JOURNAL OF APPLIED PHYSICS
·
2019
·Vol. 125
·期 18
·
IF 2.328
Zhang Kaixuan,Xu Na,Jia Mengyu,Li Ruoping,Huang Mingju
Noble-metal-based surface-enhanced Raman spectroscopy (SERS) substrates can be employed as catalysts capable of generating hot electrons to drive chemical reactions of target molecules adsorbed on their surface. However, the localized surface plasmons excited from pure noble metals generally exhibit relatively low hot-electron utilization efficiency with the reactants owing to charge carrier recombination. This problem can be solved by integrating heterogeneous structures with the noble metal. Herein, we describe the fabrication of bifunctional SERS substrates by constructing Au@Ag, Au@Ag 2 S, and Au@SiO 2 core-shell nanoparticles and evaluate the effects of the three heterostructures (Au cores encapsulated by shells composed of metal, semiconductor, or insulator) on the hot-electron transfer efficiency by in situ monitoring of the catalytic dimerization of p -nitrophenol to form p , p ′-dimercaptoazobenzene under 632.8 nm laser illumination. The developed SERS strategy opens up new opportunities for exploring hot-electron-induced reactions as well as providing a useful reference for photocatalyst selection.
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 7
·076430
·
IF 1.449
Ying Tao,Daocheng Pan
Transparent conductive thin films play an important role in antistatic coating. In this work, highly robust Ag nanowires/TiOx hybrid transparent conductive thin film was deposited by a one-step and low-temperature method. Firstly, 4.2 g of silver nanowires and 1.0 liter of TiOx sol-gel solution were synthesized. The Ag nanowire dispersion and TiOx sol-gel solution were mixed and sprayed onto many types of substrates, including glass, wood and marble. Highly robust Ag nanowires/TiOx hybrid thin film with a sheet resistance of 7–102*/□ and transmission of 63%–84% can be obtained by a low-temperature sintering process or by UV/ozone irradiation at room temperature. Our results indicated that low-cost and robust Ag nanowires/TiOx hybrid thin films have a high potential in antistatic coating.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Jie Chang,Amin Zhang,Zhicheng Huang,Yunsheng Chen,Qian Zhang,Daxiang Cui
The rapid identification of living cancer cells is highly crucial for cancer diagnosis, prognosis, and treatment monitoring. However, it is a great challenge to develop an effective way for rapid identification and imaging of cancer cells in a living state. Moreover, synthesis of monodisperse nanoparticles (NPs) with high sensitive surface-enhanced Raman scattering (SERS) activity is also a tough work. Herein, we creatively reported a convenient method to synthesize the novel NPs as the substrate of SERS sensors, which possessed a gold nanobipyramid core and silver nanorod shell. These gold nanobipyramid core and silver nanorod shell NPs (Au NBP@Ag NRs) were further modified with 4-mercaptobenzoicacid (4-MBA, Raman reporter molecule) and then conjugated with reduced bovine serum albumin (rBSA) and folic acid (FA) on their surfaces, to finally acquire Au NBP@Ag NR-MBA-rBSA-FA nanoprobes. In this system, With the enhancement factor (EF) of Au NBP@Ag NRs was about 4 × 10 7 , it could significantly enhance Raman signal for Raman reporter molecules, and 4-MBA molecules performed high SERS signals based on their structures; the nanoprobes have favorable specificity and biocompatibility owing to the modification of rBSA which effectively avoided the nonspecific attachment of non-targeted cells. Moreover, the obtained SERS nanoprobes have excellent sensitivity for gastric cancer cells (MGC-803 cells) due to the conjugation of folic acid. Thus, the finally obtained Au NBP@Ag NR-MBA-rBSA-FA nanoprobes possess excellent detection efficiency for living MGC-803 cells. Therefore, our synthesized nanoprobes exhibit ultrasensitive SERS-activity, excellent specificity and superior cancer cells targeting ability, which could be applied for rapid identification and Raman imaging of living cancer cells via the SERS signal detection of the nanoprobes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 7
·1800-1812
·
IF 2.372
Yang Yalin,Liu Yanhong,Mao Baodong,Luo Bifu,Zhang Kewei,Wei Wei,Kang Zhenhui,Shi Weidong,Yuan Shouqi
