Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 20
·5167-5174
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IF 4.696
Rui Tian,Mingwan Li,Haiyan Teng,Heng Luo,Dongpeng Yan,Min Wei
Surface-enhanced Raman scattering (SERS) is an effective characterization method which has shown broad applications in the field of detection and identification. In this work, we describe the facile fabrication of SERS ultrathin films (UTFs) based on a two-dimentional architecture via layer-by-layer assembly of hygroscopic sodium polyacrylate (PAAS) modified Au nanoparticles (NPs) and MgAl layered double hydroxide (LDH) nanosheets. The resulting Au@PAAS/LDH UTFs possess a periodic long-range ordered layered structure and dense immobilization of Au NPs within the LDH interlayer microenvironment. The distance of Au NPs in the x–y plane reaches as low as ∼2.16 nm, and thus the coupling of Au–Au NPs enabled an enhanced electromagnetic field and improved SERS effect. For example, a detection limit as low as 10−9 M could be obtained for Rhodamine 6G. Moreover, the obtained UTFs could be adapted to various solvents and dye molecules, confirming the versatility and the sensitivity of the 2D UTFs. In addition, the UTF exhibits satisfactory reusability and high stability at high temperature and various pH values. Therefore, this work highlights a high-efficiency SERS film material with facile preparation, which guarantees their further application in environmental detection and analysis.
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CATALYSIS LETTERS
·
2016
·Vol. 147
·期 2
·383-390
·
IF 2.294
Liu Xianxiang,Yang Yongjun,Su Shengpei,Yin Dulin
Abstract Gold nanoparticles (NPs) with mean diameters of around 2 nm were successfully deposited onto the inorganic support hydroxyapatite to give the Au/HAP catalyst. The Au/HAP catalyst showed appreciably high catalytic activity for the aerobic oxidation of glucose to produce sodium gluconate at room temperature. Glucose conversions of 100% and sodium gluconate yield of 90.9% were achieved after 1 h at room temperature by the use of 0.5 equiv. Na 2 CO 3 . The developed catalytic system was easily-handed for the production of sodium gluconate. In addition, the Au/HAP catalyst was stable and could be reused for several times without the loss of its catalytic activity. Graphical Abstract Au/HAP catalyst showed high activity and stability on the aerobic oxidation of glucose.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shan Huang,Zhichun Si,Xuankun Li,Jinshuo Zou,Youwei Yao,Duan Weng
Au nanoparticles and reduced graphene oxide (r-GO) co-modified TiO 2 nanotube arrays (TNTs) were prepared by a facile and green strategy based on the electro-deposition technology for detecting H 2 O 2 , O 2 and nitrite. As-prepared Au/r-GO/TNTs electrode was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results clearly demonstrate that the successful attachment of r-GO sheets and narrow-range distribution of Au nanoparticles on TNTs . The reduced grapheme oxide sheet can help to improve the electronic conductive performance of TNTs and prevent the agglomeration of Au nanoparticles. Electrochemical studies reveal that the Au/r-GO/TNTs electrode exhibit excellent electrocatalytic performance toward the reduction of H 2 O 2 . Under the optimal experimental condition, the sensor has a quick response to H 2 O 2 at −0.3 V with a high sensitivity (1011.35 mA M −1 cm −2 ), wide linear range (0.01–22.3 mM) and low detection limit (0.006 μM). In addition, the sensor also has good stability and excellent selectivity. Moreover, the established Au/r-GO/TNTs electrode also shows high sensitivities towards dissolved O 2 and nitrite ions, which has great potential for the development of electrochemical sensors, molecular bioelectronics devices and biosensors.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Jiale Liu,Zhennan Wu,Ye Tian,Yanchun Li,Lin Ai,Tingting Li,Haoyang Zou,Yi Liu,Xindong Zhang,Hao Zhang,Bai Yang
Aggregation-induced emission (AIE) and self-assembly induced emission (SAIE) effects have been employed to tune the emission properties of metal nanoclusters (NCs). However, it is still not possible to further enhance the photoluminescence quantum yields (PLQYs) and control the emission colors of the NCs using AIE and SAIE. On the basis of our recent work studying the contribution of Cu(I) defects in the SAIE of Cu NCs, in this article, Au(I) was doped into Cu NC self-assembled nanosheets (NSASs) to construct a more stable Au(I)-centered state. As a result, the PLQYs, emission stability, and tunability of emission colors of the Cu NSASs were significantly improved. Detailed studies reveal that the doped Au(I) induces a Au(I)–Cu(I) metallophilic interaction, which leads to a ligand-to-Cu–Au charge transfer, which facilitates the relaxation of excited electrons via a radiative pathway, thereby enhancing the emission intensity. The charge transfer from Cu to Au lowers the energy, thus leading to the red-shift of PL emission. Au(I) is likely doped into the Cu NSASs rather than in individual NCs, because 0.3% Au doping is enough to alter the emission properties. By mixing Au(I)-doped Cu NSASs with different emission colors (due to different Au doping percentages) as color conversion materials on commercially available 365 nm GaN chips, a white light-emitting diode prototype is fabricated.
