SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Runcheng Liu,Jie Yan,Jian Shi,Shouzhen Jiang,Wen Yang,Zihao Zhang,Mingshun Jiang
Tilted fiber Bragg grating-based surface plasmon resonance (TFBG-SPR) sensors, despite their portability and high sensitivity, often suffer from background interference and lack self-cleaning capabilities. Although two-dimensional materials possess the capacity to enhance sensor functionality, their integration frequently results in uneven dispersion or agglomeration of nanosheets, compromising stability and reproducibility. Herein, a novel TFBG-SPR sensor that integrates a large-area, self-supported covalent organic framework (COF) film with Ag nanoparticles (NPs) is proposed. The COF-366 film functions as a molecular sieve, selectively isolating target analytes from background molecules, thereby improving anti-interference performance. The Ag NPs generate localized surface plasmon resonance (SPR) hotspots, significantly enhancing the signal of the target analyte. Moreover, the sensor exhibits robust self-cleaning properties through SPR-driven photocatalytic degradation. These attributes collectively endow the sensor with superior anti-interference, self-cleaning, and high-sensitivity functionalities, making it suitable for reliable detection in practical applications. Experimental validation reveals that the sensor effectively eliminates background interference and maintains consistency across repeated measurements, achieving a detection limit of 1.5 × 10 –10 M for methylene blue. This work offers a promising candidate for large-scale environmental monitoring and other challenging detection scenarios, thereby expanding the application range of COF materials in advanced photonic devices.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 43
·18558-18568
·
IF 2.7
Ali Baqaei,Ali Asghar Sabbagh Alvani,Hassan Sameie,Federico Rosei
We designed and fabricated a photocatalyst made of reduced titanium dioxide nanorods (TiO2−x NRs) that incorporates silver nanoparticles (Ag NPs) and reduced graphene oxide (rGO) sheets, to narrow the band gap and improve the photoinduced degradation of methylene blue (MB). The morphological characterization showed that Ag NPs and rGO sheets were well-deposited on both the top surface and the outer walls of vertically oriented 1D TiO2−x NRs. Energy dispersive spectroscopy and specific surface area analyses confirmed the presence of both Ag NPs and rGO sheets and the as-obtained TiO2−x/Ag/rGO sample exhibited a large specific surface area (153.7 m2 g−1). Moreover, X-ray diffraction patterns contained peaks characteristic of tetragonal rutile TiO2 and confirmed that there is no phase change after reduction treatment. The optical investigation revealed that the formation of Ti3+ ions, surface defects and oxygen vacancies were considered as major reasons for the red shift of the absorption edge towards the visible region (546 nm) compared with pristine TiO2 NRs. The incorporation of Ag NPs and rGO with TiO2−x NRs improved the light absorbance and the narrowing of the TiO2−x bandgap energy (from 2.95 to 1.97 eV) as a result of the SPR effect of Ag NPs and the reduced light reflection in the presence of rGO. Therefore, among the various as-prepared photocatalysts, the TiO2−x/Ag/rGO (2% wt) photocatalyst showed the best performance, degrading almost 100% of MB under 120 min visible light irradiation. Kinetic studies confirmed that degradation reactions over all photocatalysts followed first order kinetics. The photodegradation rate toward MB over TiO2−x/Ag/rGO (2% wt) is 6.45, 1.85, and 1.6 times higher compared to that of pristine TiO2 NRs, TiO2−x and TiO2−x/Ag, respectively. The TiO2−x/Ag/rGO composite proves to be an exceptionally efficient photocatalyst for water treatment.
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THIN SOLID FILMS
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2024
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IF 2
Tran Dung Hoang,Thuy Chinh Nguyen,Thanh Tung Doan,Thanh Dung Ngo,Thi Yen Nguyen,Ba Thanh Ngo,Thanh Thuy Tran,Trong Lu Le
Polyvinyl alcohol (PVA) is a widely used polymer in the electrospinning technique. It is water-soluble, which limits the application of electrospun PVA matrix. In this study, chitosan (CS) and biosynthesized TiO 2 @Ag nanoparticles were incorporated into PVA to enhance its antibacterial properties and photocatalysis. The PVA/CS/TiO 2 @Ag nanofiber mat was prepared using the electrospinning method with a voltage of 20 kV, a needle-collector distance of 15 cm, and a flow rate of 0.5 mL. h − 1 . The concentrations of the PVA and CS solutions were 10% and 2%, respectively. The TiO 2 @Ag nanoparticles were synthesized using AgNO 3 solution, TiO 2 nanoparticles as precursors, and Cleistocalyx operculatus leaf extract as a reducing agent. The morphology and structure of the PVA/CS/TiO 2 @Ag nanofiber mat were analyzed using scanning electron microscopy and infrared spectroscopy. The PVA/CS/TiO 2 @Ag nanofibers exhibited an average fibril diameter of 116.4 nm. Additionally, the antibacterial activity against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ), as well as the photocatalytic properties of these mats, were assessed. The results indicated that the addition of CS and TiO 2 @Ag led to changes in the hydrophilic properties and antibacterial efficacy of PVA. The inhibition zones of the PVA/CS/TiO 2 @Ag nanofiber mat against E. coli and S. aureus were measured at 5 and 4 mm, respectively. The water contact angle of PVA/CS/TiO 2 @Ag nanofiber mat showed a significant increase. The PVA/CS/TiO 2 @Ag nanofibers were able to degrade 94.56 ± 0.57% and 98.17 ± 0.11% of methylene blue dye under sunlight irradiation after 10 and 20 min of exposure, respectively. These findings suggest that the PVA/CS/TiO 2 @Ag nanofiber mat has the potential for applications in the textile industry or medicinal field as antibacterial and photocatalytic coatings.
