SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Cunwei Wang,Man Peng,Xishun Peng,Haili Zhang,Caizhen Zu,Zhangwei Tan,Yuxue He,Zhongchen Bai
This study presents a surface-enhanced Raman scattering (SERS) sensing platform based on a MoS 2 /Au@Ag heterojunction for specifically detecting the residues of thiram pesticide. A Nano-MoS 2 film was firstly prepared by depositing MoS 2 nanosheets on the surface of a stainless steel sheet. Subsequently, Au nanoparticles and Ag nanoparticles were deposited on the surface of MoS 2 film to form a MoS 2 /Au@Ag heterojunction for SERS application. This well-performing SERS substrate was originated from the synergistic effect of electromagnetic (EM) enhancement and chemical (CM) enhancement to boost its SERS signal. Here, the CM contribution could be up to 41.8 % in the process of optimizing interfacial charge transfer (CT) pathways in MoS 2 /Au@Ag heterojunction. Thus, the SERS sensor based on MoS 2 /Au@Ag film showed an excellent signal homogeneity (RSD = 4.36 %) and an ultrahigh sensitivity to thiram molecules with a limit of detection (LOD) as low as 0.32 nM. Moreover, it could also recognize the thiram residues at 10 nM level in citrus peels, with a recovery rate of 91.0–109.0 %. The SERS sensor we developed in this study has a high sensitivity, excellent reproducibility, and long-term stability, which could be widely applied for the food safety monitoring
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高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1078
·
IF 3.9
Ze Hong,Jingying Ouyang,Jiaxin Li,Han Zheng,Ying Liu
Multi-heterojunctions are more promising than single heterojunctions in photocatalysis due to the availability of more interfaces between each component. However, photocatalytic activity is highly dependent on the contact mode of individual components. In this work, we assembled gold nanoparticles/oxygen-deficient (anatase/B-phase) TiO2multi-heterojunction microspheres using spray pyrolysis and focused on their contact mode-governed photocatalytic activity. The results reveal that using oxygen-deficient (anatase/B-phase) TiO2microspheres as building blocks could significantly enhance the absorption of visible light and the photocatalytic activity of a gold–TiO2system toward the photocatalytic carbon monoxide oxidation. Furthermore, loading gold nanoparticles onto B-phase TiO2could facilitate a more prominent enhancement of activity than that of pure B-phase TiO2, benefiting from the two-electron reduction of oxygen at the interface of TiO2/Au. Meanwhile, the high crystallinity of B-phase TiO2microspheres allows for a gold loading amount of 1 wt% in the gold/(anatase/B-phase) TiO2system, which is 1.67 times more active than pure B-phase TiO2microspheres, in the photocatalytic oxidation of carbon monoxide to generate carbon dioxide.Keywords:photocatalytic carbon monoxide oxidation;B-phase TiO2;oxygen-deficient;microspheres
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NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 41
·期 4
·1509-1517
·
IF 3.277
Shanshan Fu,Guojuan Ren,Shuang Li,Fang Chai,Chungang Wang,Fengyu Qu
In this work, cyclic annular Au–Cu nicotinates were synthesized through a facile one-pot method. Cupric nitrate trihydrate, hydrogen tetrachloroaurate and nicotinic acid were used as the initial reactants; nicotinic acid was found to be an excellent ligand. The Au–Cu nicotinate annularity rings were characterized by X-ray diffraction, transmission electron microscopy and scanning electron microscopy with energy-dispersive X-ray spectroscopy. Specifically, the shape of the assembled Au–Cu nicotinate rings can be readily controlled by changing the ratio of the reactants and the reaction time. The mechanism of growth of the Au–Cu nicotinate annular rings was also investigated; the results of the experiments indicate that the Au–Cu nicotinate annular rings were assembled from ultrathin nanosheets. The Au–Cu nicotinate rings exhibit excellent catalytic activity toward the reduction of nitrophenols (including 2-nitrophenol, 3-nitrophenol, 4-nitrophenol and 4-nitrothiophenol) by sodium borohydride in water. Experimentally, the optimized ratio of the components was found to be Au : Cu : nicotinate close to 1 : 4 : 1. Kinetic rate investigations were carried out for the Au–Cu NRs-catalyzed reactions at different cycles. Importantly for their use as catalysts, the Au–Cu nicotinate rings can be recycled and exhibit good reusability. These results indicate that Au–Cu nicotinate rings are an effective catalyst for environmental wastewater treatment.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zhenping Liu,Mingliang Jin,Jieping Cao,Juan Wang,Xin Wang,Guofu Zhou,Albert van den Berg,Lingling Shui
