ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Ming Yi,Cher Hon Lau,Shu Xiong,Wenjie Wei,Rongzhen Liao,Liang Shen,Ang Lu,Yan Wang
Biofouling can be overcome with zwitterion grafts and antimicrobial, metallic nanoparticles. However, the mechanism underpinning this effective approach remains unclear. To elucidate the role of each component in this system while maximizing membrane antifouling and antimicrobial properties, here we performed a comparative study to investigate the impact of zwitterion type and their interactions with Ag of various states. Two different zwitterions (SO3–-based and COO–-based) were employed to modify polyamide (PA) thin film composite (TFC) membranes, and the metallized and mineralized membranes were developed via in situ formation of silver (Ag) nanoparticles and deposition of silver chloride (AgCl) particles on the zwitterion-modified TFC membranes. The presence of zwitterions was key to enhance Ag content, resulting in significantly improved antimicrobial and antifouling properties without compromising the nanofiltration separation performance. COO–-based zwitterions were found more favorable toward Ag metallization and mineralization compared to SO3–-based zwitterions. The underlying mechanisms underpinning this discovery were further revealed using density functional theory (DFT) to reveal Gibbs free energy of the binding between zwitterions and Ag+ ions. This fundamental knowledge is crucial for designing next-generation antibiofouling strategies.
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International Journal of Nanomedicine
·
2023
·
IF 8
Yong Huang,Guiqin Song,Xiaotong Chang,Zhenhui Wang,Xuejiao Zhang,Shuguang Han,Zhuobin Su,Hejie Yang,Dongdong Yang,Xiaojun Zhang
Background Poor mechanical properties, undesirable fast dissolution rate, and lack of antibacterial activity limit the application of hydroxyapatite (HA) as an implant coating material. To overcome these limitations, a hybrid coating of Ag+-substituted fluorhydroxyapatite and titania nanotube (TNT) was prepared.Methods The incorporation of silver into the HA-TiO2 hybrid coating improves its antimicrobial properties. The addition of F as a second binary element increases the structural stability of the coating. The TNT/F-and-Ag-substituted HA (FAgHA) bilayer coating on the Ti substrate was confirmed by X-ray diffraction, scanning electron microscope, energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS).Results The results indicate that the FAgHA/TNT nanocomposite coating has a dense and uniform morphology with a nano-rod-like structure. The solubility measurement result shows that the substitution of F− ions into the AgHA structure has a positive effect on the dissolution resistance of HA. The adhesion strength of FAgHA/TNT has significantly increased because of the interlocking of the roughened surface with nano-rod-like particles that entered into the voids of the TiO2 nanotubes. Compared with that of the bare Ti, the corrosion current density of FAgHA/TNT-coated Ti substrate decreased from 3.71 to 0.18 μA, and its corrosion resistance increased by almost two orders of magnitude. Moreover, despite pure HA, the FAgHA killed all viable Staphylococcus aureus after 24 hours of incubation. Although the fabricated FAgHA/TNT coating is hydrophobic, it induced deposition of the typical spherical apatite when immersed in a simulated body fluid (SBF); the osteoblasts spread very well on the surface of the coating. In addition, in vitro cell culture tests demonstrated cell viability and alkaline phosphatase (ALP) similar to pure HA, which indicated good cytocompatibility. Interestingly, compared with bare Ti, FAgHA/TNT-coated Ti surface was innocent for cell vitality and even more beneficial for cell osteogenesis in vitro.Conclusion Enhancing the osseointegration and preventing infection in implants, the FAgHA/TNT-coated Ti makes implants more successful.
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ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Yuliang Jiang,Zhaoyin Wang,Zhihui Dai
A novel nanocomposite, silicon–carbon-based dots@dopamine (Si-CDs@DA) was prepared using (3-aminopropyl) triethoxysilane, glycerol, and dopamine as raw materials via a rapid microwave-assisted irradiation. This type of Si-CDs@DA exhibited ultrabright fluorescence emission (quantum yield of 12.4%) and could response to Ag+ selectively and sensitively. Moreover, the obtained Si-CDs@DA can be further applied in sensing intracellular Ag+ and cell imaging, because of its photostability, salt stability, and low cytotoxicity. This study provides a simple and efficient approach for preparing novel Ag+ fluorescent probes, which could expand the application of carbon nanomaterials in designing related biosensors.
