MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Chuhong Zhu,Qiangsheng Zhao,Xiujuan Wang,Zhongbo Li,Xiaoye Hu
Concentration of analyte molecules on or nearby plasmonic nanostructures is crucial for sensitive SERS detection. In this paper, a functional SERS system made of Ag-nanocubes/graphene-oxide/Au-nanoparticles (Ag-NCs/GO/Au-NPs) composite film on a hydrophobic surface is constructed for effective accumulation and thus sensitive detection of target analyte in water. High density of plasmonic hotspots are generated between Au nanoparticles-assembled film and the Ag-NCs/GO hybrid, remarkably improving SERS activity. The hydrophobic surface is used to concentrate the analyte molecules in an aqueous droplet onto the Ag-NCs/GO/Au-NPs film during the droplet drying process. The hydrophilic graphene oxide sheets can adsorb analyte molecules nearby the plasmonic nanoparticles. The corners of Ag nanocubes, and the narrow nanogaps between neighboring palsmonic nanoparticles, could provide high density of hotspots for high SERS activity. Due to the effective accumulation of analyte molecules on/nearby hotspots, sensitive SERS detection of pesticides has been realized. The fabricated SERS platform was employed to successfully detect an aqueous solution of rhodamine 6G with an ultralow concentration (0.5 pM), conforming the high SERS sensitivity. To show the potential for practical application, SERS detection of pesticides such as thiram and thiabendazole in drinking-water was realized with limits of detection (LODs) ~ 0.37 ppb and ~ 8.3 ppb respectively. The functional SERS system may have promising applications in inspection of food safety, monitoring environmental pollutants and so on.
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BIOCHEMICAL ENGINEERING JOURNAL
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2020
·
IF 3.475
Hong Zhang,Chuance Cheng,Nalin Dong,Xiaoming Ji,Jiandong Hu
S1 nuclease plays an important role in DNA transcription, recombination and repair. Here, we synthesized a positively charged [email protected] core-shell nanoparticles ((+) [email protected] CSNPs) and used as highly stable and enhanced fluorescence quenching platform for one-step S1 nuclease activity detection. In the sensor, fluorophore labeled DNA was used as signal probe and its fluorescence signal could be effectively quenched based on the electrostatic interaction of it with (+) [email protected] CSNPs. In the presence of S1 nuclease, DNA probe was hydrolyzed into DNA fragments and cannot interact with (+) [email protected] CSNPs, inducing an obvious fluorescence signal increase that was proportional with S1 nuclease concentration in the range of 2.5 × 10 −4 –3.0 × 10 −2 U/mL. The enhanced quenching efficiency of (+) [email protected] CSNPs paved the way for sensitive S1 detection with a detection limit of 6.0 × 10 −5 U/mL. Moreover, the high stability of such nanocomposite can achieve the one-step detection of S1 in complex solution containing salt, protein or other metal ions. In addition, the method also exhibited high selectivity for nuclease detection, making our sensing platform has a potential application value in bioanalysis and clinical diagnosis.
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Bioactive Materials
·
2020
·
IF 8.724
Zhenhu Guo,Jingsong Lu,Dan Wang,Wensheng Xie,Yongjie Chi,Jianzhong Xu,Nonaka Takuya,Junxin Zhang,Wanling Xu,Fei Gao,Hong Wu,Lingyun Zhao
With tremendous research advances in biomedical application, liquid metals (LM) also offer fantastic chemistry for synthesis of novel nano-composites. Herein, as a pioneering trial, litchi-shaped heterogeneous eutectic gallium indium-Au nanoparticles (EGaIn-Au NPs), served as effective radiosensitizer and photothermal agent for radio-photothermal cancer therapy, have been successfully prepared using in situ interfacial galvanic replacement reaction. The enhanced photothermal conversion efficiency and boosted radio-sensitization effect could be achieved with the reduction of Au nanodots onto the eutectic gallium indium (EGaIn) NPs surface. Most importantly, the growth of tumor could be effectively inhibited under the combined radio-photothermal therapy mediated by EGaIn-Au NPs. Inspired by this approach, in situ interfacial galvanic replacement reaction may open a novel strategy to fabricate LM-based nano-composite with advanced multi-functionalities.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Qihao Zhu,Weiran Mao,Chengli Zhang,Yuan Zhou,Zhiyong Tang,Chao Yu
