INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Xiaojie Song,Xiufang Wang,Weiwei Dong,Qishu Qu,Haichen Wang,Fan Yang
Solar-to-chemical energy conversion via heterogeneous photocatalysis is one of the effective approaches to tackle the growing environmental and energy challenges. Homogeneously dispersed silver nanoparticles (Ag NPs) and cadmium sulfide nanoparticles (CdS NPs) with average particle size not>20 nm were fabricated on the surface of titanium dioxide nanotubes (TNTs) (Ag/CdS/TNTs) with the help of sodium dodecyl benzene sulfonate (SDBS). Herein, more surface active sites are created on the surface of nanocomposites. The experimental results demonstrate that the photocurrent intensity of the nanocomposites obviously increased, which effectively improves the photocatalytic activity. The results of photocatalytic experiments indicated that using triethanolamine (TEOA) and acetonitrile (MeCN) as sacrificial agents, the nanocomposites afford the CO yield from CO 2 (1455.6 μmol‧g −1 ‧h −1 ). Besides, Ag/CdS/TNTs nanocomposites displayed the H 2 evolution rate of 3700.57 μmol‧g −1 ‧h −1 , which was twice as much as pure TiO 2 NPs. The increase in the photocatalytic ability of the nanocomposites is basically attributed to the three materials formation S-scheme heterojunction which reduce the recombination probability of the photo-induced electrons and holes and thus enhances the photocatalytic activitys. Ultimately, a photocatalytic reaction mechanism is proposed for Ag/CdS/TNTs nanocomposites in the reduction of CO 2 .
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yishu Qiu,Zheng Hu,Hui Li,Qianqian Ren,Yanan Chen,Shi Hu
The commercial catalysts for oxygen reduction reaction (ORR) are highly dependent on the scarce and expensive Pt to achieve high activity and reasonable durability, especially for the fuel cells used in automobiles. Ag alloys have been proposed as promising candidates for non-Pt ORR catalysts in alkaline media, with reasonably high activity at significantly lower cost. Herein we demonstrate the synthesis of Ag/Co/C hybrid electrocatalyst for ORR via radiative flash Joule heating. Unlike the previously reported solid-solution structure of the quenched immiscible alloys by flash Joule heating, the large immiscibility gap in the liquid state of the Ag-Co alloy prevents the formation of solid solution. The hybrid catalyst exhibits a specific activity 40 times and a mass activity 52 times higher than that of the pristine Ag/C at 0.8 V vs. RHE in alkaline media, and its tolerance to methanol and ethanol is superior to that of commercial Pt/C. The enhanced activity and good stability are attributed to the enhanced oxygen adsorption energy on silver due to the strong interaction between silver and cobalt.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Mingqian Wang,Ying Liang,Zhicheng Zhang,Guohong Ren,Yajun Liu,Shishan Wu,Jian Shen
Novel multifunctional core-shell nanoparticles (NPs) have attracted widespread attention due to their easy-to-modify surface properties and abundant functional groups. This study introduces a facile approach to synthesize Ag@ iron oxide (Fe 3 O 4 ) @C NPs, and modify with amino-poly (ethylene glycol) (PEG)-carboxyl and folate (FA) on the exposed carbon surface to produce high contrast for excellent stability, good biocompatibility, cancer cell targeting, and synergistic treatment. The multi-armed PEG at the edge of Ag@Fe 3 O 4 @C NPs provides the materials an excellent capacity for doxorubicin (DOX) loading. The carbon layer could be used as a photothermal reagent due to its excellent near-infrared (NIR) absorbance capacity, and Fe 3 O 4 was used as a reagent for magnetic resonance (MR) imaging. In vivo combination therapy with this agent was administered in a mouse tumor model, and a remarkable synergistic antitumor effect that is superior to that obtained by monotherapy was achieved. Concerning these features together, these unique multifunctional Ag@Fe 3 O 4 @C-PEG-FA/DOX NPs could be regarded as an attractive nanoplatforms for chemo-photothermal synergistic tumor therapy with dual-modal fluorescence and MR imaging-guided targeting.
