RARE METALS
·
2021
·Vol. 41
·期 2
·630-638
·
IF 4.003
Qiu Jia-Jun,Yang Ting-Ting,Li Yi-Fan,Qian Wen-Hao,Liu Xuan-Yong
Although titanium and its alloys are extensively used in orthopedics and dentistry fields, implant failures still happen because of implant-associated infections. Herein, Au@Ag@Pt core–shell nanorods with noble metal combination were fabricated and assembled on medical titanium surface and the antibacterial activity and biocompatibility were investigated. The results showed that antibacterial rates of Ti–Au@Ag@Pt against S. epidermidis and P. aeruginosa were 89.7% and 92.7%, respectively. Besides, Ti–Au@Ag@Pt showed no obvious cell toxicity with MC3T3-E1 cells grew well on the sample surface. It was discovered that the Pt shell layer on Ti–Au@Ag@Pt slowed down the Ag ion release rate which endowed medical titanium surface with both antibacterial activity and good biocompatibility. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Shaofeng Zhang,Feng Ren,Wei Wu,Juan Zhou,Lingling Sun,Xiangheng Xiao,Changzhong Jiang
Composite photocatalysts that consist of semiconductor and noble metal nanostructures have been considered to be the promising and crucial materials for straightforward improving the efficiency in photocatalytic process and for the conversion of solar to chemical energy. In this work, we fabricated Ag-α-Fe 2 O 3 hybrid composites through a self-catalytic growth method by using the aldehyde-modified spindle α-Fe 2 O 3 nanoparticles (NPs) as supports. The size of supported Ag NPs can be directly controlled on the surface of α-Fe 2 O 3 . The morphology and structure of the resulting Ag-α-Fe 2 O 3 hybrid composites were studied by various techniques, including SEM, TEM, and XRD. The distinct photocatalytic behaviors were examined through the photodegradation of RhB dye. It was found that with the Ag NPs, the photocatalytic activities were enhanced greatly and the size of the Ag NPs played a crucial influence on the photocatalytic behaviors of the Ag-α-Fe 2 O 3 composites.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xin Zheng,Guanglei Li,Jingyi Zhang,Jie Zhang,Jian Yuan,Wenjing Yan,Peng Li,Changrui Xing
In this study, a planar benzothiazole Schiff base derivative ZX1 was designed and synthesized to selectively precipitate silver ions, in conjunction with the immunoassay detection of Hg 2+ ions. The silver chelation process was highly effective in the pH range of 7–10, with a silver ion precipitation ratio of 99.9 %. The coordination behavior of ZX1 with Ag + was studied using a series of spectroscopic measurements, topography analysis and DFT calculation. The shortest bond distances were 2.251 and 2.254 Å between nitrogen atom of thiazole and Ag + . Weak interactions were analyzed using the interaction region indicator (IRI) method and VMD. The immunoassay was developed through an anti-Hg 2+ /Ag + monoclonal antibody, which showed similar sensitivities for Ag + and Hg 2+ . The selectivity and anti-interference ability of the Schiff base ligands were tested for some hard metal ions and several anions. With co-existence of interference ion Ag + , Hg 2+ was detected in rice matrix solution with 77 %∼123.5 % recovery by addition of ZX1 as the masking reagent and 90.3 %∼115 % for wheat matrix. This research provides a promising immunoassay strategy for simultaneous detection of silver ions and mercury ions in food matrix by utilization of Schiff base ligands. This novel Schiff base ligand was then used as the pre-treatment reagent to remove silver ions within 5 min for detection of Hg 2+ or detection of both Ag + and Hg 2+ based on a novel bi-specific heavy metal antibody.