Here, a novel electrochemiluminescence biosensor based on potential-resolved strategy was firstly prepared for the detection of dual targets α2,3-sialylated glycans and α2,6-sialylated glycans. This is the first time that Au@BSA microsphere was used to connect with luminol to enhance its ECL intensity, and it can generate ECL signals at positive potential. Zeolitic Imidazolate Framework-8 (ZIF-8) and Meso-tetra (4-carboxyphenyl) porphyrin (TCPP) were linked using a one-pot method to synthesize a novel luminescent ZIF (L-ZIF) named TZZ, which can emit ECL signals at negative potential. Moreover, magnetite microspheres were used to construct a sandwich-type biosensor to obtain higher sensitivity and reduce background signals. In addition, the biosensor manufactured directly in solution have a wider linear range than constructed on electrode because it has more available space than the electrode surface. Due to the above advantages, the prepared ECL biosensor exhibited high sensitivity, stability and broader linear range, even for practical analysis. Therefore, the prepared ECL biosensor will become a promising method for determination of α2,3-sialylated glycans and α2,6-sialylated glycans in clinical applications in the future. What is more, it provides a potential method for detection of other multi-targets.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 17
·10167-10181
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IF 4.21
Guo Wanghuan,Zhao Zhigang,Yang Fan,Xie Meiying,Shao Zhiheng,Xue Liyan,Zhang Yang,Lin Wanqing,Du Chang,Zhang Yongjian
Abstract The separation and recovery of Au(III), Pd(II), and Pt(IV) is a challenge in hydrometallurgy, and finding good adsorbents is a way to solve this problem. In this work, two novel adsorbents, carboxymethyldiethylammoniumethyl cellulose (CM-n-DEAEC) and carboxymethyl-2-diethylaminoethyl cellulose (CM-o-DEAEC), were synthesized by changing the grafting site of carboxymethyl on diethylaminoethyl cellulose (DEAEC). The structures and morphologies of the adsorbents were examined by NMR, FT-IR, EA, TGA, and SEM analyses. The effects of adsorbents on the separation performance of Au(III), Pd(II), and Pt(IV) at different adsorption conditions were studied. The performances of stripping and recycling were investigated. At a 3 M chloride ion concentration, CM-n-DEAEC's adsorption rates for Pd(II), Au(III), and Pt(IV) were stabilized at 60%, 30%, and 7% in the pH range of 1.0–3.0 and were unaffected by coexisting metal ions. However, at a 0.1 M chloride ion concentration, CM-o-DEAEC separated Pt(IV) before Au(III) and Pd(II) in the pH range from 1.0 to 2.0 without being affected by coexisting metal ions. In addition, the absorbed metal ions can be easily stripped by a 0.1 M thiourea-0.1 M HCl solution, and the adsorption rate only decreased by 3.0% and 1.8% after seven adsorption–desorption cycles. Therefore, it was shown that CM-n-DEAEC and CM-o-DEAEC are excellent adsorbents that can control the adsorption order of precious metals and can selectively and quickly recover Pd(II) or Pt(IV) from wastes containing Au(III). Graphic abstract
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HYDROMETALLURGY
·
2020
·
IF 3.338
Kaige Sun,Shangjian Mao,Weiquan Zhan,Chang Liu,Feifei Jia,Shaoxian Song
Magnetic MoS 2 could be easily separated from water or solid suspensions. In this work, shell-core structured MoS 2 @Fe 3 O 4 composite was fabricated through hydrothermal method and used as catalyst for recovering gold-thiosulfate complex ions (Au(S 2 O 3 ) 2 3− ) in aqueous solution. The results suggested that MoS 2 @Fe 3 O 4 composite could effectively in-situ reduce Au(S 2 O 3 ) 2 3− to gold particles (Au 0 ) with an extremely high reduction capacity of 1541.1 mg/g; moreover, the gold loaded MoS 2 @Fe 3 O 4 could be easily collected using a magnetic separator. The mechanism of reducing Au(S 2 O 3 ) 2 3− to Au 0 was ascribed to the photoexcited electrons from MoS 2 @Fe 3 O 4 composite. More importantly, the incorporation of Fe 3 O 4 could effectively enhance the transferred efficiency of photoexcited electrons and accelerate separation of electrons-holes pairs. With great gold reduction capacity and magnetic recyclability , the MoS 2 @Fe 3 O 4 composite could be a promising material for recovering gold from leaching solutions.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
·
IF 3.807
Lihua Li,Yan Wei,Shengpeng Zhang,Xishan Chen,Taili Shao,Dexiang Feng
A multiple immunosensor was developed for simultaneous detection of prostate specific antigen (PSA), carcinoembryonic antigen (CEA) and α-fetoprotein (AFP). In this sensing platform, metal ions functionalized gold nanoparticles-carbon nanospheres (CNSs@Au NPs) nanocomposites were firstly synthesized not only as an efficient immunoprobe but also as signal amplifier. Herein, CNSs@Au NPs with large specific surface area and excellent biocompatibility provided a good vehicle to load much more second antibodies. Metal ions (Pb 2+ 、Cd 2+ 、Zn 2+ ) were fixed the surface of nanocomposites via strong binding capacity with amino-groups of second antibodies to form a signal amplifying system. Meanwhile, immunosensor was prepared by depositing Au NPs and coating primary antibodies on the glassy carbon electrode. In the existence of target analytes and immunoprobes, the immunosensor could simultaneously respond to multiple analyte targets and three distinguishable signal peaks of square wave voltammetry (SWV) were obtained. Under appropriate experimental conditions, the proposed immunosensor exhibited wider measurement linear ranges for three markers (PSA, 0.01 to 100 ng mL −1 , CEA and AFP, 0.01 to 80 ng mL −1 ) with a low detection limits of PSA (3.6 pg mL −1 ), CEA (3.0 pg mL −1 ) and AFP (2.6 pg mL −1 , S/N = 3). Finally, the as-prepared immunosensor was assessed with human serum samples. Compared with the reference method, no obvious difference was observed, indicating our immunosensor had a potential application in early clinical diagnosis of tumor markers.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Zhe Wang,Jiangjiang Feng,Xiaoliang Li,Rena Oh,Dongdong Shi,Ouardia Akdim,Ming Xia,Liang Zhao,Xiaoyang Huang,Guojie Zhang
