Micromachines
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2023
·Vol. 14
·期 10
·
IF 3.4
Yongjun Zhang,Zhen Xu,Jiahong Wen,Xiaoyu Zhao,Renxian Gao,Yaxin Wang
Organized two-dimensional polystyrene bead arrays perform ion etching, and protruding nanostructures are created on polystyrene beads due to the shadow effects from the ring beads, leading to nucleus selection and growth in Au nanostructure deposition. Ag nanostructures are prepared via plasmon-mediated chemical reactions (PMCRs), leading to the Ag nanocavity geometry of the honeycomb pattern when the etching time and Ag growth time are tuned. Due to the strong electromagnetic coupling, the Ag honeycomb-shaped nanocavity array works as the SERS substrate with high sensitivity and good repeatability, which is used to detect thiram pesticide residues with a concentration down to 10−9M.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
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2026
·
IF 5.1
Jian Liu,Jianyi Song,Na Liu,Qiao Lan
A pump-free, stable and efficient aerogel reactor with abundant pores is designed using Ag-loading cellulose Pickering emulsions as a template for the continuous flow catalytic reduction of 4-nitrophenol. The fabrication of the aerogel reactor entails the two-step oxidation synthesis of aldehyde-functionalized cellulose nanocrystals (ACNC), the in-situ reduction of Ag nanoparticles (NPs) on them to form Ag@ACNC, the utilization of this material to stabilize a Pickering emulsion for preparing the hydrogel, and finally the freeze-drying of the hydrogel laying on a fabric strip. The emulsion-templated aerogel features abundant pores with loading Ag NPs on inner walls, enabling reactant to flow through the pores rapidly under driving by its gravity and the capillary action of the supporting fabric strip and react on the walls. The aerogel reactor achieves efficient three-dimensional flow catalysis without an external power source and exhibits excellent conversion and stability. The conversion all remains above 91.8% during the continuous flow catalysis reaction of 6 cycles (totaling 72 h), and the conversion still reaches 94.4% at 12 h after storage in air for 60 days. This emulsion-templated aerogel reactor demonstrates great potential for advancing recyclable catalytic systems, thereby paving the way for its wide applications.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Qiongqiong Lu,Congcong Liu,Yehong Du,Xinyu Wang,Ling Ding,Ahmad Omar,Daria Mikhailova
Aqueous zinc-ion batteries (ZIBs) are considered as a promising energy storage system due to their low cost and high safety merits. However, they suffer from the challenge of uncontrollable dendrite growth due to a non-uniform zinc deposition, which increases internal resistance and causes battery failure. Herein, Ag coating fabricated by a facile surface chemistry route on zinc metal was developed to guide uniform zinc deposition. Ag-coated Zn shows improved electrolyte wettability, a small zinc deposition overpotential, and fast kinetics for zinc deposition/dissolution. Direct optical visualization and scanning electron microscopy images show uniform zinc deposition due to the introduction of Ag coating. As a result, the Ag-coated Zn anode can sustain up to 1450 h of repeated plating/stripping with a low overpotential in symmetric cells at a current density of 0.2 mA cm–2, while an improved performance is realized for full cells paired with a V2O5-based cathode. This work provides a facile and effective approach to improve the electrochemical performance of ZIBs.
研究领域:
储能
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电化学
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材料科学
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电池技术
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ziwei Yue,Xiaoliang Ji,Wei Zhou,Zhihao Ji,Fu Guo
Due to a lower intrinsic thermal conductivity , Cu 2 S-based thermoelectric materials are attracting extensive attention. However, they still confront the problem of higher electrical resistivity, which distinctly restricts their thermoelectric application. Herein, we synthesized Ag-incorporated Cu 2-x S micro/nano composites using a hydrothermal method . It was found that the doping of Ag nanoparticles could effectively enhance the electrical transport, while the generated nanopores , caused by the sintering of Ag nanoparticles during the SPS process, reduced the thermal conductivity. As a result, a maximum ZT value of ∼1.5 was obtained at 773 K in the Cu 2-x Ag δ S (δ = 0.5%) micro/nano composites, much higher than that of the pristine Cu 2-x S micro/nano composites. This work provides a new pathway to boosting thermoelectric performance through microstructural engineering.