In this work, a high-sensitive electrochemical sensor of Norfloxacin (NFX) has been developed using a composite electrode of MWCNT-CPE/pRGO-ANSA/Au. MWCNT-CPE is the multi-walled carbon nanotubes (MWCNT) – carbon paste electrode (CPE). pRGO-ANSA means the partially reduced graphene oxide (pRGO) – 6-aminonaphthalene-2-sulphonic acid (ANSA) hybrid nanomaterials. Au represents gold nanoparticles. The electrochemical sensing of NFX was investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and differential pulse voltammetry (DPV). Experimental results show that the combination of MWCNT-CPE/pRGO-ANSA/Au offers high electrical conductivity, large surface area and excellent electrocatalytic activity, being beneficial for electrochemical sensing performance. The calibration curves of NFX exhibit linear response in the NFX concentration range of 0.03–1.0 and 1.0–50.0 μM, with the limit of detection (LOD) of 0.016 μM (S/N = 3). The fabricated sensors were successfully applied for detecting the presence of NFX in pharmaceutical formulations and rat plasma samples. The measured results were comparable with those obtained using ultrahigh performance liquid chromatography (UHPLC), indicating its high potential for applications in pharmaceutical analysis and clinical therapeutic drug monitoring.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Jinyong Hu,Xing Liu,Jiawei Zhang,Xin Gu,Yong Zhang
Developing high-performance gas-sensing devices based on transition metal dichalcogenides (TMDs) has sparked significant research interest in efficient detection of hazardous gases at room temperature . Considering that the gas-sensing performances of TMDs-based sensors can be effectively improved by the localized surface plasmon resonance (LSPR) effect of decorated noble-metal nanoparticles, herein, we explored the LSPR effect on gas-sensitive features via the design of a visible-light-assisted gas sensor using Au@MoS 2 core-shell heterostructures as sensitive materials. The internal connection between the optical absorption and the gas-sensing properties of Au@MoS 2 heterostructures was investigated. Intriguingly, under the activation of indoor white-light, the optimized Au@MoS 2 sensor displayed an enhanced response by more than 8 times and elevated recoverability from 60% to 98% almost without baseline shift as compared with the pure MoS 2 gas sensor for the detection of NO 2 (1 ppm). The combination of experimental and theoretical analysis indicates that the improved gas-sensing performances can be primarily attributed to the effective amplification of the light absorption efficiency of MoS 2 induced by the LSPR effect from the Au nanoparticle cores. These results imply a potential application in monitoring NO 2 gas at room temperature and open up an effective thoughtway for developing high-performance visible-light-modulated gas sensors.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2017
·Vol. 64
·期 11
·1308-1315
·
IF 0.935
Ming-Hai Zhang,Guo-Bin Yi,Xi-Hong Zu,Hai-Liang Huang,Yun-Jia Wang,Jian-Chao Wang,Ben-Bin Zhong,Hong-Sheng Luo
In this study, the galvanic displacement reaction between silver and AuCl 4 − was carried out to synthesize a series of silver nanowire (Ag NW) @ gold nanoparticle (Au NP) hybrid nanowires. The influence of Ag NW @ Au NP hybrid nanowires on the fluorescence properties of the poly (3-hexylthiophene) (P3HT) was investigated. The particle sizes of Au NPs on the hybrid nanowires could be adjusted by varying the reaction time and the concentration of the HAuCl 4 solution. Furthermore, steady-state fluorescence measurements showed that the fluorescence intensity of the P3HT films was higher on various Ag NW @ Au NP hybrid nanowires compared to that on a bare silicon substrate. This was due to the increase in the intensity of electromagnetic field by the localized surface plasmon resonances of Au NPs and surface plasmon polaritons of Ag NWs from the hybrid nanowires. The results were further confirmed by the Raman spectra of the P3HT films on different substrates.