I–III–VI quantum dots (QDs) play an important role in visible-light-driven photocatalysis due to their unique optical properties and widely tunable bandgap. However, these materials suffer from rich defect states and high charge carrier recombination. In this work, a facile mixed-ligand method was developed for the manipulation of the optical and photocatalytic properties of multinary Ag–In–Zn–S QDs by introducing 3-mecaptopropionic acid (MPA) into the l -cysteine (Cys) capped QDs system during synthesis. The effect and mechanism of MPA addition was systematically investigated. With the increase of MPA/Cys, the photoluminescence (PL) quantum yield (QY) of the QDs shows an obvious increase at the first stage (MPA/Cys < 5:5), whereas the particle size and UV–Vis absorption remain almost unchanged. Photocatalytic properties of QDs shows similar trend as PL QY with the increase of MPA/Cys, where the hydrogen production rate was doubled with MPA/Cys = 5:5. With ascorbic acid (AA) as the sacrificial reagent, the MPA/Cys capped QDs gave a hydrogen production rate as high as 6.64 mmol g −1 h −1 , which is comparable to the state-of-the-art results but without any cocatalyst, indicating the fascination of the simple mixed-ligand method. Further mechanism study indicates that the introduced MPA resulted in dramatic increase of the PL lifetime and the reduction of nonradiative decay, which can be ascribed to the strong passivation effect of MPA. The MPA/Cys capped QDs also show compressed charge recombination as indicated in electrochemical impedance spectra, slightly more negative ζ-potential and reduced hydrated particle radius, which may also contribute to the improved charge transfer for photocatalysis. Our method provides a super simple strategy for the defect manipulation of the Ag–In–Zn–S QDs without the sacrifice of charge transfer, which could be a useful guideline for efficient QDs-based visible-active photocatalysts. Graphical Abstract Mixed-ligand-modified Ag–In–Zn–S quantum dots with improved hydrogen production were prepared.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2019
·
IF 4.865
Hongji Li,Mingchao Wang,Xiaoxue Shen,Sui Liu,Yan Wang,Yue Li,Qingwei Wang,Guangbo Che
The abuse of antibiotics resulted in the pollution of river is more and more serious and it was necessary to exploit a sensitive detection method to improve the traditional analysis measurement. In this test, it is reported an Ag-based SERS sensing membrane synthesized by the technique of SERS detection and membrane separation . SERS analysis technique presented sensitive detection property, which could be applied into trace analysis . Membrane separation could effectively enrich the analytes to improve the sensitivity. The SERS membrane was synthesized by filtrating Ag nanoparticles (NPs) on the surface and investigating the amount of PVP and Ag NPs to the sensitivity. Meanwhile, the addition of Ag NPs effectively improved the hydrophilia to promote the detection effectivity in the water. By the investigations of optical analysis, the SERS membrane presented high sensitivity in the detection of antibiotics. Under the optimal condition, the SERS intensity presented good linear relationship with the concentration of antibiotics between 1.0 nmol L −1 and 200 nmol L −1 . This method provided a sensitive detection approach and broadened the investigation field of antibiotics detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2018
·
IF 2.943
Shuai Mao,Rui Bao,Dong Fang,Jianhong Yi
Ag/AgX (X = Cl, Br) plasmonic photocatalysts were synthesized via a facile one-pot ultrasonic spray pyrolysis method, wherein no additional issues such as high pressure, surfactants and reducing agents were required. The structure, morphology, and optical property of the as-prepared photocatalysts was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), ultraviolet–visible light absorption spectra and total organic carbon (TOC). The results showed that Ag/AgX photocatalysts have excellent photocatalytic performance for the photodegradation of methyl orange (MO) and methylene blue (MB) pollutants under visible light illumination, and the photocatalytic activity maintains a high level after seven cycles. Metallic Ag 0 particles nucleate on the surface of AgX uniformly through the thermal decomposition of residual AgNO 3 solution, which enhanced the interaction between Ag 0 and AgX. The outstanding photocatalytic activity benefits from the small size and high dispersion of Ag 0 nanoparticles and the enhanced interaction between Ag 0 and AgX.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Jianwei Fu,Shaomin Wang,Jianhua Zhu,Kai Wang,Meng Gao,Xuzhe Wang,Qun Xu