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Chemosensors
·
2022
·Vol. 10
·期 12
·539
·
IF 4.229
Linfan Guo,Haibin Tang,Xiujuan Wang,Yupeng Yuan,Chuhong Zhu
Porous noble metal nanomaterials can be employed to construct sensitive surface-enhanced Raman scattering (SERS) substrates, because the plasmonic nanopores and nanogaps of the porous materials can provide a larger number of hotspots, and can also serve as containers of analyte molecules. However, the fabrication processes of nanoporous noble metal are generally complicated. Here, a facile method is presented to prepare nanoporous Ag nanoparticles-decorated Ag7O8NO3micro-pyramids, which are fabricated through the chemical reduction of the electrodeposited Ag7O8NO3micro-pyramids using NaBH4. The Ag7O8NO3micro-pyramids are fabricated by electrodeposition by using a simple aqueous solution of AgNO3as electrolyte. Then, porous Ag-decorated Ag7O8NO3micro-pyramids are achieved by the chemical reduction of the surface of the electrodeposited Ag7O8NO3micro-pyramids with NaBH4. The high-density nanopores and nanogaps of the fabricated nanoporous Ag can provide plenty of hot spots for Raman enhancement. Additionally, the nanopores have an effective capacity to trap and enrich analytes. Using rhodamine 6G (R6G) as a probe molecule, the SERS performance of the fabricated SERS substrate has been investigated. It is found that a limit of detection (LOD) ~1.0 × 10−15M can be achieved for R6G. Then, the SERS substrates are employed to detect dye molecule (crystal violet) and pesticide (thiram), and their LODs are calculated down to 9.6 × 10−13M and 1.3 × 10−15M, respectively. The enhancement factor of the fabricated SERS substrate is estimated to be as high as 5.6 × 108. Therefore, the nanoporous Ag-decorated Ag7O8NO3micro-pyramids have shown promising application in the sensitive SERS detection of organic molecules.Keywords:surface-enhanced Raman scattering;detection;porous silver;pesticide;chemical reduction
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CLAYS AND CLAY MINERALS
·
2023
·Vol. 70
·期 6
·809-823
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IF 2.2
He Qiuzhi,Chen Qingze,Zhu Runliang,Du Jing,He Shiya,Lv Guocheng,Gu Cheng,Wang Aiqin
Supported silver nanoparticles (Ag NPs) have been used extensively as antibacterial agents in biomedicine, biotechnology, and environmental remediation. However, a facile and scalable method for preparing Ag NPs dispersed homogeneously on supports remains a challenge. In this study, a novel molten salt method was developed successfully to synthesize the supported, homogeneously dispersed Ag NPs on palygorskite. Abundant pores and ample surface hydroxyl groups of palygorskite served as anchoring sites, preventing the rapid growth, aggregation, and sintering of Ag NPs. Typically, palygorskite was mixed with AgNO 3 (as a precursor) and NaNO 3 (as a dispersant), and then the mixture was heated slowly. During the heating process, the AgNO 3 decomposed gradually into Ag NPs and the molten NaNO 3 with a high concentration of ions dispersed the newly formed Ag NPs. The Ag NPs were dispersed homogeneously on the palygorskite and had very small particle sizes (~5.8 nm) even for a significant loading amount (~9 wt.%). As antibacterial agents, the Ag/palygorskite nanocomposites showed enhanced antibacterial activity, compared with those synthesized without the introduction of molten NaNO 3 . In addition, the key effect of the surface hydroxyl groups of palygorskite on the characteristics of the loaded Ag and the corresponding antibacterial activity were also elucidated. As such, the present work provided a novel and facile strategy for the synthesis, without a chemical reductant or surfactant, of supported, highly dispersed Ag NPs on clay minerals and this could have potential in the scalable production and practical application of Ag-based antibacterial materials.
