CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Jin-Qi Xie,Jing Tian,Lingjie Mao,Humeizi Cao,Binbin Zhou,Lang Shi,Sanying Hou,Yaqiang Ji,Xian-Zhu Fu
Additive strategy has been regarded as a promising approach for fabricating electronic copper patterns, since it has predominance over traditional lithography technology (subtractive strategy) in process simplicity, material economizing, and environmental protection. At present, the key challenge for additive strategy is how to precisely fabricate high-quality copper patterns adhering tightly to substrates, by facile and universally applicable process. Here a novel additive copper patterning process is explored by adopting a homogeneous Ag-based catalyst ink. The catalyst ink can be facilely patterned and tightly attached on various substrates by different patterning techniques, without any pre- and post-treatment procedures. In the catalyst ink formula, epoxy matrix contributes high adhesiveness and fixes ink form, valen Schiff base acts as a medium anchoring Ag catalyst, ethanol serves as both reductant and diluent, and polyethylene glycol improves hydrophility. The copper coating, forming on the catalyst layer by further electroless copper deposition process, exhibits compact structure and high electrical conductivity comparable to bulk copper. Moreover, the copper coating can be partially inserted into substrate body by porous surface design for substrates, thus achieving strong adhesion and high flexibility. This research contributes to the progress of next-generation copper patterning techniques.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Peifang Chen,Caiyun Jiang,Zhouping Wang,Hong-zhen Lian,Xiaoyuan Ma
As a virulent metabolite, aflatoxin B 1 (AFB 1 ) presented in various cereal grain is tightly implicated in severe human diseases. In this study, 3D plasmonic nanohybirds of Raman molecule 4-mercaptobenzoic acid (4-MBA)-embedded and AFB 1 aptamer-modified bimetallic nanostars as SERS probes bound to magnetic nanoflowers were fabricated and demonstrated as a high-performance SERS-active aptasensor to quantitatively analyze AFB 1 . Bimetallic Au@Ag SERS plasmonic nanoprobes with enhanced properties were capable of enhancing discriminative Raman peaks of 4-MBA. Then, the integration of iron tetroxide nanoparticles (Fe 3 O 4 NPs) and molybdenum disulfide nanosheets (MoS 2 NShs) with huge specific surface area constituted stable 3D Fe 3 O 4 @MoS 2 plasmonic nanoflowers, facilitating the bind of numerous aptamer-based SERS probes via the non-covalent interaction between MoS 2 NShs and aptamer, which were ideal candidates for SERS-active substrates. Additionally, Fe 3 O 4 NPs as magnetic core endowed 3D nanocomposites with specific magnetic separation characteristic that caused the collected SERS hotspots to exhibit superior signal response, and further strengthening the sensitivity in a complex food matrix. Aptamer-target AFB 1 specific recognition triggered linearly diminished 4-MBA signal intensity (I 4-MBA ) on the substrate to achieve a low detection limit of 58.9 pg/mL. Furthermore, the sensor has the potential to be a promising monitoring tool for other trace contaminants.
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RSC Advances
·
2023
·Vol. 13
·期 39
·27203-27211
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IF 3.9
Jiaxin Xiao,Shumin Zhu,Lingjun Bu,Yuan Chen,Ruoxi Wu,Shiqing Zhou
Halonitrophenols (HNPs) are an emerging type of aromatic disinfection byproduct, with detected concentrations of ∼nmol L−1 in source water and drinking water. Currently, there are no standard methods for identifying HNPs, and most of the reported methods are time-consuming and equipment-dependent. A core–shell metal–organic framework (MOF) based electrochemical sensor (Ag/ZIF-8@ZIF-67) capable of detecting 2,6-dichloro-4-nitrophenol (2,6-DCNP) is reported in this study. The electrochemical sensor obtains the concentration of 2,6-DCNP by detecting the peak current passing through the sensor. In this sensor, Ag nanoparticles (AgNPs) play a key role in electrochemical sensing by reducing nitro groups via electron transfer, and porous structure with a large surface area is offered by ZIF-8@ZIF-67. The cyclic voltammetry (CV) response of Ag/ZIF-8@ZIF-67 was found to be approximately 1.75 times and 2.23 times greater than that of Ag/ZIF-8 and Ag/ZIF-67, respectively, suggesting an ideal synergistic effect of the core–shell structures. The Ag/ZIF-8@ZIF-67 sensor exhibited exceptional sensitivity to 2,6-DCNP, exhibiting a broad linear response range (R2 = 0.992) from 240 nmol L−1 to 288 μmol L−1 and a low detection limit of 20 nmol L−1. Furthermore, the sensor exhibited good anti-interference for isomers and common distractors in water, excellent stability and reproducibility, and high recovery in actual water samples. Our reported sensor gives a novel strategy for sensitive, selective, and in situ detection of 2,6-DCNP in practical analysis.