Highly dispersed Au-Ag bimetallic nanoparticles were facilely synthesized on the multi-amino poly(cyclotriphosphazene-co-polyethyleneimine) (PCP) microspheres through in situ co-reduction method and then used as catalysts for the reduction of 4-nitrophenol (4-NP). Characterization results showed that the as-synthesized PCP microspheres possessed regular spherical morphology and relatively smooth surface, which could be well modified by highly dispersed Au-Ag bimetallic nanoparticles with size of 2–4 nm. For the reduction of 4-NP, it was found that the as-synthesized PCP@Au-Ag composites showed much better catalytic activity than PCP microspheres supported monometallic counterparts, which could be ascribed to a synergistic effect between Au and Ag in Au-Ag bimetals . For the PCP@Au-Ag catalysts, the rate constant k and intrinsic activity parameter κ of the reaction could be up to 2.87 × 10 −3 s −1 and 144 s −1 g −1 , respectively, and the conversion of the 4-NP could still reach 83% after six cycles. In addition, the possible catalytic mechanism of PCP@Au-Ag composites towards the reduction of 4-AP was also proposed.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 22
·18001-18009
·
IF 3.201
Jingfeng Wang,Yang Li,Yadong Qiao,Guangzhi Yu,Jinzhu Wu,Xiaohong Wu,Wei Qin,Liang Xu
In this study, metal–organic frameworks (MOFs) are used as a host for Ag species and the template of ZnO to fabricate Ag-embedded porous ZnO nanocomposites (Ag–ZnO NCs) with rich and stable interfaces, which is proven to be a perfect platform for constructing hybrid materials. Remarkably, Ag–ZnO NCs exhibit high catalytic activity for the thermocatalytic decomposition of ammonium perchlorate (AP) under the assistance of ultraviolet and visible light irradiation. The highly enhanced catalytic activity of Ag–ZnO NCs originates from the synergistic effects of thermal-driven thermocatalysis and solar light-driven photocatalysis. Especially, under the irradiation of visible light, the plasmon-induced resonance energy transfer (PRET) between the plasmonic metal Ag and the neighboring semiconductor ZnO enhances the charge carrier generation efficiency and suppresses the bulk recombination in the semiconductor, which are responsible for its outstanding catalytic performance.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 31
·17783-17790
·
IF 3.049
Ling Chen,Rui Li,Ping Yang
We report a sensitive and selective localized surface plasmon resonance (LSPR) nanoprobe for the detection of mercuric ions (Hg2+) using gold/silver core–shell nanorods as an optical nanosubstrate. Sulfide can quickly react with silver atoms to generate Ag2S at room temperature in the presence of oxygen. The transformation from Ag shell to Ag2S on the nanorod surface results in its LSPR absorption band shifting to a longer wavelength, which is attributed to their different refractive indices. Interestingly, the morphology also changed from a rod-like to dumbbell shape. However, in the presence of Hg2+, this morphology transformation is inhibited because the sulfide reacts with free Hg2+ prior to the Ag atoms. The amount of Ag2S reduced with the increasing concentration of Hg2+, and the absorption band shift was also decreased. According to this “rod-like to dumbbell or not” shape change, a sensitive and selective LSPR nanoprobe was established, assisted by UV-Vis absorption spectroscopy. The detection limit of this probe for Hg2+ was as low as 13 nM. The efficiency of this probe in complex samples was evaluated by the detection of Hg2+ in spiked water samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 7
·1-14
·
IF 2.009
Chen Xiao-Hong,Zhu Jian,Li Jian-Jun,Zhao Jun-Wu
In this paper, we report plasmonic spectra and surface-enhanced Raman scattering (SERS) dual-mode iodide ions (I − ) detecting probe based on Ag-coated tetrapod Au nanostars (Au@Ag tetrapod nanostars). This probe depends on the fact that I − can etch the silver layer of Au@Ag tetrapod nanostars in the presence of Cu 2+ , which leads to the red shift of in-plane localized surface plasmon resonance (LSPR) peak and decrease of SERS intensity. Indeed, our regular morphologies of Au@Ag tetrapod nanostars provide a uniform response space for the plasmonic spectral probe. The red shift caused by both the silver layer etching and gold tips exposing make the in-plane LSPR peak more sensitive to the changes of I − concentration, which results in an extremely wide linear range of 0.5–280 μM. Meanwhile, when the four Au tips are not fully coated by silver layer but still exposed to outsides, the strong SERS enhancement effect from Ag coating and tip effect together leads to the lower limit of detection (LOD) of 26 nM. Furthermore, this proposed method exhibits a good selectivity for I − over other ions and is well applied in dried kelp and drinking water.
