CRYSTENGCOMM
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2019
·Vol. 21
·期 46
·7108-7113
·
IF 3.382
Lingling Li,Yu Liu,Qishun Wang,Xuan Zhou,Jian Li,Shuyan Song,Hongjie Zhang
A CeO2-supported Au nanohybrid is regarded as a promising catalytic system for CO oxidation, but its unsatisfactory catalytic activity and high cost are still challenges for sustainable application. In this work, we have synthesized a series of low loading and high activity Au/CeO2 supported catalysts using a coprecipitation method. Au/CeO2 catalysts with a low Au content (0.2 wt%) showed extremely high activity for CO oxidation with 100% conversion of CO around 60 °C. The key to the success is that the unique oxygen-deficient structure of cerium oxide can capture gold to provide a strong synergistic effect between the metal and the support. The content of gold in their oxidation states (Au+1, Au+3) present in the catalyst is one of the important factors affecting the catalytic activity. Furthermore, all of the prepared catalysts present a high BET surface area of roughly 140 m2 g−1. This high specific surface area provides adequate adsorption sites for CO. Moreover, the low loading of Au is critical to reducing the cost of noble metal-based catalysts and making them practical for industrial applications.
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International Journal of Analytical Chemistry
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2019
·
IF 1.682
Xiaotian Zhu,Chang Liu,Jie Liu
A new colorimetric assay for the detection of sulfide anions with high sensitivity and selectivity is reported, utilizing Au-Hg alloy nanorods (Au-HgNRs) as probe. Au-HgNRs were prepared by modifying gold nanorods (AuNRs) with reducing agent and mercury ions. In an aqueous solution with sulfide anions, the formation of mercuric sulfide due to redox reaction between the amalgams and sulfide anions greatly changed the surface chemistry and morphology of the Au-HgNRs, leading to a red shift of the localized surface plasmon resonance (LSPR) absorption peak, accompanied by a change in colorimetric response. A good linear relationship was obtained between the LSPR peak wavelength shift and concentration of sulfide anion in the range of 1 × 10−5−1 × 10−4 mol/L. The selectivity of this method has been investigated by other anions. The colorimetric sensing system successfully detected sulfide in wastewater from leather industry.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Tianran Lin,Minqing Zhang,Fuhai Xu,Xingyu Wang,Zhifei Xu,Liangqia Guo
A fast, sensitive and high-resolution colorimetric method for sensing benzoyl peroxide (BPO) was proposed by using orange sheath-like [email protected] nanorods (NRs) as the signal transducer. BPO can oxidize Ag nanoshells on the surface of [email protected] NRs; the etching of Ag nanoshells changes the aspect ratio of Au nanostructures and causes a red-shift of longitudinal local surface Plasmon resonance (LSPR) peak, resulting in a sharp-contrast multicolor change within 2 min. Under the optimal conditions, the red-shift of longitudinal LSPR peak was in linear with the BPO concentration over the range of 0–100 μmol L −1 with a limit of detection of 0.75 μmol L −1 . Furthermore, a simple, inexpensive and portable test kit was designed for the visual detection of BPO. A color variation can be distinguished by naked eyes at a concentration of BPO as low as 20 mg kg −1 in flour samples. The colorimetric sensor shows a great potential application for the rapid and on-site assay of BPO in flour samples.
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TALANTA
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2020
·
IF 5.339
Anxin Jiao,Linlin Xu,Yue Tian,Qingqiang Cui,Xiangdong Liu,Ming Chen
Based on the intermediate states of metal ions in metal oxide nanomaterials (NMs) that acted as the primary active species, the design of high-performance nanozymes has greatly stimulated current research in diverse biomedical applications. Herein, Cu 2 O nanocubes-grafted highly dense Au nanoparticles (NPs) was developed as an appealing nanozyme for H 2 O 2 colorimetric sensor and antioxidant detections. The obtained Au/Cu 2 O heterostructures show efficient electron-transfer from metallic NPs to Cu 2 O nanocubes owing to the difference of Fermi energy between two components. The modulated electronic structure of Au/Cu 2 O hybrids enables them to possess enhanced peroxidase catalytic activity for the oxidation of 3, 3′, 5, 5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 , which is about 32% higher than that of pristine Cu 2 O nanocubes. Then, an excellent H 2 O 2 colorimetric sensor was established by using Au/Cu 2 O heterostructures with a low limit of detection (LOD) of 0.054 μM, which is much lower than the H 2 O 2 allowance level of US FDA regulations (ca.15 μM, 0.05 wt%). The obtained Au/Cu 2 O nanoproducts exhibit pronounced long-time stability with 95% peroxidase activity maintained after keeping them for 30 days, while residual 64.5% via Cu 2 O nanocubes. Furthermore, we assessed the anti-oxidative behavior of three natural antioxidants (tannic acid, gallic acid , tartaric acid) with the LODs as low as 0.039, 0.16 and 1.55 μM, respectively, and the antioxidant capacity in the following order: tannic acid > gallic acid > tartaric acid . Therefore, it is believed that the as-prepared Au/Cu 2 O nanozymes have promising potential applications in fields of biomedicine and food safety.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Guangliang Niu,Fangyan Liu,Yun Yang,Yunzhi Fu,Wei Wang
Multimetallic nanomaterials have many applications. The controlled synthesis of multimetallic nanomaterials is highly desired. We report a study on using penta-fold twinned (PFT) Au nanorods (NRs) as seeds to synthesize PFT Pd-Au-Pd segmental NRs. The results show that the different crystal structures of seeds, I − and cetyltrimethylammonium bromide (CTAB) significantly affect the deposition of Pd on seeds surface. The PFT Pd-Au-Pd segmental NRs showed excellent surface-enhanced Raman scattering (SERS) performance and improved catalytic activity. Our research is of great significance for the synthesis of similar nanostructures, and we also shown that PFT Pd-Au-Pd segmental NRs might have potential applications in studying the process of organic reaction.
