APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Ziyuan Jiang,Jiaqi Pan,Beibei Wang,Chaorong Li
The two dimensional(2D) Z-scheme AgCl/Ag/Ca/TiO 3 nano-heterojunction is synthesized via simple preparation of hydrothermal-chemical co-deposition method. The results of SEM, EDS, elemental mapping, XRD, TEM, XPS and Raman shift imply that the AgCl/Ag nanoparticles have deposited on the surfaces of CaTiO 3 nanosheets successfully. Compared with the unmodified samples, the photocatalytic activity of the as-prepared 2D AgCl/Ag/CaTiO 3 nano-heterojunction exhibits a remarkable enhancement by the hydrogen production. Further, the photocatalytic process has been studied and the mechanism of the photocatalytic hydrogen production enhancement has been provided, which could be ascribed to the Z-scheme heterojunction and 2D lamellar structure of the CaTiO 3 .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Kun Chen,Chaoqun Ma,Guoqing Chen,Taiqun Yang,Hui Gao,Lei Li,Zichen Yang,Jun Cao,Chenkai Zheng,Longyao Ma
This study presents the design of a Surface-enhanced Raman scattering (SERS) substrate, COF@Ag, for the sensitive detection of Amoxicillin (AMX) in lake water and honey. Furthermore, the study investigates the role of covalent organic frameworks (COFs) in SERS detection. The characterization results demonstrate the capability of COFs to efficiently enrich Ag nanoparticles (AgNPs), resulting in a more concentrated distribution of hotspots and an enhanced electromagnetic field on the substrate. By employing density functional theory (DFT) simulation, the frontier electronic orbitals of COFs and AMX were analyzed, and the chemical bonds and weak interactions in the system were examined using the Interaction Region Indicator (IRI) method to propose potential enhancement mechanisms. In aqueous solutions, the linear range is 1 μg/L-30 μg/L, with a limit of detection (LOD) 0.279 μg/L. In lake water, the linear range span from 100 μg/L to 500 μg/L, with a detection limit of 8.244 μg/L. For honey, the linear range extend from 20 ng/g to 100 ng/g, with a detection limit of 2.917 ng/g. This method holds key significance in facilitating the rapid detection of amoxicillin and advancing the application of COFs in SERS.
研究领域:
分析化学
·
材料科学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yingnan Quan,Jia Li,Mingyue Hu,Maobin Wei,Jinghai Yang,Ming Gao,Yang Liu
A highly sensitive strategy is urgently needed to detect potential cancer biomarkers present at trace levels in the early stages of the disease. Here we report a surface-enhanced Raman spectroscopy (SERS) biosensor that combines enrichment capabilities, MoS 2 @ZnO@Ag, for the ultrasensitive detection of free bilirubin in serum, and was likely to be used for accurate diagnosis of related diseases. The substrate is evolved from the reported MoS 2 @ZnO with Ag nanoparticles attached to it, which integrates the advantages of low cost, simple pretreatment and high sensitivity, and can accurately and quantitatively analyze actual bilirubin samples. The sensing efficiency is evaluated by bilirubin with the detection limit of 10 -8 M. Main emphasis focuses on using MoS 2 @ZnO@Ag SERS substrate to detect the free bilirubin in serum. This substrate exhibits ultrahigh sensitivity in sensing bilirubin in human blood. In this study, the MoS 2 @ZnO@Ag provides a new biosensing technology for the detection of free bilirubin, which is expected to be applied to clinical diagnosis.
研究领域:
生物医学工程
·
分析化学
·
临床诊断
✓ 已验证
DOI
高影响因子
Journal of the Iranian Chemical Society
·
2024
·
IF 2.2
Fan Zhen,Li Chunxia,Xu Meijie
ZnO/Ag nanocomposite was prepared via in situ method by using silver nitrate and ZnSO 4 as the raw material. ZnO and ZnO/Ag were characterized by utilizing SEM, UV-vis, XRD, FTIR, and so on. The photocataytic degradation behaviors of ZnO and ZnO/Ag for trimethylamine (TEA) in air and solution were studied. The results indicated that ZnO/Ag had better photocatalytic degradation properties on trimethylamine under the condition of 0.06 g catalyst, 2 h photocatalytic time, and 15 A light intensity, and the degradation rates of TEA were up to 44 and 67% in air and solution, respectively. Furtherly, ZnO and ZnO/Ag also indicated perfect photocatalytic degradation properties toward to organic compounds in wastewater. Especially, the harmless treatment of triethylamine was achieved by using photocatalytic degradation method that provided a novel method for treating triethylamine. In all the above results leaded to a good application prospect of ZnO/Ag in the degradation of organic compounds in air and solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Wei Li,Shu-ao He,Wei Xu,Ji Li,Xue-chuan Wang
In this research, a series of BiOCl-Ag/AgBr x (BAA x ) heterojunctions with surface plasmon resonance (SPR) effect of metallic Ag were synthesized by a facile one-pot solvothermal method . For the superior photosensitive effect of AgBr co-catalyst, all BAA x samples exhibited much enhanced response to visible light. For the formation of BiOCl-AgBr heterojunction and existence of metallic Ag plasma, the BAA x photocatalysts exhibited very superior interfacial charge migration, and the recombination of photoexcited electron-hole pairs could be effectively controlled. Research showed that the BAA 0.04 heterojunction exhibited the highest photocatalytic activity under visible light irradiation , and various pollutants in water system could be decomposed effectively. Furthermore, the BAA 0.04 heterojunction possessed very robust photostability, its crystal structure and photocatalytic activity almost remained unchanged after being used several times.
