Micro & Nano Letters
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2019
·Vol. 14
·期 8
·865-867
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IF 0.975
Miao Liang,Guo Zhang,Ruili Li,Yajie Feng,Jianmin Wang,Pei Hou
An environmentally friendly and facile method for the synthesis of small-sized Au–Ag alloy nanoparticles is proposed. The method involves the coreduction of HAuCl 4 and AgNO 3 using Lysimachia christinae polysaccharide as reductant and stabiliser at 85°C. The synthesised alloy nanoparticles with a mean diameter of 3.81 nm are stable in solution due to the stabilising effect of the polysaccharide. Furthermore, Au–Ag nanoparticles have first been introduced into cigarette filter to serve as a synergistic catalyst for reducing CO in mainstream smoke.
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COMPOSITES PART B-ENGINEERING
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2019
·
IF 6.864
Jiangtao Xu,Songmin Shang,Shouxiang Jiang
Conventionally, the surface-enhanced Raman spectroscopy (SERS) measurement is performed by dispersing noble metal nanoparticles onto the target sample directly or assembling noble metal nanoparticles onto a micro-sized substrate. Despite it is flourishing, this method is not adequate for various samples, mainly limited by either a defined confinement of the test position or the complex extraction process of the target sample on the irregularly shaped surface, besides the costive materials, complex and uncontrollable fabricating processes. Herein, we demonstrate that the α-Fe 2 O 3 thin film is decorated with Ag nanoparticles constructed on SiO 2 fibers as a flexible SERS-active substrate, which yields a functional optical enhancement of the signal at 532 nm laser excitation . It shows a high enhancement factor of 4.71 × 10 5 , ultrahigh sensitivity of 10 −15 M, and excellent signal stability with a relative standard deviation (RSD) of 1.22% and reproducibility with a RSD of 0.258%.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Yi Lin,Shaohua Xu,Jiao Yang,Youju Huang,Zhitao Chen,Bin Qiu,Zhenyu Lin,Guonan Chen,Longhua Guo
Common colorimetric immunoassays only show monochromatic intensity variations, and the absorbance intensity is utilized for the quantitative detection of the analytes. Herein, we demonstrate for the first time that Au Nanobipyramid@Ag Nanorods (Au NBP@Ag) is an ideal multicolor chromogenic substrate for immunoassays which combines the absorbance intensity with the Localized Surface Plasmon Resonance (LSPR) peak shifts are utilized for quantitative detection of the analytes, and vivid color variations are used for semi-quantitative detection. Our investigation reveals that unlike the single metallic nanoparticles such as gold nanorods which show one-way LSPR peak shifts, Au NBP@Ag Nanorods shows an interesting multi-way peak shifts: the LSPR peak would initially blue shift, and then red shift, finally blue shift again during the etching process. As a result, a series of vivid colors can be observed. The results indicate that the correlation linear range for the detection of Squamous cell carcinoma antigen (SCCA) was 2.5–105 ng/mL. Although only the detection of SCCA is demonstrated in this work, this method is easy to expand to detect other biomarkers since our method is based on conventional immunoassay strategy.
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MICROCHIMICA ACTA
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2019
·Vol. 186
·期 2
·1-9
·
IF 5.479
Yao Li,Li Yulin,Cheng Kewen,Pan Daodong,Xu Jianguo,Chen Wei
The authors describe an aptamer-based assay for 17β-estradiol. It relies on the combined use of surface enhanced Raman scattering (SERS) and hybridization chain reaction (HCR). The aptamer against 17β-estradiol is applied as the recognition probes, and this results in excellent specificity. Specific recognition of target 17β-estradiol induce the freedom of DNA 2, which will open the stem-loop structure of probe 1 on the Au@Ag and form the partial dsDNA structure. With the nicking enzyme, the partial dsDNA will be hydrolyzed and the reside ssDNA on Au@Ag will form a small stem-loop structure. With the help of the other probe 2 modified Au@Ag and pre-immobilized probe 3 on the well of the microplate, an enzyme-free HCR can occur and tremendous Au@Ag can be assembled along the formed dsDNA in HCR, which can act as the excellent substrate for Raman measurement and greatly amplify the Raman signal of R6G on the Au@Ag. Afterwards, the key factor, ratio between probe 2-Au@Ag (P2) and probe1-Au@Ag (P1), affects the detection sensitivity is systematically optimized for the best sensing performance. The SERS signal of R6G, best measured at 1651 cm −1 , increases linearly in the wide range from 1 pM to 10 nM. The detection limit can be as low as 0.1 pM.
Schematic presentation of an aptamer-based surface enhanced Raman scattering method for accurate detection of 17β-estradiol, which is integrated with hybridization chain reaction for signal amplification and sensitivity improvement.