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RSC Advances
·
2016
·Vol. 6
·期 31
·26374-26379
·
IF 3.289
Chao Sun,Mengya Liu,Yu Zou,Jiandong Wei,Jiang Jiang
Plasmonic Au–copper sulfides hybrid nanocrystals are of great interest for both fundamental research and application in optoelectronics, catalysis, and biomedicine, in which a precise and high-yield synthesis of the hybrid nanocrystals is required. Herein, we investigated colloidal synthesis of Au–CuS hybrid nanocrystals based on a seed-mediated method. Different from previously reported deposition of Cu-rich Cu chalcogenides, we found that decreasing the Cu–S reaction rate is critical for the deposition of relatively S-rich CuS on Au seeds in high yield, which can be achieved by using a chlorobenzene solution containing a small amount of oleylamine as the solvent. The influence of the S/Cu feed molar ratio and reaction temperature on the formation of Au–CuS hybrid nanocrystals has also been investigated. The obtained Au–CuS hybrids showed better photothermal transduction efficiency over CuS nanocrystals prepared under identical conditions. In addition, Au–CuS hybrids could be used as templates to synthesize Au–CuInS2 and Au–Cu2ZnSnS4 hybrid nanocrystals via subsequent reactions with In or Zn/Sn precursors at high temperature. These results provide insight into the critical parameters governing the growth of Au–copper sulfides hybrid nanostructures, which can be useful for the design of other noble metal–semiconductor hybrid nanostructures.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 3
·3067-3074
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IF 1.798
Li Jiali,Yan Luting,Wang Huili,Wang Haiwei,Chen Xiao,Wang Lei,Wu Meng
Gold nanoparticles (NPs) were deposited directly on an indium tin oxide (ITO) substrate using the successive ionic layer adsorption and reaction (SILAR) method by chemically reducing precursor metal salts with dopamine aqueous solution. The Au NPs decorated on the ITO substrate were approximately spherical, with an average particle size of about 40 nm, which varied in accordance with different SILAR cycles, reactant concentrations, and intermediate media. Strong surface plasma resonance characteristics were confirmed by the surface-enhanced Raman scattering and absorption spectra of the Au NPs. Through this simple method, glucose sensors based on this kind of Au NPs/ITO exhibited a sensitivity of 524 μA mM −1 cm −2 , which is higher than any other similar study.
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RSC Advances
·
2016
·Vol. 6
·期 94
·91209-91215
·
IF 3.289
Na Li,Zhenghua Tang,Likai Wang,Qiannan Wang,Wei Yan,Hongyu Yang,Shaowei Chen,Changhong Wang
Multi-wall carbon nanotubes (CNTs)/Au nanocomposites have been prepared by the in situ reduction approach. The as-prepared hybrid materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The composition of the nanocomposites was fine tuned by varying the mass ratio of Au-to-CNTs. Among a series of samples tested, hybrid materials with a Au/carbon nanotubes (Au/CNTs) ratio = 1 : 2 demonstrated the best activity towards oxygen reduction reaction (ORR), as most positive onset potential, largest kinetic current density, highest amount of electron transfer and lowest H2O2 yields were obtained. Notably, the Au/CNTs also exhibited remarkable long-term durability higher than commercial Pt/C.