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WATER RESEARCH
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2022
·
IF 13.4
Dingyuan Liang,Xiangrui Wang,Wenhong Fan
s The entering of silver nanoparticles (Ag NPs) in natural environments constantly increases due to their widespread production and application. While the environmental behavior, impacts, and fate of Ag NPs were critically assessed, the main challenge represents continuous tracking and quantification of Ag NPs in environmental and biological matrices. A group of labeled Ag NPs with gold cores (Au@Ag NPs) was developed for distinguishing between pristine Ag NPs and their other forms, and we comprehensively compared their physicochemical properties, environmental behavior, and biological effects with unlabeled Ag NPs. The electron transfer process from the Au core to the Ag shell gradually decreased with the increase of Ag shell thickness, then the inhibition of Ag + release induced by the Au core was gradually alleviated, but the generation of superoxide radicals was intensified sharply. Then, the effect of the Au core on the dissolution capacity and free radicals’ generation significantly altered the biological toxicity of Ag NPs, and the influence degree was related to the test organism's species. Nevertheless, the Au core retained the surface properties of Ag NPs, leading to the uptake of Au@Ag NPs, entirely consistent with the behavior of unlabeled Ag NPs. These findings confirmed that Au core labeling provides new opportunities for tracking Ag NPs in environmental and biological systems, and the exposure conditions and test organisms should be carefully assessed before employing the Au core labeling technology.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Linlin Xu,Qingqiang Cui,Yue Tian,Anxin Jiao,Mengya Zhang,Shuang Li,Hengshuai Li,Ming Chen
Silver/silver halides (Ag/AgX, X = Cl, Br, I)-based photocatalysts with tunable energetic synergies have attracted intensive attention in solar-energy-conversion. Herein, we introduce an appealing ternary Au/Ag/AgCl nanochain with short curvilinear necklace-like nanoarchitectures via an ingenious one-step strategy by pulsed laser irradiation of metallic ions in solution. Compared with binary Ag/AgCl nanoparticles (NPs), the ternary nanochains with stronger intermetallic synergy exhibit improved absorbance capacity and enhanced localized surface plasmon resonance (LSPR) under broad visible-light irradiation. Then, the Au/Ag/AgCl nanochains can obviously accelerate photoinduced electron transfer and boost the separation of electron-hole on their surfaces, providing an excellent photocatalytic activity towards degradation of methylene blue (MB). Meanwhile, the enhanced synergistic coupling effect of the ternary nanocomposites also enables them to inhibit the photocorrosion under visible-light irradiation. Interestingly, compared to monodisperse NPs, the Au/Ag/AgCl nanochains with numerous interconnected NPs can be self-deposited on the bottom of solution after each photocatalytic reaction. Without the aid of extra and complicated nanocatalyst-separation procedures, then the clear-water will be easily obtained. Therefore, the unique photocatalyst possesses pronounced long-term stability, since ~ 97.6% photodegradation rate can be maintained after 14 recycling tests within two weeks. Undoubtedly, these findings will bring new opportunities to prepare high-performance photocatalysts for diverse practical applications.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Da Wang,Lin Huang,Zhongnan Guo,Xue Han,Chunjun Liu,Wenjun Wang,Wenxia Yuan
High separation of photo-excited electrons and holes, leading to fast reaction rate on semiconductor surface, are determined for the hydrogen evolution by water reduction. We here provide the efficient photocatalyst of Au/SiC composite for hydrogen production, where the effect of localized surface plasmon resonance effect (LSPR) is firstly induced in the SiC-based materials for water splitting. The hydrogen production for Au/SiC is robustly increased by 30 times compared to that of pristine SiC. This high performance is attributed to the LSPR by Au nanoparticles , which results in the efficient charges separation across the Au SiC interface and accelerated water reduction rate on SiC surface by the hot electrons in conduction band of SiC. We show that the Au/SiC is an effective photocatalyst, which is capable of splitting water for hydrogen.
