BIOELECTROCHEMISTRY
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2019
·
IF 4.474
Mei Wu,Yuxiao Yang,Kaihang Cao,Chulei Zhao,Xiuwen Qiao,Chenglin Hong
In this study, a novel signal-amplified immunosensor was designed by using a microwave-assisted self-assembly method to synthesize ZnFe 2 O 4 -Ag/rGO nanocomposites. The conductivity of ZnFe 2 O 4 -rGO nanocomposites was significantly improved due to the effective inhibition of rGO accumulation by the insertion of ZnFe 2 O 4 and Ag nanoparticles (NPs) into graphene sheets. Excellent sensitivity and reproducibility were achieved through the microwave-assisted preparation of ZnFe 2 O 4 -Ag/rGO nanocomposites as a substrate, with the Ag NPs enhancing the signal because of the effective conductive matrix. The layer assembly process of the immunosensor was verified by cyclic voltammetry and electrochemical impedance spectroscopy. Under optimal conditions, the fabricated immunosensor showed good linearity over a wide concentration range from 1 pg mL −1 to 200 ng mL −1 with a low detection limit of 0.98 pg mL −1 , and exhibited excellent specificity, good stability, and reproducibility. These qualities can contribute to the successful application of a label-free immunosensor in the detection of AFP in human serum.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Bo Wei,Jintang Zhou,Zhengjun Yao,Azhar Ali Haidry,Xinlu Guo,Haiyan Lin,Kun Qian,Wenjing Chen
In the present work, high purity cubic silicon carbide (β-SiC) was synthesized by using resorcinol-formaldehyde aerogel coated silica as precursor at high temperature. Subsequently, β-SiC was coated with various concentrations of silver nanoparticles (Ag NPs) by tin sensitization electroless plating . Thereafter, the effect of various Ag NPs contents on the dielectric and microwave absorption properties of β-SiC was investigated in detailed. It is found that the Ag NPs can significantly increase the overall complex permittivity, reduce the thickness of the absorber and increase the absorption bandwidth to some extent. Despite, the improvement of the attenuation ability of electromagnetic wave with increasing contents of Ag NPs also has an adverse effect on impedance matching. The improvement in the microwave absorption of β-SiC coated with Ag NPs mainly comes from the enhancement of dipole polarization, interface polarization and conductivity loss. In the 2–18 GHz band, Ag@SiC (1.0 g/L) can achieve an effective bandwidth of 4.99 GHz at a thickness of 1.6 mm, and it is a kind of lightweight, high-temperature microwave absorbent with excellent performance.
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Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 40
·6202-6209
·
IF 5.047
Zhiqiang Wang,Xiuzhen Huang,Sheng Jin,Hongwei Wang,Lin Yuan,John L. Brash
The continuing emergence of antibiotic-resistant bacteria due to the excessive use of antibiotics has produced a strong demand for novel strategies and new materials that do not lead to bacterial resistance. In the present work silicon nanowire arrays modified with gold–silver alloy nanoparticles (SN-Au/Ag) was investigated as a photo-induced antibacterial material. It was shown that SN-Au/Ag can kill bacteria with high efficiency under sunlight in times of the order of a few minutes, and this is achieved through synergism between photothermal and photocatalytic effects. It appears that the combined effect of heat and reactive oxygen species (ROS) causes bacteria killing through damage to the cell membrane and leakage of cytoplasm contents. Both gold and silver in the alloy nanoparticles are required for the observed bactericidal action. Moreover, the SN-Au/Ag material can be “recycled” without loss of bactericidal activity. It is concluded that the silicon nanowire arrays modified with gold–silver alloy nanoparticles developed in this work has promise as an antibacterial nanomaterial for the development of novel antibiotics.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Huan Jiang,Baihui Wang,Ruyi Tang,Yaoyu Tan,Mengyao Qi,Xia Zhang
