JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dan Guo,Yingjie Huo,Congpu Mu,Bochong Wang,Jianyong Xiang,Anmin Nie,Kun Zhai,Tianyu Xue,Fusheng Wen,Zhongyuan Liu
Multifunctional materials have attracted tremendous attention owing to their applications in military, healthcare and medical therapy, intelligent and wearable devices . Herein, multifunctional sandwich structure composite film consisting with aramid nanofiber (ANF), silver nanowires (AgNWs) and graphene nanosheets (GNs) is fabricated via a facile vacuum filtration following a hot-pressing method, which is applied in electromagnetic interference (EMI) shielding and Joule heating. ANF/AgNWs/GNs (AAG) sandwich structure composite film not only realizes excellent EMI shielding performance but also possesses outstanding Joule heating property due to with high electrical conductivity owing to AgNWs network layer. EMI shielding and Joule heating performance of AAG composite films are gradually enhanced with increasing the mass ratio of AgNWs, which can be attributed to the increase of electrical conductivity. When the mass of AgNWs is increased to 30 mg, AAG-24 g m −2 composite film with thickness of 40 µm displays a superior EMI shielding effectiveness of 68.3 dB and specific shielding effectiveness of 16,545.4 dB cm −2 g −1 . In addition, the surface temperature of AAG-24 g m −2 film reaches approximately 133 °C at a low working voltage of 3.0 V. This work introduces that the multifunctional sandwich structure composite films with an excellent EMI shielding and Joule heating performance have a huge potential application for numerous actual fields.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Guojun Weng,Xun Shen,Jianjun Li,Jingyuan Wang,Jian Zhu,Junwu Zhao
The etching of gold nanorods/nanobipyramid, or silver-coated nanorods/nanobipyramid inducing plasmon changes represents an efficient strategy to improve the performance of enzyme-linked immunosorbent assay (ELISA). However, the effect of shape on the sensitivity was negligible, especially the thickness of coated silver shell. Here, we propose a plasmonic ELISA for multi-colorimetric detection of CRP based on the etching of Ag-coated Au nanobipyramid (Au [email protected] ). The effect of silver shell thickness on the sensitivity of plasmon peak shifting was investigated by experiments and DDA calculations. The relationship between the Ag shell thickness and the sensitivity of plasmon peak shifting was obtained. Our results reveal that the thickness of coated Ag shell acts as a key factor in the multi-color change of Au [email protected] etching. It is found that Au [email protected] with medium Ag shell thickness and rod-like shape has the higher sensitivity and is suitable for sensing. At the optimized most sensitive Ag shell, the detection limit of proposed plasmonic ELISA for CRP was determined to be 0.09 ng/mL with a spectrometer in the range from 0.09 ng/mL to 25 ng/mL. Importantly, the visual detection limit was 0.78 ng/mL, which allows the differential diagnosis with the naked eye. Compared with traditional ELISA with the monochromatic intensity variations, the multi-color ELISA proposed in this study has a large linear range and rich color variation for high-sensitivity and naked-eye semi-quantitative detection.
