NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 14
·11573-11582
·
IF 3.201
Saisai Yan,Wanying Wei,Zhinong Gao,Yan Xia,Jia Han
Surfactants have proven to be the best shape directing agents for the synthesis of desired nanomaterials. Herein, a series of cationic gemini surfactants with pyrrolidinium head groups and a hydroxyl-substituted spacer (Cn-3OH-nPB, n = 10, 12, 14 and 16) were synthesized, characterized and investigated by surface tension, electrical conductivity, steady-state fluorescence, dynamic light scattering (DLS) and transmission electron microscopy (TEM) measurements for their surface activity and aggregation behaviors in aqueous solution. Their critical micelle concentrations (CMCs) followed the order of C10-3OH-10PB > C12-3OH-12PB > C14-3OH-14PB > C16-3OH-16PB and the aggregation tendency was enhanced as the hydrocarbon chain length increased. Interestingly, C16-3OH-16PB performed particularly prominently with respect to both the surface-active properties and the preparation of dendritic Au nanocrystals (NCs) compared to others with different hydrocarbon chain lengths. Dendritic Au NCs can be facilely prepared by a one-pot method at room temperature with C16-3OH-16PB as the stabilizing agent and structure director. Meanwhile, the other reaction parameters involved including the reaction time and the concentration of the gemini surfactant, AA and HAuCl4 were also investigated in order to evaluate the optimal conditions for the formation of dendrites. Moreover, the dendritic Au NCs exhibited good surface-enhanced Raman scattering (SERS) sensitivity toward crystal violet (CV), suggesting their potential application in SERS-based detection and analysis. This facile synthetic method for creating dendritic Au NCs based on a gemini surfactant may open viable opportunities and provide inspiration for future studies on the preparation of shape-controlled Au NCs.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Dandan Ma,Jian-Wen Shi,Diankun Sun,Yajun Zou,Linhao Cheng,Chi He,Zeyan Wang,Chunming Niu
Au nanoparticle (NP)- and CdS quantum dot (QD)-codecorated In2O3 nanosheets, assembled into flowerlike structure (In2O3/Au/CdS), were synthesized to facilitate photocatalytic H2 production. The optimized In2O3/Au4/CdS-12 (4 wt % Au NPs and CdS QDs were deposited for 12 cycles) displays achieved a photocatalytic hydrogen generation ability of 17.23 μmol/h (10 mg of catalyst), which is 22.97, 5.08, and 5.05 times as high as that of pristine In2O3 (0.75 μmol/h), In2O3/Au4 (3.39 μmol/h), and In2O3/CdS-12 (3.41 μmol/h), respectively. This significant improvement of H2 generation rate can be attributed to the following factors: the heterojunction at the In2O3–CdS interface and the Schottky barrier at the interface between In2O3–Au and CdS–Au improves the migration and separation of charge carriers, and the surface plasma resonance (SPR) effect of noble metal Au NPs enhances the light harvesting capacity of In2O3 and boosts the generation of hot electrons, efficiently improving the utilization rate of sunlight.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yue Chen,Tong Wu,Guoliang Xing,Yichuan Kou,Boxun Li,Xinying Wang,Ming Gao,Lei Chen,Yaxin Wang,Jinghai Yang,Yang Liu,Yongjun Zhang,Dandan Wang
In this study, the three-dimensional (3D) flowerlike porous Fe3O4 microcrystals were prepared by a self-assembly approach with the assistance of ethylene glycol (EG). The generation mechanism of the 3D flowerlike Fe3O4 microcrystals was revealed through controlling the parameters of the hydrothermal reaction time, the molar mass of the urea, and the calcination temperature. The proposed 3D flowerlike Fe3O4 microcrystals exhibited superparamagnetic behaviors with high saturation magnetization (i.e., up to 73.1 emu·g–1) at room temperature. The Fe3O4–Au magnetic composites (MCs) were further prepared by a seed deposition process, and surface features were revealed by TEM, XRD, XPS, UV–vis, and SQUID techniques. Compared with the Fe3O4 microcrystals themselves, the Au (∼20 nm) covered Fe3O4 microcrystals provided efficient and recyclable catalytic performance (e.g., unprecedented high turnover frequency of 2.874 min–1) for 4-nitrophenol (4-NP). More importantly, the proposed Fe3O4–Au MCs could be used to reduce 4-NP for more than six cycles, elaborating that Fe3O4–Au MCs are promising catalysts in the field of environmental purification.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2019
·Vol. 50
·期 8
