Catalysis Science & Technology
·
2022
·Vol. 12
·期 10
·3209-3218
·
IF 6.177
Meng Tian,Jing Qian,Jiawei Hou,Yadi Bai,Hai-Ying Jiang,Jingyun Ren
Free silver ions (Ag+) in the solution exhibit enhanced photocatalytic dechlorination processes of organic chloride, including 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP), over copper phenylacetylene (PhC2Cu) under visible light irradiation. The concentration of AgNO3 remarkably affects the dechlorination activity of PhC2Cu. With the optimal concentration of 2 mM AgNO3, PhC2Cu showed the best photocatalytic performance, and the dechlorination rate of PhC2Cu was 2.3-fold enhanced under visible light irradiation for 80 minutes. This deep mechanism study demonstrated that free Ag+ in the solution, but not the deposited Ag particles on the surface of PhC2Cu, plays the most imported role in promoting the photocatalytic dechlorination process by forming the insoluble salt of AgCl.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Fengjuan Miao,Bingcheng Sun,Bairui Tao,Yanchun Wang,Paul K. Chu
In this paper, we demonstrate the application of a novel ternary nanocomposite MoS 2 /Ag/TiO 2 photoanode in high efficiency plasma dye sensitive solar cell (PDSSC). Ternary nanocomposites MoS 2 /Ag/TiO 2 was successfully synthesized by a simple solvothermal method without any hazardous substances. In order to achieve higher photoelectric conversion efficiency of DSSC, the photoanode’s ability of capturing light and electron transfer rates needs to be improved. Ag provides a power for light capture, while MoS 2 inhibits electron–hole recombination and promotes electron transport in the ternary nano-composite MoS 2 /Ag/TiO 2 . The nanocomposite was characterized by scanning electron microscope and transmission electronmicroscope, which indicated that the MoS 2 /Ag/TiO 2 was synthesized. Due to local surface plasmon resonance (LSPR), silver nanoparticles were doped onto TiO 2 nanoparticles, which greatly improved the optical parameters. The synthesis of Ag nanoparticles and MoS 2 was confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The performance of dye sensitive solar cell (DSSC) composed of ternary nano-composite material MoS 2 /Ag/TiO 2 was tested, the photoelectric conversion efficiency (PCE) reaches 9.3%, which is 26% higher than that of pure TiO 2 nanoparticle photoanode.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yihan Yun,Wenlong Xie,Zhihua Yang,Guangmao Li,Shilie Pan
Birefringent materials are of great important as opto-electronic functional devices in solid laser system. Investigations on the design of new birefringent materials with large birefringence is meaningful. In this study, structure-birefringence relationship between AgGaS 2 (AGS) and NaGaS 2 (NGS) was systematically investigated. In the structures, the high ionic Na + cations broke the three dimensional (3D) [GaS] network to 2D layers, which results in the regular packing of GaS 4 tetrahedra and further the birefringence (~0.09, nearly twice that of AGS at ~1064 nm). Meanwhile, the blue-shift of the UV cutoff edge to 307 nm and a wide band gap of 3.9 eV has been observed in NGS. The property characterizations were carried out using the as-grown NGS single crystal with a size of 4 × 4 × 0.3 mm 3 by high temperature flux method. The results indicate that NGS may be a promising IR birefringent material and the cation substitution-oriented design strategy could be used to regulate the structure and optical properties of materials.