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Nanomaterials
·
2020
·Vol. 10
·期 6
·1205
·
IF 4.324
Changbo Zhang,Jiying Xu,Yi Chen
Surface-enhanced Raman scattering (SERS) greatly increases the detection sensitivity of Raman scattering. However, its real applications are often degraded due to the unrepeatable preparation of SERS substrates. Herein presented is a very facile and cost-effective method to reproducibly produce a novel type of SERS substrate, a monolayer photonic crystal (PC). With a building block of laboratory-prepared monodisperse SiO2particles deposited with space-tunable silver nanobulges (SiO2@nAg), a PC substrate was first assembled at the air–water interface through needle tip flowing, then transferred onto a silicon slide by a pulling technique. The transferred monolayer PCs were characterized by SEM and AFM to have a hexagonal close-packed lattice. They could increase Raman scattering intensity by up to 2.2 × 107-fold, as tested with p-aminothiophenol. The relative standard deviations were all below 5% among different substrates or among different locations on the same substrate. The excellent reproducibility was ascribed to the highly ordered structure of PCs, while the very high sensitivity was attributed to the strong hotspot effect caused by the appropriately high density of nanobulges deposited on SiO2particles and by a closed lattice. The PC substrates were validated to be applicable to the SERS assay of trace thiol pesticides. Thiram pesticide is an example determined in apple juice samples at a concentration 102-fold lower than the food safety standard of China. This method is extendable to the analysis of other Raman-active thiol chemicals in different samples, and the substrate preparation approach can be modified for the fabrication of more PC substrates from other metallic nanobulge-deposited particles rather than silica only.Keywords:monolayer photonic crystal;silica particles;silver nanobulge deposition;SERS assay;pesticide determination
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FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Yifan Zhang,Shaole Ling,Yueqisha Chen,Xianmin Qin,Keshan Wang,Qiujin Zhu,Yuanyuan Liu
As the demand for food quality and safety continues to rise, antimicrobial active packaging materials with good mechanical and barrier properties have received urgent attention from the food industry. In this study, three types of Ag/tannic acid-Fe III ion nanocomposites (TFA) were synthesized using an in-situ method and incorporated into a chitosan/gelatin/polyvinyl alcohol complex film (CF) to produce multifunctional and highly cross-linked active films. The impact of TFA prepared through three different methods on the microstructure and functional properties of the CF were investigated. The structure of the TFA-loaded films was investigated to confirm the strong intermolecular interactions between the polymers and TFA. The TFA established multidimensional physical interactions and cross-linked the polymers, thereby enhancing the mechanical properties of the CF and providing excellent antioxidant activity and photothermal effects. Under 808 nm near-infrared laser irradiation, the TFA-loaded films displayed potent antibacterial performance against both S. aureus and E. coli bacteria. This study demonstrated that the nanocomposite prepared via ascorbic acid reduction (TFAV) given the highest comprehensive performance rating to the film. It can be utilized not only for conventional food packaging but also as a continuous sterilization strategy for meat products storage due to its photothermal antibacterial functionality.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhengdong Zhu,Konghao Han,Yating Feng,Zhihao Li,Anxin Zhang,Tao Wang,Maofeng Zhang,Wei Zhang