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Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 8
·1594-1600
·
IF 4.543
Guofen Song,Han Zhou,Jiajun Gu,Qinglei Liu,Wang Zhang,Huilan Su,Yishi Su,Qinghua Yao,Di Zhang
Tumor markers are usually over-expressed in human body fluids during the development of cancers. Monitoring tumor markers' level is thus important for early diagnosis and screening of cancers. One way to achieve this is based on the surface enhanced Raman scattering (SERS) technique that can drastically amplify Raman signals of analytes on a plasmonic metal (e.g., Au, Ag, and Cu) surface. However, this promising method suffers from aggregation of plasmonic nanoparticles. Here we report a stable, reproducible, and facile SERS-based readout method to detect an important tumor marker, carcinoembryonic antigen (CEA). This route utilizes Au butterfly wings with natural three dimensional (3D) hierarchical sub-micrometer structures rather than relying on the aggregates of metal nanoparticles. The Au butterfly wings show excellent SERS property and are temperature (80 °C) and time (6 months) stable on a sub-micrometer scale. Thus, the detecting antibodies and enzyme-linked secondary antibodies that are usually applied in conventional enzyme-linked immunosorbent assay (ELISA) can be replaced by chemically synthesized CEA aptamers, significantly simplifying the whole detection process. We demonstrate the feasibility of this method via quantitative detection of clinical CEA level in human body fluids. This work thus demonstrates a promising tumor marker detection technique based on a hierarchical sub-micrometer SERS structure, which could be useful for the mass screening of early stage cancers.
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Analytical Methods
·
2017
·Vol. 9
·期 8
·1265-1272
·
IF 1.9
Caihong Li,Jian Li,Haowei Tang,Xiaodi Yang,Qiqi Fei,Chong Sun
In this study, a simple non-enzymatic hemoglobin (Hb) biosensor based on SiO2–Au nanoparticles (SiO2–Au NPs) was prepared and investigated. The structure and morphology of the SiO2–Au NPs were characterized by transmission electron microscopy (TEM) and UV-vis spectroscopy. Fourier transform infrared spectra (FTIR) and circular dichroism (CD) spectra were obtained to test the biocompatibility of the SiO2–Au NPs. The electrochemical properties were determined via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Under the optimized conditions, the linear regression equation between the peak currents and the concentration of Hb was i (μA) = −51.57269 + 83.14106c (mg mL−1) (R2 = 0.9979) with a detection limit of 204.46 ng mL−1. In addition, the electrochemical biosensor possessed good anti-interference performance. Due to the superior performance of SiO2–Au NPs, this method shows great potential applications for the direct sensing of Hb for the purpose of evaluating meat quality.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 26
·38298-38309
·
IF 0
Yang Yihuai,Hu Xianzhi,Zi Futing,Chen Shuliang,Zhao Li,Li Xinrong,Lin Yue
Thiosulfate gold leaching is one of the most promising green cyanide-free gold extraction processes; however, the difficulty of recovering Au(I) from the leaching system hinders its further development. This study prepared aminoguanidine-functionalized microspheres (AGMs) via a one-step reaction involving nucleophilic substitution between aminoguanidine hydrochloride and chloromethylated polystyrene microspheres and used AGMs to adsorb Au(I) from thiosulfate solutions. Scanning electron microscopy, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were used to analyze the structure and properties of AGMs. Experiments were designed to investigate the effects of pH, temperature, initial Au(I), and thiosulfate concentrations on the gold adsorption performance of AGMs. Results demonstrated that AGMs can efficiently adsorb Au(I) from thiosulfate solutions in a wide pH