DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 16
·5624-5631
·
IF 4.39
Xiaorong Li,Yutong Shao,Shibo Lv,Jiarui Tian,Daoyuan Zheng,Jitao Song,Fengling Song
Here, Au@mSiO2 core–shell nanoparticles were easily synthesized by a one-pot method. Positively charged alkyl chains with different lengths were modified on the surface of the particles. Thus composite nanoparticles with different potentials and hydrophilic interface properties were prepared. Based on the charge properties of the shell surface, the process of loading dyes was simplified by the strong electrostatic adsorption between the particle surface and the heterogeneous negatively charged dyes. The fluorescence intensity and fluorescence lifetime of the loaded fluorescent dyes showed that the dyes could not produce effective tunneling in the mesoporous materials, which was limited to the surface of the particles, which is beneficial for the subsequent research on the loading or release of nanoparticles. After loading, the nanoparticles still exhibit a high fluorescence intensity, enabling dual-mode microscopic imaging (TEM and fluorescence).
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Pengqi Lu,Jiawei Lang,Zeping Weng,Arash Rahimi-Iman,Huizhen Wu
Owing to a complex monocline structure and high-density of defects in monocrystalline GaTe, the performance of GaTe-based electronic devices is considerably compromised. Yet, the defects’ nature in GaTe could be a merit rather than a shortcoming in other realms. In our work, the density of defects in GaTe films is utilized for a facile decoration of Au nanoparticles (NPs), which allowed us to extend its application potential to the domain of surface enhanced Raman scattering (SERS) for the first time. Two-dimensional (2D) GaTe layered structures are prepared by mechanical exfoliation, and high-density Au NPs are synthesized by immersion of 2D GaTe in HAuCl4 aqueous solution. By varying the immersion time, the sizes and coverage rate of Au NPs on GaTe can be elaborately tuned. Thanks to the defect nature of GaTe, the maximum coverage amounts to 98%. The hereby achieved Au-NPs–2D-GaTe hybrid structure demonstrates outstanding properties as a superior SERS substrate for ultrasensitive detection of R6G aromatic molecules. Remarkably, the enhancement factor reaches up to 1.6 × 104, and the minimum detectable concentration is 10–11 M, undercutting that of recently reported Au-NPs–MoS2 SERS and Au-NPs–graphene SERS substrates which have a similar structure. With superior detection capability and facile preparation, Au-NPs–GaTe SERS substrates can become a perfect choice for the detection of aromatic molecules.
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REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Yong Xiang,Xiangmeng Chen,Chunmei Cao,Shuaiwei Ding,Li Xu,Guoji Liu
Designing and synthesizing high activity adsorption materials for recycling precious metals is essential to meeting the needs of the high-tech industry. Here, a new adsorbent material RFU is prepared by grafting urea onto the phenolic resin by one-step hydrothermal synthesis method. It has been proved that RFU microspheres had extremely high absorption capacity and excellent selectivity (the adsorption capacity can reach 1600 mg/g when the initial concentration of Au(III) is 1 g/L) for Au(III). Different factors affecting the adsorption process such as pH, adsorption capacity, selectivity, contact time, and reusability were systematically investigated. FT-IR, SEM, TEM and XPS were used to characterize the adsorbent before and after adsorption. The adsorption isotherm was found to be consistent with the Langmuir isotherm model, and the kinetic was consistent with the pseudo-second-order kinetic model . Further regeneration and cyclic adsorption indicate that RFU can be recycled at least four times. Combining its characterization with kinetic and thermodynamic data, we drew the conclusion that N H and C = O of RFU played an important part during adsorption. The strong soft-soft interaction between N, O atoms and Au atoms gives the material excellent gold ion adsorption capacity and adsorption selectivity. These findings can broaden the path for the use of nitrogen-rich nanomaterials in gold ion recovery.
