Optical Materials Express
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2022
·Vol. 12
·期 9
·3718-3730
·
IF 3.074
Luyao Wang,Mingjin Liu,Biao Chen,Jie Pan,Shuyun Wang,Chao Zhang,Zhen Li,Qianqian Peng,Xianwu Xiu
Combing the merits of metals and semiconductors,with superior plasmon resonance effects and high charge mobility, 3D-nanocomposite structures consisting of graphene oxide (GO), noble metal nanostructures, and two-dimensional transition metal sulfides (2D-TMDS) are an important topic in surface-enhanced Raman scattering (SERS) research. This paper presents a novel GO/Ag NPs (silver nanoparticles)/WS2 composite SERS substrate, and electric field simulation by COMSOL software. The GO/Ag/WS2 composite substrate shows very high SERS detective sensitivity and stability to probe molecules such as rhodamine 6 g (R6G), crystal violet (CV), methylene blue (MB) and deoxyribonucleic acid (DNA). The SERS sensitivity can reach 10−12 M, the relative standard deviation (RSD) is 8.24%, and the enhancement factor (EF) is approximately 6.60 × 1010 for R6G, which promoted the implementation of the SERS technique in the area of quantitative profiling and testing.
研究领域:
材料科学
·
光谱学
·
纳米技术
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DOI
高影响因子
Journal of CO2 Utilization
·
2021
·
IF 7.132
Danqing Shu,Miao Wang,Fengyu Tian,Honglei Zhang,Chuang Peng
Electroreduction of CO 2 to high value-added products such as hydrocarbons provides a promising way to create a carbon neutral circular economy. Copper (Cu) is the most effective metal catalyst with selectivity towards hydrocarbons but Cu catalyst alone generally produces hydrocarbons at low selectivity and yield. Operando surface enhanced infrared absorption spectroscopic (SEIRAS) analysis reveals that the low hydrocarbon yield is attributed to the poor ability of Cu to produce carbon monoxide (CO), which is a crucial intermediate for hydrocarbon formation. In the current study, an Ag-Cu dual-cathode CO 2 RR device is developed, which allows separate control of electrode potential. This dual-cathode cell shows increased hydrocarbon yield (83 % for methane and 106 % for ethylene) and a 200 mV lower onset potential for C 2 H 4 , compared to electrolysis with a single Cu cathode. The CO produced by the Ag cathode transfers to Cu and increase its CO coverage, facilitating methane formation as well as promoting C C coupling to form ethylene. This study also reveals a mismatch of optimum electrode potential between Ag and Cu, which results in compromised performance of the two components in an Ag-Cu bimetallic electrocatalyst, but poses no challenge in the dual-cathode cell. To optimize the performance of the dual-cathode cell, we propose the use of a single-pass dual-gas-diffusion-cathode reactor with enhanced mass transfer for maximum hydrocarbon production. This work verifies that splitting the complex CO 2 RR process into two separate steps is a feasible method to improve the overall efficiency and rate of advanced products while reducing the energy input.
研究领域:
能源化学
·
电催化
·
材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chao Ji,Ying Wang,Zhenqiang Ye,Liyuan Tan,Dasha Mao,Wenguang Zhao,Xiaoliang Zeng,Changzeng Yan,Rong Sun,Dae Joon Kang,Jianbin Xu,Ching-Ping Wong
High-performance thermal management materials are essential in miniaturized, highly integrated, and high-power modern electronics for heat dissipation. In this context, the large interface thermal resistance (ITR) that occurs between fillers and the organic matrix in polymer-based nanocomposites greatly limits their thermal conductive performance. Herein, through-plane direction aligned three-dimensional (3D) MXene/silver (Ag) aerogels are designed as heat transferring skeletons for epoxy nanocomposites. Ag nanoparticles (NPs) were in situ decorated on exfoliated MXene nanosheets to ensure good contact, and subsequent welding of ice-templated MXene/Ag nanofillers at low temperature of ∼200 °C reduced contact resistance between individual MXene sheets. Monte Carlo simulations suggest that thermal interficial resistance (R0) of the MXene/Ag–epoxy nanocomposite was 4.5 × 10–7 m2 W–1 K–1, which was less than that of the MXene–epoxy nanocomposite (Rc = 5.2 × 10–7 m2 W–1 K–1). Furthermore, a large-scale atomic/molecular massively parallel simulator was employed to calculate the interfacial resistance. It was found that RMXene = 2.4 × 10–9 m2 K W–1, and RMXene-Ag = 2.0 ×10–9 m2 K W–1, respectively, indicating that the Ag NP enhanced the interfacial heat transport. At a relatively low loading of 15.1 vol %, through-plane thermal conductivity reached a value as high as 2.65 W m–1 K–1, which is 1225 % higher than that of pure epoxy resin. Furthermore, MXene/Ag–epoxy nanocomposite film exhibits an impressive thermal conductive property when applied on a Millet 8 and Dell computer for heat dissipation.