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Chemical Engineering and Processing-Process Intensification
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2024
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IF 3.8
Xiaocui Zhang,Xiaoxin Wang,Jun Gao,Jiangcheng Li,Xiangfeng Liang,Qinghui Shou
The global need for bromide ions (Br - ) has driven the research focus to extract them from various liquid ores. Highly efficient and selective adsorbent is still lacking. MOF with large surface area and structural stability are promising candidate for Br - extraction. In this work, we prepared Cu-MOF-74 nanocrystals. Abundant hydroxyl groups on them spontaneously reduced Ag + to Ag 0 nanoparticles, resulting in the fabrication of Ag 0 doped Cu-MOF-74. The crystalline structure retains after the doping of Ag 0 when the mass ratio of silver nitrate to MOF is <0.5. The crystals are distorted or even damaged when the ratio is higher than 1.0 according to XRD and DFT calculation. The adsorption capacity of Ag 3 -Cu-MOF-74 is 232.92 mg g -1 , surpassing the capacities of most previously documented adsorbents. The desorption of Br - and thereafter the recovery of adsorbent could be realized through light driven decomposition of AgBr. This MOF adsorbent shows promising application potential in Br - recovery from various liquid ores.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
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IF 5.4
Ziyu Liu,Huanrui Liu,Daofu Zhang,Yongsheng Li,Fangfang He,Zhuoni Jiang,Hongxia Yang,Xinghua Zhu,Wenbin Yang
By intelligently modulating the thermal energy exchange between the skin and the environment, phase change fabrics are important for improving the thermal comfort of the wearer, saving energy, and expanding the functionality of smart textiles. In this study, paraffin@SiO 2 @Ag phase change microcapsules (M s ) were tightly encapsulated in calcium alginate (CA) matrix using wet spinning process. CA/M s phase change composite fibers with different mass ratios were designed. When the CA/M s mass ratio was 1:1, the CA/M s phase change enthalpy ΔH m was 64.3 J/g, and the maximum tensile strength was 1.27 MPa, along with excellent thermal stability and photothermal conversion efficiency. In addition, the introduction of different contents of carbon nanotubes (CNTs) into CA/M s could improve the thermal conductivity and photothermal conversion efficiency. When the cont1ent of CNTs was 10 phr, the thermal conductivity of CA/M s /CNTs (CMC) was increased by 159 %. Therefore, these phase change composite fibers with excellent photothermal efficiency offer new possibilities for the exploitation of smart fabrics and are anticipated to have a significant role in the area of smart textiles.
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LANGMUIR
·
2024
·
IF 3.7
Zhenmin Wu,Jie He,Guoyu Zhao,Xiaoyan Tang,Junqing Li,Wenhang Chen,Ruiqi Li
The current membrane materials used for oil–water separation suffer from low separation efficiency and poor durability, and membrane contamination is also a key issue that must be addressed urgently. In this paper, a superhydrophilic PANI/Ag/TA@PVDF composite membrane with PANI-Ag NPs heterojunction structure was prepared via chelation and reduction of Ag+ by tannic acid (TA) and in situ growth of hydrochloric acid-doped polyaniline (PANI). TA endows the prepared composite membrane with excellent superhydrophilicity and underwater oleophobicity, remarkable oil–water separation capacity (the separation efficiency of more than 97% for soybean oil), and extraordinary antifouling properties. Notably, the range of photodegradation is expanded from UV to visible light by the construction of a Schottky heterostructure between PANI and Ag NPs, the photocatalytic degradation ability of composite membrane for organic pollutants has been improved obviously, and the degradation efficiency for crystal violet (CV) is 97.9%. Considering these merits, the PANI/Ag/TA@PVDF composite membrane provides an effective strategy to overcome the shortcomings of existing membrane materials, presenting enormous potential in the treatment and purification of oily wastewater.