TiO 2 nanocrystals with controlled facets have been extensively investigated due to their excellent photocatalytic performance in sustainable and green energy field. However, the applications in thermal catalysis without applying UV irradiation are comparably less and the identification of their intrinsic roles, especially the different catalytic behaviors of each crystal facet, remains not fully recognized. In this study, bimetallic AuPd nanoparticles supported on anatase TiO 2 nanosheets exposing {0 0 1} facets or TiO 2 nanospindles exposing {1 0 1} as a catalyst were prepared by sol-immobilization method and used for solvent-free benzyl alcohol oxidation . The experimental results indicated that the exposed facet of the support has a significant effect on the catalytic performance. AuPd/TiO 2 -001 catalyst exhibited a higher benzyl alcohol conversion than that of the AuPd/TiO 2 -101. Meanwhile, all the prepared AuPd/TiO 2 catalysts were characterized by XRD , ICP-AES, XPS, BET, TEM, and HRTEM . The results revealed that the higher number of oxygen vacancies in TiO 2 -sheets with the exposed {0 0 1} facets of higher surface energy could be responsible for the observed enhancement in the catalytic performance of benzyl alcohol oxidation. The present study displays that it is plausible to enhance the catalytic performance for the benzyl alcohol oxidation by tailoring the exposed facet of the TiO 2 as a catalyst support.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
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2020
·
IF 2.929
Shaoxia Wang,Meirong Shen,Jianfei Qu,Xuming Zhuang,Shou-Qing Ni,Xuran Wu
In this study, mercapto-modified graphene/multi-walled carbon nanotube aerogels were facilely constructed by using L-cysteine as a cross-linking agent and modifier. The effective adsorption behaviors of Au(III) from environmental samples by the aerogels were investigated. The aerogels were characterized, and many influencing factors, such as pH value, adsorbent dosage, and contact time, were optimized. The kinetic data followed the pseudo-second-order model, and the equilibrium data fitted well to the Freundlich isotherm model. The maximum adsorption capacity for Au(III) reached approximately 47 mg g −1 . Moreover, the Au(III) could be desorbed with 1 M HCl containing 4% thiourea and detected by inductively coupled plasma atomic emission spectroscopy. Finally, the aerogels were used in lake water, seawater, and soil samples for Au(III) adsorption with recovery rates from 87.0% to 102.8%. The results indicate that the developed aerogel is an excellent adsorbent for removing Au(III) from samples and has significant application prospects in environmental research.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xiuzhen Zheng,Zhuo Zhang,Sugang Meng,Yaxiao Wang,Danzhen Li
Plasmonic photocatalytic degradation and photoelectrochemical water splitting is very promising in the process of ecological environment protection. However, the efficiencies reported are still too low for practical application due to the high recombination of photogenerated electrons and holes, which can be improved by optimizing the design and assembly of highly ordered pore structures. In our work, a composite plasmonic metal/semiconductor photocatalyst, Au/ZnO hybrid inverse-opal nanomaterial (Au/ZnO-IO), was prepared by in-situ grown Au nanoparticles on inner and outer of ZnO framework. The 3D ordered Au/ZnO-IO photocatalyst exhibited excellent photocatalytic activity in bisphenol A degradation and photoelectrochemical water splitting. The improved photoactivities were proved to be caused by the increased light absorption and special charge transfer of photogenerated electrons, which significantly restraint the recombination rate and prolong the lifetime of photoexcited carries. Based on the analysis of active species experiments, photoelectrochemical measurements, energy level of schottky junction and finite-difference time-domain (FDTD) simulations, the degradation mechanism on Au/ZnO-IO nanocomposite was supposed. This work provides insights into the charge transfer regulation by constructing the 3D plasmonic metal/semiconductor inverse-opal photocatalyst and may serve as a promising strategy for photocatalytic degradation of organic pollutants and water splitting.