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LANGMUIR
·
2020
·
IF 3.557
Jiale Liu,Ye Tian,Lin Ai,Zhennan Wu,Dong Yao,Yi Liu,Bai Yang,Hao Zhang
Self-assembly is a powerful technology to construct nanomaterials with helical structures. However, using metal nanoclusters (NCs) as the building blocks for the construction of helical architectures is still rarely reported. In this paper, Au NC assembled helical ribbons (Au NCHRs) are successfully constructed by using Au NCs as the building blocks. Effects of heating mode, solvent polarity and ligand length on the self-assembly process of Au NCs are discussed. The results indicate that the lengths of overlapped and nonoverlapped ligands between adjacent Au NCs play the dominated role on adjusting the morphologies of the resulting assemblies. Ligands with appropriate overlap can provide sufficient flexibility for the helical assembly of Au NCs without losing the stability. If the length of the overlapped parts is too long, the assemblies are usually rigid without the helical structure. Instead, the overlength of nonoverlapped ligands will boost the flexibility but damage the structural stability of the assemblies. Since everything in the world is assembled by atoms and molecules, recognizing the self-assembly mechanism of NCs may promote our understanding on the bountiful complexity of life and nature.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Yongheng Xiong,Yuting Li,Shipeng Wan,Yang Yu,Shule Zhang,Qin Zhong
Electrochemical reduction of NO to NH 3 (NORR) is an attractive approach to mildly realize NO removal and valuable NH 3 production. The electrolyte, as function as the NO absorbent, is crucial to apply electrochemical technology in practical de-NO engineering. In this paper, the ferrous chelate acted as the electrolyte for effective NO absorption in NORR based on the Brown-ring reaction. The rGO and Au/rGO catalysts served as cathodes to realize ferrous regeneration for continuous NO reduction. The results revealed that ferric chelate could be fully reduced at lower onset potential on rGO electrode. The Au/rGO catalyst exhibited excellent average yield and selectivity for NH 3 at − 0.1 V and pH = 6.32, (14.6 μmol* h −1 * cm −2 and 65.2%, respectively). The Faradaic Efficiency of NH 3 could reach 98.3% at pH = 1.0. This work provides a valuable reference for effective NO adsorption and sustainable NO-to-NH 3 conversion.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 2
·022511
·
IF 3.721
Lei Jin,Jia-Qiang Yang,Fang-Zu Yang,De-Yin Wu,Zhong-Qun Tian
Alkaloid hypoxanthine is a novel complexant for green cyanide-free Au(III) electrodeposition. In this work, the electrochemical and coordination behaviors of hypoxanthine-Au(III) ion in the green cyanide-free bath are studied. The electrochemical behavior confirms that hypoxanthine-Au(III) ion is in the irreversible two-step electro-reductions with the first controlled by diffusion and the second by diffusion and electrochemistry. The stability constant of hypoxanthine-Au(III) ion is 4.8 × 1030. DFT calculations further indicate that the optimal coordination structure is N3-Au-N7 with the N-Au average bond energy of 11.03 eV. The bath component of potassium citrate plays almost no influence, whereas the additive of sulfocompounds shows a significant effect on the electro-reduction of hypoxanthine-Au(III) ion. Based on the cyanide-free Au(III) electrodeposition bath, the obtained gold coating is fine and compact in grains without organic inclusion and in the resistivity of 2.84 × 10−8 Ω·m.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2016
·
IF 3.782
Xuefei Zhou,Xiaohong He,Shiliang Wei,Kun Jia,Xiaobo Liu
A novel cyano-terminated zinc phthalocyanine (ZnPc-CN) exhibiting visible near infrared (vis-NIR) emitting around 690 nm in N,N -dimethylformamide (DMF) solvent has been synthesized. Furthermore, the peripheral cyano groups of newly synthesized zinc phthalocyanine were hydrolyzed in strong basic solution, leading to water soluble carboxylated zinc phthalocyanine (ZnPc-COOH) with completely quenched fluorescence in aqueous solution. Interestingly, we found that the NIR fluorescence of aqueous ZnPc-COOH was dramatically recovered in the presence of gold nanorods (Au NR), which was due to the alternation of ZnPc-COOH molecules self-assembling via electrostatic interaction between cetyltrimethylammonium bromide (CTAB) on the surface of Au NR and peripheral carboxyl of ZnPc-COOH. In addition, ZnPc-COOH/Au NR conjugates demonstrated an improved singlet oxygen generation, which could be served as potential bioimaging probe and photosensitizer for photodynamic therapy.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2015
·
IF 2.752
Xi-Zhi Zhang,Yang Zhou,Wei Zhang,Yu Zhang,Ning Gu
Prussian blue (PB) and gold modified polystyrene (PS) nanocomposites (PS@Au@PB) were synthesized and characterized by TEM, SEM, FTIR, UV–vis and EDS. The formation mechanism of PB induced by gold nanoparticles on PS nanospheres was proposed. The peroxidase-like and catalase-like activities of the synthesized nanocomposites were investigated. Peroxidase-like activity was found to follow Michaelis–Menten kinetics. The calculated kinetic parameters indicated that the PS@Au@PB nanocomposites possess strong affinity with the substrates and high catalytic activity. A sensitive method for glucose detection was developed using glucose oxidase (GO x ) and PS@Au@PB nanocomposites. The detection limit for glucose was determined to be as low as 3.9 μM and the linear range was from 15.6 to 250.0 μM. It suggests that PS@Au@PB nanocomposites can serve as a useful reagent in some biological detections.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zengbo Ke,Lejing Li,Qiurong Jia,Yangong Yang,Hongwei Cui
Au/Ir bimetals are not easy to obtain because alloy phase diagrams are not available for these material combinations (Ronald et al., 2004). Herein, the Au/Ir nanochains (Au/Ir NCs) are synthesized via one-pot, hydrothermal method . By virtue of jagged surface with abundant atomic defects, the Au/Ir NCs are demonstrated much more active than commercial IrO 2 electrocatalysts for oxygen evolution reaction under alkaline media. The potential of the Au/Ir NCs sustains 1.53 V vs reversible hydrogen electrode (RHE) with no obvious decease under current density at 10 milliamps per square centimeter, while that of IrO 2 increase to 1.65 V vs RHE after stability tests for ca. 32 h. The durability as well as the activity of Au/Ir NCs is attributed to the electronic interaction between Au and Ir, which is confirmed by X-ray photoelectron spectroscopy (XPS).