Although thiourea and its derivatives are applied in medical, food, and chemical industries, sensitive thiourea detection remains a challenging and noticeable topic. Surface-enhanced Raman spectroscopy assay based on an enzyme-inhibition strategy is promising for the detection of thiourea residues. Therefore, in this study, Ag/CeO 2 nanomaterials with dual enzyme-Like Activities were synthesized to detection thiourea. We discovered that the Ag/CeO 2 nanozymes demonstrated strong peroxidase-like activity and oxidase-like activity, moreover they can accelerate and catalyze 3,3′,5,5′-tetramethylbenzidine enzymatic reaction , with significantly increasing the Raman signal. Instead, once thiourea was introduced into Ag/CeO 2 nanozymes, due to the influence of thiourea molecules occupation and nanozymes aggregation, the peroxidase-like activity and oxidase-like activity of Ag/CeO 2 decreased sharply, and the colorless substrate 3,3′,5,5′-tetramethylbenzidine would not undergo color changes. Based on this observation, a Raman method for detecting thiourea using oxidized 3,3′,5,5′-tetramethylbenzidine as a probe molecule was developed. The Raman intensity showed a good linearity for the concentration of thiourea in the range of 10 −11 M−10 −1 M with a correlation coefficient of R 2 = 0.9881, and the limit of detection is 2.4 × 10 −13 M. Therefore, the proposed Raman mode sensors exhibited excellent selectivity and anti-interference ability which offers a new avenue for exploiting environmental monitoring.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 3
·2413-2418
·
IF 2.195
Hu Bo,Yang Fan,Peng Ye,Hang Chunjin,Chen Hongtao,Lee Changwoo,Yang Shihua,Li Mingyu
Ag nanoparticle (NP) paste is considered to be a next-generation thermal interface material. However, its sintered microstructure is at risk of volume shrinkage and mechanical property degradation under harsh environments. In this work, silicon carbide (SiC) NPs were mixed with Ag NP paste to improve the stability and reliability of sintered Ag joints. Robust joints were prepared by a rapid thermal compression method at 275 °C for 20 s. Although the addition of SiC NPs degraded the initial shear strengths of these joints, the SiC-containing joints exhibited excellent mechanical properties and microstructural stability during thermal shock tests from − 50 to 150 °C for up to 1000 cycles. When the added amount of SiC NPs was 2%, the joints achieved the highest shear strength of 87.1 MPa (after 1000 cycles). In addition, the shear strengths of the joints were investigated at 250 °C. The addition of SiC NPs is believed to enhance the reliability of joints at high temperature.
研究领域:
材料科学
·
纳米技术
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LANGMUIR
·
2021
·
IF 3.882
Xinming Shi,Ci Huang,Zhijuan Zheng,Baohua Zhong,Guanjun Ding,Jumei Li,Lijun You,Shaoyun Wang
In the present research, magnetically recyclable polyphosphazene (PCTP)/Ag (MPCTP-Ag) nanoparticles are prepared by a green path, in which PCTP was used to modify Fe3O4 nanoparticles and provide nucleation sites for the reduction of Ag nanoparticles. The prepared MPCTP-Ag nanoparticles were characterized by TEM, SEM, EDS, BET, XRD, vibrating sample magnometry, XPS, and TGA analysis. The catalytic performances of the MPCTP-Ag nanoparticles for the degradation of 4-nitrophenol (4-NP), methylene blue (MB), methyl orange (MO), and their mixtures in the presence of NaBH4 were studied. The main factors affecting the catalytic performance, including temperature, reactant concentration, and catalyst dosage, were investigated. The results showed that the MPCTP-Ag nanoparticles exhibited excellent catalytic activity for the degradation of all three targeted organic contaminants (4-NP, MB, and MO). Moreover, the product retains its catalytic activity after being reused five times by magnetic separation. The results showed that MPCTP-Ag composite nanoparticles were efficient recyclable magnetic nanocatalysts with promising application in environment protection.