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Journal of Water Process Engineering
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2022
·
IF 7.34
Pan Wang,Mengxue Wang,Tao Song,Jiaqi Chen,Xidi Liu,Xiaoyang Liu,Yong You,Huijin Song,Kui Li,Ying Li,Wei Feng,Xulin Yang
Separating of oil-water emulsions under harsh conditions is a major challenge for membrane-based filtration systems. In this study, a well-stabilized electrospinning nanofibrous membrane was successfully fabricated by combining a high-performance engineering polyarylene ether nitrile (PEN) with polydopamine (PDA), and silver nanoparticles (Ag NPs). The employed PEN has comprehensive performance in thermoresistant, anti-corrode and mechanical properties, which was expected to be a robust polymer matrix. Ag NPs were loaded on PEN electrospinning nanofibrous membranes via PDA coating and in situ growth. Morphological measurements revealed a hierarchical structure of fabricated Ag@PDA/PEN membrane with Ag NPs formed in situ covered on the surface. The particle size of Ag NPs was mainly in the range of 50–85 nm and the diameter of PEN fiber was located at∼0.39 μm. The water contact angle (CA) of membranes increased from 30 o to 130 o by the increasing Ag NPs formation. As a result, the prepared composite membranes reached 4978.71 L/m 2 h and 99 % for permeate flux and good retention rate for oil-water emulsion separation, respectively. Moreover, the high-performance PEN further endowed the tough stability and durability of the obtained composite membranes, which can tolerate corrosive emulsions, resist high temperatures, and maintain a high separation efficiency after cycle reuse. Furthermore, the as-prepared membranes demonstrated excellent anti-bacterial properties (>99.99 %) inherited from the introduction of Ag NPs. Therefore, the comprehensive anti-corrode, anti-heat, and anti-bacterial performance provide the fabricated robust Ag@PDA/PEN electrospinning nanofibrous membrane a broad prospect for purifying water resources, especially industrial wastewater treatment under harsh conditions.
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Nanomaterials
·
2022
·Vol. 12
·期 23
·4238
·
IF 5.719
Wenhang Wu,Zheng Liang,Meng Jia,Yuwei Li,Xiongcong Guan,Yunfeng Zhan,Jinxiu Wen,Jianyi Luo
A flexible thermoelectric device has been considered as a competitive candidate for powering wearable electronics. Here, we fabricated an n-type Ag2Se/Ag composite film on a flexible nylon substrate using vacuum-assisted filtration and a combination of cold and hot pressing. By optimising the Ag/Se ratio and the sequential addition and reaction time of AA, an excellent power factor of 2277.3 μW∙m−1K−2(corresponding to aZTof ~0.71) at room temperature was achieved. In addition, the Ag2Se/Ag composite film exhibits remarkable flexibility, with only 4% loss and 10% loss in electrical conductivity after being bent around a rod of 4 mm radius for 1000 cycles and 2000 cycles, respectively. A seven-leg flexible thermoelectric device assembled with the optimised film demonstrates a voltage of 19 mV and a maximum power output of 3.48 μW (corresponding power density of 35.5 W m−2) at a temperature difference of 30 K. This study provides a potential path to design improved flexible TE devices.Keywords:thermoelectricity;Ag2Se;Ag;composite film;flexible device
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PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 1
·101-119
·
IF 3.134
Chen Fenghua,Yang Maosen,Shi Xiangdong,Qin Xiaoyun,Chen Qingtao,Jiang Liying,Jia Chunxiao
In order to increase the photocatalytic performance of titanium dioxide mesocrystals (TMCs), in this study, Ag nanoparticles with different mass content were first photodeposited on the surface of as-prepared TMCs to form heterostructured Ag–TMCs catalysts, followed by loading them on g-C 3 N 4 via one step “bottom-to-up” calcination method. The results of photocatalytic degradation toward RhB experiments showed that the prepared ternary photocatalyst of g-C 3 N 4 /Ag–TMCs exhibited excellent photocatalytic activity not only compared with the bare TMCs and Ag–TMCs, but also with all of those reported TiO 2 /Ag/g-C 3 N 4 ternary photocatalysts. Such improved photocatalytic properties were attributed to the synergistic effect created by the LSPR effect and an important role as an electron-conduction bridge of Ag and the existence of heterojunction structure formed between Ag, TMCs and the further coupling g-C 3 N 4 , which added to the evidences that enabled the prepared g-C 3 N 4 /Ag–TMCs catalyst enhanced transfer efficiency of photogenerated carriers and suppressed recombination rate of electron-hole pairs. Moreover, the deposited Ag content had a positive effect on the photocatalytic degradation efficiency. On the basis of the results of this study, the specimen of g-C 3 N 4 /9% Ag–TMCs showed RhB degradation efficiency up to 100% under only 15 min visible-light irradiation. A possible degradation mechanism was also proposed based on several characterizations including photoluminescence spectrum and a serious of photoelectrochemical measurements. Overall, the prepared g-C 3 N 4 /Ag–TMCs ternary photocatalyst with good recyclability looked promising for future practical applications in the visible-light photodegradation of organic pollutants.