研究领域:
材料科学
·
热管理技术
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高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 10
·1175-1182
·
IF 1.815
Wang Wenyan,He Yiming,Wu Tinghua,Wu Ying
SnZn(OH) 6 (ZHS) hollow cubes were synthesized by a facile self-templated method at room temperature, and Ag/AgCl/ZHS particles were prepared by a photodepositing method. The crystalline structure and morphology of the prepared particles were characterized by x-ray diffraction, UV-vis diffuse reflectance spectroscopy, scanning electron microscopy, and N 2 adsorption. The results indicated that the particles had almost uniform monoclinic geometry and size. The photocatalytic oxidation of Rhodamine B was used to evaluate the photocatalytic activity of the synthesized photocatalysts. It is found that the hollow Ag/AgCl/ZHS showed the highest catalytic performance under visible or UV light, which can be attributed to the synergetic effect of Ag, AgCl, and ZHS.
研究领域:
材料科学
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光催化
·
纳米材料
·
环境化学
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DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Huajuan Wang,Yiming Wu,Han Zou,Zhiyong Song,Yudong Wang,Hongxun Wang,Min Zhou
Photothermal therapy (PTT) is a promising method to kill pathogenic bacteria. However, using single-modal PTT, it is easy to cause tissue damage because of the overtemperature. Hence, it is necessary to combine PTT with other antibacterial strategies. In this study, we employed silver nanoparticles (Ag NPs) and mesoporous polydopamine (MPDA) nanoparticles to establish a multimodal antibacterial platform (MPDA@Ag). MPDA nanoparticles not only served as a photothermal transduction agent to convert light-energy to heat under the irradiation of near-infrared (NIR) light but also acted as a reducer to reduce Ag NPs in situ. Because Ag NPs can effectively kill bacteria, MPDA@Ag can overcome the drawbacks of the single-modal PTT antibacterial strategy, achieving a synergistic antibacterial effect. Moreover, as an antibiotic-free strategy, MPDA@Ag was less likely to induce drug resistance when killing bacteria. In summary, this platform offered a simple and practical means to achieve excellent antibacterial activity and supplied a good alternative to fight pathogenic bacteria.
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Luo lixia,Ye ying,Wang hong,Liu zhe,Li Jiqian
A cholesteric chiral artificial receptor L5 was synthesized, which recognized and cooperated with Ag + in metal ions, and a rapid method for detecting Ag + was established in food. It was found by fluorescence spectroscopy analysis that the L5 could recognize Ag + in DMSO solution; with the help of fluorescence and UV titration, job test and interference test to verify its recognition pattern, and founded that the L5 and guest Ag + were combined with 1:1 coordination ratio. Then, the recognition mechanism between L5 and guest Ag + was explored by measures of nuclear magnetic titration, infrared spectroscopy, electron microscopy and computer molecular simulation. It was speculated that the carbonyl oxygen atom near the amide of the MeO-PhCONH group and the carbonyl oxygen atom of the –COOCH 3 group cooperated with Ag + throµgh electrostatic gravitational interaction. This method was used to establish the detection of Ag + in food in which the detection limit of L5 for Ag + was derived as 0.13 µmol/L, and the silver ions in wolfberry, milk powder,wheat flour, tea leaf and soybean were accurately detected. This method can be used to quantify Ag + content in actual samples accurately and efficiently.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
YingTe Wang,RongRong Wu,YuanYuan Zhang,SiRong Cheng,Yong Zhang
N-doped carbon dots (N CDs) with green fluorescence is developed by the hydrothermal reaction with o-aminophenol and ethylenediamine as carbon and nitrogen sources, and the quantum yield (QY) is 38.4%. The N CDs are characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), Ultraviolet-visible absorption spectroscopy (UV–vis) and fluorescence spectroscopy. The results show that N CDs have good fluorescence properties and stability, and the N CDs are further utilized as a sensor for Ag + via the static quenching effect (SQE) (λ ex =430 nm, λ em =510 nm). The linear range of Ag + is 30–210 µmol/L with a limit of detection (LOD) of 4.7 µmol/L (S/ N = 3). On this basis, we quantitatively detect Ag + in real samples. Furthermore, due to the excellent fluorescence performance, the N CDs are found to be an effective tool for Ag + sensing in bioimaging.
