OPTICS EXPRESS
·
2024
·Vol. 32
·期 6
·9995-10004
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IF 3.2
Jiawei Huang,Rui Li,Hengchang Zhang,Ying Wu,Yunxia Wang,Yunxia Wang,Changchun Yan,Changchun Yan,Caiqin Han,Caiqin Han
We present a design of middle-infrared modulation absorbers based on vanadium dioxide (VO2). By using the electron beam evaporation technique, the Ag/SiO2/VO2/Ag/VO2 multilayer structure can achieve double band strong absorption in the mid-infrared, and dynamically adjust the absorption performance through VO2. The simulation results demonstrate a remarkable absorption rate of 91.8% and 98.9% at 9.09 µm and 10.25 µm, respectively. The high absorption is elucidated by analyzing the field strength distribution in each layer. Meanwhile, based on the phase change characteristics of VO2, the absorber has exceptional thermal regulation, with a remarkable 78% heat regulation range in the mid-infrared band. The size altering of the absorbing layer is effective in enhancing and optimizing the structure's absorption performance. The structure is used to characterize probe molecules of CV and R6 G by mid-infrared spectroscopy, which illustrates an impressive limit of detection (LOD) of 10−7 M for both substances. These results provide valuable insights for designing future high-performance tunable optical devices.
研究领域:
光学
·
材料科学
·
光谱学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhiang Hou,Jiangfeng Chu,Cong Liu,Jinnan Wang,Aimin Li,Tong Lin,Corvini Philippe François-Xavier
Photocatalytic denitrification has attracted great attention owing to its high efficiency and environmentally friendly features. However, selectively photocatalytic reduction of high concentration nitrate to N 2 is still a challenging problem due to the competition of photons between nitrate and photocatalysts. Herein, the Ag/SiO 2 core encapsulated in the crystalline TiO 2 shell (Ag/SiO 2 @ c TiO 2 ) was constructed for improvement of photocatalytic denitrification. Finite difference time domain (FDTD) simulation demonstrated that strong light scattering improved light harvesting via optical confinement. Meanwhile, surface plasmon resonance and electron sink effect of Ag not only enhanced the photogenerated electrons density but also promoted charge carriers separation of Ag/SiO 2 @ c TiO 2 . More importantly, e cb − of TiO 2 -shell could be immediately transferred to Ag to keep the balance between Ag 0 and Ag + , which contributed to the good stability of Ag/SiO 2 @ c TiO 2 . 95.8% nitrate ( C 0 = 2000 mg/L) was removed by 5 wt%Ag/SiO 2 @ c TiO 2 with N 2 selectivity of 93.6% within 4 h. Even after five cycles, 5 wt%Ag/SiO 2 @ c TiO 2 still remained high photocatalytic denitrification efficiency (92.2%). Notably, since TiO 2 -shell prevented the reaction between Ag and Cl − , more than 92% nitrate could be removed within 5.3 h in the presence of high concentration Cl − .
研究领域:
环境科学
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材料科学
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化学工程
·
催化
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Xiaolin Zhang,Jianguo Tang,Haidong Li,Yao Wang,Xinzhi Wang,Yanxin Wang,Linjun Huang,Laurence A. Belfiore
This work demonstrated red light emitting nano-PVP fibers that incorporated with novel three-layer nanostructure of Ag@SiO 2 @Eu(tta) 3 phen nanoparticles (Ag@SiO 2 @Eu(tta) 3 phen-NPs), and the hybrid nano-PVP fibers were fabricated via a remarkably simple electrostatic spinning method. For Ag@SiO 2 @Eu(tta) 3 phen-NPs, the thickness of SiO 2 is optimized to obtain the maximum luminescent intensity , as results, the optimized thickness of SiO 2 is 20 nm. And the corresponding luminescent intensity (612 nm) of the Ag@SiO 2 @Eu(tta) 3 phen-NPs is enhanced up to 10 times compared with the pure Eu(tta) 3 phen complex, which indicates that with 20 nm SiO 2 thickness, the localized surface plasmon resonance (LSPR) effect of Ag@SiO 2 exhibits highest performance for enhancing luminescence. Moreover, the luminescent PVP fibers emit bright red light under the fluorescence microscope, which definitely confirms that the microenvironment provided by PVP polymer is absolutely suitable for the fluorescent composites.