研究领域:
材料科学
·
环境科学
·
光化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiaoni Du,Xiaohong Wang
A new and efficient series of photocatalysts , Bi 5 O 7 NO 3 and Ag/Bi 5 O 7 NO 3 composites, were successfully prepared by a one-pot solution combustion synthesis (SCS) method. Bi(NO 3 ) 3 , C 4 H 6 O 6 , and AgNO 3 were used as the oxidant, fuel, and Ag source, respectively. The crystals structure of the orthorhombic Bi 5 O 7 NO 3 and cubic Ag was characterized by employing XRD and EPMA techniques. Both Bi 5 O 7 NO 3 and Ag/Bi 5 O 7 NO 3 composites showed good photocatalytic degradation efficiencies for methyl orange (MO) under visible-light irradiation. The PL analysis results showed metallic Ag played a vital role in improving the separation of photo-induced electrons and holes, leading to the enhancement of photocatalytic activity. The Ag-5% composite showed the highest photocatalytic degradation efficiency (95% at 60 min), which is 1.5 times more than that of pure Bi 5 O 7 NO 3 .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Lu Junlin,Shang Chaoqun,Meng Qingguo,Lv Haiqin,Chen Zhihong,Liao Hua,Li Ming,Zhang Yongguang,Jin Mingliang,Yuan Mingzhe,Wang Xin,Zhou Guofu
A series of novel visible light driven all-solid-state Z-scheme BiOBr 0.3 I 0.7 /Ag/AgI photocatalysts were synthesized by facile in situ precipitation and photo-reduction methods. Under visible light irradiation, the BiOBr 0.3 I 0.7 /Ag/AgI samples exhibited enhanced photocatalytic activity compared to BiOBr 0.3 I 0.7 and AgI in the degradation of methyl orange (MO). The optimal ratio of added elemental Ag was 15%, which degraded 89% of MO within 20 min. The enhanced photocatalytic activity of BiOBr 0.3 I 0.7 /Ag/AgI can be ascribed to the efficient separation of photo-generated electron–hole pairs through a Z-scheme charge-carrier migration pathway, in which Ag nanoparticles act as electron mediators. The mechanism study indicated that ·O 2 − and h + are active radicals for photocatalytic degradation and that a small amount of ·OH also participates in the photocatalytic degradation process.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yanlin Li,Wenyuan Duan,Jian Wei
At present, there is an urgent need to design sensitive substrates for the Raman analysis system to detect potential substances that have major ramifications for health care and the ecological environment. In this work, CoFe2O4/Ag nanostructures with two different morphologies were successfully synthesized as surface-enhanced Raman scattering (SERS) substrates. The as-prepared strawberry-like CoFe2O4@SiO2@Ag and snowman-like CoFe2O4-Ag Janus not only displayed high sensitivity due to the surface plasma resonance (SPR) of Ag nanoparticles and special micro-nano structure but also showed good stability, which was determined by Raman measurement and enhancement factor calculation. Moreover, excellent magnetic response ensured that the composites could be separated rapidly and reused effectively. It was demonstrated that the as-synthesized CoFe2O4@SiO2@Ag and CoFe2O4-Ag Janus composites had great potential as separable, reusable, and active SERS substrates.