·1074-1084
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IF 2.809
Shuang Lin,Xiang Lin,Xueying Song,Siqingaowa Han,Li Wang,Wuliji Hasi
Surface-enhanced Raman scattering (SERS) substrate is the key to SERS technology and it is still a basic focus to fabricate desirable SERS substrates offering multiple advantages of strong Raman enhancement and good reproducibility and portability. A flexible paper-based SERS substrate were fabricated involving the use of Au nanocubes (NCs) monolayer. Au NCs were generated with tunable size in the range of 24 to 63 nm through seed-mediated growth method. The effect of support on SERS properties of Au NCs–assembled monolayer was systemically explored. As a result, more excellent SERS performance could be obtained by assembling Au NCs on the filter paper. Besides, the influence of Au NCs' size on SERS-enhanced effect of paper-based substrate was also investigated. Our results clearly indicated that paper-based substrate with 39 nm Au NCs possessed the optimal SERS enhancement. This SERS substrate exhibited high sensitivity with enhancement factor (EF) up to 9.75 × 10 7 and demonstrated good uniformity and time stability. Furthermore, based on this superior paper-based SERS substrate with advantage of powerful sample extraction performance, the measurement of crystal violet (CV) on shell surface were successfully carried out with detection limit down to 2.17 × 10 −7 M. And linear quantification were achieved in the range from 5 × 10 −5 to 5 × 10 −7 M. To sum up, the as-prepared SERS substrate is applicable for on-site detection and analysis of CV on various shell surfaces.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Bin Wang,Tie-yan Chang,Xiang Gong,Zhao Jiang,Sen Yang,Yu-sheng Chen,Tao Fang
The unsatisfactory performance of dehydrogenation catalysts has been the bottleneck for liquid organic hydrogen carrier (LOHC) development. After systematic experiments, the Au/Pd core/shell catalysts were screened from a series of Pd–M (M = Au, Ag, Ru, Rh) combinations for dehydrogenation of dodecahydro-N-ethylcarbazole (12H-NEC) through a one-pot wet chemical synthesis. The ratio of Pd to Au is also within the scope of the experiment, and it was found that the catalytic activity was following the order of Au1Pd1.3 > Au1Pd2 > Au1Pd1 > Ru1Pd1.3 > Au1Pd0.7 > Rh1Pd1.3 > Ag1Pd1.3 supported on rGO for the dehydrogenation process. Au1Pd1.3/rGO greatly improves the efficiency of the dehydrogenation reaction, specifically; while maintaining selectivity and conversion rate of 100%, the reaction time was shortened by 43% compared to the monometallic Pd/rGO catalyst with the highest activity we prepared before, and compared to the best performing bimetallic catalyst in the literature, the optimal reaction time in this work was reduced by 71% when the hydrogen storage requirements of the US DOE (Department of Energy) are met. A cycle performance experiment was performed to verify its excellent catalytic stability. Further catalyst characterization also proves that it has good morphology and stability. A kinetics calculation was carried out to obtain fundamental reaction parameters.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
·
IF 2.88
Jian Zhu,Tian-Tian Jia,Jian-Jun Li,Xin Li,Jun-Wu Zhao
In this work, we develop a simple and selective sensing method for the detection of mercury ions based on surface plasmon resonance (SPR) spectrum change of Au-Ag core-shell triangular nanoplates . When the concentration of mercury is increased, the etching-induced change of particle size and shape also leads to the decrease of the absorption peak at the fixed wavelength, until a spectrum dip takes place. This spectral change of “peak-to-dip” greatly enlarges the detection range of mercury ions, which could be fine tuned by changing the initial thickness of the Ag coating. Under optimal conditions, the decrease of the logarithmic absorption intensity has a good linear response with the concentration of mercury ions increasing from 10 to 1000 μM, and the limit of detection (LOD) is 0.88 μM. Interference studies and real samples test indicate that, this new sensing method has a good selection for mercury ions and can be practically used in lake water. This work shows the surface etching-induced SPR shift can also leads to the intensity change with “peak-to-dip” fashion, which greatly enlarge the concentration range of the detection and could be widely applied in the spectroscopy sensing based on SPR.
