SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Han Lu,Mingliang Jin,Qilin Ma,Zhibin Yan,Zhenping Liu,Xin Wang,Eser Metin Akinoglu,Albert van den Berg,Guofu Zhou,Lingling Shui
In this work, we report a quick and controllable method for fabricating Ag nanoparticles (NPs) and nano-assemblies (NAs) on silicon (Si) surface via a galvanic reaction assisted by surfactant hexadecyltrimethylammonium bromide (CTAB). Obtained Si substrates with high density Ag NAs serve as surface-enhanced Raman scattering (SERS) substrates for unlabelled molecular sensing. The addition of CTAB enables not only the electromagnetic enhancement by controllable producing Ag NAs “hotspots”, but also the signal enhancement by enriching probe molecules via hydrophobic interaction. Two concentration regimes of 1.0 × 10 −8 –1.0 × 10 −11 M and 1.0 × 10 −12 –1.0 × 10 −16 M have been obtained for quantitative and qualitative detection of Rhodamine 6G (R6G) in aqueous solution, respectively. As a result, for determination of R6G, the quantitative and qualitative detection limits of 1.0 × 10 −11 and 1.0 × 10 −16 M have been obtained, respectively, with high reproducibility showing the relative standard deviation (RSD) of ∼7.3%. Simulation has been carried out using finite-difference time-domain (FDTD) to evaluate the dependence of electric field on the size and inter-gap of Ag NPs, showing good agreement with experimental results. The high sensitivity also enables SERS characterization of non-resonant and low Raman cross-section biomolecules, for example, amino acids. Such a fabrication process is simple, fast, cheap and reproducible; and therefore, it would be helpful to produce high sensitive SERS substrates to broaden their applications in chemical and biological fields for molecular diagnostics to single-/multiple-molecule detection.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 412
·期 4
·881-894
·
IF 3.286
Xiao Li,Sun Qi,Zhao Qiang,Cheng Xinjian
The detection of heavy metals such as Hg 2+ and Ag + is important and urgent. In this work, – NO 2 /– NH 2 /C=S boron dipyrromethene small molecular derivatives were synthesized at first. Then they were incorporated into polymer chains. The macromolecular fluorescent probes were obtained via Sonogashira reaction using the small molecular probes as building blocks. The as-prepared small-molecule fluorescent probe BO3 exhibits high sensing performance for Hg 2+ . By introducing it into macromolecules, the sensing ability still remains, and even more, the recognition performance is improved. The macromolecular fluorescent probes P1 , P2 , and P3 also have high recognition ability for Ag + with a binding ratio of 2:1 (metal ion to probe ratio). Through the study of the sensing mechanism and the recycling experiments, it is found that the probes responded by the photo-induced electron transfer mechanism and can be recycled and reused. At the same time, BO3 , P2 , and P3 show excellent recognition performance for Hg 2+ in living cells and zebrafish. Living cell imaging experiments indicated that these fluorescent probes had good cell membrane permeability and low cytotoxicity, and could realize bioimaging of Hg 2+ . Therefore, the application value of these fluorescent probes could be enlarged.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
·
IF 2.752
Hongji Li,Yan Wang,Yue Li,Jinyue Zhang,Yu Qiao,Qingwei Wang,Guangbo Che
As a sensitive analytical technique, surface-enhanced Raman scattering (SERS) is widely used in spectral analysis, single molecule detection and biological/chemical sensors. Noble-metal nanostructures have sensitive SERS properties and usually act as SERS substrates. Moreover, semiconductors also possess SERS properties and when the semiconductors are combined with noble metals this can not only enhance the SERS signal but also introduce additional properties. Therefore, in this investigation, SiO 2 @TiO 2 @Ag composite materials are selected as SERS substrates, which not only increase the SERS property of substrates but also introduce the property of self-cleaning under conditions of UV light . The molecularly imprinted technique (MIT) is combined with SERS in this investigation to improve the disadvantage of traditional SERS substrates having low selectivity . Molecularly imprinted polymers (MIPs) have specific adsorption properties that can enrich the templates on the surface of SiO 2 @TiO 2 @Ag composites. Importantly, the MIPs can prevent the SERS substrate being oxidized, which effectively protects the core materials. Hence, SiO 2 @TiO 2 @Ag@MIPs is synthesized based on SERS and MIT for used in pyrethroid detection. The Raman intensity and fenvalerate concentration show a good linear relationship in the FE range of 1.0–100 nmol l −1 and the detection limit is 0.2 nmol l −1 . Furthermore, the SiO 2 @TiO 2 @Ag@MIPs present good selectivity and self-cleaning. This investigation provides a novel approach to pyrethroid detection.
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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.
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CATALYSIS TODAY
·
2019
·
IF 4.888
Qiong Liu,Ertao Liu,Ju Li,Yuan Qiu,Rong Chen
Spindle-like Ag/ZnO nanostructure has been successfully synthesized via an ultrasonic-microwave combined assisted method. The as-prepared Ag/ZnO nanocomposites exhibited enhanced photodegradation efficiency for organic pollutants than pure ZnO and commercial TiO 2 (P25) under visible light irradiation, which was probably due to the surface plasmon resonance (SPR) effect of Ag nanoparticles . The production of hydroxyl radicals ( OH) under visible light irradiation was greatly promoted via loading Ag nanoparticles on the surface of ZnO nanostructures, also resulting in the improved photocatalytic activity. Moreover, the spindle-like Ag/ZnO nanocomposites displayed excellent antibacterial activities for both Gram-positive and Gram-negative bacteria. The Ag/ZnO nanocomposites could penetrate and damage cell membrane, causing the leakage of cytosol and the inactivation of respiratory chain dehydrogenase. The synergistic effect of Ag and ZnO is also beneficial for the mass production of H 2 O 2 , leading to the enhanced antibacterial activities of nanocomposites.