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Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Zhang Hanyuan,Xu Jianxiang,Zhang Xu,Wang Teng,Zhou Dairan,Shu Wei,Zhao Tingting,Fang Weijun
Developing drug delivery nanosystems with both anticancer and antibacterial effects is of great clinical value. Herein, we report a facile approach to synthesize Ag and quaternary ammonium salt (QAS) co-decorated mesoporous silica nanoparticles (MSNs), namely, Ag/QAS-MSNs, for synergistic treatment of cancer and bacterial infections. In vitro studies demonstrated that Ag/QAS-MSNs not only had a strong antibacterial activity against the bacterial pathogens but also could efficiently induce cancer cell death through an apoptotic pathway. Moreover, in vivo combination therapy with Ag and QAS in Ag/QAS-MSNs was also tested in a nude mouse tumor model, and a significant synergistic anticancer effect, which is superior to that obtained by therapy with Ag-MSNs or QAS-MSNs alone, was achieved. Such excellent anticancer and antibacterial activity of Ag/QAS-MSNs could be attributed to the synergistic effect of Ag ions and QAS. Thus, Ag/QAS-MSNs have a promising future as potent anticancer agents with high antibacterial performance.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yan-ling Liu,Jian Zhu,Guo-jun Weng,Jian-jun Li,Jun-wu Zhao
Herein, we reported a robust and sensitive SERS sensing platform based on hollow porous pentagonal Au/Ag alloy nanotubes (Au/AgANTs) for simultaneous determination of three food contaminants. With the increase amount of etching agent, the morphology of the nanoparticles changed from solid to hollow porous structures , and then the disappearance of pores, accompanied by a trend of first increasing and then decreasing SERS activity. The Au/AgANTs with pentagonal cross section, hollow and pore structure provide stronger local electric field. Under optimized experimental conditions, they were utilized to achieve the simultaneous determination of rhodamine B (RhB), methylene blue (MB) and malachite green (MG) in shrimp paste with low detection limit (5.3 ×10 −11 M for RhB, 1.27 ×10 −10 M for MB and 4.07 ×10 −12 M for MG), wide linear detection range (1.0 ×10 −8 ∼1.0 ×10 −4 M for RhB, 1.0 ×10 −9 ∼1.0 ×10 −5 M for MB, and 1.0 ×10 −9 ∼1.0 ×10 −5 M for MG) and satisfactory recoveries (97.24–102.66%), suggesting that the developed method is a promising tool for accurate quantification of the three food contaminants at trace level.
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Nanoscale
·
2022
·Vol. 14
·期 34
·12313-12321
·
IF 8.307
Yanying Cui,Linan Xu,Haitao Li,Xuan Wang,Fuwei Sun,Huan Wang,Xinguang Guo,Yihe Zhang,Hongbo Gao,Qi An
Surface-enhanced Raman scattering (SERS) is a rapid and promising detection technique for trace molecules. A central goal of research in this area is to achieve the highly sensitive detection of molecules built on a systematic understanding of enhancement mechanisms. Herein, we develop a Ag cluster@rGO composite nanostructure, which utilizes strong molecular adsorption to achieve ultrahigh SERS sensitivity. Ag clusters are prepared without additional reducing agents, leaving a low carbon footprint in the fabrication process. Finite-difference time-domain (FDTD) simulations show strong electromagnetic field enhancements generated at the edges and interstices of Ag clusters due to the specificity of their structure. Density Functional Theory (DFT) calculations show that the HOMO–LUMO energy gap value is significantly reduced when Ag cluster@rGO forms a composite system with the target molecule, which enables efficient charge transfer between the substrate and molecules, resulting in charge transfer enhancement. A detection limit of 10−14 M using our substrate can be achieved for the environmental pollutant dye rhodamine 6G (Rh6G). The detection limits of bisphenol A (BPA) and its derivatives reach nanomolar levels with good signal stability. More importantly, we demonstrate the ability to rapidly screen BPA migration in Chinese Baijiu. Our SERS platform can be further developed for environmental pollution control and food safety.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Jie Liu,Ziqian Wang,Qiuliang Wang,Kailai Zhang,Yali Luo,Yunfei Liu,Yinong Lyu,Bei Huang
Porous carbon with abundant nitrogen doping (C-PCTF) was obtained by using porphyrin-based covalent triazine framework (PCTF) as the carbonization precursor. As expected, C-PCTF inherits the porous structure and the chemical composition of the PCTF . Due to the high surface area and accessible nitrogen sites, the carbon material can be employed as a superior supporting substrate to immobilize Au and Ag nanoparticles . Both the Au@C-PCTF and Ag@C-PCTF nanocatalysts show good catalytic activity in the reduction of 4-nitrophenol. Especially for Ag@C-PCTF, the catalytic activity is higher than most of other metal-catalysts reported previously. This study would provide a new strategy to use various porous organic polymers in fabricating carbon-supported heterogeneous catalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Juanjuan Luo,Zekai Wang,Yun Li,Changding Wang,Jiefang Sun,Weichun Ye,Xiaolong Wang,Bing Shao
Swab sampling for the trace surface-enhanced Raman scattering (SERS) analysis of an aromatic dye (e.g., malachite green , MG) residue in fruits as well as fingerprints is promising due to its practical utility and efficiency in food security and forensic science. However, the durability and recyclability of the SERS substrates pose an enormous challenge. In this study, a novel flexible film was constructed by embedding a commercial Ag nanowire suspension into a polydimethylsiloxane film (Ag [email protected] ), which simultaneously exhibits SERS activity, durability and recyclability. High SERS performance was still maintained, even against 20 times stretchability, corrosion by HNO 3 , destruction by ultrasonication and a broad working temperature of −20 ℃ to 80 ℃. Excellent recyclability for MG sensing was achieved in ten cycles. Ag [email protected] was successfully used for the quantitative detection of MG in juices of fruits (such as apple and pear) by drop dripping, with a limit of detection of 10 nM and good anti-interference. Meanwhile, the sensitive detection of the MG residue (only 3 ng/cm 2 ) on fruits was enabled by the on-site surface swabbing by recycling for five cycles. Portable detection of the MG residue was further achieved from the 10th fingerprint after successively touching a dye drop onto the functional film combined with a portable Raman spectrometer.