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2021
·Vol. 11
·期 12
·1521
·
IF 2.589
Jiabin Hao,Zeming Wang,Huiying Hao,Guanlei Wang,Hongcheng Gao,Jianyu Wang,Bing Pan,Qiang Qi
So far, it is still a great challenge to prepare high efficiency organic–inorganic perovskite solar cells in ambient air. Specifically, moisture is easily combined with the perovskite material during the spin-coating process, which result in porous perovskite films with poor surface morphology. In this study, we investigated crystalline Ag-doped perovskite films by a one-step spin-coating method in air with 30–40% relative humidity (RH), in which ethyl acetate (EA) was used as antisolvent can absorb moisture in air to reduced nucleation density. More significantly, EA is a feasible and environmentally friendly solvent to replace highly toxic solvent. Moreover, 1.0% Ag-doped device shows a highest power conversion efficiency (PCE) of 14.36%. The improved performance is not only ascribed to the superior CH3NH3PbI3film with high crystallinity but to the versatile tunability of energy band structure.Keywords:perovskite solar cells;Ag-doped;30–40% RH;ethyl acetate (EA)
✓ 已验证
产品关联
DOI
高影响因子
Journal of Industrial Textiles
·
2021
·
IF 3.732
Xueyan Bian,Jiangtao Xu,Yi Pu,Jing Yang,Ka-lam Chiu,Shouxiang Jiang
Surface enhanced Raman scattering (SERS) has proven to be increasingly valuable as an analytical tool since this phenomenon was first observed in 1973. However, challenges still exist to ensure their ability to access targeted analytes and adequate levels of sensitivity to them on irregular surfaces. Herein, silver (Ag) nanoparticles are deposited onto cotton fabric through magnetron sputtering to develop a flexible and ultrasensitive SERS-active substrate. To obtain a better enhancement effect, Ag nanoparticles of different sizes are produced by controlling the argon flow rate and the sputtering time. The finite-difference time-domain (FDTD) method and Raman mapping are used to explain the process behind Raman signal enhancement. The cotton fabric sample with Ag nanoparticles deposited at an argon flow rate of 200 sccm (labelled as AC-200) shows a high enhancement factor (EF) of 104 with a Methylene blue (MB) solution of 10−3 M, stability with a related standard deviation (RSD) of 1.03%, excellent reproducibility with an RSD of 1.92% and high sensitivity with 10−9 M of MB solution. Therefore, AC-200 demonstrates exceptional SERS signal reproducibility and stability for different types of chemical analytes and has the potential to be used in future practical applications.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Qi Han,Yan Li,Xiaopeng Lu,Di Mei,Qianqian Chen,Tao Zhang,Fuhui Wang
Antibacterial plasma electrolytic oxidation (PEO) coatings have been fabricated by in-situ incorporation of Ag particles on pure Mg. It was found that the Ag particles have been partly oxidized and incorporated into the layer during coating formation process. Ag containing PEO coatings can strongly inhibit the growth of S. aureus and the antibacterial efficiency of the coatings is mainly associated with the Ag concentration in the layer. The antibacterial rate of the coating reaches 99% and is maintained to be stable when sufficient Ag particles (above 1 wt%) are incorporated into the layer.
✓ 已验证
产品关联
DOI
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 ).
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Krishnamoorthy Rajavel,Yougen Hu,Pengli Zhu,Rong Sun,Chingping Wong
The development of smart, structured hybrid materials with superior electrical conductivity are vastly desired for the depletion of unwanted electromagnetic interference (EMI). Herein, novel multilayered two-dimensional MXene/Metal Oxides-Ag ternary hybrid nanostructures with various heterogeneous assemblies were constructed by self-reduction and oxidation of MXene (Nb 2 CT x and Ti 3 C 2 T x ) in the presence of metallic salt (AgNO 3 ), and its EMI shielding performance in X- and K u -band are demonstrated. The effect of different silver nitrate addition into MXene on their structural evaluation reveals that the successful formation of MXene/Metal Oxides-Ag (Nb 2 CT x /Nb 2 O 5 -Ag; Ti 3 C 2 T x /TiO 2 -Ag) ternary hybrid nanostructures derived from MXene (Nb 2 CT x ; Ti 3 C 2 T x ). Remarkably, the Nb 2 CT x /Nb 2 O 5 -Ag hybrid assembly attains reflection dominated shielding performance with a maximum total shielding effectiveness of 68.76 dB and 72.04 dB in the X- and K u -band region respectively at a thickness of 1 mm compared to other nanostructures. The large enhancement in electromagnetic shielding capability of ternary nanostructure attributed to the strong electrical conductivity and increased interface polarization and multiple reflection loss between the ternary interfaces. The synergistic effect of metallic silver nanoparticles, semiconducting metal oxides and conducting stacked multilayer causes to conduction loss, polarization effect (dipole, and interfacial polarization), and multiple reflections of incoming radiation favor the complete dissipation of EM waves. Consequently, the demonstrated simple, cost-effective, and large scale production of highly conductive composites could pave for the potential prospect materials in advanced EM wave shielding applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lijuan Fu,Junsheng Yu,Jinsong Wang,Fan Xie,Shun Yao,Yongsong Zhang,Jiang Cheng,Lu Li
CuSbS 2 has been considered as a promising photovoltaic absorber material, due to its earth abundant and environmentally friendly constituents. However, the electron affinity and similar radius of cations bring heavy atomic disorders in CuSbS 2 film, limiting its photovoltaic performance. Herein, we report an efficient way to reduce disorders by introducing Ag atom into CuSbS 2 crystal structure. The crystal structure and chemical analysis confirm that Ag occupies the Cu position in the as-prepared films by the spray pyrolysis. The absorption spectra combined with photoluminescence measurement indicate that Ag-substituted CuSbS 2 films have fewer recombination centers. The density functional theory calculation result reveals that Ag-substituted CuSbS 2 has a more stable crystal structure, and the formation energy of the primary point defects obviously increases. Therefore, Ag-substituted CuSbS 2 photovoltaic device shows asignificantly improved power conversion efficiency from 0.73% to 2.48%.