研究领域:
材料科学
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纳米技术
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光学
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聚合物科学
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产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Zhilei Zhao,Mengyu Ren,Wenqi Zhang,Zikuo Chen,Lu Zhang,Xinquan Qu,Junling Shi,Weiwei Xia,Xiaoguang Xu,Ying Yang
In view of the serious harm and widespread pollution caused by deoxynivalenol (DON), it is crucial to quantify its presence in the food safety assessment process. Here, we designed a core-shell-satellite nano assembly structure as a probe, composed of an anisotropic AuNR@Ag core, an ultra-thin SiO 2 layer and a high surface coverage AuNPs satellites, which showed outstanding SERS activity and high stability. Anti-DON antibodies were modified on the surface of the prepared core-shell-satellite nano-assembly structure as SERS immunoprobe for DON specific detection using SERS-based lateral flow immunoassay (LFIA) with the advantages of simplicity, rapidity, and high sensitivity. Under optimal conditions, the detection limit for detecting DON using the SERS-LFIA method was 0.053 fg/mL, and the linear detection ranged from 0.1 fg/mL to 1 μg/mL. The SERS-LFIA strips based on AuNR@Ag@SiO 2 -AuNP nanostructures demonstrated the great potential for quick quantitative DON detection, providing a reference for trace detection of highly toxin mycotoxins.
研究领域:
食品科学
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分析化学
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纳米技术
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Ying Yang,Jian Zhu,Jing Zhao,Guo-Jun Weng,Jian-Jun Li,Jun-Wu Zhao
The identification and detection of cancer biomarkers in early stages is an important issue for the therapy of cancer. However, most methods are time-consuming and have limited sensing sensitivity and specificity. In this work, we prepared a novel plasmonic multilayered core–shell–satellite nanostructure (Au@Ag@SiO2–AuNP) consisting of a gold nanosphere with a silver coating core (Au@Ag), an ultrathin continuous silica (SiO2) shell, and a high coverage of gold nanosphere (AuNP) satellites. The Au@Ag core is a prominent surface enhanced Raman scattering (SERS) platform, and the thin SiO2 layer exhibits a long-range plasmon coupling between the Au@Ag core to the AuNP satellites, further leading to enhanced Raman scattering. Meanwhile, the outer AuNP satellites have a high biocompatibility and long-term stability. Combining the above advantages, the well-designed metallic nanoassemblies would be a promising candidate for SERS-based applications in biochemistry. For specific detection of alpha-fetoprotein (AFP), we utilized the SERS-active core–shell–satellite nanostructures modified with AFP antibody as immune probes and nitrocellulose membrane (NC) stabilized captured anti-AFP antibodies as solid substrate. To improve the detection performance, we further systematically optimized the parameters, including the silver coating thickness of the Au@Ag core and the density and size of the satellite AuNPs. Under the optimized conditions, AFP could be detected by the SERS-based sandwich immunoassay with an ultralow detection limit of 0.3 fg/mL, and the method exhibited a wide linear response from 1 fg/mL to 1 ng/mL. The limit of detection (LOD) was considerably lower than conventional methods in the literature. This work relies on the unique Au@Ag@SiO2–AuNP nanostructures as the immune probe develops a new outlook for the application of multilayered nanoassemblies and demonstrates the great potential in early tumor marker detection.