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CHINESE JOURNAL OF CATALYSIS
·
2020
·
IF 6.146
Fan Wu,Lei He,Wen-Cui Li,Rao Lu,Yang Wang,An-Hui Lu
Supported-Au catalysts show excellent activity in CO oxidation , where the nature of the support has a significant impact on catalytic activity. In this work, a hexagonal boron nitride (BN) support with a high surface area and adequately exposed edges was obtained by the ball-milling technique. Thereafter, impregnation of the BN support with Cu(NO 3 ) 2 followed by calcination under air at 400 °C yielded a CuO-modified support. After Au loading, the obtained Au-CuO x /BN catalyst exhibited high CO oxidation activity at low temperatures with a 50% CO conversion temperature ( T 50% ) of 25 °C and a complete CO conversion temperature ( T 100% ) of 80 °C, well within the operational temperature range of proton exchange membrane fuel cells. However, the CO oxidation activity of Au/BN, prepared without CuO x for comparison, was found to be relatively low. Our study reveals that BN alone disperses both Cu and Au nanoparticles well. However, Au nanoparticles on the surface of BN in the absence of CuO species tend to aggregate upon CO oxidation reactions. Conversely, Au nanoparticles supported on the surface of CuO-modified BN remain small with an average size of ∼2.0 nm before and after CO oxidation. Moreover, electron transfer between Au and Cu species possibly favors the stabilization of highly dispersed Au nanoparticles on the BN surface and also enhances CO adsorption. Thus, our results demonstrate that thermally stable and conductive CuO-modified BN is an excellent support for the preparation of highly dispersed and stable Au catalysts.
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TALANTA
·
2016
·
IF 4.035
Zhuang Li,Zhenzhen An,Yongyang Guo,Kangning Zhang,Xiaoling Chen,Dongxia Zhang,Zhonghua Xue,Xibin Zhou,Xiaoquan Lu
In this work, we report a novel Au-Pt bimetallic nanoparticles (Au-PtNPs) decorated on the surface of nitrogen-doped graphene (NG) functionalized with 1, 3, 6, 8-pyrene tetra sulfonic acid sodium salt (PyTS) by direct electrodeposition method. The results of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and electrochemical impendence spectrum (EIS) reveal that the Au-PtNPs were successfully anchored on the surface of NG sheets with a diameter of 20–40 nm. Further, the prepared Au-PtNPs/PyTS-NG nanocomposite exhibits superior catalytic activity for the oxidation of nitrite. Under optimal experimental conditions, an amperometric sensor with a linear range of 0.5–1621 μM and a detection limit of 0.19 μM (S/N=3) for the detection of nitrite was set up and applied to real samples.
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Materials Science & Engineering C-Materials for Biological Applications
·
2014
·
IF 2.736
Fugui Xu,Fan Wang,Duanguang Yang,Yong Gao,Huaming Li
In this study, Au nanoparticles decorated graphene nanosheets were prepared using poly(vinylpyrrolidone) (PVP) covalently functionalized graphene oxide and chloroauric acid as template and Au precursor, respectively. Both the density and the size of Au nanoparticles deposited on the surface of graphene could be adjusted by the PVP grafting density. The graphene–Au hybrid nanosheets were then applied to fabricate a highly sensitive l -cysteine (L-CySH) electrochemical sensing platform. The cyclic voltammetry results showed that the modified glassy carbon electrode with graphene–Au hybrid nanosheets exhibited strong catalytic activity toward the electrooxidation of L-CySH. The current exhibited a widely linear response ranging from 0.1 to 24 μM with a low detection limit under the optimized conditions. The detection limit of L-CySH could reach as low as 20.5 nM (S/N = 3). The enhanced electrochemical performance of the fabricated sensor was attributed to the combination of the excellent conductivity of graphene and strong catalytic property of uniform Au nanoparticles.
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危险品化学品经营许可证（带存储）