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高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Zelong Li,Xuemei Lin,Zengshan Yu,Guochao Shi,Wenying Zhou,Jiahao Cui,Shan Guo,Mingli Wang
Accurate and sensitive detection of bilirubin, cholic acid, and Alanine aminotransferase (ALT) is essential for the early detection of hepatobiliary diseases in healthcare and the medical field. Integrating surface-enhanced Raman scattering (SERS) with deep learning algorithm has shown great application prospect in the early identification of markers of hepatobiliary diseases. Here, an regular Ag decorated Cu-Ag nanoisland-liked SERS biosensor (Ag@5/Ag-Cu@20/PSS) was constructed by using pattered sappire substrate as a template. An additional 5 mins of Ag nanofilm significantly improved the SERS signal intensity and homogeneity, and the sensitivity was enhanced by two orders of magnitude up to 10-10 M for 4-aminothiophenol (4-ATP). Importantly, deep learning algorithms included temporal convolutional networks (TCN), convolutional neural networks (CNN), recurrent neural network (RNN) and Transformer were used to deeply mine SERS spectral data of bilirubin, cholic acid and ALT, extract effective features, and establish an accurate classification and prediction model. Results indicating that the developed SERS biosensor combined with Transformer model demonstrated excellent accuracy (ACC) of 0.9816±0.0090 in qualitatively and quantitatively analyzing of bilirubin, cholic acid, and ALT. The successful application of the SERS biosensor will help improve the accuracy of early identification of bilirubin, cholic acid, and ALT disease markers and promote the early intervention and treatment of hepatobiliary diseases.
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CELLULOSE
·
2021
·Vol. 28
·期 3
·1715-1729
·
IF 5.044
Liu Hongyu,Yang Lin,Zhan Yifei,Lan Jianwu,Shang Jiaojiao,Zhou Mi,Lin Shaojian
In this work, a durable and sunlight-driven self-cleaning superhydrophobic cotton fabric was developed as a multifunctional oil/water separation material. First of all, Ag/AgCl was successfully deposited on the polydopamine modified cotton fabric surface by electrostatic adsorption, then the Ag/AgCl loaded fabric was coated by the polydimethylsiloxane (PDMS) via simple dip-coating method. The as-prepared cotton fabric (PDMS-Ag/AgCl@CF) presented the superhydrophobic property with water contact angle about 155°. Meanwhile, the prepared PDMS-Ag/AgCl@CF exhibited great tolerance and resistance to broad pH and various organic solvents, and it can also withstand 50 cycles of abrasion or 60 min of ultrasound treatment without an apparent decrease of superhydrophobicity, indicating its outstanding mechanical durability. As expected, this durable superhydrophobic fabric can availably separate various oil/water mixtures by gravity-driven force with high separation efficiency (over 97.8%), and it possessed good reusability. Additionally, the PDMS-Ag/AgCl@CF exhibited an outstanding self-cleaning performance under sunlight irradiation, due to visible light photocatalytic performance of Ag/AgCl. Finally, the resultant cotton fabric displayed good antibacterial activity. Therefore, in consideration of its prominent comprehensive performances, it is expected that the PDMS-Ag/AgCl@CF can be used as a promising material for oily water remediation.
研究领域:
材料科学
·
环境科学
·
光催化
·
抗菌材料
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高影响因子
CELLULOSE
·
2014
·Vol. 21
·期 6
·4557-4567
·
IF 3.033
Feng Jin,Shi Qingshan,Li Wenru,Shu Xiulin,Chen Aimei,Xie Xiaobao,Huang Xiaomo
In order to improve the antimicrobial activity of bacterial cellulose (BC), the silver nanoparticles (Ag NPs) were in situ fabricated on the BC membranes, affording BC and Ag hybrid antimicrobial materials, BC + Ag, which possesses excellent antimicrobial performance. Typically, carboxyl groups were firstly introduced into BC by TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation. Then, the carboxyl-functionalized BC was performed with ion-exchange reaction to change the sodium ions into Ag + by immersing in AgNO 3 aqueous solution, generating Ag + anchored BC. Finally, two types of distinct reductive reagents including NaBH 4 and sodium citrate were employed to transform Ag + into Ag NPs to fabricate BC + Ag. The diameters of Ag NPs were determined to be 3.8 nm for NaBH 4 -reduced BC + Ag, and 22.0 nm for sodium citrate-reduced one, respectively. The silver content of BC + Ag were determined to be 1.944 and 2.895 wt% for NaBH 4 -reduced sample and sodium citrate-reduced one, respectively. Two types of BC + Ag both showed a slow and persistent Ag + release profile, but the NaBH 4 -reduced one released much more Ag + than that of sodium citrate under the same measurement condition. In-depth antibacterial analysis via the disc diffusion and colony forming count method disclosed that BC + Ag exhibited strong bactericidal effects against both Escherichia coli and Staphylococcus aureus . And the antibacterial activity of NaBH 4 -reduced BC + Ag was higher than the sodium citrate-reduced one. Overall, this study would further improve the antibacterial efficiency of BC + Ag.