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高影响因子
CHEMICAL PAPERS
·
2022
·Vol. 77
·期 4
·2115-2124
·
IF 2.146
Lin Yamei,Zhi Hongxin,Liu Shengkai,Chen Boyu,Fu Yujie,Liu Zhiguo
Proanthocyanidins-functionalized Fe 3 O 4 @ Ag nanoparticles (Fe 3 O 4 @ AgNPs) were synthesized by one-step hydrothermal method wherein silver nanocrystals were grown in situ on the surface of Fe 3 O 4 nanoparticles with the assistance of proanthocyanidins. The morphology and structure of Fe 3 O 4 @ AgNPs were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier-transform infrared spectrometer (FTIR), UV–Vis spectrophotometer (UV–Vis), X-ray powder diffractometer (XRD), and physical property measurement system (PPMS). The characterization results indicated that sliver nanocrystals were deposited on the surface of Fe 3 O 4 nanoparticles to form spherical and uniformly dispersed Fe 3 O 4 @ AgNPs. Moreover, the Fe 3 O 4 @ AgNPs had a high magnetic response, which can be recovered from the environment. The antibacterial activity of the Fe 3 O 4 @ AgNPs against Escherichia coli ( E. coli ), Staphylococcus aureus ( S. aureus ), and Candida albicans ( C. albicans ) was investigated. The results confirmed that the Fe 3 O 4 @ AgNPs had broad-spectrum antibacterial activity. At the same time, the adsorption property of the nanoparticles for heavy metal ions Cu 2+ , Pb 2+ , and Cd 2+ was also studied. The results showed that pH and incubation time played an essential role in the removal of heavy metal ions, and the nanoparticles had excellent removal efficiency. The multifunctional nanomaterial Fe 3 O 4 @ AgNPs prepared by this study have the potential to apply in the biomedical and water disinfection fields.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhizhou Cai,Ning Cao,Fanxing Zhang,Xiangzhou Lv,Ke Wang,Yi He,Yao Shi,Hao Bin Wu,Pengfei Xie
Electrocatalytic CO 2 reduction into ethanol driven by renewable energy represents a promising strategy for energy storage and mitigation of global warming, but it has remained challenging to gain high activity and selectivity of ethanol. Here we take advantage of atomic arrangement in immiscible Ag-Cu composite during annealing and establish hierarchical interfaces in the obtained core-shell catalyst. The atomic Ag-Cu interactions increase electrochemical surface area and expedite charge dynamics, resulting in an unprecedented electrocatalytic performance with the faradaic efficiency of C 2+ products, ethanol as 80.2 %, 52.6 % and the current density of ∼320 mA cm −2 at −1.0 V (versus reversible hydrogen electrode). Moreover, the Ag-Cu catalyst exhibits a notable stability for ∼60 h. Mechanism studies reveal that local CO intermediates preferentially accumulate on the core, then migrate to the continuous Cu surface for C-C coupling energy-favorably toward ethanol. Our work highlights a novel design principle as interface engineering for advanced tandem electrocatalysts.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 2
·1-10
·
IF 2.8
Zhang Zhen,Li Jinglong,Liu Tao,Tian Wenhuai,Li Zhipeng
Conducting films are becoming increasingly crucial for the electronics industry with applications in various technologies including high-power microelectronic packaging, photovoltaics, and flexible displays. The films with high conductivity were normally fabricated by sintering of printed inks with micrometer size particles. However, the resolution of printed pattern and high sintering temperature limit its application due to the particle size. Herein, we report a stable bimetallic alloy nanoparticle (Au–Ag) sintering inks with low sintering temperature (450 °C). The fabricated films have low resistivity (4.13 × 10 –8 Ω·m), which is similar with that of bulk Au films (2.4 × 10 –8 Ω·m) and show great adhesion on glass substrates. Film porosity is extremely low, with a maximum transmittance of only 0.1% in the wavelength range of 340 nm-870 nm. The Au–Ag nanoparticles sintering behavior was also characterized systematically by both scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was observed that the sintering process could be divided into three stages. This work indicates that this preparation approach of conductive film shows potential in the fabrication of highly integrated electronic devices by ink printing method.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Bo Li,Haocheng Yang,Hongli Song,Jie Zou,Chenchen Li,Ziyi Yan,Moyuan Qu,Wenqian Xiao,Songsong Zhu,Xiaoling Liao
Repairing bone defects is particularly challenging when an infection is presented. In this study, poly(L-lactic) (PLLA) nanofibrous microspheres (large microspheres) were used as cell carriers to simulate the nanofibrous structure of the extracellular matrix. A planet-satellite composite microsphere with large microspheres and small microspheres was constructed by bonding hollow Ag@SiO 2 nanospheres (small microspheres) to nanofibrous PLLA microspheres. According to the results, PLLA nanofibrous microspheres activated by EDC and NHS can firmly combine with Ag@SiO 2 nanospheres. The composite microspheres demonstrated excellent drug release functions, antibacterial properties, and biocompatibility and promoted cell adhesion and differentiation in vitro. The bone repair function of composite microspheres loaded with BMP2 growth factor was evaluated in rat that were infected with bacteria and exhibited skull defects. A four-week study showed that these microspheres significantly promoted bone regeneration in infected bone. These multifunctional microspheres could revolutionize bone repair and provide a much-needed solution for those suffering from infected bone defects.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 9
·096514
·
IF 4.386
Zhijie Pan,Pengwei Huang,Yuanming Zhang,Xionghui Fu,Yi Zhu
Photoelectrocatalytic methanol oxidation to formaldehyde by using electric/solar energy is a promising technology. In this work, Ag nanoparticles were decorated on Mo-doped BiVO4 to synthesize Ag/Mo: BiVO4 catalyst. As expected, benefitting from Mo-dopant and plasmonic effect of Ag nanoparticles, formaldehyde production of Ag/Mo: BiVO4 photoanode was 2.2 times higher than pristine BiVO4 photoanode. Faradaic efficiency increased from 19% to 49% in comparison with the pure BiVO4 photoanode.
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高影响因子
危险品化学品经营许可证（带存储）