Materials Chemistry Frontiers
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2023
·Vol. 7
·期 6
·1100-1109
·
IF 7
Suyang Li,Junjie Chen,Wanbing Xu,Biao Sun,Jiechen Wu,Qiang Chen,Pei Liang
Bimetallic gold core–silver shell (Au@Ag) surface-enhanced Raman scattering tags draw broad interest in the fields of biological and environmental analyses. Herein, an efficient hybrid microfluidic chip was designed to prepare uniform Au@Ag core–shell nanoparticles, and DTNB was used as the internal standard tag molecule to prepare Au@DTNB@Ag for SERS detection. Homogeneous core–shell nanoparticles with a particle size of 90 nm were prepared by mixing a silver precursor and a gold core in a microfluidic chip. The relative standard deviation (RSD) of the particle size distribution was close to 10%, and the detection limit of 4-MBA was as low as 10-10 M. In order to solve the influence of SERS signal fluctuation, a uniform Au@DTNB@Ag core–molecule–shell structure was synthesized in a microfluidic chip, and the characteristic peak of the analyte was corrected by the relative intensity of the DTNB characteristic peak (1335 cm−1). The experimental results showed that the SERS detection was achieved with high reproducibility, and the SERS peak intensity had a good linear correlation with the concentration. The homogeneous SERS substrate prepared using a microfluidic chip has potential for sensitive and reliable detection of environmental chemical contaminants.
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Materials Today Chemistry
·
2023
·
IF 7.3
T. Yuwen,H. Zou,S. Xu,C. Wu,Q. Peng,D. Shu,X. Yang,Y. Wang,C. Yu,J. Fan,Y. Zhang,G. Zang
Natural materials' structural variation boosts their performance. Therefore, the precise manipulation of the structure and properties of nanomaterials by self-assembly is a topic of great interest. Here, a self-assembly of glucuronic acid (GlcA)-coated Au nanoflowers (NFs) on flexible carbon cloth (SA-AuNFs@GlcA/CC) for non-enzyme electrochemical glucose detection was fabricated through the sequential deposition of gold and GlcA. The SA-AuNFs@GlcA/CC exhibits more highly exposed nanoedges than the normal AuNFs/CC without GlcA surface deposition, which may change the stereotyped traditional negative hypotheses of GlcA in glucose electrocatalysis. Notably, the unique {110} facets of Au atop the amino group grafted-CC were found in the SA-AuNFs@GlcA/CC, significantly improving the sensor's catalytic performance. The highly exposed nanoedges and unique {110} facets of SA-AuNFs@GlcA were systematically evaluated by scanning electron microscopy, transmission electron microscopy, and other electrochemical characterization tools. The SA-AuNFs@GlcA/CC exhibits excellent performance in glucose detection, including a wide linear range (5 μM-42 mM), a low limit of detection (5 μM, S/N = 3), high detection selectivity, good stability, and reproductivity. The sensor successfully detected glucose in human sweat samples and beverages in real time. Thus, this simple and green manufacturing method could be used as a novel strategy for glucose monitoring in biological and food samples.
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JOURNAL OF FOOD AND DRUG ANALYSIS
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2022
·
IF 6.157
Wenwen Chen,Qiang Chen,Wei Zhang,De Zhang,Zhi Yu,Ying Song,Xiubing Zhang,Dejiang Ni,Pei Liang
The problem of aflatoxin contamination emerged gradually in the field of food safety. Surface-enhanced Raman spectroscopy (SERS) is an ultra-sensitive and non-destructive spectroscopy technology with extensive application prospects in the detection field. In this paper, with the detection of AFB1 as the target, Au@Ag NPs substrate with uniform morphology and strong SERS effect was prepared. Furthermore, the intermediates formed by hydrogen bonding between AFB1 and melamine facilitate the binding of toxin molecules to the substrate. Moreover, the AFB1-melamine-Au@Ag NPs detection system was established by optimizing the melamine dosage, and the limit of detection can reach 10 −8 mol/L (M). In this method, AFB1 (concentration range of 10 −4 M – 10 −7 M) in tea oil, the Raman signal intensity of AFB1 shows an excellent linear, logarithmic relationship, and the correlation coefficient is 0.9685. Therefore, this work has achieved simple, sensitive, and stable AFB1 detection and has broad application potential in food safety detection.