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Junjie Yuan,Baoxin Wang,Chen Han,Xiaoyan Huang,Haijun Xiao,Xiao Lu,Jianxi Lu,Dong Zhang,Feng Xue,Youzhuan Xie
The treatment of infectious or potentially infective bone defects remains a major problem in clinical practice. Silver has the ability to potentiate antibiotics against resistant bacterial strains. In order to reduce the risk of long-term infections, it is necessary for the biomaterial scaffold to release Ag + in a controlled manner during the entire healing process. In this study, given the antimicrobial characteristics of nanosized Ag (NSAg), we synthesized β-tricalcium phosphate (β-TCP) doped with 5 and 10 wt% NSAg (5 wt% NSAgTCP and 10 wt% NSAgTCP, respectively). The NSAgTCP composites exhibited similar macroporous structures to pure β-TCP. The NSAgTCP samples were examined by scanning electron microscopy at 10,000-times magnification, which revealed that silver was still present at the nanometer scale. X-ray diffraction revealed that silver does not change the crystalline properties of β-TCP. In addition, we observed that the mechanical strength of NSAgTCP increased with increasing amounts of added Ag. The antibacterial, physical, and chemical properties of NSAgTCP were investigated in vitro. We found that NSAgTCP is effective at inhibiting the growth of Staphylococcus aureus and Escherichia coli and is not cytotoxic to human bone marrow mesenchymal stem cells. Moreover, it does not hinder liver or kidney function when tested in vivo. As the bioceramic degrades, Ag ions are slowly released and new bone is formed. No significant cytotoxic effects were observed even when 10 wt% NSAgTCP was used. NSAgTCP has the ability to simultaneously repair bone defects and act as an anti-infective agent; hence, we expect that this material, with its good bone-repairing and anti-infective properties, will find wide spread use as a novel bone substitute.
✓ 已验证
产品关联
DOI
PubMed
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
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Lubricants
·
2022
·Vol. 10
·期 12
·343
·
IF 3.584
Yanxin Zhang,Jun Cheng,Changfeng Lu,Hao Chen,Guoxin Xie,Lin Zhang,Jianbin Luo
Nanoparticles agglomerate easily because of their high surface energy, which seriously reduces their tribological properties as lubricant additives. In this work, the core-shell nanoparticles Ag@polydopamine (PDA) were successfully prepared by the self-oxidation of dopamine hydrochloride on the surface of Ag nanoparticles and the dispersion of Ag nanoparticles in PAO6 was improved to promote anti-wear behaviors. The tribological properties of Ag@PDA nanocomposites as additives in poly alpha olefin (PAO) oil were studied under different concentrations, pressure and speed conditions by UMT-5 tribometer. It was demonstrated that the strong electrostatic repulsion of the PDA structure made the Ag nanoparticles better dispersed in PAO oil, thus playing a better lubricating role. When the concentration of the modified nanoparticles was 0.25 wt%, the friction coefficient of the lubricating oil decreased by 18.67% and no obvious wear was observed on the friction pair surface. When the Ag@PDA content was higher than 0.25 wt%, the tribological performance of the lubricating oil was weakened, which may be due to excessive Ag@PDA acting as an abrasive on the friction surface, thereby increasing friction and wear. The friction coefficient of the lubricating oil containing Ag@PDA decreased with the increase in load, but hardly changed with the increase in frequency.Keywords:Ag;polydopamine;core-shell;additives;dispersion
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）