SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Xiaomeng Dou,Weiming Hao,Xiangqing Li,Lixia Qin,Shi-Zhao Kang
In the present work, Ti mesh loaded with Ag “nanobosk” was prepared through electro-deposition and characterized with X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. Then, the surface enhanced Raman scattering of norfloxacin on the Ti mesh loaded with Ag “nanobosk” was directly explored in norfloxacin aqueous solution. In addition, for practical purposes, the surface enhanced Raman scattering of norfloxacin was studied as a function of content of Ag, pH of solution, ions in water, and salinity, respectively. At last, the surface enhanced mechanisms were discussed preliminarily. The results indicate that the Ti mesh loaded with Ag “nanobosk” is an ultrasensitive surface enhanced Raman scattering substrate for trace norfloxacin in water. When the concentration of norfloxacin is 1 × 10 −5 mol L −1 , the enhancement factor is approximately 5.1 × 10 3 at 1389 cm −1 . And the detection limit is up to 1 × 10 -10 mol L −1 for norfloxacin under optimal conditions. Our work provides a new strategy for designing a sensing platform which is sensitive to trace norfloxacin in water and can be applied in the routine detection.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Yuting Zhang,Dongmei Deng,Xiaoli Zhu,Shuai Liu,Yan Zhu,Long Han,Liqiang Luo
Bimetallic Au-Ag/Co 3 O 4 nanofibers (Au-Ag/Co 3 O 4 NFs) were synthesized by an electrospinning method and calcination treatment. Due to the admirable synergic effect of electrocatalytic ability of Au and Ag, and the large surface-to-volume ratio of Co 3 O 4 nanofibers caused by their rough surface, the synthesized Au-Ag/Co 3 O 4 NFs were applied to a sensing platform for hydrogen peroxide oxidation . Using electrochemical techniques, the novel sensing platform based on Au-Ag/Co 3 O 4 NFs shows a wide linear concentration range with high detection sensitivity of 1241.1 μA mM −1 cm −2 . This sensitive sensor was also applied to determine H 2 O 2 from human breast cancer cells, indicating its great potential application in physiology and pathology.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 23
·7061-7072
·
IF 6.641
Xiangying Meng,Songfang Zhao,Zhe Zhang,Ruliang Zhang,Jinhui Li,Jinfeng Leng,Duxia Cao,Guoping Zhang,Rong Sun
Recently, it has become highly desirable but remains a challenge to design strain-sensing materials with rational geometric structures that endow the strain sensors with high sensitivity, large stretchability and a broad sensing range simultaneously. Herein, core–shell Cu–Ag nanowires (NWs) with tunable morphology and oxidation-resistance are achieved by an effective galvanic replacement reaction between Cu NWs and Ag(NH3)2+ without any additional heating, stirring or reducing agent. When the mass ratio of Cu NWs to AgNO3 is 8 : 6, Cu–Ag NWs exhibit the best oxidation-resistance and electrical conductivity retention in harsh environments. Nacre-mimetic conductive composites are achieved by embedding porous conductive networks composed of Cu–Ag NWs/reduced graphene oxide (rGO) in a poly(styrene-block-butadiene-block-styrene) (SBS) matrix, enabling the process to be simple, energy-saving, and scalable. They can detect both tiny and large deformations with a wide sensing range (up to 374% strain), high sensitivity (a gauge factor up to 87 362), high break elongation (up to 660% strain), and excellent reliability and stability. This successful combination of huge sensing range and high sensitivity is attributed to the high stretchability of the SBS “mortar”, the hierarchical architecture and the synergistic effects of sensitive two-dimensional (2D) rGO, and the conductive stretchable one-dimensional (1D) Cu–Ag NW “brick”. In addition, the composites can be used as patterned conductive interconnects for light-emitting diodes.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Mengyao Ouyang,Jian Wang,Bo Peng,Yujun Zhao,Shengping Wang,Xinbin Ma
A highly efficient Ag catalyst supported on a novel Ti-decorated spherical fibrous silica (Ag/Ti-KCC-1) was synthesized via a facile approach. Characterization of catalysts, including FT-IR, N 2 physisorption, TEM, ICP-OES and DRUV–vis was carried out to investigate the physicochemical properties of the catalyst, XPS, H 2 -TPR, H 2 -TPD and DMO-TGA were conducted to further elucidate the effect of Ti dopant. It is shown that the Ti additive is able to, (1) inhibit the aggregation of Ag; (2) induce electron transfer from Ti to Ag, which effect the Ag dispersion and the adsorption ability of the reactants on the catalyst surface. Proper amount of Ti additive provided a balanced coverage of both hydrogen and dimethyl oxalate (DMO) on catalyst surface, which is essential in promoting the performance of the catalyst in the hydrogenation of DMO. By using the novel 10Ag/0.02Ti-KCC-1 catalyst, a high MG yield of 93.0% under extremely high WHSV of 1.75 h −1 is achieved.