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Nanoscale
·
2020
·Vol. 12
·期 10
·6195-6203
·
IF 6.895
Suisui He,Jian Chai,Siyu Lu,Xijiao Mu,Ruitong Liu,Qiang Wang,Fengjuan Chen,Yuee Li,Jingang Wang,Baodui Wang
Vertical heterojunctions of two-dimensional (2D) semiconducting materials have attracted more and more research interest recently due to their unique optical, electrical, and catalytic properties and potential applications. Although great progress has been made, vertical integration of the layered materials formed by 2D semiconductor nanosheets and 2D plasmatic metal nanosheets remains a huge challenge. Here, we demonstrate for the first time a solution-phase growth of vertical plasmatic metal–semiconductor heterostructures in which aligned NiCo2O4 nanosheet arrays vertically grow on a single Au nanosheet, forming vertically aligned NiCo2O4–Au–NiCo2O4 sandwich-type heterojunctions with hierarchical open channels. Such vertical NiCo2O4–Au–NiCo2O4 heterojunctions can effectively promote the separation and transfer of a photoinduced charge. Density functional theory (DFT) studies and time-resolved transient absorption spectroscopy show that electrons transfer from NiCo2O4 to Au, and the formation of the heterojunction weakens the H–O bond of H2O. Due to the unique structure and superiority of the component, the vertical NiCo2O4–Au–NiCo2O4 heterojunctions exhibit significant activity with an O2 production rate of up to 33 μmol h−1 and long-term stability for photocatalytic water oxidation. We calculated the apparent quantum efficiency (AQE) to be 21.9% for NiCo2O4–Au–NiCo2O4 heterojunctions at the wavelength λ = 450 ± 10 nm, which is higher than that of NiCo2O4 nanosheets (10.9%), Au nanosheets (0.96%) and other photocatalysts. The present study paves the way for the controlled synthesis of novel vertical heterojunctions based on 2D semiconductor nanosheets and 2D metal nanosheets for efficient photocatalysis.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 7
·2209-2217
·
IF 4.174
Wenyan Kong,Qi Wang,Guoying Deng,Hang Zhao,Linjing Zhao,Jie Lu,Xijian Liu
Photothermal therapy (PTT) is a promising treatment for tumors due to its efficiency and non-invasiveness. However, during the PTT treatment, reactive oxygen species (ROS) are produced in response to hyperthermia and thus harm the neighboring normal cells. In this work, a multifunctional theranostic agent (Se@SiO2@Au-PEG/DOX NCs) was exploited to solve this problem by introducing selenium, which can efficiently prevent normal cells from oxidative damage by scavenging reactive oxygen species during photothermal therapy. In addition, the Se@SiO2@Au-PEG/DOX nanocomposites (NCs) not only exhibited excellent properties of combined chemo-thermal synergistic therapy, but also showed no appreciable toxicity towards normal tissues due to the protective effect for continuous release of selenium. Thus, the fabricated Se@SiO2@Au-PEG/DOX NCs provide an integrated solution to overcome the limitations of selenium and PTT, and demonstrate great prospects as a safe and highly reliable theranostic agent.
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