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PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 19
·3351
·
IF 5.719
Xingwang Shen,Junjie Li,Shuang Xi
Sintered silver (Ag) die-attach has attracted much attention in power systems with high power density and high operating temperature. In this paper, we proposed a novel surface modification method for Ag nanoparticles with organic amines as a coating agent for enhancing the pressureless sintering performance. This work systematically introduced the Ag nanoparticle modification process, Ag paste preparation, and sintering process and compared the changes in the sintering performance of Ag nanoparticles after modification with four different alkyl chain lengths of amines. The study showed that the sintered films of Ag nanoparticle pastes modified withn-octylamine (NOA) can achieve the lowest resistivity of the sintered film and the highest shear strength of the bonded joints. The resistivity of the sintered Ag film is affected by the grain size and microscopic morphology, and the strength of the bonded joints is also related to the sintering density and the amount of organic residues. The thermal behavior of the Ag particles coated with different amines is measured by thermal analysis. Finally, the mechanism of NOA-modified Ag nanoparticles to improve the sintering performance is proposed. This study can provide effective data and theoretical support for the further promotion and application of nano-Ag pressureless sintering.Keywords:Ag nanoparticle paste;pressureless sintering;surface modification;high-strength joint;die-attach
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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Chongyang Hao,Lina Chen,Yamin Zhang,Xiaowen Zheng,Linna Dai,Lijie Ci
Cations preintercalation is an effective way to optimize the crystal structure and improve the electrochemical behavior. An Ag + pre-intercalated Ag x MnO 2 material with ultrafine nanowire structure is prepared by a facile hydrothermal method . With optimized crystalline microstructure including expanded interlayer space and introduced multivalence of Mn, the as-prepared material exhibits superior performance as cathode for both Li-ion and Na-ion hybrid supercapacitors (HSCs). High specific capacitance of 424.7 F g −1 in Li 2 SO 4 electrolyte and 450.1 F g −1 in Na 2 SO 4 system are achieved. The assembled HSCs using Ag x MnO 2 and activated carbon (YEC-8A) as electrode materials deliver a wide operation potential window of 0–2.2 V and a high energy density of 204.30 Wh kg −1 at the power density of 167.15 W kg −1 for Li-ion HSCs and 131.08 Wh kg −1 at 107.25 W kg −1 for Na-ion HSCs. Furthermore, the as-fabricated HSCs deliver excellent cyclic stability. The capacitance retention is 79.4% after 20,000 cycles for Li-ion HSC and 84.9% after 10,000 cycles for Na-ion HCS .
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CELLULOSE
·
2022
·Vol. 29
·期 4
·2289-2304
·
IF 6.123
Shi Chun,Zhang Lili,Shi Zhengjun,Zai Zhenqiang,Ma Jinxia,Wang Zhiguo
Ag–ZnO/cellulose nanocomposites with an all-weather photocatalytic performance that responds to all light conditions (including ultraviolet light, visible light, and even darkness) were fabricated by adjusting the surface groups and aspect ratios of the cellulose nanofiber substrate. The cellulose nanofibers improved the dispersibility and photostability of the Ag–ZnO nanoparticles (NPs), thereby enhancing the photocatalytic activity. The morphologies and sizes of the ZnO and Ag NPs within the Ag–ZnO/cellulose nanocomposites were controlled by using cellulose nanofibers with different surface groups and aspect ratios. ZnO NPs with average diameters of 250, 500, and 100 nm were synthesized in situ using cellulose nanocrystals (CNCs), cellulose nanofibrils (CNFs), and TEMPO-mediated oxidized cellulose nanofibrils (TOCNFs), respectively. The Ag–ZnO/TOCNF nanocomposites exhibited excellent all-weather photocatalytic performance, high loading amounts, and large effective contact area with pollutants. Free radical trapping experiments demonstrated that ·OH had the most significant effect on the photocatalytic activity. The photocatalytic activity of the Ag–ZnO/TOCNF nanocomposites was improved by preventing the recombination of electrons and holes and increasing the contact area with pollutants and light. The photogenerated electrons stored on the surface of the ZnO NPs and Ag NPs were further used for reducing H 2 O 2 to generate ·OH free radicals in the dark, which continued to catalyze the degradation of pollutants without light irradiation. Moreover, the photocatalytic degradation of methyl orange to CO 2 and H 2 O was confirmed via a catalytic mechanism and liquid chromatography–mass spectrometry.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Qiao Huang,Wenya Chen,Xiaojuan Liang,Chunyan Lv,Weidong Xiang
