Journal of Materials Chemistry B
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2022
·Vol. 10
·期 15
·2944-2951
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IF 7.571
Xiaoying Zhang,Xin Wang,Peng Wang,Qiuyue Fu,Zhaozhen Zhu,Chaocai Luo,Jieyi Chen,Yanjiao Zhang,Shaoxin Li
The surface-enhanced Raman scattering (SERS) technique has attracted increasing attention in biomedicine due to the capability of providing the molecular fingerprint information of biosamples. Two-dimensional (2D) metal nanohybrids have proven to be efficient SERS substrates for bioanalysis due to the cooperative Raman enhancement mechanism. Herein, a facile strategy for the fabrication of a novel transition metal telluride-based 2D-metal SERS substrate is proposed. Ag-niobium ditelluride (NbTe2) nanocomposites are synthesized through in situ reduction of Ag nanoparticles on NbTe2 nanosheets (NSs). The excellent SERS performance of Ag–NbTe2 NSs probably originates from the coupling effect of enhanced electromagnetic field distribution around the plasmonic nanostructure (hot spots) and the charge transfer caused by the semiconductor material after numerical simulations. Using Ag–NbTe2 NSs as an ultrasensitive SERS probe, the molecular components of three types of muscle tissues are clearly identified. An effective classification of skeletal, cardiac and smooth muscles is also realized according to their SERS data plus principal component analysis. In addition, the monitoring of the skeletal muscle stretching process is achieved by the Ag–NbTe2 NS-based SERS analysis, which represents a powerful tool for molecular exercise physiology.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2022
·Vol. 23
·期 19
·11197
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IF 6.208
Xiaoxiao He,Xiaohong Ma,Yujun Yang,Xi Hu,Teng Wang,Shiyue Chen,Xiang Mao
In this work, we firstly report the preparation of heterogeneously assembled structures Au-Ag nanoclusters (NCs) as good drug carriers with high loading performance and biocompatible capability. As glutathione-protected Au and Ag clusters self-assembled into porous Au-Ag NCs, the size value is about 1.358 (±0.05) nm. The morphology characterization revealed that the diameter of Au-Ag NCs is approximately 120 nm, as well as the corresponding potential ability in loading performance of the metal cluster triggered-assembling process. Compared with individual components, the stability and loading performance of heterogeneous Au-Ag NCs were improved and exhibit that the relative biocompatibility was enhanced. The exact information about this is that cell viability was approximately to 98% when cells were incubated with 100 µg mL−1particle solution for 3 days. The drug release of Adriamycin from Au-Ag NCs was carried out in PBS at pH = 7.4 and 5.8, respectively. By simulating in vivo and tumor microenvironment, the release efficiency could reach over 65% at pH = 5.8 but less than 30% at pH = 7.2. Using an ultrasound field as external environment can accelerate the assembling process while metal clusters triggered assembling Au-Ag NCs. The size and morphology of the assembled Au-Ag NCs can be controlled by using different power parameters (8 W, 13 W, 18 W) under ambient atmosphere. Overall, a novel approach is exhibited, which conveys assembling work for metal clusters triggers into heterogeneous structures with porous characteristic. Its existing properties such as water-solubility, stability, low toxicity and capsulation can be considered as dependable agents in various biomedical applications and drug carriers in immunotherapies.Keywords:Au-Ag NCs;heterogeneous structures;assembling;drug carriers;biocompatibility
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Hongji Li,Junfu Wang,Xiyue Wang,Haochen Yu,Linjing Ji,Tianyu Zhou,Chunbo Liu,Guangbo Che,Dandan Wang
In this test, the eggshell membrane (ESM) is selected as the support membrane for the biocompatibility and anchors CNTs on the surface to increase the mechanical properties. Then Ag NPs are decorated on CNTs-ESM substrate as SERS substrate by twice in-situ reduction. Finally, a layer of imprinted polymers is coated on the surface of the substrate to synthesize the imprinted membrane for selective detection of spiramycin. It is exhibited from the characteristic results that the CNTs significantly increase the mechanical properties and the detection sensitivity, simultaneously. When the concentration of SP changes between 10 -6 ∼ 10 -11 M, there is a linear relationship between SERS intensity and SP concentration. The detection limit is 10 -11 M, and the correlation coefficient R 2 is 0.9864. The SERS imprinted membrane can be applied into the detection of antibiotics in practical sample, which broadens the research field of antibiotics detection.