Microplastics are persistent pollutants that accumulate in the environment and can cause serious toxicity to mammals. At present, few technologies are able to quantitatively detect chemicals and provide morphological information simultaneously. Herein, we developed a dragonfly-wing-mimicking ZnO nanorod array decorated with AgNPs on polydimethylsiloxane (PDMS) as a surface-enhanced Raman spectroscopy (SERS) and photo-induced enhanced Raman spectroscopy (PIERS) substrate for trace analysis of microplastics. The Ag/ZnO@PDMS hybrid nanorod array endows the sensor with high sensitivity and signal repeatability (RSD ∼ 5.89%), ensuring the reliable quantitative analysis of microplastics. Importantly, when the noble metal–semiconductor substrate was pre-radiated with ultraviolet light, a surprising PIERS was attained, achieving an additional enhancement of 11.3-fold higher than the normal SERS signal. By combining the PIERS technology with the “coffee ring effect”, the sensor successfully discerned microplastics of polyethylene (PE) and polystyrene (PS) at a trace level of 25 μg/mL even with a portable Raman device. It was capable of identifying PS microspheres in contaminated tap water, lake water, river water, and seawater with detection limits of 25, 28, 35, and 60 μg/mL, respectively. The recovery rates of PS microspheres in four water environments ranged from 94.8 to 102.4%, with the RSD ranging from 2.40 to 6.81%. Moreover, quantitative and visualized detection of microplastics was readily realized by our sensor. This portable PIERS sensor represents a significant step toward the generalizability and practicality of quantitative and visual sensing technology.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Jiasheng Wang,Qingrong Wang,Mengdi Zhao,Ming Bao
Toluene gas-phase oxidation is a green, chlorine-free production process for benzaldehyde but its conversion efficiency is still unsatisfying due to the lack of highly efficient catalyst. Here the selective oxidation of toluene to benzaldehyde over V-Ag-Ce/TiO 2 under an air atmosphere was investigated. The catalyst was prepared by impregnation and characterized by scanning electron microscope (SEM), N 2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Electron paramagnetic resonance (EPR), H 2 temperature programmed reduction (H 2 -TPR), O 2 temperature programmed desorption (O 2 -TPD), and NH 3 temperature programmed desorption (NH 3 -TPD). The amount of oxygen vacancy and acid of the catalyst can be tuned through adjusting the V:Ag:Ce ratio. Over the optimum catalyst (V:Ag:Ce = 4:2:1, molar ratio), 92% benzaldehyde selectivity with a 27% toluene conversion can be obtained at 550 °C. Medium amounts of oxygen vacancy (0.43) and acidity (0.10 mmol/g) are found to be conducive to the conversion of toluene to benzaldehyde. This study has important theoretical guiding significance for improving conversion efficiency from toluene to benzaldehyde by gas-phase aerobic oxidation.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Jialin Jia,Stefanos Giannakis,Dong Li,Boyin Yan,Tao Lin
A novel catalytic system for effective photocatalytic inactivation of Escherichia coli ( E. coli ) was constructed by anchoring Ag nanoparticles (AgNPs) on silane coupling agent (SCA) pretreated TiO 2 nano-tube arrays (Ag/SCA/TiO 2 NTAs). Morphology and structural analyses revealed that SCA could disperse AgNPs evenly on TiO 2 NTAs, thus inducing a superior surface plasmon resonance (SPR) effect. Ag/SCA/TiO 2 NTAs catalyst exhibited excellent inactivation performance when in the presence of peroxymonosulfate (PMS) and visible light (VL), with 6-log E. coli was completely inactivated within 60 min, which was 5.3, 12.5 and 13.2 times higher than that of Ag/SCA/TiO 2 NTAs/VL, PMS/VL and Ag/SCA/TiO 2 NTAs/PMS/dark systems, respectively. Additionally, the photocatalyst exhibited a highly reusable property, with the inactivation performance almost unchanged after ten cycles of uses with minimal Ag leaching. The inactivation mechanism analysis demonstrated that both radical (SO 4 •- , OH) and non-radical (h + , 1 O 2 ) pathways involved in E. coli inactivation, and SCA played a pivotal role in the production of reactive species. Chloride ions (Cl − ) greatly enhanced the inactivation efficiency, while bicarbonate (HCO 3 − ) and phosphate (H 2 PO 4 − ) showed an inhibitory effect. Humic acid (HA) displayed a dual effect on inactivation performance, where the low concentration of HA facilitated the bacteria inactivation, while the higher dose suppressed bacteria inactivation. Moreover, the system exhibited excellent inactivation performance in tap water . This work first used SCA as the binder to fix AgNPs on TiO 2 NTAs for VL photocatalytic inactivation of bacteria with the assistance of PMS, which was expected to provide some insights into the practical treatment of drinking water .