研究领域:
纳米技术
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生物医学工程
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分析化学
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癌症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Lingyun Ye,Haohui Li,Jiawei Xiang,Junqi Chen,Xin Zhang,Shaona Zheng,Wenbo Liao
In this study, Ag@SiO 2 core-shell nanoparticles were synthesized using the Stöber method and then physically mixing with MPS functionalized poly (styrene-co-acrylate) (PSA) emulsion to obtain a novel antibacterial composite material (PSA/Ag@SiO 2 ). The dispersion of composite latexes was improved by the formation of Si-O-Si covalent bonds , and the migration of AgNPs on the surface of composite films enhanced their antimicrobial activity. Analysis of UV-Vis absorption spectra , TEM images, XPS and XRD data confirmed the core-shell structure of Ag@SiO 2 and the successful coating of AgNPs by SiO 2 . TEM micrographs showed that Ag@SiO 2 core-shell nanoparticles were uniformly dispersed in the composite latexes, with an average particle size of 198 nm for PSA/Ag@SiO 2 composite latexes, larger than that of PSA latexes (162 nm). FTIR spectra also indicated the presence of Si-O-Si covalent bonds resulting from the sol-gel reaction between MPS functionalized PSA with Ag@SiO 2 . XPS and WCA characterization revealed the disruption of the core-shell structure of Ag@SiO 2, leading to the migration of AgNPs to the air-film interface. The results of antibacterial activity demonstrated that PSA/Ag@SiO 2 composite films displayed antibacterial activity against both E. coli and S. aureus , and the former displayer a slightly better antibacterial activity than the latter. The water-based acrylic polymer coatings with antibacterial properties explored in current work have various applications in wood paints, varnishes, metal protection, decorative systems and other related fields.
研究领域:
材料科学
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纳米技术
·
高分子科学
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化学工程
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2018
·
IF 2.207
Qing Fu,Xiaolin Zhang,Peipei Yan,Shichao Wang,Xinzhi Wang,Yao Wang,Linjun Huang,Yanxin Wang,Haiyan Liu,Laurence A. Belfiore,Jianguo Tang
This paper presents strong fluorescence of spin-coated fluorescent solid organic dye films (SODF) enhanced by surface plasmonic resonance (SPR). In order to manifest the influence of SPR effect on enhancement of organic dye (OD) fluorescence, the organic dye embedded Ag@SiO2 fluorescent films were developed on the glass sheet substrate, in which Ag@SiO2 nanoparticles were embedded in the middle and organic dye was as upper layer. The morphology of the SODFs with and without Ag@SiO2 particles was studied by SEM and EDX, and the tests revealed that the Ag@SiO2 nanoparticles distributed evenly between glass sheet and OD layer. Optical properties were characterized by UV absorption and fluorescence spectroscopy; the lifetime of SODF was tested to discuss the mechanism of SPR enhancement of fluorescence. The results proved that the existence of Ag@SiO2 particles enhanced the fluorescence intensity for 7 times and thus proved the SPR effect for organic dye, especially when the organic dye is the solid films. Therefore, the most important is the creation that the SPR effect of Ag@SiO2 particles works very well under solid organic dye coverage.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Hu Li,Jun Guo,Chao Gao,Mingxi Pan,Congqing Yang,Yingying Peng,Hui Huang
The rapid advancement of social information substantially expands the application range of electromagnetic technology and leads to a significant increase in electromagnetic wave pollution. In this study, silver ions undergo sensitization, activation, and subsequent reduction processes, the silver shell is formed on SiO 2 matrix. Microstructure, morphology, and electromagnetic wave absorption performance of as-prepared Ag@SiO 2 and SiO 2 were explored. When the Ag content reaches 10 wt%, the shells achieve a dense coating on the matrix. The results demonstrate that the Ag@SiO 2 (10 wt%) composite achieves a remarkable reflection loss of −52.48 dB and an absorption bandwidth of 2 GHz, at an absorber thickness of 5.3 mm and a frequency of 4.96 GHz. Compared to the reflection loss of −2.5 dB exhibited by SiO 2 , it showcases excellent electromagnetic wave absorption capability. Such significantly enhanced absorption capability of Ag@SiO 2 composites can be attributed to local surface plasmon resonance behavior induced at the interface. This study elucidates the electromagnetic wave absorption mechanism of the Ag@SiO 2 composite and successfully demonstrates its potential as a high-performance composite for electromagnetic wave absorption. Consequently, it provides a feasible solution to address the challenges associated with electromagnetic pollution.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