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JOURNAL OF FLUORESCENCE
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2021
·Vol. 31
·期 6
·1947-1957
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IF 2.217
Shu Yun,Dai Tao,Ye Qiuyu,Jin Dangqin,Xu Qin,Hu Xiaoya
Using two-dimensional (2D) nickel-based metal organic framework (Ni-MOF) nanosheets as a matrix, Eu 3+ and Ag + were incorporated to synthesize Ag/Eu@Ni-MOF with double luminescence centers of Eu 3+ ion (615 nm) and organic ligand (524 nm). And a ratiometric luminescence sensor is constructed based on Ag/Eu@Ni-MOF for sensitive detection of biothiols in aqueous solutions. The dual-emissive fluorescence properties can be tuned by changing the amounts of Ag + ions doping. The results of temperature and pH effects on the fluorescence of Ag/Eu@Ni-MOF indicates that the Ag/Eu@Ni-MOF is a temperature-sensitive material and the fluorescence of Ag/Eu@Ni-MOF can keep stable over a wide pH range. Due to the binding of -SH in cysteine (Cys) and glutathione (GSH) with Ag + , the ligand luminescence was significantly inhibited by weakening the Ag + influence on the energy transfer process in the MOFs. Therefore, ratiometric fluorescent sensing of biomolecular thiols was realized based on the dual-emission Ag/Eu@Ni-MOF. More importantly, the fluorescence color change can be observed with naked eyes to realize visual detection. The ratiometric fluorescent sensor exhibits high performance for Cys and GSH detection with a wide linear range of 5-250 µM and a relatively low detection limit of 0.20 µM and 0.17 µM, respectively. Furthermore, the biothiols content in human serum was determined with satisfactory results. It proves the Ni-MOF nanosheets can be used as a stable matrix for construction luminescent MOFs for the first time, and validate the great potential of Ag/Eu@Ni-MOF as a ratiometric fluorescent probe for point-of-care testing (POCT) in disease diagnosis.
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MOLECULES
·
2021
·Vol. 26
·期 22
·6790
·
IF 4.412
Jikai Mao,Lvtao Huang,Li Fan,Fang Chen,Jingan Lou,Xuliang Shan,Dongdong Yu,Jianguang Zhou
Direct detection of long-strand DNA by surface-enhanced Raman scattering (SERS) is a valuable method for diagnosis of hereditary diseases, but it is currently limited to less than 25-nt DNA strand in pure water, which makes this approach unsuitable for many real-life applications. Here, we report a 60-nt DNA label-free detection strategy without pretreatment by SERS with polyquaternium-modified Ag microcrystals derived from an AgCl cube. Through the reduction-induced decomposition, the size of the about 3 × 3 × 3 μm3AgCl cube is reduced to Ag, and the surface is distributed with the uniform size of 63 nm silver nanoparticles, providing a large area of a robust and highly electromagnetic enhancement region. The modified polycationic molecule enhances the non-specific electrostatic interaction with the phosphate group, thereby anchoring DNA strands firmly to the SERS enhanced region intactly. As a result, the single-base recognition ability of this strategy reaches 60-nt and is successfully applied to detect thalassemia-related mutation genes.Keywords:60-nt DNA direct detection;surface-enhance Raman scattering;Ag microcrystal;polycationic
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiawei Mao,Tianping Huang,Subrata Panda,Jianxin Zou,Wenjiang Ding