The proposed plasmonic spectrum and SERS dual-mode probe based on the Ag-coated tetrapod gold nanostars exhibits extremely wide linear range and relatively low LOD
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3443-3454
·
IF 2.599
Liu Jiao,Jiang Peng-peng,He Chun,Jiang Xiao-hong,Lu Lu-de
Here, novel and stable core–shell silver–carbon nanocomposites (Ag@CSs) were obtained using glucose as the carbon source and stabilizer, silver nitrate as the silver source, and trioctylamine (TOA) as the soft template and extractant. It is worth mentioning that the shape of the silver core shows the hexagon shape, and we consider that TOA and glucose selectively adsorb the Ag (111) crystal face resulting in this growth pattern of the silver core. Owing to the enhanced local field effect around their sharp corners and edges, such structure exhibits superior properties for the surface-enhanced Raman scattering (SERS) enhancement. The hydrothermal carbon shell not only effectively avoids the agglomeration of Ag nanoparticles core, but also serves as a protective layer of the SERS active nanostructure during the whole course of the experiment. In addition, the thickness of the loose shell was significantly reduced after the product was stored in ethanol solution for a period of time. It is found that dropped cast probe molecules onto Ag@CSs have a lower SERS activity, while that immersed in the probe molecular solution for a period of time have a higher SERS activity, indicating that the detection of the probe molecules using this Ag@CSs substrate may require an interactive process. The results show that the as-obtained Ag@CSs hold tremendous potential for SERS applications for its long-term stability and superior SERS performance.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 47
·期 3
·1847-1858
·
IF 1.579
Jing W. X.,Shi J. F.,Xu Z. P.,Jiang Z. D.,Wei Z. Y.,Zhou F.,Wu Q.,Cui Q. B.
Batches of un-doped and Ag-doped ZnO nanowires (ZnONWs) were prepared hydrothermally on stainless steel wire sieves at varied Zn 2+ concentrations of the growth solution and at different Ag + concentrations of the silver nitrate solution. Methylene blue solution was degraded with these as-prepared ZnONWs in the presences of ultraviolet irradiation. It is found that both the processing parameters greatly affect the surface textures, wettability, and photo-activity of the ZnONWs. The latter synthesizing parameter is optimized only after the former one has been finely regulated. The un-doped and Ag-doped ZnONWs at Zn 2+ concentration of 75 mM of the growth solution and at Ag + concentration of3 mM of the silver nitrate solution both produce Gaussian rough surfaces and in each batch are most hydrophilic. Therefore, in the related batch the contacting surface area of the catalyst is the largest, the hydroxyl radicals attached on the top ends of corresponding ZnONWs the most, and the catalytic activity of these catalysts the optimal. Besides these, the latter synthesizing parameter affects the photo-activity of Ag-doped ZnONWs more significantly than the former one does that of un-doped ZnONWs.
✓ 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）