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PubMed
高影响因子
ChemNanoMat
·
2024
·
IF 2.6
Xue Qi,Hao Lv,Yuxin Wang,Yang Ye,Peike Wang,Ao Yin,Jingjing Luo,Haipeng Liu,Zhongqi Ren,Jiang Liu,Suzhu Yu,Jun Wei
Flexible sensors, being a vital component of flexible devices, determine the functionalities and performance capabilities of the devices., especially, are widely used in flexible sensors in past research due to their great advantages in flexibility and sensitivity. In this work ， silver nanowires with aspect ratios of 600, 1000, and 1400 were synthesized by adjusting the synergy of Br– and Cl–, along with other process parameters, leading to an improved production efficiency of silver nanowires. The stability of the conductive network is enhanced when the aspect ratio of silver nanowires is 1000 and 1400.The sensor demonstrated high sensitivity at high strain, along with an extended strain range. Moreover, it was observed that increasing the aspect ratio of silver nanowires led to a more stable conductive network, thus enhancing the sensor's stability with over 10000 stretching cycles. under the appropriate deposition density, silver nanowires with aspect ratio of 600 have high sensitivity to low strain, and silver nanowires with aspect ratio of 1400 have high sensitivity to high strain, up to 247.3. Introducing microstructures on the surface of PDMS resulted in an increased maximum sensitivity of the sensor with decreasing microstructure size, reaching a maximum sensitivity of 322.2.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Shuying Yang,Fan Zhang,Jinping Zhao,Haijiao Kang,Qing Ke
Silver/titanium dioxide (Ag/TiO 2 ) nanoparticles, renowned as effective inorganic antibacterial agents with a wide spectrum of activity and minimal resistance induction, encounter challenges when incorporated into organic substrates. This integration often leads to particle aggregation, resulting in a substantial reduction in antibacterial efficacy. This study devised a novel approach involving loading Ag/TiO 2 nanoparticles onto polyurea microcapsules (PUMC), forming hybrid-shelled microcapsules (Ag/TiO 2 -PUMC) using silane coupling agents. The preparation of polyurea microcapsules offers the advantages of rapid synthesis and mild reaction conditions, facilitating industrial-scale production. Additionally, loading Ag/TiO 2 nanoparticles onto polyurea microcapsules helps alleviate the aggregation issue, and the organic nature of polyurea microcapsules enhances compatibility with organic substrates. Characterization techniques, including SEM, TEM, FTIR, XRD, UV–visible absorption spectroscopy, EPR and thermogravimetric analysis, were employed to confirm the successful grafting of Ag/TiO 2 nanoparticles onto the PUMC. A comparative analysis between the two silane coupling agents, KH550 and KH792, revealed that the dual amino-functional silane coupling agent, KH792, played a pivotal role in chain extension during the microcapsule self-polymerization process. The antibacterial activity of the Ag/TiO 2 -PUMC was evaluated against Escherichia coli and Staphylococcus aureus . Remarkably, the hybrid-shelled microcapsules exhibited outstanding antibacterial efficacy, achieving a 99.99% antibacterial rate within just 0.5 hours. This performance surpassed unmodified Ag/TiO 2 nanoparticles, highlighting the enhanced antibacterial efficacy of the hybrid-shelled microcapsule structure. This study presents a successful synthesis strategy for inorganic/organic hybrid-shelled antibacterial microcapsules and provides valuable insights for refining inorganic antibacterial agents. The demonstrated approach holds substantial promise for advancing the field of organic antibacterial materials.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jiawei Wang,Ruirui Qiang,Qiaowei Miao,Ruiling Hu,Huihui Chen,Shaobo Guo,Zhifeng Liu
With antibiotic resistance on the rise due to misuse, the urgent need for new antibacterial materials has become paramount in global health. Herein, a CuFe 2 O 4 /MoS 2 (CFM) composite with a large specific surface area was synthesized through a simple hydrothermal method and physical adsorption, and the subsequent loading of silver nanoparticles (Ag NPs) onto its surface yielded the nanocomposite CuFe 2 O 4 /MoS 2 @Ag (CFMA) with a rough defect-rich surface. The nanocomposite demonstrates remarkable antibacterial activity against Escherichia coli , Staphylococcus aureus , and drug-resistant Salmonella ( T-Salmonella ) by releasing metal ions that alter the electrical potential of bacterial cell membranes, compromise the integrity of cell membranes, and produce reactive oxygen species that lead to oxidative stress. It thus achieves an antibacterial rate of 96 % against the three tested bacterial strains within just 20 min at a concentration of 200 μg/mL. The composite exhibits a broad-spectrum antibacterial effect against Gram-negative and Gram-positive bacteria, as well as drug-resistant bacteria. Moreover, CFM acts as a carrier that effectively prevents the aggregation of Ag NPs, and the magnetism of CuFe 2 O 4 facilitates the recovery of the antibacterial agent. This work provides new ideas and methods for the development of highly efficient, cost-effective, and biocompatible antibacterial materials.