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TALANTA
·
2023
·
IF 6.1
Jiaqi Liu,Chunning Chen,Jiaxin Lu,Yalei Wang,Jingtong Zhai,Hongkun Zhao,Nan Lu
Surface-enhanced Raman scattering (SERS) is an important analytical technique. Its detection sensitivity and reproducibility depend on the density and distribution of SERS hotspots. Self-assembly is an efficient method to produce of SERS substrates due to its easy accessibility. However, the assembled defects can hardly be avoided on large area, which could lower the density and uniformity of the hotspots, leading to poor SERS performance. Herein, we report a method to reduce the defects by taking a patterned substrate as template to confine the assembly of Ag nanocubes. The template was prepared based on the combination of photo lithography and self-assembly. Confined by the template, the Ag nanocubes were assembled closely in each dots of the pattern. The limit of detection (LOD) is down to 3.42 × 10 −17 M and the enhanced factor (EF) is up to 3.44 × 10 10 on the prepared substrate for detecting rhodamine 6G (R6G). In addition, the relative standard deviation (RSD) of the different substrates is 8.75 %. The assembled Ag nanocubes exhibits high sensitivity and reproducibility as SERS substrate, which are contributed by the formation of high-density and uniform hotspots. The prepared substrate can be used for detecting trace amounts of melamine in milk with LOD of 2.06 × 10 −7 M and RSD of 6.91 %, so the substrate is applicable for analyzing various analytes.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Cong Wu,Chun Zhang,Xianyi Yan,Qian Liang,Kang Zhao,Yufei Tang
The titanium dioxide drug-loaded nanotube coating on titanium alloy surface was helpful to reduce the risk of infection after implantation in vivo. In this work, Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 (marked as BCZT) with piezoelectric effect and Ag nanoparticles with antibacterial effect were introduced into the TiO 2 nanotube coating, and a piezoelectric and antibacterial BCZT-Ag coating was prepared on titanium surface. The drug release rate in the nanotubes was reduced by the design of the coating structure. The results showed that the Ag nanoparticles were uniformly distributed in the BCZT-Ag coating. The piezoelectric coefficient of BCZT-Ag2.5 coating reached 13.0 pC/N. The release of silver ions in the BCZT-Ag coating showed a significant slow release trend compared with that in the TiO 2 nanotube silver-loaded coating. Interestingly, the antibacterial rate of polarized BCZT-Ag2.5 coating reached 99% even after being immersed in simulated body fluids for 7 days. The BCZT-Ag2.5 coating has no osteoblast toxicity, and osteoblasts can adhere to the BCZT-Ag2.5 coating on titanium surface. The BCZT-Ag2.5 also shows good biological activity in the simulated body fluid immersion experiment. The results will provide a new idea and data support for the application of biological piezoelectric silver loaded coating on titanium surface in orthopedic implants.
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Nanotechnology Reviews
·
2023
·Vol. 12
·期 1
·
IF 7.4
Wen-Juan Zhang,Ye-Zhi Ding,Ya-Xian Wang,You-Liang Wang,Yu-Long Fei,Meng-Yu Ran
The pollution of silver ion (Ag( i )) has become a serious environmental threat and hazard to ecosystem and human health. Thus, the nanoscale zero valent iron (nZVI)-doped polypyrrole-based carbon nanotube (nZVI/CNT) composites were synthesized by a facile method to remove Ag( i ) from wastewater due to the toxicity and scarcity nature of Ag( i ). In this process, Fe 3+ initiated the self-assembly of polypyrrole tubes in the presence of methyl orange, while it also served as an iron source generated nZVI/CNTs by carbothermal reduction method. The nZVI/CNT composites exhibited a homogeneous tubular structure, and the nZVI formed were uniformly dispersed in the nZVI/CNT composites. The nZVI/CNT composites were used as an adsorbent for the removal of Ag( i ) and showed a higher adsorption capacity compared to nZVI and CNTs, with a maximum adsorption capacity of 522.41 mg g −1 . Ag( i ) was adsorbed on nZVI/CNT composites by ion exchange and chelation, where Ag( i ) was reduced to non-toxic Ag due to the redox reaction among pyrrolic-N, nZVI, and Ag( i ). The adsorption process of Ag( i ) on nZVI/CNT composites was dominated by monolayer adsorption. According to our results, nZVI/CNT composites can be used as economical treatment for wastewater containing Ag( i ).