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Nanoscale
·
2023
·Vol. 15
·期 36
·14931-14940
·
IF 6.7
Xiang Long,Yang Yang,Zhen-Long Dou,Qu-Quan Wang,Li Zhou
Heterocrystals consisting of multiple species have received wide attention owing to the advantage of the cooperative effect contributed by different functional counterparts; therefore, a controlled growth strategy is highly desired. Herein, we report an effective method to synthesize dumbbell-like Au–PtCu solid and hollow nanorods, regulated by the unique surface capping and oxidation etching roles of copper ions. Dumbbell-like nanorods are prepared through site-selective co-deposition of platinum and copper on both tips of gold nanorods assisted by the capping effect of the CTAB–Cu+ complex to passivate the side surface. On the other hand, hollow dumbbell-like Au–PtCu nanorods are formed through triggering the etching effect of copper ions by increasing the reaction temperature to 80 °C. The manipulation of the morphology and extinction properties of the trimetallic Au–PtCu nanorods is demonstrated by adjusting the concentration of copper ions. Under excitation with a near-infrared 808 nm laser, the dumbbell-like Au–PtCu nanorods show excellent photothermal conversion, with a 3.1 times temperature increment (ΔT) compared to bare Au nanorods, while the hollow dumbbell-like Au–PtCu NRs demonstrate improved photocatalytic activity under xenon lamp irradiation.
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Analytical Methods
·
2023
·Vol. 15
·期 37
·4842-4850
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IF 3.1
Zhiyou Zeng,Xiaoyu Yang,Yongguo Cao,Sanshan Pu,Xinyu Zhou,Rongli Gu,Yiqian Zhang,Caijun Wu,Xiaojun Luo,Yi He
Nowadays, the presence of highly toxic and persistent residues of pesticides in water and food around the world is becoming a serious problem, and so their rapid and sensitive detection is critical to human health. In this work, a 3D composite nanoparticle of porous PDA (polydopamine) microspheres and Au NPs (PPDA@Au NPs) was proposed as a SERS substrate to detect pesticides. Porous PDA as a substrate was first synthesized with F127 (Pluronic F127), dopamine hydrochloride, and 1,3,5-TMB (1,3,5-trimethylbenzene) under weakly alkaline conditions by a one-step method. Then, HAuCl4 was in situ reduced in the pores of PPDA spheres and grew sequentially for effecting the reducibility of PPDA. As a result, uniform 3D PPDA@Au NPs with “hot spots” were successfully synthesized as SERS substrates, which could effectively avoid the agglomeration of gold nanoparticles to greatly improve the sensitivity and uniformity of the SERS platform. At the same time, methyl parathion, 4-chlorophenol, and 2,4-D as representatives of pesticides were detected with the proposed PPDA@Au NP-based SERS platform, with detection limits lower than 7.26, 7.52, and 11 ng mL−1, separately. The current work presents a simple preparation method to prepare sensitive and uniform SERS platform PPDA@Au NPs, which have potential for applications in actual pesticide and drug testing.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 8
·1-11
·
IF 5.7
Fei Jianwen,Yang Wei,Dai Yin,Xu Wei,Fan Huizhu,Zheng Yani,Zhang Jun,Zhu Wanying,Hong Junli,Zhou Xuemin
A novel magnetic nanozyme Fe 3 O 4 @MXene-Au nanocomposite, which possessed higher peroxidase-like activity than that of Fe 3 O 4 nanoparticles and Fe 3 O 4 @MXene nanocomposites, was developed. The outstanding magnetic properties of the nanozyme endowed it with the ability of simple and rapid separation, achieving great recyclability. Based on Fe 3 O 4 @MXene-Au nanocomposites and glucose oxidase (Glu Ox), a highly selective colorimetric biosensor for glucose detection was developed. Fe 3 O 4 @MXene-Au nanocomposites can catalyze H 2 O 2 produced from glucose catalyzed by glucose oxidase to ·OH and oxidize colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxidized TMB (oxTMB) with a significant absorbance at 652 nm. The linear range of glucose was 0–1.4 mM under optimal conditions, with a limit of detection (LOD) of 0.11 mM. Glucose in human whole blood was successfully detected with satisfactory recoveries. Furthermore, a facile agarose hydrogel detection platform was designed. With smartphone software, glucose detection can be realized by the agarose hydrogel platform, demonstrating the potential in on-site and visual detection of glucose. Graphical abstract
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MICROCHEMICAL JOURNAL
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2023