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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.
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Food Analytical Methods
·
2019
·Vol. 12
·期 9
·2094-2105
·
IF 2.413
Yaseen Tehseen,Pu Hongbin,Sun Da-Wen
The sensitivity of surface-enhanced Raman spectroscopy (SERS) extremely relies on experimental parameters including pH and aggregating agents. Using Au@Ag nanoparticles (NPs) with 26 nm Au core size and 6 nm Ag shell thickness as the substrate, the effect of cationic (Ca 2+ , K + , Na + ) and anionic (Cl − , Br − ) aggregating agents was investigated on the SERS detection of phosalone. The optimum concentrations of the aggregating agents in relation to the maximum SERS intensity differed broadly from 1 × 10 −2 mol/L for CaBr 2 to 1 × 10 1 mol/L for KCl. Both anions and cations greatly affected the SERS enhancement. With employing Br − as the anion, Ca 2+ and K + showed the maximum SERS intensities for phosalone, while using Ca 2+ as the cation, Br − produced the maximum SERS enhancement. Among these aggregating agent combinations, the maximum SERS enhancement was achieved by employing 1 × 10 −2 mol/L CaBr 2 at pH 3.0. The detection limits of phosalone in standard solution and peach were 0.02 mg/L and 0.2 mg/kg, respectively. This study demonstrated that the Au@Ag NP-based SERS approach could be used as a sensitive, rapid, and simple method for detecting trace contaminants in food matrices.
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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.
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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.
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SENSORS AND ACTUATORS B-CHEMICAL
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2014
·
IF 3.84
Weiyan Liu,Hongmei Yang,Shenguang Ge,Lei Shen,Jinghua Yu,Mei Yan,Jiadong Huang
In this paper, PtPd alloy decorated reduced graphene oxide (RGO/PtPd) was synthesized by a simple and green method. The RGO/PtPd could catalytic oxidation of H 2 O 2 to form O 2 and O 2 acted as the coreactant of peroxydisulfate, could greatly amplify the ECL signal. Moreover, the RGO/PtPd exhibited higher catalytic activity compared to the RGO/Pt or RGO/Pd catalyst because of the synergetic effects of Pt and Pd and the enhanced electron transfer of RGO. Based on this, a highly sensitive and selective label-free electrochemiluminescence (ECL) aptasensor for detection of adenosine triphosphate was designed. In this process, RGO/PtPd could be regarded as mimicking enzyme, the effect of which was similar to horseradish peroxidase in generating O 2 and also used as carriers to immobilize ssDNA2. With respect to sensitivity, Ag dendrites with hierarchical nanostructures were electrodeposited on working electrode of portable indium tin oxide device, which improved the electronic transfer rate as well as increased the amount of immobilized capture ssDNA1. Under the optimal conditions, the approach provided a linear range from 0.1 pM to 50 nM and a low detection limit of 0.037 pM.
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CRYSTENGCOMM
·
2013
·Vol. 16
·期 12
·2384-2394
·
IF 3.879
Zhifeng Jiang,Jianjun Zhu,Dong Liu,Wei Wei,Jimin Xie,Min Chen
Considering that the reduction of particle size can increase the number of active sites, particle size is accepted to be the key factor in the design of photocatalysts. However, serious agglomeration of nanosized particles may cause not only a decreased surface area but also increase grain boundary recombination. Forming a hollow nano-hemisphere in single crystals with reactive sites could be a good method to overcome this drawback. In this work, we report the synthesis of novel anatase TiO2 hollow nano-hemispheres by using a mixture of CH3COO− and F− as size and morphology controlling co-agents that prevent aggregation and increase the number of active sites. Furthermore, bimetallic Ag/Pt nanoparticles (NPs) are uniformly loaded on both interior and exterior of the nano-hemispheres in situ. The Ag/Pt@TiO2 NPs with improved visible-light-harvesting ability, high charge–hole mobility, and low electron–hole recombination exhibited improved photocatalytic performance in the degradation of rhodamine B/ciprofloxacin (RhB/CIP) and hydrogen generation. The results presented here give a promising way toward the development of delicate bimetal@semiconductor composites for board applications in photocatalysis.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2014
·Vol. 406
·期 25
·6337-6346
·
IF 3.578
Chen Peng,Wang Zhuyuan,Zong Shenfei,Chen Hui,Zhu Dan,Zhong Yuan,Cui Yiping
p -Aminothiophenol (pATP) functionalized multi-walled carbon nanotubes (MWCNTs) have been demonstrated as an efficient pH sensor for living cells. The proposed sensor employs gold/silver core-shell nanoparticles (Au@Ag NPs) functionalized MWCNTs hybrid structure as the surface-enhanced Raman scattering (SERS) substrate and pATP molecules as the SERS reporters, which possess a pH-dependent SERS performance. By using MWCNTs as the substrate to be in a state of aggregation, the pH sensing range could be extended to pH 3.0∼14.0, which is much wider than that using unaggregated Au@Ag NPs without MWCNTs. Furthermore, the pH-sensitive performance was well retained in living cells with a low cytotoxicity. The developed SERS-active MWCNTs-based nanocomposite is expected to be an efficient intracellular pH sensor for bio-applications.
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