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FOOD CONTROL
·
2021
·
IF 5.548
Alberta Osei Barimah,Zhiming Guo,Akwasi A. Agyekum,Chuang Guo,Ping Chen,Hesham R. El-Seedi,Xiaobo Zou,Quansheng Chen
Arsenic (As) is one of the toxic, persistent, and lethal heavy metalloids and requires rapid, less costly, and sensitive detection methods. This study proposed a label-free cuprous oxide/silver (Cu 2 O/Ag) surface-enhanced Raman scattering (SERS) nanoprobe to detect total As in tea. Different total As spiked tea concentrations were mixed with the Cu 2 O/Ag SERS nanoprobe for the SERS detection. Quantitative models were established for predicting the total As in tea by comparatively applying chemometric algorithms. Amongst the algorithms, competitive adaptive reweighted sampling partial least squares (CARS-PLS) optimized the most effective spectral variables to predict the total As in tea efficiently. The CARS-PLS gave the highest correlation coefficient value (R p = 0.9935), very low root means square error (RMSEP = 0.0496 μg g −1 ) in the prediction set and recorded the highest RPD value of 8.819. The proposed nanoprobe achieved a lower detection limit (0.00561 μg g −1 ), excellent selectivity, satisfactory reproducibility, and stability. No significant difference was recorded when the performance of the Cu 2 O/Ag total As SERS sensor was compared with the inductively coupled plasma mass spectrometry (ICP-MS) method. Therefore, this developed Cu 2 O/Ag coupled chemometrics SERS sensing method could be used to efficiently determine, quantify, and predict total As in tea to promote monitoring of heavy metal contaminants.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
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IF 6.3
Wenjian Chan,Yu Mao,Mengyang Wang,Yuanyuan Huang,Yanmei Deng,Ziyang Ren,Ening Gu,Xianzhong Lin,Guowei Yang
The fabrication of kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells based on fluorine-doped tin oxide (FTO) substrates, as an alternative to conventional molybdenum, is highly attractive for applications in semitransparent, bifacial and tandem photovoltaic devices. Although FTO exhibits phase stability during the high-temperature annealing process required for CZTSSe grain growth, its electrical conductivity decreases significantly, impairing carrier transport and limiting device performance. Addressing this issue necessitates lowering the annealing temperature without compromising the crystallinity of the CZTSSe absorber layer. In this study, we demonstrate the growth of high-crystallinity CZTSSe absorbers on FTO substrates at a reduced temperature of 500 °C, facilitated by silver (Ag) and sodium (Na) doping in the precursor film. The absorbers were fabricated from a 2-methoxyethanol-based molecular ink, and the annealing duration was systematically optimized. We found that the crystallinity and morphology of the CZTSSe layer are strongly influenced by annealing time. An optimal film morphology was achieved with a 15-min anneal, whereas shorter annealing (≤10 min) resulted in incomplete crystallization, and extended annealing (>20 min) promoted void formation within the absorber due to Ostwald ripening. Furthermore, the optimized annealing process reduces the interface defect density and broadens the depletion width of the device, leading to a record power conversion efficiency of 9.4 % for CZTSSe solar cells on bare FTO substrates. These results provide important insights for developing efficient bifacial CZTSSe solar cells.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
·
IF 4.6
Cunwei Wang,Man Peng,Xishun Peng,Haili Zhang,Caizhen Zu,Zhangwei Tan,Yuxue He,Zhongchen Bai