All-inorganic perovskite CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have generated significant attention in the emerging display industry because of their narrow-band emission, high color purity, and facile preparation and processing. By controlling the deposition of Ag nanoparticles in the B–Si–Zn glass matrix, CsPbBrI2 NC glass with significantly enhanced photoluminescence (PL) intensity (about 6.3 times) was successfully prepared, and the photoluminescence quantum yield (PLQY) is increased from 12.4% to 36.9%. More meaningfully, the high-performance glass powders were incorporated into polystyrene (PS) films through solution and blending techniques, and the films prepared by the latter had superior color coordinates and environmental stability, particularly the intense blue light stability. Under conditions of 60 °C, 90% relative humidity (RH), and 10 000 nit blue light irradiation for 40 d, the PL intensity decline rate of blended film does not exceed 5%. In addition, the light conversion film based on Ag@CsPbBrI2 glass with CsPbBr3 glass powders exhibits a wide color gamut of 125.2% of the NTSC 1953 standard, which shows richer colors than commercial displays on the liquid crystal display (LCD) screen, further opening the space for the development of the quantum dot film industry.
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ACS ES&T Water
·
2021
·
IF 0
Ming Yi,Lian Tian,Yafang Liu,Liang Shen,Chun Ding,Tengyang Zhu,Xi Yu,Yan Wang
As an ideal membrane for wastewater treatment, desirable separation performance, and fouling resistance are both requisite. Herein we directly in situ attached Ag based nanoparticles on the surface of thin-film composite polyamide (TFC PA) membranes by using benzenediamine (BDA) derivatives with acid functional groups as one aqueous monomer mixed with m-phenylenediamine (MPD) for interfacial polymerization (IP). The acid functional groups in BDA derivatives incorporated in the PA layer facilitated the in situ metallization or mineralization without grafting additional “bridge” linkers. Various characterization techniques were employed to elucidate the modification mechanism. The effects of molecular structures of BDA derivatives on the surface properties, separation performance, and antifouling capacity of resulting membranes were also systematically investigated. Compared with the pristine TFC membrane, the modified membranes exhibited the 85.83% water flux enhancement and 65.25% lower reverse salt flux overcoming the permeability-selectivity trade-off. Moreover, the total Ag loading of modified membranes increases by 8–14 times as compared to that of the pristine one, thereby the enhanced antibacterial and antifouling capacities in wastewater treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Guannan Yang,Pengyu Wang,Yu Liu,Shuzhou Lu,Bo Luo,Tao Lai,Shiwo Ta,Tingyu Lin,Jiye Luo,Yu Zhang,Chengqiang Cui
Ag-coated Cu particles (Cu@Ag particles) are highly anticipated bimetallic materials with wide electronic applications. However, it is still crucially challenging to obtain well-covered Ag shells and facilitate the synthetic process, and the sintering/migration behaviors of Cu@Ag particles are also poorly understood. In this study, we develop a facile Ag coating method for Cu@Ag particles with the assistance of double complexing agents. Electrochemical analysis reveals that the complexing effect can effectively reduce the potential difference of the Cu-Ag replacement reaction, and thereby improve the coating quality. Cu@Ag particles with compact and uniform Ag shells are obtained, with Ag contents as low as ~10 at%. The as-prepared Cu@Ag particles show significantly improved oxidation resistance and reliable sintering property. Moreover, the Cu@Ag particles exhibit superior ion migration resistance even better than both Cu and Ag particles under an oxygen-containing environment. The results could provide helpful basis for understanding the synthesis, sintering and migration processes of Cu@Ag particles. The comprehensive performance of Cu@Ag particles makes them a promising interconnected material in future electronic industry.