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SOLID STATE SCIENCES
·
2019
·
IF 2.155
Yunfang Huang,Hui Xu,Dan Luo,Yuezhu Zhao,Yu Fang,Yuelin Wei,Leqing Fan,Jihuai Wu
Full-spectrum-responsive Ag/Bi/BiOCl hierarchical micro-flower heterojunction via a facile in-situ solvothermal route. The samples were characterized by XRD , SEM, TEM , XPS , BET and UV–Vis–NIR. The in-situ incorporation of Bi into the semiconductor BiOCl nanosheets with oxygen vacancies could be regulated efficiently by the Ag + additive content. The samples presented a strong optical absorption in the whole region of 200–2400 nm and displayed excellent photocatalytic performance over the full solar spectrum. The presence of metallic Ag, Bi and oxygen vacancies strengthened the light absorption and promoted the charge-carrier separation of BiOCl, resulted in higher photocatalytic activity than that of pure BiOCl and P25 under UV and visible light irradiation. Furthermore, the photocatalytic responsiveness of Ag/Bi/BiOCl was successfully extended to the NIR region. On the basis of the radical species trapping experiments, h + , •O 2 − , and •OH were confirmed to be the mainly active species involved in the degradation of organic pollutants in the NIR region.
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CRYSTENGCOMM
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2018
·Vol. 20
·期 25
·3550-3558
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IF 3.304
Fang Tang,Meizhu Zhang,Zhongbo Li,Zhaofang Du,Bensong Chen,Xuan He,Siyu Zhao
Surface-enhanced Raman scattering (SERS) is one of the most promising methods in detecting trace amounts of molecules owing to its high sensitivity, fast response, and high molecular specificity. One of the key issues for SERS applications is to fabricate highly sensitive and homogeneous SERS substrates. Here, we present a template-assisted synthetic approach to fabricate urchin-like Ag-nanoparticle (Ag-NP) decorated ZnO-nanorods grafted on hexagonally ordered polyacrylonitrile (PAN) nanopillar arrays as flexible and reliable surface-enhanced Raman scattering (SERS) substrates, which are achieved by a combined process of molding highly ordered PAN-nanopillar array films, electrochemical depositing ZnO nanorods onto molded PAN nanopillar arrays, then sputtering Ag-NPs onto the surface of ZnO nanorods. The resultant hetero-hierarchical nanostructure exhibits not only much stronger SERS activity but also uniform SERS signals over the whole arrays based on the high density of nanogaps (hot spots) between the neighboring Ag-NPs on both the same ZnO-nanorods and adjacent ZnO-nanorods and the highly ordered PAN-nanopillar arrays. Using the Ag-NP assembled ZnO-nanorod arrays as SERS-substrates, not only 10−13 M Rhodamine 6G has been identified, but also 10−8 M parathion-methyl has been recognized, showing great potential in detection of trace organic pollutants in the environment. Furthermore, the Ag-NPs@ZnO-nanorods could achieve self-cleaning and reactivation of SERS-activity by simple UV light irradiation and retain stable SERS sensitivity even after five cycles, demonstrating the high reusability of the hybrid substrates.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
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IF 2.88
Zhenxing Qin,Wenhai Wang,Xiaozhi Zhan,Xiujuan Du,Qingmei Zhang,Rui Zhang,Kun Li,Jinhong Li,Weiping Xu
Luminescent carbon-based nanoparticles , named often as carbon dots (CDs), were synthesized from citric acid (CA) and guanidine thiocyanate (GITC) via an N and S co-doped hydrothermal procedure. In the present structure characterization, N and S elements could be sufficiently doped by means of the heteroatom or the functional groups bonded on the surface of CDs. The as-prepared CDs solution showed blue color fluorescence under ultraviolet excitation, yet the PL spectra exhibited a repetitive emission process from excitation-independent to excitation-dependent. In view of the triexponential feature of fluorescence lifetimes of CDs, one possibility was proposed to be co-existence of two types of CDs with different surface states. Additionally, the as-prepared CDs were used as a sensing probe for the detection of Ag + taking into consideration of the possible interactions between Ag + and various fluorophores attached to the CD surface. As expected, the changes of fluorescence intensities were linearly proportional to the different concentration ranges of Ag + , which suggests the complex nature of the quenching mechanism. And for the first time, the S C N group was found to accelerate the quenching of CDs towards Ag + , promising a new approach for efficient detection of Ag + for the application in industrial pollutants.
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Nanoscale Research Letters
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2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Lu Junlin,Shang Chaoqun,Meng Qingguo,Lv Haiqin,Chen Zhihong,Liao Hua,Li Ming,Zhang Yongguang,Jin Mingliang,Yuan Mingzhe,Wang Xin,Zhou Guofu
A series of novel visible light driven all-solid-state Z-scheme BiOBr 0.3 I 0.7 /Ag/AgI photocatalysts were synthesized by facile in situ precipitation and photo-reduction methods. Under visible light irradiation, the BiOBr 0.3 I 0.7 /Ag/AgI samples exhibited enhanced photocatalytic activity compared to BiOBr 0.3 I 0.7 and AgI in the degradation of methyl orange (MO). The optimal ratio of added elemental Ag was 15%, which degraded 89% of MO within 20 min. The enhanced photocatalytic activity of BiOBr 0.3 I 0.7 /Ag/AgI can be ascribed to the efficient separation of photo-generated electron–hole pairs through a Z-scheme charge-carrier migration pathway, in which Ag nanoparticles act as electron mediators. The mechanism study indicated that ·O 2 − and h + are active radicals for photocatalytic degradation and that a small amount of ·OH also participates in the photocatalytic degradation process.