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ADVANCED POWDER TECHNOLOGY
·
2025
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IF 4.2
Xinyu Cai,Yiduo Chen,Dandan Wang,Zhongming Su,Weiting Yang
Here, a biomass-based composite interfacial evaporation system utilizing a Ti-MIL-125-NH 2 /Ag (Ti-MIL-125/Ag; MIL-125/Ag) catalyst was successfully developed, which innovatively achieved synergistic enhancement of photothermal conversion and photocatalytic degradation. Initially, the precisely engineered Ag nanoparticles-modified Ti-MIL-125-NH 2 significantly enhanced visible-light absorption capacity and charge carrier separation efficiency. Furthermore, a Bam@MIL-125/Ag three-dimensional porous interfacial evaporator was constructed using eco-friendly and low-cost bamboo substrate through the sodium alginate gelation. At a height of 1.5 cm, 5 wt% of Ag loading, and a content of 20 mg of Ti-MIL-125/Ag in the Bam@MIL-125 evaporator, the Bam@MIL-125/Ag system under 1 kW·m −2 simulated sunlight demonstrated an evaporation rate of 1.45 kg·m −2 ·h −1 and a solar-to-vapor conversion efficiency of 81.2 %. Notably, leveraging photo-generated free radicals from Ti-MIL-125/Ag, the Bam@MIL-125/Ag evaporator achieved efficient removal (98.67 %) of volatile organic compounds (VOCs) in water through the photocatalytic degradation process. Furthermore, when operating continuously for 56 h in a 3.5 wt% NaCl solution, the Bam@MIL-125/Ag evaporator maintained an evaporation rate above 1.4 kg·m −2 ·h −1 , demonstrating excellent stability, salt resistance, and heavy metal removal capabilities in practical applications. This work provides an innovative strategy for designing MOF-based evaporators that combine high-performance water production with advanced purification functionality.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Yanbing Zheng,Dongying Liu,Honghui Gai,Fanhui Lin
A novel surface-enhanced Raman scattering (SERS)-imprinted membrane is engineered through a synergistic integration of SERS technology and molecular imprinting technology (MIT). Polyamide (PA-6) serves as the supporting membrane due to its mechanical properties and is further modified with UIO-66 (NH 2 )–Ag as SERS substrates. Molecular imprinted polymers (MIPs) are synthesized to produce the SERS imprinted membrane (Ag/PA-6/UIO-66(NH 2 )@MIPs membranes, APU-MIMs) for selective detection of rhodamine B (RhB). It is reflected from the results that APU-MIMs exhibits excellent SERS performance with high sensitivity and specific recognition ability, reaching a detection limit of 10 −12 M. The APU-MIMs also presents the advantages of non-destructiveness, good stability and recyclability. Overall, it pioneers a novel synthetic strategy for fabricating SERS membranes with superior analytical performance, thereby expanding the practical scope of SERS-based sensing technologies.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 8
·1-12
·
IF 2.4
Ma Xueqin,Shen Liuwei,Shi Gaolei,Zhang Xingguang
The selective oxidation of 5-hydroxymethylfurfural (HMF) to value-added products plays an important role in biomass catalytic transformation, which essentially depends upon design of highly efficient and selective catalysts. This study aims to identify contributions of silanols (Si-OH groups) on Ag/USY catalysts to regulating catalytic performances in selective oxidation of HMF to HMFCA (5-hydroxymethyl-2-furancarboxylic acid), by means of aluminium tri-sec-butoxide (AlBO) modification to suppress Si-OH groups of USY and 2,6-di-tert-butylpyridine (2,6-DTBPy) selective poison to shield Brønsted acid sites in the reaction system. The catalysts are characterized by XRD, BET, TEM, XPS and FT-IR to examine the crystal structures, surface areas, porosity, morphology, Ag distribution, chemical states, and surface adsorptive properties. The HMF conversion (44-49.2%) slightly changes with increasing AlBO content, whereas the HMFCA selectivity gradually goes down from 56.2 to around 22.1% and the levulinic acid (LA) selectivity minorly raises from 5.6 to 12.8%. The production of LA originates from enhanced Brönsted acid sites after AlBO modification, and the decline of HMFCA selectivity is principally attributed to the suppression of Si-OH groups that weakens the interaction between HMF reactants and catalysts. This work provides new insights into the role of surface modification in tailoring metal and zeolite-based catalysts for organic conversions. Graphical
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