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NPG Asia Materials
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2022
·Vol. 14
·期 1
·1-8
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IF 10.761
Shi Wei,Yao Qin,Donghui Wang,Qu Sanyin,Chen Yanling,Lee Kyu Hyoung,Chen Lidong
Nonferric oxidant precursors have the unique advantage of directly polymerizing poly(3,4-ethylenedioxythiophene) (PEDOT)-inorganic composites. However, due to limited solubility and unmatched oxidation potentials, most oxidants only produce powders or porous materials. To obtain high-quality films with improved homogeneity and controllable particle sizes, the oxidants should be adaptable to high-standard PEDOT film fabrication techniques such as vapor phase polymerization (VPP). In this work, we discovered for the first time a nonferric metal salt suitable for the VPP process. With the addition of an Fe(III) salt to stabilize the reaction and adjust the oxidant ratio, micron-thick antibacterial S-PEDOT-Ag quantum dot (QD) composite films with tunable Ag wt% can be synthesized in one facile step. With a low Ag loading of ~0.2 wt%, the film exhibited an optimized power factor of 63.1 μW/mK 2 , which is among the highest values thus far reported for PEDOT-metal composites. Increase of the Ag(I) concentration in the precursor to a certain level may lead to minor decomposition of the polymer followed by the formation of Ag 2 S particles.
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Nanomaterials
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2022
·Vol. 12
·期 13
·2152
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IF 5.719
Chunhong Zhang,Hao Ren,Xiangkui Jiang,Guangfeng Jia,Zhigang Pan,Yongchun Liu
An aggregation or assembly of Ag triangular nanoplates (Ag TNPs) can cause dramatic changes in their optical properties, which is widely used in applications in the field of sensing. The assembly forms of nanoparticles are crucial for obtaining sensitive sensing signals, but it is unknown what kind of assembly dominates the aggregated Ag TNPs in aqueous solutions. Herein, using thiram-induced Ag TNP aggregation as a model, six different assembly models were established, including three planar (side-by-side, side-to-tip, and tip-to-tip) assemblies and three tridimensional (plane-to-plane, plane-to-tip, and plane-to-side) assemblies. The corresponding optical properties were then investigated. Both theoretical and experimental findings indicate that three-dimensional assemblies, especially plane-to-plane assembly, dominate the Ag TNPs aggregation solution, causing a blue shift of the absorption spectrum. Analysis of charge distribution patterns in Ag TNPs indicates that such a blue shift is caused by the electrostatic repulsive force in plane-to-plane assembly. Thus, we propose a simple colorimetric method for thiram detection using Ag TNPs as an indicator. The method exhibits a selective and sensitive response to thiram with a limit of detection of 0.13 μM in the range of 0.2–0.5 μM, as well as excellent performance in real samples like wheat.Keywords:aggregation;Ag triangular nanoplates;LSPR;colorimetric detection;thiram
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MOLECULES
·
2022
·Vol. 27
·期 12
·3939
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IF 4.927
Yazhou Qin,Fan Mo,Sen Yao,Yuanzhao Wu,Yingsheng He,Weixuan Yao
Porous noble metal nanomaterials have attracted extensive attention due to their high specific surface area and surface plasmon resonance effect. However, it is difficult to form porous structures due to the high mobility and low reduction potential of noble metal precursors. In this article, we developed a facile method for preparing porous Ag with a controllable structure at room temperature. Two kinds of Ag crystals with different porous structures were successfully prepared by using AgCl cubes as sacrificial templates. Through the galvanic replacement reaction of Zn and AgCl, Ag crystals with a sponge-like porous structure were successfully prepared. Additionally, using NaBH4as the reducing agent, we prepared granular porous Ag cubes by optimizing the amount of reducing agent. Both the sponge-like and granular porous Ag cubes have clean and accessible surfaces. In addition, we used the prepared