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Fumei Zuo,Cong Zhang,Han Zhang,Xingrong Tan,Shihong Chen,Ruo Yuan
A solid-state electrochemiluminescence (ECL) biosensor for the detection of concanavalin A (Con A) was constructed using graphene quantum dots (GQDs) as luminophore, which were loaded on polyamidoamine (PAMAM) functionalized CeO 2 @Ag NPs by the interaction between the NH 2 of PAMAM and the COOH of GQDs. The electrodepositing gold layers were used as matrix to immobilize glucose oxidase (GOx). GOx served as recognition elements to further capture Con A by the specific interaction between carbohydrate and Con A. With the increase of the concentration of Con A, the amount of GOx-CeO 2 @Ag-GQDs incubated onto the electrode was increased and a higher ECL signal was obtained. The constructed biosensor exhibited a sensitive response towards Con A and a low detection limit of 0.16 pg/mL was obtained. Such a construction strategy provides a new approach for applying GQDs to establish a solid-state ECL biosensor.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 4
·2975-2989
·
IF 2.993
Zhang Yuheng,Gong Mindong,Liu Xi,Ji Lijun,Yang Zhenglong,Zhu Xiashi
Titanium oxide (TiO 2 ) has been widely investigated as a photocatalytic material for degradation of organic pollutant in waste water. However, nanosized granular TiO 2 nanoparticles are hard to be recycled and re-utilized in water and many cause secondary pollution of water. Hence, we constructed a foam-like photocatalyst, which was composed of carbonaceous support: activated carbon nanotube foams and Ag-doped TiO 2 nanoparticles through a method of a template synthesis and carbonization strategy. The as-prepared photocatalyst evidenced to be hierarchical macroporous and mesoporous and exhibited remarkable photocatalytic performance toward the degradation of unsymmetrical dimethylhydrazine under UV and visible light. The structure characterization and photocatalytic performance investigation confirmed that the enhanced photoresponse was attributed to the high efficiency of charge separation and the surface plasmon resonance effect of metallic Ag. The adsorption synergetic effect of the hierarchical porous structure also played an important role in photodegradation. The as-prepared photocatalyst showed great potential in the treatment of waste water containing organic pollutant.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Yanfang Xu,Jinhuan Li,Huanmin Ji,Xuexue Zou,Jiaojiao Zhang,Yi Yan
The dielectric-dielectric composite (SRGA) for electromagnetic absorber was fabricated via integrating Ag(I)-Schiff base coordination compounds (SSBCC) with three-dimensional reduced graphene aerogel (3D-rGA) powders. SRGA showed excellent electromagnetic wave absorption properties in terms of reflection loss, absorption band width and absorber thickness. Specially, when the mass ratio of SSBC to 3D-rGA powders was 1:3 (SRGA-25), the maximum value of reflection loss at 2 mm was up to −63.82 dB and the effective frequency bandwidth of 6.28 GHz (10.16–16.44 GHz) at 2.5 mm can be obtained. The mechanism investigation of electromagnetic wave absorption for SRGA showed that the enhanced electromagnetic wave absorption was ascribed to enhanced polarization loss derived from good 3D-conductive-network units of 3D-rGA, abundant interfaces caused by the media heterostructure due to the introduction of SSBCC and the good impedance matching condition. And 3D-rGA based materials might be put into practical application only in powder state due to the very low strength of the buck state. Therefore, the investigation on SRGA in our contribution is considered to be an actual performance evaluation of the materials based on three-dimensional graphene for microwave attenuation. This work also provided a method for fabricating excellent graphene-based electromagnetic wave absorbers by simply mixing a suitable dielectric lossy material, e.g. SSBCC.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Ruohao Dong,Haoran Du,Yixuan Sun,Kuangfu Huang,Wen Li,Baoyou Geng
The design and synthesis of high-performance catalysts for oxygen evolution reaction (OER) are crucial for electrocatalysis reaction. In this study, the new Ag-decorated Co-based hydroxides nanosheets with good performance as well as gram-scale yield are prepared by a selective reduction–oxidation method in virtue of the different stability of metal in air. The doping of silver obviously raises the electrical conductivity of the catalysts. Due to the synergistic reaction of the high electrical conductivity and the original active sites, the overpotential of the as-prepared Ag-decorated Co(OH)2 nanosheets is as low as 270 mV at 10 mA/cm2. Compared to the pure Co(OH)2 nansheets, the overpotential decreased about 80 mV at the same current density. Especially, different from the general preparation methods, this process can be carried out at room temperature and does not need any strict condition. And the gram-scale output gives this method potential for industrial production.
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