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BIOSENSORS & BIOELECTRONICS
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2018
·
IF 8.173
Han Yang,Jie Zhao,Meijia Qiu,Peng Sun,Dongxue Han,Li Niu,Guofeng Cui
In this work, Pt nanoparticles modified nanoporous AuSn(Pt@NP-AuSn) alloy on Ni buffered flexible carbon fiber paper (CFP) is fabricated by a simple replacement reaction in which NP-AuSn is fabricated by controllable dealloy of electrodeposited Au-Sn alloy films. The as prepared Pt@NP-AuSn/Ni/CFP possesses hierarchical pore structure , high specific surface area and excellent catalytic activity . Due to the bi-functions of both the large surface area of nanoporous metal and macroporous of carbon fiber paper facilitating mass transfer, the Pt@NP-AuSn/Ni/CFP shows high sensitivity of detecting ascorbic acid (AA), dopamine (DA) and uric acid (UA), with sensitivities of 0.14 μA μM −1 cm −2 , 15.23 μA μM −1 cm −2 , 0.28 μA μM −1 cm −2 under the concentration ranging from 200 to 2000 μM, 1–10 μM, and 25–800 μM for AA, DA and UA, respectively. Further, the Pt@NP-AuSn/Ni/CFP possesses long-term stability of sensing AA, DA and UA and presents great anti-interference towards a variety of common compounds in body fluid. All of these results manifest the Pt@NP-AuSn/Ni/CFP can be a promising candidate for the application of the electrochemical sensor for simultaneous detection of AA, DA and UA.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Meiling Wang,Jianwei Zhao
A new facile in situ reduction approach for the preparation of an ionic liquid of 1-allyl-3-methylimidazolium chloride (AMIM-Cl) functionalized reduced graphene oxide supported Au nanoparticle (ILRGO-Au) composite was demonstrated in this work. With the assistance of AMIM-Cl, ILRGO were dispersed easily in aqueous solution and exhibited an improved conductivity. Meanwhile, the Au nanoparticles uniformly loaded on the surfaces of the ILRGO which can increase the specific surface area as well as accelerate electron transfer. These advantages made the ILRGO-Au composites were successfully employed in the fabrication of facile and sensitive electrochemical sensor applied to the simultaneous determination of Sunset yellow (SY) and Tartrazine (Tz) in drinks. In the presence of constant concentration of one of the components, the concentrations of SY or Tz gave linear response ranges equal to 4.0 × 10 −9 to 1.0 × 10 −6 for SY and 7.0 × 10 −9 to 1.5 × 10 −6 M for Tz with detection limits of 5.2 × 10 −10 for SY and 8.3 × 10 −10 M for Tz (S/N = 3), respectively. The new sensor showed good reproducibility and repeatability toward simultaneous determination of SY and Tz, indicating its potentials in detection of other food colorants.
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Catalysis Science & Technology
·
2014
·Vol. 5
·期 2
·1314-1322
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IF 4.76
Zhenzhen Miao,Yibo Zhang,Xiqiang Pan,Tianxiao Wu,Bin Zhang,Jingwei Li,Ting Yi,Zhendong Zhang,Xiangguang Yang
Porous Bi-doped ceria (Ce1−xBixO2−δ solid solution) was prepared by the easy citrate method and then used as a supporting material for Au nanoparticles (NPs) obtained by deposition–precipitation. In the presence of O2, Ce1−xBixO2−δ (0.08 ≤ x ≤ 0.5) efficiently catalyzed the conversion of 5-hydroxymethylfurfural (HMF) to 5-hydroxymethyl-2-furancarboxylic acid (HFCA) and 2,5-bishydroxymethylfuran (BHMF) in alkaline aqueous solution without degradation of HMF. The excellent catalytic activity was attributed to the oxygen activation and hydride transfer enhanced by Bi doping and the large amount of oxygen vacancies. After Au NPs were supported on Ce1−xBixO2−δ (x ≤ 0.2), the presence of Auδ+ facilitated the activation of the C–H bond in the hydroxymethyl group and then the production of 2,5-furandicarboxylic acid (FDCA) as an end product, inhibiting the generation of BHMF.