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TALANTA
·
2023
·
IF 6.1
Ruizhi Li,Wenrui Zhang,Fanxing Meng,Xinbo Li,Zongda Li,Yan Fang,Minwei Zhang
Herein, the hollow Prussian blue with ultra-small silver nanoparticle agents (Ag-HPB) was prepared by the coating-etching method by applying Prussian blue (PB) coating on Ag nanoparticles (Ag NPs) and diffusing Ag NPs into the PB framework. The flexible biosensing platform based on Ag-HPB nanocomposites incorporated the excellent electrical conductivity of Ag NPs and the superior enzyme loading capacity of the hollow structure, which significantly enhanced its sensing performance. Subsequently, take glucose oxidase (GOx) and acetylcholinesterase (AChE) as examples. The sensing platform displayed a good sensitive response to glucose (Glu) (24.37 μA mM −1 cm −2 ) and a considerable limit of detection (LOD) for trichlorfon (TCF) as 2.28 pg/mL while exhibiting high stability and good reproducibility. Moreover, it can be applied to monitor trichlorfon in apple samples. Promisingly, the Ag-HPB prepared by the coating-etching strategy provides a reliable strategy for further development of sensitive and flexible biosensing platforms with excellent electrical conductivity and high enzyme loading.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-19
·
IF 2.8
Chen Haixue,Wang Xinyue,Zeng Zejun,Zhang Guoqi,Zhang Jing,Liu Pan
With the development of electronic technology towards high power, miniaturization, and system integration, power electronic packaging is facing increasing challenges, especially for die attachment. This research aims to explore silver-coated copper (Cu@Ag) paste with sufficient mechanical properties and high-temperature reliability, as an alternative solution for silver sintering with lower cost. Firstly, micro-Cu@Ag sintering pastes were investigated under four kinds of polyol-based solvent systems and two types of particle morphologies, which included sphere-type (SCu@Ag) and flake-type (FCu@Ag). Sintering performance and microstructural evolution were compared and analyzed. Notably, sintered joints employing the terpineol–polyethylene glycol solvent system and flake-type morphology displayed a denser microstructure in comparison to SCu@Ag joints. Its bonding strength reached 36.15 MPa, which was approximately 20% higher than SCu@Ag joints. Subsequently, the influence of key sintering process parameters on Cu@Ag joints was analyzed, including sintering temperature, pressure and time. Additionally, high-temperature aging and thermal cycling tests were conducted on the optimized Cu@Ag joints to assess their reliability. Finally, the micromechanical properties of Cu@Ag joints before and after high-temperature aging were further evaluated by nanoindentation including creep properties. The elastoplastic constitutive models of Cu@Ag sintered materials with different particle morphologies were constructed, providing valuable insights for reliability evaluation. The results indicated that FCu@Ag joints exhibited satisfactory creep resistance and high-temperature reliability. In conclusion, the FCu@Ag micro-paste based on the terpineol–polyethylene glycol solvent system proposed in this study demonstrated sufficient bonding strength, high reliability, and adequate mechanical properties as an attractive solution for high-temperature power electronics packaging.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Hanqiang Zhang,Xuejing Fan,Yangyue Ding,Lunzhao Yi,Kun Ge,Ying Gu
A novel and easy-to-prepare plasmonic nanoparticles doped semiconductor substrate—Zn@ZnO@Ag chip with ultra-high surface-enhanced Raman scattering (SERS) activity was fabricated for label-free, rapid and sensitive analysis of norfloxacin. The Zn@ZnO array was synthesized by surface oxidation at low temperature, followed by in-situ reduction to form leaf-like AgNPs on Zn@ZnO array without extra reducing agent, thus fabricating a Zn@ZnO@Ag chip. The ultra-high SERS activity is attributed to the synergistic effect of semiconductor characteristics of ZnO and surface plasmon resonance properties of leaf-like AgNPs. The possible enhancement mechanism was verified by density functional theory simulations. The proposed SERS method showed a wide linear range (3.0–500.0 μg/L) and low limit of detection (0.8 μg/L) for norfloxacin analysis. High sensitivity, good selectivity and acceptable recoveries (82.7–113.6%) in real sample analysis were obtained. This study offers a promising SERS chip-based platform for norfloxacin detection in the field.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shoulu Yang,Zhongwei Wang,Zhu Liu,Yiqiang Wu
In this work, we present a simple and effective approach to enhance the fire safety and anti-corrosion performance of wood by forming in-situ self-assembled amphiphilic Ag-PW nanospheres (NSP) at room temperature. The morphology and acid capacity of the NSP were optimized by changing the ratio of phosphotungstic acid (HPW) and silver nitrate. The Ag-PW NSP were successfully integrated into the bulk of the wood, resulting in a durable treatment with minimal leaching. Comprehensive characterization techniques, including FTIR, XPS, XRD, SEM, TEM, and nitrogen adsorption–desorption analysis, confirmed the in-situ formation of Ag-PW NSP in the wood. The treatment exhibited low-leaching properties with only 5.89% of Ag-PW1a leaching out. The treated wood demonstrated excellent flame-retardant (FR) properties, as evidenced by a limiting oxygen index value > 28% and easy passage of the UL-94 test, with the formation of a high-density char layer. The flammable pyrolysis products released during combustion were found to be significantly altered, with a change in the depolymerization route of conversion of LGO under acid conditions to HMF, which was verified by DFT calculations. The treated wood also exhibited outstanding anti-corrosion properties, with a mass loss rate of less than 1%, compared to at least 32.3% for bare wood after the anti-white or brown-rot fungus tests. Moreover, the treated wood samples maintained their excellent FR properties even after leaching. Our study provides valuable insights for the rational design of nano-material additives for wood protection, thereby improving the usage of wood resources while mitigating health and environmental hazards.
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危险品化学品经营许可证（带存储）