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Nanomaterials
·
2018
·Vol. 8
·期 11
·872
·
IF 3.504
Furu Zhong,Zhaofeng Wu,Jixi Guo,Dianzeng Jia
Picric acid (PA) is an organic substance widely used in industry and military, which poses a great threat to the environment and security due to its unstable, toxic, and explosive properties. Trace detection of PA is also a challenging task because of its highly acidic and anionic character. In this work, silver nanoparticles (AgNPs)-decorated porous silicon photonic crystals (PS PCs) were controllably prepared as surface-enhanced Raman scattering (SERS) substrates using the immersion plating solution. PA and Rhodamine 6G dye (R6G) were used as the analyte to explore the detection performance. As compared with single layer porous silicon, the enhancement factor of PS PCs substrates is increased to 3.58 times at the concentration of 10−6mol/L (R6G). This additional enhancement was greatly beneficial to the trace-amount-detection of target molecules. Under the optimized assay condition, the platform shows a distinguished sensitivity with the limit of detection of PA as low as 10−8mol/L, the linear range from 10−4to 10−7mol/L, and a decent reproducibility with a relative standard deviation (RSD) of ca. 8%. These results show that the AgNPs-modified PS PCs substrates could also find further applications in biomedical and environmental sensing.Keywords:porous silicon photonic crystals;Ag nanoparticles;optical properties;SERS.
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SOLAR ENERGY
·
2018
·
IF 4.374
Huajun Chen,Wenjie Tian,Wuxiu Ding
Metallic sliver-doped mesoporous Al 2 O 3 fibers (meso-Ag/Al 2 O 3 ) that can harvest visible light to speed up solar water purification, were synthesized by one-pot hydrothermal method. Insightful analyses of XRD, XRF and XPS of meso-Ag/ Al 2 O 3 verified that metallic silver occupied interstitial positions of Al 2 O 3 lattice forming interstitial solid solution. N 2 adsorption/desorption illustrated that meso-Ag/Al 2 O 3 exhibited significantly increases in the specific surface area, pore volume and average pore diameter after doping with silver. The UV–Vis diffuse reflectance spectra and disinfection performance indicated that meso-Ag/Al 2 O 3 can harvest visible light to promote the conversion of dioxygen to ROS for water disinfection compared with the widely used TiO 2 . With our approach, we achieved water disinfection of >99.999% inactivation of bacteria in 120 min with a small amount of material (8 mg/L) under simulated visible light.
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Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 18
·2813-2820
·
IF 4.776
Ya Peng,Yu Liu,Xiaolin Lu,Shouju Wang,Maomao Chen,Wenchao Huang,Zhiyou Wu,Guangming Lu,Liming Nie
Core–shell metal nanostructures with versatile functions have attracted extensive attention and are highly desirable for imaging and therapeutic purposes. Among them, gold and silver nanomaterials are widely explored for biological applications due to their unique properties. Despite a wide range of applications, limited enhancement ability and insufficient photothermal performance have hampered their further development. In this work, a novel multifunctional nanoprobe, a Au@Ag nanoplate (NP), is fabricated with a biocompatible surface in the aqueous phase. The as-obtained nanocomposite possesses a unique core–shell triangular configuration, sharp apexes, and a large specific surface area, exhibiting strong absorption at 780 nm. PEG–Au@Ag NPs depict highly sensitive photoacoustic imaging (PAI) capacity and extraordinary photothermal conversion efficiency (η = 73%) under 808 nm laser irradiation. Raman signals are multiplied benefitting from the enhanced surface plasma resonance contributed by the silver layer and sharp spears. PAI provides deeper pathological information while Raman detection presents superficial optical properties. Their union forms comprehensive scale coverage for disease imaging and localization. Outstanding photothermal therapy and antibacterial efficacy are observed on animal disease models. This novel multifunctional nanocomposite not only holds great potential as an excellent contrast agent for the combination of PAI and Raman evaluation, but also allows tumor and infection therapy as well as the corresponding therapeutic monitoring.
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Journal of Materials Chemistry C
·
2012
·Vol. 1
·期 4
·751-756
·
IF 0
Yanyan Chen,Lijian Huang,Shenjie Li,Daocheng Pan
Water-soluble Cu+- and Ag+-doped ZnxCd1−xS quantum dots have been successfully synthesized via a facile and green method. All synthetic procedures were conducted in the open air at 95 °C. Hydrophilic glutathione was used as the capping agent. The influence of the dopant concentration in alloyed ZnxCd1−xS QDs has been investigated. The as-prepared Cu+- and Ag+-doped ZnxCd1−xS/ZnS core–shell quantum dots exhibit tunable emission covering the whole visible light region and the photoluminescence quantum yield (PL QY) can reach as high as 20% and 31%, respectively.