OPTICS COMMUNICATIONS
·
2026
·
IF 2.7
Haiyu Tian,Haidong Qi,Yongjun Zhang,Yaxin Wang,Xiaoyu Zhao,Renxian Gao
Surface-enhanced Raman scattering (SERS) is a powerful surface analysis technique that significantly amplifies the Raman scattering signals of molecules adsorbed onto metallic nanostructures, enabling highly sensitive detection of the analytes. The development of low-cost, high-performance SERS substrates through facile and straightforward fabrication methods represents a challenging and highly rewarding endeavor. Here, we develop a suspended sandwich Ag/SiO 2 /Ag nanopore array structure based on template-assisted method with significant plasma coupling effects, which shows an ultra-low detection limit (LOD of 2.91 × 10 −11 mol/L) for 4-MBA molecules, excellent sensitivity (EF = 5.76 × 10 8 ) and high uniformity and stability. COMSOL simulation confirms the electromagnetic coupling in the sandwich structure in addition to the hotspots along the nanopore brims. The proposed SERS substrate enables quantitative detection of glyphosate with the concentration down to 4.66 × 10 −9 mol/L and fulfills the requirements for monitoring pesticide residues.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 42
·32985-32994
·
IF 4.4
Tian Haiyu,Zhang Yongjun,Wang Yaxin,Zhao Xiaoyu,Gao Renxian
We develop a suspended Ag-SiO 2 composite nanopore array by a self-assembly strategy, which exhibits significant SERS effects with plenty of 3D hot spots. The Ag-SiO 2 composite nanopore array is composed of Ag nanoparticles isolated by SiO 2 , which shows strong electromagnetic coupling between discrete silver nanoparticles and along each nanopore structure, as confirmed by COMSOL simulations. SERS observations for the prepared Ag-SiO 2 composite nanopore array show an ultra-low detection limit, excellent sensitivity, high uniformity, and stability, which is successfully applied for pyridaben detection of with the detection limit 1.19 × 10 –10 M.
✓ 已验证
DOI
高影响因子
JOURNAL OF WATER AND HEALTH
·
2017
·Vol. 15
·期 3
·341-352
·
IF 1.041
Wu Huiqing,Huang Jing,Liu Yuejun
An anti-fouling hybrid membrane was prepared by incorporating Ag-SiO 2 nanohybrid into a polysulfone (PSf) matrix. The addition of Ag-SiO 2 can significantly improve the hydrophilicity, separation property, anti-fouling ability, and especially anti-bacterial activity of hybrid membranes. The optimum performance of the Ag-SiO 2 /PSf hybrid membrane is achieved when the concentration of Ag-SiO 2 is as low as 0.45 wt%. Compared with PSf membrane and SiO 2 /PSf hybrid membrane, the Ag-SiO 2 /PSf hybrid membrane displays the best overall properties. The excellent performance of the Ag-SiO 2 /PSf hybrid membrane can be attributed to the well-tailored structure and unique property of Ag-SiO 2 nanohybrid, where nanosized Ag (∼5 nm) can densely and uniformly disperse on the surface of silica spheres. The obtained membrane could be a promising material for water treatment.
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 75
·期 1
·82-89
·
IF 1.532
Xiao Zuo-Yi,Huang Shu-Xian,Zhai Shang-Ru,Zhai Bin,Zhang Feng,An Qing-Da
Abstract A one-pot method was introduced to fabricate Ag–SiO 2 hollow composite spheres with developed porosity by employing monodisperse carboxylic-capped polystyrene (PS–COOH) spheres as a hard template. During the synthetic process, Ag + ions were immediately anchored on the surface of the PS–COOH spheres via electrostatic interaction and readily reduced by employing polymethylhydrosiloxane (PMHS) as a reducing agent. At the same time, silica oligomers derived from the hydrolysis of PMHS and TEOS were slowly deposited on the PS–COOH spheres to form solid silica shells. Subsequent decomposition of the PS–COOH spheres in air induced the formation of Ag–SiO 2 hollow spheres. The as-prepared products were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and N 2 absorption–desorption study. The results show that the well-designed composite spheres featured thin and spherical silica shell (~10 nm), large surface area (>240 m 2 g −1 ) and mesopore (6.0–9.0 nm). In addition, the Ag–SiO 2 hollow composite spheres exhibited high catalytic performance toward the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). Graphical Abstract A one-pot method was reported to prepare Ag–SiO 2 hollow spheres with well-developed porosity, which exhibited high catalytic performance and durable activity for the reaction of 4-NP to 4-AP.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）