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Scientific Reports
·
2014
·Vol. 4
·期 1
·1-9
·
IF 5.078
Wang Fei,Liu Pei,Sun Lin,Li Cuncheng,Petrenko Valery A.,Liu Aihua
Nanomaterials with near-infrared (NIR) absorption have been widely studied in cancer detection and photothermal therapy (PTT), while it remains a great challenge in targeting tumor efficiently with minimal side effects. Herein we report a novel multifunctional phage-mimetic nanostructure, which was prepared by layer-by-layer self-assembly of Au@Ag heterogenous nanorods (NRs) with rhodamine 6G and specific pVIII fusion proteins. Au@Ag NRs, first being applied for PTT, exhibited excellent stability, cost-effectivity, biocompatibility and tunable NIR absorption. The fusion proteins were isolated from phage DDAGNRQP specifically selected from f8/8 landscape phage library against colorectal cancer cells in a high-throughput way. Considering the definite charge distribution and low molecular weight, phage fusion proteins were assembled on the negatively charged NR core by electrostatic interactions, exposing the N-terminus fused with DDAGNRQP peptide on the surface. The fluorescent images showed that assembled phage fusion proteins can direct the nanostructure into cancer cells. The nanostructure was more efficient than gold nanorods and silver nanotriangle-based photothermal agents and was capable of specifically ablating SW620 cells after 10 min illumination with an 808 nm laser in the light intensity of 4 W/cm 2 . The prepared nanostructure would become an ideal reagent for simutaneously targeted optical imaging and PTT of tumor.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 21
·11003-11011
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IF 3.708
Wenjun Liu,Dengrong Sun,Jinlong Fu,Rusheng Yuan,Zhaohui Li
Thiol-functionalized reduced graphene oxide (SRG) was prepared by coupling the carboxyl groups on the pre-carboxyl-functionalized graphene oxide (GO) with cysteamines through amide bonds. The as-prepared SRG can function both as a support and reducing agent for the formation of Au/SRG nanohybrids with evenly distributed Au nanoparticles on RGO. The thiol linkage on the RGO can act as anchor for Au nanoparticles and due to the existence of the strong interaction between them, the agglomeration of Au nanoparticles can be significantly impeded. The step-by-step assembly process of the Au/SRG nanohybrid was monitored and the products obtained were characterized by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray absorption near-edge spectroscopy (XANES), atomic force microscopy (AFM), powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The as-prepared Au/SRG nanohybrid showed superior catalytic performance for the hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). It is expected that the method for the preparation of the Au/SRG nanohybrids can also be applied to the preparations of other RGO-based nanohybrid materials which may find a variety of interesting applications.
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ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Chaohui Chen,Ningxing Li,Jingwen Lan,Xinghu Ji,Zhike He
A target-catalyzed hairpin assembly (CHA) and graphene/Au-NPs hybrids-based platform has been developed for the determination of DNA . This new sensor not only avoided any labeling but also reduced the background signal. In the absence of target, the assembly of H1 and H2 couldn't be triggered. The catalytic activity of graphene/Au-NPs hybrids was inhibited by adsorption of H1 and H2, leading to the “inactive” hybrids unable to catalyze the oxidation reaction of 3,3′,5,5′-tetramethylbenzidine (TMB). However, with the addition of target DNA, the target-catalyzed hairpin assembly was initiated and produced plenty of H1–H2 duplex, which had a weak binding affinity with the graphene/Au-NPs. Thus, the protected interface of graphene/Au-NPs hybrids became active and catalyzed the oxidation reaction of TMB accompanied with a colorless to-blue color change. This approach exhibited good sensitivity and specificity for target DNA with a detection limit of 5.74 × 10 −11 M, and realized the assay of target DNA in human serum samples. Besides, this sensor could be further expanded to detect viruses or proteins by adapting the corresponding aptamers, showing great potential in biochemical detections.
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