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 44
·e2307320120
·
IF 11.1
Yangyang Yu,Ye He,Ping Yan,Shengyao Wang,Fan Dong
The selective photocatalytic conversion of CO2 and H2O to high value-added C2H4 remains a great challenge, mainly attributed to the difficulties in C–C coupling of reaction intermediates and desorption of C2H4* intermediates from the catalyst surface. These two key issues can be simultaneously overcome by alloying Ag with Cu which gives enhanced activity to both reactions. Herein, we developed a facile stepwise photodeposition strategy to load Cu–Ag alloy sub-nanoclusters (ASNCs) on TiO2 for CO2 photoreduction to produce C2H4. The optimized catalyst exhibits a record-high C2H4 formation rate (1110.6 ± 82.5 μmol g−1 h−1) with selectivity of 49.1 ± 1.9%, which is an order-of-magnitude enhancement relative to current work for C2H4 photosynthesis. The in situ FT-IR spectra combined with DFT calculations reveal the synergistic effect of Cu and Ag in Cu–Ag ASNCs, which enable an excellent C–C coupling capability like Ag and promoted C2H4* desorption property like Cu, thus advancing the selective and efficient production of C2H4. The present work provides a deeper understanding on cluster chemistry and C–C coupling mechanism for CO2 reduction on ASNCs and develops a feasible strategy for photoreduction CO2 to C2 fuels or industrial feedstocks.
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Xiaoli Liu,Yanyi Fu,Qinglin Sheng,Jianbin Zheng
Herein, a simple electrochemical sensor for dopamine (DA) detection was developed based on Ag@C core-shell structure and Au nanocomposites (Ag@C/Au). The Ag@C core-shell nanoparticles were synthesized by one-pot hydrothermal method , which were supported on Au nanoparticles in situ reduction process. The as-prepared nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV–vis absorption spectra. The electrochemical investigations indicated that Ag@C/Au nanocomposites possessed intriguing properties towards DA. These results could be attributed to the synergistic effect of Ag@C with enhanced substrate accessibility and conductivity, Au nanoparticles with surface of negative charges. Under the optimum experimental conditions, the liner range was 0.5 μM to 27.5 μM, 27.5 μM to 0.2775 mM and 0.2775 mM to 4.278 mM. The detection limit was 0.21 μM (S/N = 3). Furthermore, the electrochemical sensor showed favorable selectivity in the presence of interferents such as ascorbic acid (AA) and uric acid (UA). In general, the work could provide a promising possibility to develop excellent electrochemical sensors for DA detection.
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CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Pengyu Zang,Yaqian Du,Chenghao Yu,Dan Yang,Shili Gai,Lili Feng,Shikai Liu,Piaoping Yang,Jun Lin
The newly developed thermoelectric dynamic therapy (TEDT) may not only solve the problem that photothermal therapy (PTT) is limited by the overexpression of heat shock proteins (HSPs) in tumor cells but also improve the killing effect through a dynamic process. Here, we propose photothermal-driven TEDT based on Ag–Ag2S nanoparticles that integrate Ag2S with Ag+ vacancies (VAg) and Ag in a Janus structure. VAg and Ag optimize the band structure and thermoelectric properties of Ag2S, and additional electrons from the introduction of Ag enhance the PTT effect and facilitates the construction of a significant thermoelectric field for electron–hole migration in the reverse direction, thereby markedly enhancing the TEDT effect. Furthermore, the generated VAg can also serve as a hole trap to suppress electron–hole recombination to promote 1O2 production, which inactivates HSPs to produce positive feedback on PTT, leading to better antitumor efficacy. The combined photothermal–thermoelectric therapeutic properties of Ag–Ag2S were verified from both in vivo and in vitro perspectives using ESR, UV–visible spectroscopy, cellular experiments, simulated tumor models, and other experiments.
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