two porous Ag cubes as substrate materials for SERS detection of five kinds of methamphetamine analogs. The experimental results show that the enhancement effect of granular porous Ag is better than that of sponge-like porous Ag. Furthermore, we probed the hot spot distribution of granular porous Ag by Raman mapping. By using granular porous Ag as the substrate material, we have achieved trace detection of 5 kinds of methamphetamine analogs including Ephedrine, Amphetamine, N-Methyl-1-(benzofuran-5-yl)propan-2-amine (5-MAPB), N-Methyl-1-(4-methoxyphenyl)propan-2-amine (PMMA) and N-Methyl-1-(4-fluorophenyl)propan-2-amine (4-FMA). Furthermore, to achieve qualitative differentiation of analogs with similar structures we performed density functional theoretical (DFT) calculations on the Raman spectra of the above analogs. The DFT calculations provided the vibrational frequencies, Raman activities, and normal mode assignment for each analog, enabling the qualitative differentiation of the above analogs.Keywords:Ag crystal;methamphetamine;SERS;porous structure
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Polymer-Plastics Technology and Materials
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2022
·
IF 2.439
Yuxian Su,Teng Li,Yingyan Mao,Li Liu,Shipeng Wen
Natural rubber (NR) latex gloves serve as a very important barrier protection for health care workers. It is of great significance to study the barrier and antibacterial properties of NR latex products. Herein, a small amount of graphene oxide (GO) with in situ grown silver (Ag) nanoparticles was self-assembled in the NR latex by carboxymethyl chitosan (CMCS) as a cross-linking agent to form a novel NR/GO-Ag-CMCS composite with three-dimensional filler networks. The filler networks in the NR/GO-Ag-CMCS composite were formed by a strong interfacial interaction between NR macromolecules and GO-Ag-CMCS hybrids. The tensile strength and tear strength of NR/GO-Ag-CMCS composite were higher than those of pure NR film. With the increase of GO content, the filler network of NR/GO-Ag-CMCS film tended to be more complete and its barrier was stronger. Moreover, the NR/GO-Ag-CMCS composite showed excellent antibacterial performance against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The minimal inhibitory concentration values of GO-Ag-CMCS hybrid to E. coli and S. aureus were 8 and 16 μg/mL, respectively. For the NR/GO-Ag-CMCS composite with 0.1 phr GO, the diameters of its inhibition zone were 15.6 mm for E. coli and 13.6 mm for S. aureus.
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Chaochao Gao,Wen Yu,Minghao Du,Bingxuan Zhu,Wanbao Wu,Yihong Liang,Dong Wu,Baoyu Wang,Mi Wang,Jiaheng Zhang
The development of graphene conductive inks with a high conductivity and dispersion stability in water poses considerable challenges. Herein, a highly conductive Ag/carbon quantum dots (CQDs)/graphene (G) composite with good dispersity and stability in water was prepared for the first time through the in situ photoreduction of AgNO3 and deposition of Ag onto graphene nanosheets obtained via CQD-assisted liquid-phase exfoliation. Ag nanoparticles with an average size of ∼1.88 nm were uniformly dispersed on graphene nanosheets. The Ag/CQDs/G composite exhibited good dispersity and stability in water for 30 days. The formation mechanism of the Ag/CQDs/G composites was also discussed. CQDs played a vital role in coordinating with Ag+ and reducing it under visible light conditions. The addition of only 1.58 wt % of Ag NPs to the CQDs/G film resulted in a significant decrease in the electrical resistivity by approximately 89.5%, reaching a value of 0.054 Ω cm for a 40 μm thick Ag/CQDs/G film. A low resistivity of 2.15 × 10–3 Ω cm for the Ag/CQDs/G film was achieved after rolling compression with a compression ratio of 78%. The Ag/CQDs/G film exhibited good conductivity and durability when bent, rolled, or twisted. Moreover, the resistivity of the film displayed a slight deviation after 5000 bending cycles, indicating its outstanding stability. This study provides an efficient strategy for preparing graphene-based conductive composites with good dispersibility and stability in water as well as novel high-performance conductive inks for application in flexible printed electronics.