This study presents a surface-enhanced Raman scattering (SERS) sensing platform based on a MoS 2 /Au@Ag heterojunction for specifically detecting the residues of thiram pesticide. A Nano-MoS 2 film was firstly prepared by depositing MoS 2 nanosheets on the surface of a stainless steel sheet. Subsequently, Au nanoparticles and Ag nanoparticles were deposited on the surface of MoS 2 film to form a MoS 2 /Au@Ag heterojunction for SERS application. This well-performing SERS substrate was originated from the synergistic effect of electromagnetic (EM) enhancement and chemical (CM) enhancement to boost its SERS signal. Here, the CM contribution could be up to 41.8 % in the process of optimizing interfacial charge transfer (CT) pathways in MoS 2 /Au@Ag heterojunction. Thus, the SERS sensor based on MoS 2 /Au@Ag film showed an excellent signal homogeneity (RSD = 4.36 %) and an ultrahigh sensitivity to thiram molecules with a limit of detection (LOD) as low as 0.32 nM. Moreover, it could also recognize the thiram residues at 10 nM level in citrus peels, with a recovery rate of 91.0–109.0 %. The SERS sensor we developed in this study has a high sensitivity, excellent reproducibility, and long-term stability, which could be widely applied for the food safety monitoring
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Polymers
·
2020
·Vol. 12
·期 4
·783
·
IF 3.426
Ke Wang,Qian Ma,Yuanming Zhang,Shudong Wang,Guangting Han
In this study, Cu/Ag/polydopamine (PDA)/polyester (PET) fabrics were fabricated for multi-functional textiles. The PET fabrics were firstly modified by dopamine to form a polydopamine (PDA) layer on the fiber surface, then Ag nanoparticles (Ag NPs) were anchored on fiber surface through chelation between PDA and Ag+ions, and the Ag NPs were further used as catalytic seeds for in situ reduction of Cu nanoparticles (Cu NPs). The surface morphology, chemistry, and crystalline structure of the prepared PET fabrics were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). As expected, Cu NPs were evenly dispersed on the surface of fibers. The Cu/Ag/PDA/PET fabrics showed good antibacterial property againstEscherichia coliand exhibited excellent electromagnetic interference (EMI) shielding ability. The Cu/Ag/PDA/PET fabrics with high performance antibacterial and EMI shielding properties can be applied as functional protective textiles.Keywords:Cu NPs;Ag NPs;polydopamine;PET fabrics;antibacterial;electromagnetic interference shielding
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JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Ting Luo,Xuefeng Hu,Zhaozhu She,Jinsheng Wei,Xue Feng,Fei Chang
In this study, a simple protocol for synthesizing silver doped and morphological regulation to improve the photocatalytic performance of g-C 3 N 4 was reported. The as-synthesized single atom dispersed Ag doped graphitic carbon nitride nanosheets (Ag-CNNS) showed excellent performance for the degradation of 2-Mercaptobenzothiazole (MBT) and Rhodamine B (RhB) under visible light irradiation, mainly attributing to the synergistic effect of Ag doping and porous carbon nitride nanosheets (CNNS). On one hand, Ag doping promoted the capture and transfer of photogenerated electrons in g-C 3 N 4 . On the other hand, the presence of crimped nanosheets enabled g-C 3 N 4 to have a larger specific surface area and shorten the charge diffusion distance from bulk to surface. Moreover, the increased photocurrent response proved that carriers had higher transport efficiency and interfacial catalytic reactivity. Cycle experiments confirmed that the 1% Ag-CNNS sample has good photocatalytic stability and reusability. Possible photocatalytic mechanism was proposed basing quenching experiment.