·
IF 4.8
Guiyin Li,HaiMei Li,Xinhao Li,Huapeng Huang,Huimin Bian,Jintao Liang,Zhide Zhou
Low-density lipoprotein (LDL) is a key biomarker involved in cardiovascular disease (CVD) risk assessment. Early-stage diagnosis of CVD complications by monitoring LDL levels could be a significant clinical tool and the first step toward adopting efficient therapy. Herein, a novel label-free electrochemical aptasensor for LDL detection was developed via the molybdenum disulfide-gold nanoparticle- ferrocene-carboxylic acid nanosheets (MoS 2 -Au-Fc NSs) enhanced signal amplification strategy. The MoS 2 -Au-Fc NSs were used not only as the biocompatible substrate for LDL aptamer (LDLapt) stabilization due to the increasing electrical conductivity and effective surface area, but also as a redox probe for monitoring the changes of the electrochemical signal because of good electroactive properties of Fc . The aptasensor fabrication steps were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). When LDL was captured onto the sensor via the specific affinity of the LDLapt, the formed LDLapt-LDL complexes shed from the electrode and enhanced the electron transfer rate on the electrode surface, resulting in an increase of the peak current. Thus, LDL can be easily detected by measuring the changes of peak current. Under ideal circumstances, the aptasensor was linearly correlated with logarithm LDL concentration from 0.001 to 100.0 μg/mL with R 2 of 0.9914, and a low detection limit of 0.42 ng/mL. Furthermore, the LDL detected by aptasensor in actual serum samples with good actual errors (0.73%–5.00%) and satisfactory relative standard deviations (RSDs) (0.04%–0.84%). This study provides a new analytical method for measuring the level of LDL which is specifically up-regulated in CVD patients at an early stage.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Yan-ling Liu,Jian Zhu,Guo-jun Weng,Jian-jun Li,Jun-wu Zhao
Herein, we reported a robust and sensitive SERS sensing platform based on hollow porous pentagonal Au/Ag alloy nanotubes (Au/AgANTs) for simultaneous determination of three food contaminants. With the increase amount of etching agent, the morphology of the nanoparticles changed from solid to hollow porous structures , and then the disappearance of pores, accompanied by a trend of first increasing and then decreasing SERS activity. The Au/AgANTs with pentagonal cross section, hollow and pore structure provide stronger local electric field. Under optimized experimental conditions, they were utilized to achieve the simultaneous determination of rhodamine B (RhB), methylene blue (MB) and malachite green (MG) in shrimp paste with low detection limit (5.3 ×10 −11 M for RhB, 1.27 ×10 −10 M for MB and 4.07 ×10 −12 M for MG), wide linear detection range (1.0 ×10 −8 ∼1.0 ×10 −4 M for RhB, 1.0 ×10 −9 ∼1.0 ×10 −5 M for MB, and 1.0 ×10 −9 ∼1.0 ×10 −5 M for MG) and satisfactory recoveries (97.24–102.66%), suggesting that the developed method is a promising tool for accurate quantification of the three food contaminants at trace level.
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CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Xiaonan Li,Siman Luo,Yu Chen,Yucheng Zuo,Yue Huang,Hong Zhang,Liheng Chen,Jun Feng,Jing-Yi Zhu,Wei Xue
Inspired by the effective interfacial interactions between natural creatures (e.g., cockleburs and viruses) and their bio-hosts, we developed a novel gold-manganese oxide nanoparticle (Au-MnOx) nanoenzyme with a spiky surface for NIR-II light-induced synergistic antibacterial therapy. Au-MnOx with favorable photothermal performance and peroxidase-like activity could achieve combined photothermal therapy (PTT)/chemodynamic therapy (CDT) under NIR-II irradiation with a low concentration. Of special note, the spiky surface endows Au-MnOx robust bacterial adhesion, in turn favoring the following synergistic PTT/CDT through effective interaction between Au-MnOx and bacteria. In vitro results display that our combined antibacterial nanoplatforms possess the broad-spectrum antibacterial ability against both Escherichia coli (E. coli, Gram-negative) and Staphylococcus aureus (S. aureus, Gram-positive). Moreover, satisfactory in vivo bactericidal efficacy and good cytocompatibility could be obtained in the rat wound model with the mixed bacterial infections. This study puts forward a facile one-pot method to establish the well-designed Au-MnOx nanozymes with a spiky surface for NIR-II light-enhanced bacterial elimination. The meteor hammer-like Au-MnOx holds great potential in construction of a novel antibacterial treatment system to settle the overuse of antibiotics.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Ronghao Liu,Jinjie Hao,Yangyang Wang,Yuanyuan Meng,Yanzhao Yang