研究领域:
材料科学
·
分析化学
·
环境科学
·
生物医学
✓ 已验证
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2023
·Vol. 220
·期 17
·2300261
·
IF 2
Ting Li,Mengzhou Ma,Junhai Wang,Qiang Li,Yunwu Yu,Qianqian Zou,Xinran Li,Xiaoyi Wei,Tingting Yan,Yulan Tang
As an efficient, safe, and environmentally friendly technology, semiconductor photocatalysis has been widely used in the removal of antibiotics from wastewater. In this work, a novel Ag/BiOI/g-C 3 N 4 composite photocatalytic material, BiOI/g-C 3 N 4 , g-C 3 N 4 , and BiOI are prepared as the photocatalysts. The morphologies, chemical properties, and photocatalytic performances of the photocatalysts are characterized using scanning electron microscope, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier-transform infrared spectrometer, ultraviolet–visible spectroscopy (UV–Vis) diffuse reflectance spectra, and photoluminescence spectra. In addition, tetracycline hydrochloride (TC) and ceftiofur sodium aqueous solutions are used to simulate wastewater and the photocatalytic degradation performances of the photocatalysts are investigated and compared under visible light. Compared to g-C 3 N 4 , BiOI, and BiOI/g-C 3 N 4 , the Ag/BiOI/g-C 3 N 4 demonstrates superior performance, increasing the removal rates of TC and ceftiofur sodium to 85.6% and 90.2%, respectively. The photocatalytic mechanism of the Ag/BiOI/g-C 3 N 4 may involve the promotion of the visible light–harvesting ability and inhibition of the recombination of photogenerated electron/hole pairs. Furthermore, the primary active groups in the system are identified as superoxide radicals (·O 2 − ) and hydroxyl radicals (·OH). Herein, some valuable insights into the development of innovative photocatalytic materials are offered for the effective removal of antibiotics from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2012
·Vol. 7
·期 8
·1781-1788
·
IF 4.5
Shaofeng Zhang,Wei Wu,Xiangheng Xiao,Juan Zhou,Jinxia Xu,Feng Ren,Changzhong Jiang
Graphical Silver surfer : Polymer-supported bimetallic nanocomposites (PS-Ag@AuAg) were synthesized by using a seed-growth process. The LSPR of these composites could be tailored over a large scale. The catalytic activity of the nanocomposites was remarkably superior to that of the supported monometallic nanocomposites. Supported noble bimetallic nanomaterials have attracted great interest owing to their applications in catalysis. Herein, polystyrene-supported Ag@AgAu bimetallic nanocomposites were synthesized by using a seed-growth route. The size and degree of coverage of the Ag@AgAu NPs could be controlled by changing the experimental parameters. SEM, TEM, STEM, EDS, and XPS analysis was used to characterize the morphology, structure, and composition of these nanocomposites. We found that the bimetallic nanoparticles on the polystyrene beads had a core–shell structure that was comprised of a Ag core and a AgAu alloy shell. The optical properties of the nanocomposites were also studied by UV/Vis/NIR spectroscopy, which indicated that the localized surface plasmon resonance (LSPR) absorptions of the nanocomposites could be tailored over a large scale from 450 nm to 950 nm. The catalytic properties of the nanocomposites were studied by using the reduction of 4-nitrophenol (4-NP) by NaBH 4 as a model system. The results showed that the catalytic activity of the polystyrene-supported Ag@AgAu bimetallic nanocomposites was remarkably superior to that of polystyrene-supported monometallic Ag and Au nanocomposites with the same nanoparticle size. In addition, an investigation of the recycling catalytic activity of the PS-Ag@AgAu nanocomposites revealed that the catalyst possessed good stability. The enhancement of the catalytic activity was proposed to be due to the ligand and strain effects between Ag and Au.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 16
·21297-21307
·
IF 2.478
Cao Yong,Luo Penghui,Xu Yang,Zhang Cong,Tian Chang,You Yuanqi,Tian Meiling,Wang Liqiong,Zhou Shenggang
In this paper, a hydrothermal synthesis method synthesized a foamed nickel (NF)-supported Ag-doped Ag 2 S@MoS 2 hydrogen evolution catalyst. Silver doping can improve the conductivity of MoS 2 , thereby improving the hydrogen evolution activity of MoS 2 . Compared with a single MoS 2 , the Ag 2 S@MoS 2 electrode has a larger specific surface area and has many highly catalytic S edges. In 1 M KOH, the overpotential of Ag 2 S@Ag 0.33 MoS 2 /NF electrode at 10 mA cm −2 is approximately 188 mV. Comparing with the overpotential of NF (391 mV) and MoS 2 /NF (290 mV), it is much lower. Further changing the amount of silver added, the overpotential of Ag 2 S@Ag 0.5 MoS 2 /NF is further reduced to 165 mV at a current density of 10 mA cm −2 . When the voltage is 0.35 V, the current densities of Ag 2 S@Ag 0.33 MoS 2 /NF (42.45 mA cm −2 ) and Ag 2 S@Ag 0.5 MoS 2 /NF (55.5 mA cm −2 ) are higher than those of NF (4.91 mA cm −2 ) and MoS 2 /NF (20.51 mA cm −2 ).
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 11
·1520
·
IF 4.034
Lei Qiu,Jiaxiong Xu,Xiao Tian
Ag and Mn dopants were incorporated into Cu2ZnSnS4thin film to reduce defects in thin film and improve thin film properties. Sol–gel and spin-coating techniques were employed to deposit Ag and Mn co-doped Cu2ZnSnS4thin films. The structures, compositions, morphologies, and optical properties of the co-doped thin films were characterized. The experimental results indicate the formation of kesterite structure without Ag and Mn secondary phases. The amount of Ag in the thin films is close to that in the sols. The co-doped Cu2ZnSnS4thin films have an absorption coefficient of larger than 1.3 × 104cm−1, a direct optical band gap of 1.54–2.14 eV, and enhanced photoluminescence. The nonradiative recombination in Cu2ZnSnS4thin film is reduced by Ag and Mn co-doping. The experimental results show that Ag and Mn incorporation can improve the properties of Cu2ZnSnS4thin film.Keywords:Cu2ZnSnS4;Ag and Mn co-doping;thin films;sol–gel preparation
研究领域:
材料科学
·
半导体物理
·
光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）