研究领域:
材料科学
·
微生物学
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JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 11
·1-12
·
IF 2.533
Shen Xingwang,Xi Shuang,Xu Liang,Zhao Tao,Sun Rong,Li Junjie
A rising variety of power devices based on wide-bandgap (WBG) semiconductors are employed in products that can service at high temperatures consistently for extending the working life. Traditional tin–lead and lead-free solders are no longer suitable for power device packaging. Recently, nano-Ag pressureless sintering technology has attracted widespread attention for high-temperature application. When commercial Ag powders are applied, satisfactory sintering quality is often not obtained due to unstable product batches, unknown surface cladding, and poor sintering performance. In this work, Ag nanoparticles are surface modified with tert-dodecyl mercaptan (TDM) to prevent agglomeration at room temperature for improving pressureless sintering performance. We systematically introduced the modification process of Ag nanoparticles and Ag paste preparation and sintering process and compared the changes in the sintering performance of modified Ag nanoparticles with different TDM contents. With a minor amount of TDM, 1.5% of the total weight of Ag, the sintering performance of the Ag paste can be effectively improved and the porosity reduced. The highest average shear strength of the bonded joints based on modified Ag nanoparticles is up to 46.82 MPa with only 6.1% porosity by pressureless and low-temperature sinter at 250 °C for 10 min in ambient air, and the sintering morphology is better than the joints without nanoparticle modification. At the same time, increasing the sintering time does not have much effect on the bond strength, which indicated that 10 min already formed a high-quality joint. The analysis reveals that TDM molecules can be absorbed on the surface of Ag nanoparticles by headgroups to form a coating layer. The mechanism of TDM modification to enhance the sintering performance is also proposed, which provides theoretical support for the practical application of the pressureless Ag sintering technology. Graphical abstract
研究领域:
材料科学
·
纳米技术
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高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Chuncheng Wang,Hiroaki Tatsumi,Liang Xu,Tao Zhao,Pengli Zhu,Rong Sun,Hiroshi Nishikawa
Simplifying the bonding technique used to package power devices is crucial for electric vehicles and 5G communication. Herein, a transparent liquid Ag-based complex was employed to simplify the Ag sintering process. The complex can directly fabricate Ag nanostructures on substrates and dies by thermal decomposition at 180 °C for 30 min. These nanostructures consisted of linked nanoparticles with a wide size distribution and exhibited remarkable compressibility, indicating an excellent potential for sintering. Unlike traditional Ag paste, the Ag-based complex presented a single phase, and the obtained Ag nanostructures could be directly sintered at a low temperature. Robust sintered Ag joints with a high average shear strength of 45.4 MPa and a low porosity of 9.3% were successfully achieved by sintering at 300 °C and 5 MPa for 40 min. Such joint properties can be attributed to the frame–filler structure generated during sintering. This structure, which featured large Ag particles acting as frames and small Ag particles acting as bridges linking the frames, was beneficial for improving the sintering performance of the Ag nanostructures. The Ag-based complex could be used for the facile preparation of robust sintered Ag joints, creating possibilities for die attachment while reducing manufacturing costs.
研究领域:
材料科学
·
电子工程
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 12
·125601
·
IF 3.551
Qianyun Bin,Min Wang,Lishi Wang
In this work, silver nanoparticles (Ag NPs) were decorated into the cavities of ZIF-8 to fabricate a novel Ag NPs/ZIF-8 modified glassy carbon electrode (GCE) for electrochemical sensing of chloride ion. Benefiting from the synergistic properties of ZIF-8 and Ag NPs, the Ag NPs/ZIF-8/GCE showed favorable performance towards chloride ion. For comparison, the electrochemical activity of Ag NPs wrapped by ZIF-8 (Ag NPs@ZIF-8) and Ag NPs coating on ZIF-8 (Ag NPs-on-ZIF-8) were also investigated and it was found that Ag NPs/ZIF-8 possessed the best performance. Some experimental parameters including pH of the supporting electrolyte and scan rate were also investigated. Under optimal conditions, the proposed sensor exhibited excellent stability, reproducibility and selectivity for the determination of chloride ion with a wide linear detection range from 5 to 4000 μmol dm−3 and a low detection limit of 0.61 μmol dm−3 (S/N = 3). The proposed sensor was successfully applied to the determination of chloride ion spiked in human serum. All these results indicated that the developed Ag NPs/ZIF-8/GCE sensor was superior.