range. The adsorption process conforms to the pseudo-second-order kinetic model and Langmuir isotherm model, with a maximum capacity of 22.03 kg/t. Acidic thiourea is an effective desorbent, and after four adsorption–desorption cycles, the adsorption rate of Au(I) by AGMs is 78.63%, which shows AGMs have good cyclic application potential. Based on the results of characterization, experiments, and density functional theory calculations, the mechanism for the adsorption of [Au(S 2 O 3 ) 2 ] 3− on AGMs involves anion exchange. Importantly, AGMs exhibited satisfactory adsorption property for Au(I) in practical Cu 2+ –NH 3 (en)–S 2 O 3 2− systems. This study provided experimental reference for the recovery of Au(I) from thiosulfate solution. Graphical Abstract
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Journal of Physical Chemistry C
·
2024
·
IF 3.3
Cuixia Bi,Xiaolong Yin,Zhixiu Wang,Hongyan Zhao,Guangqiang Liu
In this study, trimetallic Au@PdPt nanoparticles (NPs) were synthesized by a seed-mediated technique, possessing a hexoctahedral (HOH) Au core with a branched PdPt alloy shell. The fabrication process involved the synthesis of HOH Au NPs exhibiting high-index {651} facet as nanotemplates, followed by the epitaxial growth of Pd and Pt on these NPs to yield HOH Au@PdPt NPs. The size and composition of HOH Au@PdPt NPs as well as the thickness of PdPt alloy shells (from 2 to 4, 5, and 8 nm) can be precisely adjusted by varying the quantity of Pd and Pt precursors. The catalytic efficacy of these Au@PdPt NPs was significantly enhanced through the synergistic effect between Au, Pd, and Pt, along with the increased contact areas afforded by multibranched PdPt alloy shells. For methanol electro-oxidation, the catalytic activity of HOH Au@PdPt NPs depends on the Pt content showing a distinctive volcano-type pattern. Remarkably, the HOH Au@Pd0.3Pt0.3 NPs demonstrate optimum catalytic performance for methanol oxidation in acidic conditions, exhibiting superior electrocatalytic properties compared to commercial Pt black catalysts. Their ECSA value, mass, and specific activities are 47.21 m2 g–1, 0.93 A mg–1, and 1.97 mA cm–2, respectively. This research can be exploited to fabricate catalysts possessing exceptional properties by precisely designing and controlling the size, composition and morphology of the trimetallic Au@PdPt NPs.
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Journal of Materials Chemistry B
·
2024
·
IF 6.1
Qijun Du,Ho-Yin Yuen,Jingke Pan,Chenwei Sun,Di Wu,Jie Liu,Guohua Wu,Xin Zhao,Shuqi Wang
The hypoxic microenvironment of solid tumors can lead to reduced therapeutic DNA damage to the tumor cells, thus diminishing tumor sensitivity to radiotherapy. Although hypoxic radiosensitizers can improve radiotherapy efficacy by enhancing the role of oxygen, their effects are limited by the uneven distribution of oxygen within solid tumor tissues. In this study, a novel radiosensitizer via leveraging gold complexes and metronidazole (MN) was synthesized to improve radiotherapeutic efficacy. The gold atoms incorporated in the radiosensitizer enabled efficient deposition of high-energy radiation; the hydrophobic metronidazole was reduced to hydrophilic aminoimidazole under hypoxia conditions and further promoted radiotherapy sensitization. The results of CCK-8 assays, Live/Dead assays, γ-H2AX immunofluorescence indicated that metronidazole-modified Au@BSA nanocomposites (NCs) exhibited excellent antitumor effects. The in vivo antitumor tests further showed an inhibition rate of 100%. These results demonstrated that the NCs successfully enhanced radiotherapy efficacy by the dual sensitization strategy. Overall, we believe this multimodal radiosensitizing nanocomplex can significantly inhibit tumor growth and metastasis, with their hypoxia-oriented characteristics ensuring a higher efficacy and safety.
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