A hydrophobic deep eutectic solvent (HDES) based on lidocaine and thymol was examined for selective extraction and separation of Au(III), Pd(II) and Pt(IV) in the acidic leaching solution of secondary resources. At first, the properties of HDES were characterized by 1 H NMR, DSC, TGA, RDF and ESP to prove its suitability for extraction process. In addition, extraction behaviors, maximum extraction capacities and competitive extraction experiment were investigated to explore the extraction ability of HDES. The results show that the maximum extraction capacity of Au(III), Pd(II) and Pt(IV) reached 761.2 g/L, 98.3 g/L and 299.3 g/L, respectively. Meanwhile, their extraction efficiency was affected by the changing acidity of aqueous. And then, ion-association mechanism in the extraction process was proposed through the analysis of FT-IR. Finally, a separation process was proposed for the recovery of Au(III), Pd(II) and Pt(IV) based on acidity control and KSCN, which achieved recovery efficiency of 97.8 % Au(III), 99.9 % Pd(II) and 89.5 % Pt(IV). After collecting and regenerating the used HDES, their extraction performance of Au(III), Pd(II) and Pt(IV) were still maintained.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Wei Liu,Hui Sheng,Liu Zhu,Yiwen Zhang,Wenxu Liu,Yuwei Zhao,Qian Li,Yong Peng,Zhongpeng Wang
The classical strong metal-support interaction (SMSI) plays a key role in improving thermal stability for supported Au catalysts. However, it always decreases the catalytic activity because of the encapsulation of Au species by support. Herein, we demonstrate that Al 3+ is a functional additive which could effectively improve both catalytic activity and sintering resistant property for H 2 pretreated Al 3+ doped CeO 2 supported Au (AuCeAl) catalyst at high temperature. The physical characterization and in-situ DRIFTS results provide insight that more oxygen vacancies generated by Al 3+ doping could be as preferential adsorption sites for CO molecules when the encapsulation of Au species occurred, which is certificated by an accelerated formation of bicarbonate species. In the meantime, smaller Au nanoparticles with higher dispersion (2.8 nm, 85.63%) is achieved in AuCeAl catalysts, compared with that in CeO 2 supported Au (AuCe) catalysts (5.1 nm, 36.17%). Additionally, the as-prepared AuCeAl catalysts also have superior catalytic performance even after calcination at 800 °C in air.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yangyang Wang,Shuwen Chen,Ronghao Liu,Lixin Zhang,Wenfeng Xue,Yanzhao Yang
The development of efficient ionic liquids (ILs) for disposable separation and recovery of various precious metals was of great importance, but still faced difficult challenges. A phase change temperature-controlled system composed of IL and HCl solution was developed for the extraction and separation of Au(III), Pd(II) and Pt(IV) from secondary resources. UCST (upper critical solution temperature)-type IL ([1,4,7-TMTA][Tf 2 N]) possessed outstanding selectivity of precious metals and the property of temperature-controlled phase transition. The ability of ILs to form solvated hydrogen bonds was confirmed by quantum-chemical calculation to be correlated with their corresponding UCST. Different experimental parameters were optimized to explore the extraction behavior of IL. It is noteworthy that homogeneous liquid-liquid extraction system (HLLE) constructed by UCST-type IL could significantly enhance the extraction kinetic of Au(III), Pd(II) and Pt(IV) by decreasing phase interface resistance. For Au(III), Pd(II) and Pt(IV), when the system temperatures were higher than 40 °C, 49 °C and 65 °C, the maximum values were 98.5%, 98.3% and 93.2% at the highest efficiency. In addition, the extraction mechanism of anion exchange was revealed by UV–vis, IR, NMR and LC-MS spectrometry. At last, Au(III), Pd(II) and Pt(IV) could be selectively separated from multi-metal solutions where impurity ions coexist by K 2 C 2 O 4 , NH 3 ·H 2 O and CS(NH 2 ) 2 /HCl, respectively. After 5 cycles, the extraction performance of [1,4,7-TMTA][Tf 2 N] maintained. In summary, this paper overcame the obstacle of slow kinetics of solvent extraction technology, and pointed out a way for polymetallic co-extraction and separation in HLLE system.
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