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JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Lin Lin,Zhipeng Yu,Zhezhe Wang,Zhuohong Feng,Feng Huang,Lili Huang,Qionghua Dai,Fengfen Zhang,Zhiqiang Zheng
Au@SiO 2 /NaYF 4 :Tb 3+ ,Yb 3+ @NaYF 4 nanocomposites are acquired by combining Au@SiO 2 nanorods with ligand-free NaYF 4 :Tb 3+ ,Yb 3+ @NaYF 4 nano-particles in water solution due to the electrostatic attraction. Plasmon-enhanced upconversion (UC) and quantum-cutting (QC) are both obtained and optimized in these nanocomposites by adjusting SiO 2 shell thickness and concentrations of Au@SiO 2 . While the thickness of SiO 2 shell is 35 nm, the enhancement factor of UC and QC reaches maximum as 1.91 and 3.47 times, respectively. The nanocomposites may be applied in biological fluorescence label, super-resolution imaging and solar cells, etc.
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JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Qunling Fang,Jianfeng Zhang,Linfeng Bai,Jinyu Duan,Huajian Xu,Ken Cham-Fai Leung,Shouhu Xuan
This work reports a facile one-step method for the fabricating Fe 3 O 4 @Au/polydopamine sandwich-like core-shell nanostructure , in which the Au/polydopamine (Au/PDA) hybrid shell is obtained via an in situ redox-oxidation polymerization between the HAuCl 4 and dopamine. The content of Au nanocrystals, shell thickness, and particle sizes are tunable by varying the experimental parameters. Intriguingly, this general method can be applied for different functional nanostructures such as the β-FeOOH@Au/PDA, SiO 2 @Au/PDA, and CNT@Au/PDA nanocomposites. A possible formation mechanism is proposed and it is found that the surface interaction plays a key role in determining the final nanostructure. The as-prepared Fe 3 O 4 @Au/PDA exhibited eminent catalytic activity on the reduction of 4-nitrophenol. Since the external PDA shell prevents the Au nanocrystals from leaching during the reduction, the cycling activity has been maintained as high as 95% after seven times of catalytic reaction.
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TALANTA
·
2011
·
IF 3.722
Jingming Gong,Xingju Miao,Ting Zhou,Lizhi Zhang
A sensitive enzymeless organophosphate pesticides (OPs) sensor is fabricated by using Au nanoparticles (AuNPs) decorated graphene nanosheets (GNs) modified glassy carbon electrode as solid phase extraction (SPE). Such a nanostructured composite film, combining the advantages of AuNPs with two dimensional GNs, dramatically facilitates the enrichment of nitroaromatic OPs onto the surface and realizes their stripping voltammetric detection of OPs by using methyl parathion (MP) as a model. The stripping voltammetric performances of captured MP were evaluated by cyclic voltammetric and square-wave voltammetric analysis. The combination of the nanoassembly of AuNPs-GNs, SPE, and stripping voltammetry provides a fast, simple, and sensitive electrochemical method for detecting nitroaromatic OPs. The stripping analysis is highly linear over the MP concentration ranges of 0.001–0.1and 0.2–1.0 μg mL −1 with a detection limit of 0.6 ng mL −1 . This designed enzymeless sensor exhibits good reproducibility and acceptable stability.
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ANALYST
·
2012
·Vol. 138
·期 4
·1219-1225
·
IF 4.23
Xindong Wang,Jing Dong,Huami Ming,Shiyun Ai
A novel strategy was proposed for preparing a highly sensitive glycoprotein sensor based on molecularly imprinted polymers (MIP), which was electropolymerized with o-phenylenediamine and 3-aminophenylboronic acid monohydrate in the presence of template molecules (bovine serum albumin (BSA)). Sensitivity improved dramatically owing to the application of a graphene–Au nanoparticles hybrid as the electrode modifier, and the immobilization of a large amount of 6-ferrocenylhexanethiol, as the electroactive species, onto nanoparticles. The quantification of BSA was realized by detecting the electrochemical oxidation signal of 6-ferrocenylhexanethiol, which was bonded onto the electrode. Under optimized conditions, a good relationship was obtained between the response current and logarithm of BSA concentration in the range of 1.0 × 10−11 to 1.0 × 10−5 g mL−1 with a detection limit of 7.5 × 10−12 g mL−1 (S/N = 3). The resulting MIP sensor displayed good selectivity, reproducibility and stability.
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