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RSC Advances
·
2021
·Vol. 11
·期 26
·15959-15968
·
IF 3.361
Guozheng Zhao,Hui Liang,Hongzhu Xu,Changbo Li,Qingwei Tan,Daihang Zhang
Ordered mesoporous Ag/CeO2 catalysts have been successfully synthesized by a microwave assisted soft template method. The morphology, structure and chemical composition of the catalyst were characterized by XRD, N2 adsorption–desorption, SEM, EDS, TEM and XPS. The study of catalytic performance and reaction kinetics of organic matter degradation in acrylonitrile wastewater was performed in a catalytic wet peroxide (CWPO) system. The degradation pathways of organic matter in acrylonitrile wastewater were elucidated by temporal evolution of intermediates and final products detected by GC/MS analysis along with a continuous flow experiment study. The results show that the Ag/CeO2 has an ordered mesoporous structure, the specific surface area is 91.4–118.2 m2 g−1 and the average pore size is 12.63–16.86 nm. 0.4-Ag/CeO2 showed the best catalytic performance, the COD removal rate reached 94.6%, which was 30% higher than that of CeO2. The degradation is in accordance with the second-order reaction kinetics of the Arrhenius empirical model and Langmuir–Hinshelwood kinetic model. However the latter fits better, and the linear correlation coefficient R2 is more than 0.98, which describes the adsorption catalytic mechanism of Ag/CeO2. According to the analysis by GC/MS, the organic compounds in acrylonitrile wastewater oxidized into intermediate compounds and other small compounds, then are further oxidized into carbon dioxide and water. The catalytic activity of Ag/CeO2 was the result of the combination of Lewis acid–base position of CeO2 and redox cycle of Ce3+/Ce4+.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 26
·6371-6379
·
IF 5.066
Shuyuan Cui,Zhigao Dai,Qingyong Tian,Jun Liu,Xiangheng Xiao,Changzhong Jiang,Wei Wu,Vellaisamy A. L. Roy
Three-dimensional (3D) ZnO/Ag nanowire arrays (NWA) SERS substrates are fabricated by a screen-printing technique. The preparation of patterned ZnO NWA involves a two-step growth process. The ZnO nanoparticles-based ink is prepared and printed as seed layers, which are used as templates to fabricate patterned ZnO NWA via a hydrothermal method. During the screen printing process, the patterns of ZnO NWA are controlled by printing plates. The as-obtained NWA with uniform morphology was fabricated at 90 °C and exhibits hydrophilic and lipophilic properties. Subsequently, the sensitive 3D SERS substrates are fabricated through deposition of Ag nanoparticles (NPs) onto the surface of patterned ZnO NWA by magnetron sputtering. The detection limit of Malachite green (MG) can achieve 10−12 M with an enhancement factor of about 2.5 × 1010. Combined with the sensitivity and uniformity, the ZnO/Ag NWA is applied for the quick detection of low concentrations of molecules related to food safety, such as amoxicillin.
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Advanced Electronic Materials
·
2018
·Vol. 5
·期 1
·1800548
·
IF 5.466
Changzeng Yan,Tianhang Yu,Chao Ji,Dae Joon Kang,Ning Wang,Rong Sun,Ching-Ping Wong
Ever-increasing packaging and power densities of modern electronic devices in the present “More-than-Moore” technology era demand higher performance thermal interface materials (TIMs). However, conventional composite TIMs require higher loading to achieve better thermal conductive property, resulting in a mechanical problem. The poor wetting property of matrix loading materials further increases the interfacial thermal resistance (ITR). In this work, a one-step hydrothermal method is employed to grow 2D molybdenum disulfide (MoS 2 ) nanosheets on a tellurium (Te) nanowire skeleton and silver (Ag) nanoparticles are further decorated on MoS 2 nanosheets via the photoreduction method. The in-plane thermal conductivity of the final nanocomposite reaches as high as 10.4 W m −1 K −1 , which is 4,160% higher than that of a pure epoxy resin and one order of magnitude higher than that of conventional polymeric nanocomposites. The 3D interconnected heat transferring network of Te/MoS 2 /Ag greatly enhances the thermal stability of the composite in practical applications. The rational materials design concept may contribute to the development of new types of high-performance thermal management materials.
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