In this work, Mg(In) and Mg(Ag) solid-solution ultrafine particles were successfully synthesized by using a direct current (DC) arc-plasma method and their hydrogen storage and hydrolysis behaviors were thoroughly investigated. In particular, microstructural analyses clearly reveal that MgH 2 @MgIn and MgH 2 @MgAg composites are autogenerated upon hydrogenation via the formation of nano MgIn or MgAg intermetallic phase on MgH 2 : Mg(In/Ag) + H 2 ⟷ MgH 2 + MgIn/MgAg. Upon dehydrogenation, in-situ TEM observations confirm that the reverse reaction occurs through the diffusion of In/Ag from the MgIn/MgAg phase to MgH 2 . Such a diffusion process is coupled with the decomposition of MgH 2 , leading to the microstructural transition from MgH 2 @MgIn or MgH 2 @MgAg to corresponding solid solutions. For Mg-In system, the discovery of the intermediate phase Mg 3 In through in-situ TEM observation indicates that the dehydrogenation process is a two-step reaction dominated by the diffusion of In. Meantime, the improved hydrolysis performances of the MgH 2 @MgIn and MgH 2 @MgAg composites are primarily attributed to the direct participation of MgIn/MgAg in the hydrolysis reaction, providing more active sites for accelerating hydrogen yield. Therefore, the introduction of In or Ag into Mg has provided with noticeable improvements in the hydrogen storage as well as the hydrolysis properties of MgH 2 .
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BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Keqin Deng,Jing Xiao,Zhang Liu,Chunxiang Li,Jinglun Wang,Qingfeng Yi,Haowen Huang,Hu Zhou
ABSTRCT Photocathode-based assay is anti-interference for real sample detection . Photocathode produces low photocurrent signal and gives rise to poor sensitivity. Herein, a novel cathode photoelectrochemical (CPEC) sensing platform based on Ag-AgI-CNTs as photocathode material and K 3 [Fe(CN) 6 ] as photoelectron acceptor was established. Since [Fe(CN) 6 ] 3- effectively accepted photoelectrons from Ag-AgI-CNTs, it greatly enhanced the CPEC response. Combining a surface multisite strand displacement amplification (SMSDA) strategy, the CPEC platform was applied for the activity assay of terminal deoxynucleotidyl transferase (TdT). In this proposal, oligo dT primer tethered on CPEC platform was in-situ extended to generate a polyA tail. Then the polyA tail formed a stable multi-point hybrid structure with the adjacent oligo dT. After launching the SMSDA, the CPEC platform was covered by more elongated polynucleotide chains and network, which acutely hampered the photoelectron transfer (eT) between photocathode and electron acceptor and caused a reduced photocurrent. The CPEC sensor possessed a satisfactory linear response from 6 × 10 -5 -0.1 U and a low detection limit of 1.1 × 10 -5 U. The strategy offered a more specific and sensitive method for TdT activity assay . It was feasible in the field of TdT-based biochemical research, drug screening, and disease diagnosis.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 10
·13305-13322
·
IF 2.478
Gu Yufen,Guo Bobo
Here, the novel Ag 2 MoO 4 /Bi 2 WO 6 (AMO/BWO) heterojunction composite photocatalysts were synthesized based on the combination (co-precipitation method + hydrothermal method) XRD, XPS, SEM, TEM, UV–Vis DR spectroscopy, PL spectroscopy, FTIR spectroscopy, as well as EIS analyses were employed to characterize the photocatalysts, and photocurrent response was utilized to confirme the formation of Z-type heterojunction. The generation and transfer of electron/holes in the AMO/BWO heterojunctions excited by simulated sunlight were analyzed. Under simulated sunlight, the photocatalytic performance of AMO/BWO composites were studied by degradation of organic pollutants. The experimental results show that the 30 wt% AMO@BWO is the best photocatalytic composite material among all samples and the degradation rate reached 98.6%. Due to the prolonging of lifetime of the photoexcited electrons in the CB of AMO and holes in the VB of BWO, these carriers are more effective to participate in photodegradation reactions. An electron/hole transfer mechanism of the Z-scheme heterojunctions is proposed to illustrate the enhanced photodegradation performance of the AMO/BWO composite samples.
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