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Frontiers in Chemistry
·
2022
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IF 5.545
Tian Xiaoran,Yu Qian,Kong Xianming,Zhang Miao
The colloidal polystyrene (PS) was synthesized and decorated with silver nanoparticles (Ag NPs). The plasmonic Ag@PS nanocomposite was prepared by loading Ag NPs on PS microsphere through a seed-mediated in situ growth route. The property of Ag NPs deposited on the PS microsphere could be precisely controlled by adjusting the concentration of the chemicals used in the growth medium. The growth step is only limited by the diffusion of growing species in the growth media to the surface of the Ag seed. The Ag@PS prepared via the in situ growth method exhibited two advantages compared with the self-assembled PS/Ag. First, the high-density of Ag NPs were successfully deposited on the surface of PS as the electroless-deposited Ag seed process, which brings nearly three times SERS enhancement. Second, the rapid preparation process for in situ growth method (half an hour, 10 h for the self-assembled method). The PS/Ag could detect Nile blue A (NBA) down to 10–7 M by SERS. Furthermore, the plasmonic Ag@PS SERS substrate was used for pesticide identification. The on-site monitoring malachite green (MG) from fish was achieved by portable Raman spectrometer, and the limit of detection (LOD) was 0.02 ppm. The Ag@PS substrate has also shown capability for simultaneously sensing multiple pesticides by SERS.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2017
·Vol. 64
·期 11
·1308-1315
·
IF 0.935
Ming-Hai Zhang,Guo-Bin Yi,Xi-Hong Zu,Hai-Liang Huang,Yun-Jia Wang,Jian-Chao Wang,Ben-Bin Zhong,Hong-Sheng Luo
In this study, the galvanic displacement reaction between silver and AuCl 4 − was carried out to synthesize a series of silver nanowire (Ag NW) @ gold nanoparticle (Au NP) hybrid nanowires. The influence of Ag NW @ Au NP hybrid nanowires on the fluorescence properties of the poly (3-hexylthiophene) (P3HT) was investigated. The particle sizes of Au NPs on the hybrid nanowires could be adjusted by varying the reaction time and the concentration of the HAuCl 4 solution. Furthermore, steady-state fluorescence measurements showed that the fluorescence intensity of the P3HT films was higher on various Ag NW @ Au NP hybrid nanowires compared to that on a bare silicon substrate. This was due to the increase in the intensity of electromagnetic field by the localized surface plasmon resonances of Au NPs and surface plasmon polaritons of Ag NWs from the hybrid nanowires. The results were further confirmed by the Raman spectra of the P3HT films on different substrates.
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ACS Omega
·
2021
·
IF 3.512
Runtian He,Teng Ma,Jiong Cheng,Binbin Jin,Jing Xu
Formation of formic acid from renewable biomass resources is of great interest since formic acid is a widely used platform chemical and has recently been regarded as an important liquid hydrogen carrier. Herein, a novel approach is reported for the conversion of glucose, the constituent carbohydrate from the cellulose fraction of biomass, to formic acid under mild hydrothermal conditions with simultaneous reduction of Ag2O to Ag. Results showed that glucose was selectively converted to formic acid with an optimum yield of 40.7% and glycolic acid with a yield of 6.1% with 53.2% glucose converting to carbon dioxide (CO2) immediately at a mild reaction temperature of 135 °C for 30 min. In addition, Ag2O was used as a solid oxidant for glucose oxidation, which avoids the use of traditionally dangerous liquid oxidant H2O2. Furthermore, complete conversion of Ag2O to Ag can be achieved. This study not only developed a new method for value-added chemical production from renewable biomass but also explored an alternative low-carbon and energy-saving route for silver extraction and recovery.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Shimin Sun,Qing Yulan Li,Li Cai,Jun Qi,Zhongbo Li,Zuju Shu,Lijun Zhang
The short shelf life of fresh pork, primarily caused by microbial contamination and lipid oxidation, remains a challenge for the food industry. To address this, we developed a novel active packaging composite film by coating a functionalized layer of carboxymethyl chitosan/tannic acid embedded with silver-based metal–organic frameworks (CTA) onto polyethylene (PE). The resulting PE/CTA films exhibited superior tensile strength (18.16 MPa), exceptional UV adsorption capacity (>98 %), enhanced barrier properties (against oxygen, moisture), and potent antibacterial/antioxidant activities. Notably, the optimized PE/CTA-8 film effectively extended the shelf life of fresh pork by 6 days compared to pure PE, as evidenced by significantly reduced weight loss, total viable count (TVC), pH, total volatile basic nitrogen (TVB-N), and thiobarbituric acid reactive substances (TBARS) values. This work presents a promising strategy for developing high-performance food packaging materials with significant commercial potential.
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