guancheng,Cheng Mengyue,Huang Yanyan
Toxic ginkgolic acids (GAs) are a challenge for Ginkgo biloba- related food. Although a detection method for GAs is available, bulky instruments limit the field testing of GAs. Herein, by assembling gold nanoclusters with copper tannic acid (CuTA), CuAuTA nanocomposites were designed as peroxidase mimics for the colorimetric determination of GAs. Compared with single CuTA, the obtained CuAuTA nanocomposites possessed enhanced peroxidase-like properties. Based on the inhibitory effect of GAs for the catalytic activity of CuAuTA nanozymes, CuAuTA could be utilized for the colorimetric sensing of GAs with a low limit of quantitation of 0.17 μg mL −1 . Using a smartphone and the ImageJ software in conjunction, a nanozyme-based intelligent detection platform was developed with a detection limit of 0.86 μg mL −1 . This sensing system exhibited good selectivity against other potential interferents. Experimental data demonstrated that GAs might bind to the surface of CuAuTA, blocking the catalytically active sites and resulting in decreased catalytic activity. Our CuAuTA nanozyme-based system could also be applied to detect real ginkgo nut and ginkgo powder samples with recoveries of 93.12–111.6% and relative standard deviations less than 0.3%. Our work may offer a feasible strategy for the determination of GAs and expand the application of nanozymes in food safety detection. Graphical abstract
研究领域:
食品安全
·
纳米技术
·
酶模拟物
·
分析化学
·
生物传感器
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 39
·19231-19240
·
IF 9.931
Minjie Xuan,Weidong Xiao,Hongjie Xu,Yonglong Shen,Zhenzhen Li,Shijie Zhang,Zhuo Wang,Guosheng Shao
The development of a solid electrolyte with superb Li+ conductivity is the key to enabling safe and high-performance all-solid lithium ion batteries which are free of the safety issues associated with flammable organic liquid electrolyte. Systematic experimental work has been carried out as a follow up to our recent theoretical prediction that superb ionic conductivity could be achieved through the tuning of the lattice chemistry in the cubic argyrodite Li6PS5Cl. Remarkable enhancement of the ionic conductivity has been achieved through the combined effect of excess Li and substitution of S with Te. This leads to an alloy, Li6.25PTe0.125S5.125Cl0.75, having the superb Li+ conductivity of 4.5 mS cm−1 at 25 °C, together with a low activation energy of 0.16 eV to safeguard adequate ionic conductivity at low temperature. This current work conclusively affirms the theoretical outcome that the superb ionic conductivity is attributed to weakened bonding, an enlarged unit cell, and a softened lattice, making it easier for the long-distance diffusion of Li+. In addition, this new class of solid electrolyte based on cubic chalcogenide is electrochemically compatible with the Li anode over a large potential window up to 7 V, which is highly desirable for high performance solid lithium ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
固体离子学
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Zhixia Zhang,Long Zhang,Yanyan Liu,Chuang Yu,Xinlin Yan,Bo Xu,Li-min Wang
Li 6 PS 5 X (X = Cl, Br, I) argyrodites possess high ionic conductivity but with rather scattered values due to various processing conditions. In this work, Li 6 PS 5 X solid electrolytes were prepared by solid-state sintering or mechanical alloying and optimized with or without excess Li 2 S. Solid-state sintering prefers excess Li 2 S, whereas mechanical alloying prefers stoichiometric Li 2 S to synthesize high-purity samples with high ionic conductivity. Solid-state sintering is also more suitable than mechanical milling for high ionic conductivity. Li 6 PS 5 Cl with the highest ionic conductivity among Li 6 PS 5 X was comprehensively characterized for electrochemical performance and air stability. MoS 2 /Li 6 PS 5 Cl all-solid-state batteries assembled with Li 6 PS 5 Cl-coated MoS 2 as cathode and with Li 6 PS 5 Cl as solid electrolyte demonstrate high capacity and good cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
无机非金属材料
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2016
·Vol. 60
·期 1
·68-74
·
IF 0
Wang Di,Wang Ruihong,Liu Liyuan,Qu Yang,Wang Guofeng,Li Yadong
Techniques for detecting glucose are developing at a breathtaking speed because diabetes mellitus can cause many serious complications, such as blindness, high blood pressure heart disease and kidney failure. Herein, water soluble NaYF 4 :Eu 3+ @Ag core-shell nanocrystals for glucose detection with lower detection limit have been successfully developed, using NaYF 4 :Eu 3+ cores as the energy donors and Ag shells as the efficient quenchers through energy transfer. After immobilization of glucose oxidase (GOx) on the surface of NaYF 4 :Eu 3+ @Ag core-shell nanocrystals, the Ag shells can be decomposed in the presence of glucose, accompanied by down-shifting luminescence recovery. The limit of detection of NaYF 4 :Eu 3+ @Ag was 0.12 μmol L −1 . Therefore, the NaYF 4 :Eu 3+ @Ag can be easily extended to the detection of a variety of H 2 O 2 -involved analytes.
研究领域:
分析化学
·
纳米生物技术
·
生物传感
·
糖尿病检测
·
分子诊断
·
荧光探针
✓ 已验证
DOI
危险品化学品经营许可证（带存储）