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Journal of Energetic Materials
·
2022
·
IF 2.421
Xiaopeng Zhang,Yige Wu,Pengcheng Wang,Qiuhan Lin,Shusen Chen,Shaohua Jin,Yuangang Xu,Ming Lu
As a new structural motif, an interesting 3D energetic metal – framework of silver ions and 3,4-diaminofurazan, [Ag+(daf)NO3−]n, is successfully synthesized and the structure is determined by single-crystal X-ray diffraction. The effects of hydrogen bond, coordination bond, adsorption and filling interactions make this compound have a high density (2.694 g·cm−3 at 293 K). The calculated detonation velocity and the sensitivities are all comparable with trinitrotoluene (TNT). The onset decomposition temperature is equal to hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), state-of-the-art explosive. This framework provides a potential superiority of E-MOFs for energetic materials.
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FUEL
·
2022
·
IF 8.035
Lihong Guo,Wenlei Xie,Chunli Gao
The heterogenization of Keggin-structure heteropoly acids (HPAs) has been proposed as a strategy to improve their application in biodiesel production in an attempt to comply the green and clean production demand. Herein, the commercial activated carbon (AC) was firstly modified with different metal ions (Cs + , K + and Ag + ), and then the H 6 PV 3 MoW 8 O 40 acid was incorporated into as-modified AC supports, so as to prepare HPAs-based solid catalysts. By screening tests, the 35%H 6 PV 3 MoW 8 O 40 /AC-Ag hybrid solid catalyst showed highly catalytic performance for transesterification of soybean oil. The best oil conversion of 91.3% was achieved under optimized conditions: methanol/oil molar ratio of 30:1, reaction time of 10 h, reaction temperature of 140 °C and catalyst dosage of 8 wt.%. Characterization results of XRD, IR, ICP and TG indicated that H 6 PV 3 MoW 8 O 40 was highly dispersed on the AC-Ag support as the loading was less than 35%. Proton exchange with Ag may contribute to the highly dispersion of H 6 PV 3 MoW 8 O 40 on the support and thus enhance the interaction of the heteropoly acids with the support, thereof leading to the increased catalytic stability. The as-prepared 35%H 6 PV 3 MoW 8 O 40 /AC-Ag catalyst was easily recycled and had good resistance to free fatty acid (FFA) and water, which were usually included in the low-quality oils. Moreover, as a bifunctional catalyst, the solid acid catalyst could simultaneously catalyze the transesterification of soybean oil and esterification of FFAs, and a probable mechanism of the catalytic process was also proposed. All the features of this novel solid catalyst are more advantageous than the homogenous H 6 PV 3 MoW 8 O 40 catalyst, successfully creating an efficient and sustainable approach of biodiesel production especially from the low-quality oils.
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高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 11
·2102245
·
IF 6.389
Jingxian Sun,Yixin Yuan,Guoqiang Lu,Tanlong Xue,Jun Nie,Yan Lu
Recently, flexible strain sensors have been intensively studied in order to meet the growing demands of detecting multiscale mechanical deformations. However, it remains a big challenge to integrate high stretchability and high sensitivity in a strain sensor simultaneously. In this study, a highly stretchable and sensitive strain sensor is successfully fabricated by constructing ionogel/silver synergistic conductive network. The transmetalation reaction is utilized to transform the copper atoms in the copper/ionogel nanocomposite into more silver atoms with larger radius, which eliminates the interspace among the nanoparticles, and therefore a silver/ionogel nanocomposite with high conductivity is obtained. Owing to the fragility of the conductive network, the obtained nanocomposite possesses high sensitivity. In addition, as the polymer substrate, the conductive ionogel can connect the crack of the silver conductive network during stretching, endowing the nanocomposite with high stretchability. Hence, the obtained strain sensor exhibits a high sensitivity in a wide sensing range and can detect various human activities. Therefore, this strategy can be envisioned as promising strategy for fabricating high-performance strain sensors and other flexible electronics.
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