研究领域:
材料科学
·
分析化学
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Ling Zhou,Xiaojun Wen,Yuanzhi Min,Jiafeng He,Lijun You,Jumei Li
In situ and real time monitoring chemical reactions has been subjected to widespread concern in many areas. Herein, a novel and efficient SERS platform constructed from coating mesoporous ZrO 2 (mZrO 2 ) interlayer onto an Ag core and subsequently depositing outer Ag nanoparticles was successfully fabricated. The Ag@mZrO 2 @Ag nanocomposite exhibited an ultrahigh SERS sensitivity as well as remarkably photocatalytic property assisted by a plenty of Ag nanoparticles on the outer surface and photoactive mZrO 2. Experimental results proved the limit of detection of Cr(VI) was down to 10 −8 M and the good linearity dependence of SERS intensities on the logarithm of concentration (R 2 = 0.93) was obtained. Moreover, a simple SERS method was used to in situ monitor the photocatalytic reduction of Cr(VI) under visible light (λ > 420 nm). In addition, as practical SERS substrates, Ag@mZrO 2 @Ag nanocomposites presented outstanding signal reproducibility and remarkable storing stability. As a consequent, this study came up with a new strategy for in situ monitoring photocatalytic reactions and will be possibly utilized in chemical sensing and ecological restoration in the future.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Ling Zhang,Yiquan Xie,Yiwen Jiang,Yaobin Li,Chunying Wang,Shichao Han,Huimin Luan,Xiangju Meng,Feng-Shou Xiao
Catalytic combustion at low temperature has been considered as an effective route for removal of indoor HCHO pollutant, and conventional catalysts are supported noble metal nanoparticles, which are costly for wide applications. Solution of this issue is to use relatively low metal catalysts. Herein, we report that Mn-promoted Ag catalyst supported on pure silica Beta zeolite with a good hydrophobicity is very active for catalytic combustion of HCHO. By optimizing the loadings of Ag and Mn, it is found that 10 wt% Ag with 8 wt% Mn (10 %Ag8 %Mn/Beta-Si) exhibits highest activity, giving the complete HCHO conversion at around 45 °C, which steadily outperform the temperatures (70–145 °C) for full oxidation of HCHO reported previously. The choice of Ag loading with 10 wt.% is due to the highest exposed surface of Ag sites, and the use of Mn loading with 8 wt% is assigned to the balance of density and mobility for active oxygen species in the catalysts. The strategy combining the hydrophobic supports with optimized active oxygen species might offer an alternative way to develop highly efficient heterogeneous catalysts for the removal of air pollutants in the future.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Jian Zhu,Zai-jie Xu,Guo-jun Weng,Jing Zhao,Jian-jun Li,Jun-wu Zhao
In this report, Ag-dielectric-Au three-layered nanoshells with controlled inner core size were synthesized. The fluorescence emission of the rhodamine 6G (R6G) could be quenched by the three-layered nanoshells distinctly. What's more, the fluorescence quenching efficiency could be further improved by tuning the etching of inner Ag nanosphere . The maximum fluorescence quenching efficiency is obtained when the separate layer just appears between the inner Ag core and the outer Au shell. Whereas the fluorescence quenching efficiency is weakened when no gaps take place around the inner Ag core or the separate layer is too thick and greater than 13 nm. The fluorescence quenching properties of the Ag-dielectric-Au three-layered nanoshells with different initial sizes of the Ag nanoparticles are also studied. The maximum fluorescence quenching efficiency is obtained when the three-layered nanoshells are synthesized based on the Ag nanoparticles with 60 nm, which is better than others two sizes (42 and 79 nm). Thus we believe that the size of initial Ag nanospheres also greatly affects the optimized fluorescence quenching efficiency. These results about fluorescence quenching properties of Ag-dielectric-Au three-layered nanoshells present a potential for design and fabrication of fluorescence nanosensors based on tuning the geometry of the inner core and the separate layer.
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高影响因子
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