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Nanoscale
·
2015
·Vol. 7
·期 43
·18218-18224
·
IF 7.394
Jing Liu,Guowen Meng,Zhongbo Li,Zhulin Huang,Xiangdong Li
Surface-enhanced Raman scattering (SERS) is considered to be an excellent candidate for analytical detection schemes, because of its molecular specificity, rapid response and high sensitivity. Here, SERS-substrates of Ag-nanoparticle (Ag-NP) decorated Ge-nanotapers grafted on hexagonally ordered Si-micropillar (denoted as Ag-NP@Ge-nanotaper/Si-micropillar) arrays are fabricated via a combinatorial process of two-step etching to achieve hexagonal Si-micropillar arrays, chemical vapor deposition of flocky Ge-nanotapers on each Si-micropillar and decoration of Ag-NPs onto the Ge-nanotapers through galvanic displacement. With high density three-dimensional (3D) “hot spots” created from the large quantities of the neighboring Ag-NPs and large-scale uniform morphology, the hierarchical Ag-NP@Ge-nanotaper/Si-micropillar arrays exhibit strong and reproducible SERS activity. Using our hierarchical 3D SERS-substrates, both methyl parathion (a commonly used pesticide) and PCB-2 (one congener of highly toxic polychlorinated biphenyls) with concentrations down to 10−7 M and 10−5 M have been detected respectively, showing great potential in SERS-based rapid trace-level detection of toxic organic pollutants in the environment.
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TALANTA
·
2014
·
IF 3.511
Yulan Wang,Yong Zhang,Yu Su,Feng Li,Hongmin Ma,He Li,Bin Du,Qin Wei
Determination of squamous cell carcinoma antigen (SCCA) in human serum plays an important role in diagnosis of cervical squamous cell carcinoma. In this work, Au/Ag/Au core/double shell nanoparticles (Au/Ag/Au NPs) were prepared by a simple approach and were used as novel enzyme-mimetic labels for development of a sandwich-type electrochemical immunosensor for SCCA. The nanostructure of Au/Ag/Au NPs could be well confirmed by transmission electron microscope (TEM) and UV–vis spectra. Au NPs decorated mercapto-functionalized graphene sheets (Au@SH-GS) were used as platform for immobilization of primary antibody (Ab 1 ), while Au/Ag/Au NPs were employed as labels of secondary antibody (Ab 2 ). Due to the excellent electrocatalytic activity of Au/Ag/Au NPs towards the reduction of hydrogen peroxide (H 2 O 2 ), electrochemical amperometric responses to SCCA were achieved after the immuno-reaction. Under optimum conditions, the electrochemical immunosensor exhibited a wide linear range from 0.5 pg/mL to 40 ng/mL with a low detection limit of 0.18 pg/mL for SCCA. The designed immunosensor displayed an excellent analytical performance with good reproducibility, high selectivity and stability.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Pengjuan Ni,Yujing Sun,Haichao Dai,Shu Jiang,Wangdong Lu,Yilin Wang,Zhen Li,Zhuang Li
A novel colorimetric method for the detection of acetylcholinesterase (AChE) and its inhibitor by taking utilization of Ag [I] ion–3,3′,5,5′-tetramethylbenzidine (TMB) detection system has been proposed. Ag [I] ion could oxidize TMB to induce a blue color and an absorption peak centered at 652 nm. In the presence of AChE, acetylthiocholine (ACh) was hydrolyzed to thiocholine. Ag [I] ion could interact with thiocholine and thiocholine can reduce the oxidized TMB (oxTMB) to TMB, both of which suppressed the oxidation capacity of Ag [I] ion, resulting in a blue color fading and a decrease of the absorbance at 652 nm. The developed assay is highly sensitive with a low detection limit of 4.3 μU/mL. Moreover, the method was also applied in AChE inhibitor sensing. The obtained assay is fairly simple, inexpensive and sensitive without the utilization of nanomaterials, which may be not only used for the sensing of other hydrolytic enzyme activities with properly selected substrates, but also used for the screening of potential inhibitor drugs.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 110
·91056-91061
·
IF 3.84
Qian Zhang,Chen Zhou,Aisheng Huang
Based on a bio-inspiration polydopamine reaction platform, hollow Ag/carbon microporous spheres were facilely prepared through a template-assisted method. The hollow Ag/carbon spheres, with a uniform shell thickness of 30 nm and a high Ag loading, show high catalytic activity for the reduction of 4-nitrophenol by NaBH4 to 4-aminophenol. It is found that the 4-nitrophenol (10 mL, 1 × 10−3 M) can be completely converted to 4-aminophenol in 2 min by adding 20 mg of hollow Ag/carbon catalysts. The catalytic activity of the hollow Ag/carbon microporous spheres is also confirmed by CO oxidation. At 200 °C, 100% CO conversions can be achieved by using hollow Ag/carbon microporous spheres as catalysts, which is promising to replace other noble metal catalysts in metal catalyzed reactions.
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