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Materials Today Communications
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2022
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IF 3.662
Zicheng He,Yunjie Lin,Mingfu Ye,Wenqing Zhu,Guochang Chen
The bismuth-containing semiconductors have emerged as promising materials for the degradation of organic pollutants and reduction of CO 2 . However, their potential applications in photocatalytic H 2 generation have not been explored clearly. Herein, bismuth-containing multicomponent photocatalyst Ag-BWV-y (where y represents the moles of Ag + in the initial reaction system) has been synthesized by a simple one-pot chemical method for photocatalytic H 2 generation. The element Ag is homogeneously distributed in as-prepared nanocomposite, and the band structure of Ag-BWV-y can be tuned by the dosage of Ag + ions. The optimized photocatalyst Ag-BWV-y (y = 0.15) shows a maximum H 2 evolution rate of 652 μmol h −1 g −1 , which is about 5.6-fold that of undoped sample. The narrow band gap of Ag-BVW-0.15 favors the photocatalytic activity in promoting H 2 production.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Wenxian Wei,Dan Yu,Yu Du,Yicheng Ding,Qingli Huang
Au-Ag alloy nanoparticles (NPs) with controllable size and composition were synthesized by a facile, one-pot hydrothermal method. Various characterization techniques including TEM, UV–vis, EDX, HAADF-STEM and XPS were used to discuss the influencing factors for the size and composition of Au-Ag alloy NPs. It is obvious that the size and composition of Au-Ag alloy NPs could be adjusted by the experimental parameters. Catalytic and SERS performance of the Au-Ag alloy NPs were further investigated. Ideal catalytic and SERS performance could be also obtained via optimizing the size and composition of Au-Ag alloy. This work is of importance in theory research and practical application of the noble metal nanocomposites.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Ping-An Yang,Yuxuan Huang,Rui Li,Xin Huang,Haibo Ruan,Mengjie Shou,Wanjun Li,Yuxin Zhang,Nan Li,Lichao Dong
Ag-coated Fe (Fe@Ag) core–shell nanowires (NWs) with enhanced electromagnetic wave absorption were successfully synthesized by the liquid-phase reduction method and the layer-plus-island growth mode. Changing the molar ratio of Fe to Ag controlled the Ag shell thickness to produce different impedance matching and attenuation constants of the Fe@Ag core–shell NWs. The Fe@Ag core–shell NWs with a Fe:Ag ratio of 2:1 significantly improved optimal microwave absorption performance as compared to raw Fe NWs. At a mass fraction of 25%, the minimum reflection loss (RL min ) can reach − 58.69 dB at 7.53 GHz with a matching absorber thickness of 3.36 mm. In addition, the effective absorption bandwidth (EAB, RL ≤ − 10 dB) can be extended to 7.32 GHz, to cover the majority of the C and X bands. Three major aspects contribute to the superior microwave absorption performance: the complementary effect of the polarization of Fe-Ag interface, the impedance matching improvement stems from a proper eddy current, and the small-scale effect caused by a one-dimensional structure. This study demonstrates the promising high-efficiency microwave absorbing capabilities of Fe@Ag core–shell NWs for future use in practical applications.
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Nanotechnology Reviews
·
2021
·Vol. 10
·期 1
·1349-1358
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IF 7.848
Xiaodong Chen,Zhong-Tao Yang,Nannan Wang,Xin Gao,Gang Wang,Chunyu Song,Yunfeng Liu,Lifeng Cui
ZnO nanomaterials with the stereochemical structure were becoming a research focus in the scope of photocatalytic materials, but the ZnO was sensitive to UV light rather than the solar light source, which considerably prohibited its extended application. ZnO nanomaterials coupled with other nanomaterials could generate the alternative composite heterojunction nanomaterials to promote the photocatalytic activity. Herein, we reported two facile and feasible synthesis methods to fabricate TiO 2 /ZnO cube nanocomposites and Ag/ZnO hollow spheres by hydrothermal reaction and chemical deposition, respectively. In this regard, these composited nanomaterials have been successfully fabricated with high purities, good morphology, and crystal structure. Noticeably, in contrast with TiO 2 /ZnO and Ag/ZnO bulk nanocomposites, the Ag/ZnO hollow spheres could offer the higher activity for RhB degradation under the visible light. Moreover, the photocatalytic performance of Ag/ZnO for RhB degradation could be improved synergistically, and the effect of RhB degradation was highest when the Ag mass ratio was modulated at 10% in the sample. Furthermore, it remained a high photocatalytic efficiency even after four cycles. This protocol provided an approvable approach to fabricate efficient photocatalysts with persistent photostability in the wastewater treatment process.
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危险品化学品经营许可证（带存储）