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NANOTECHNOLOGY
·
2025
·Vol. 36
·期 32
·325601
·
IF 2.8
Binghua Long,Jingjing Zhang,Hairui Deng,Xu Sun,Yuguang Lu,Xiaoqing Lin,Abdul Wahab,Han Zhang,Muhammad Zubair Iqbal,Xiangdong Kong
Janus nanoparticles (JNPs) represent one of the most complex nanoparticles, and achieving precise control over their synthesis remains a significant challenge. Here, we explore gold–silver sulfide (Au–Ag2S) JNPs for targeted anticancer and antibacterial therapies. Au–Ag2S JNPs were synthesized and characterized using transmission electron microscopy, high-resolution transmission electron microscopy (HRTEM), x-ray powder diffraction, energy-dispersive x-ray spectroscopy (EDS), and x-ray photoelectron spectroscopy confirming their distinct dimeric structure with Au and Ag2S components. Surface modification with 1,2-Distearoyl-sn-glycero-3-phosphoethanolamine-Polyethylene Glycol (DSPE-PEG) and folic acid enhanced stability and enabled targeted delivery to cancer cells, resulting in AADF JNPs. AADF JNPs exhibited strong near-infrared (NIR-II) emission, ideal for in vivo imaging and photothermal therapy. In vitro studies demonstrated high biocompatibility and enhanced cellular uptake in 4T1 cancer cells compared to non-targeted JNPs. Upon laser irradiation, AADF JNPs effectively reduced 4T1 cell viability, demonstrating their phototherapeutic effect. Furthermore, AADF JNPs exhibited potent antibacterial activity against Escherichia coli and Staphylococcus aureus under NIR irradiation, it achieved 78% tumor cell killing and 99% bacterial eradication. These findings highlight the potential of AADF JNPs as a promising solution for targeted cancer and bacterial infection treatments.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 11
·718
·
IF 5.4
Ma Chen,Zhang Yida,Mu Shuai,Zhang Yuan,Wei Shuoyun,Li Quanfang,Ren Shufang
A novel Hg 2+ sensing strategy has been developed based on a Mn-Au hybrid nanozyme with prominent oxidase-like activity and an aptamer-controlled catalytic switching mechanism. First, a Mn-Au hybrid nanozyme (MnAuNPs) with a distinctive “fried-egg-like” core–shell morphology was synthesized, which exhibited remarkable oxidase-like activity and rapidly oxidized 3,3’,5,5’-tetramethylbenzidine (TMB) into the characteristic blue product (OxTMB) without H 2 O 2 . The Hg 2+ -specific aptamer can adsorb onto the surface of MnAuNPs through electrostatic and Mn-phosphate coordination interactions, which blocks the catalytic sites and markedly suppresses the oxidase-like activity. In the presence of Hg 2+ , the specific T-Hg 2+ -T coordination triggers the detachment of the aptamer from the MnAuNPs surface, thereby restoring oxidase-like activity and inducing distinct color and absorbance change. Accordingly, an effective colorimetric platform for Hg 2+ detection was developed, exhibiting a linear response over the range of 1.0–50 μM with a limit of detection (LOD) of 0.32 μM. In parallel, a paper-based smartphone-assisted sensing platform was developed, enabling on-site Hg 2+ detection in the range of 5.0–50 μM with LOD of 5.0 μM. Through the colorimetric and smartphone-assisted method, accurate quantification of Hg 2+ in the Yellow River water and wastewater samples were achieved with the results in good agreement with those obtained by ICP-OES. Overall, this work establishes a simple and portable H 2 O 2 -free colorimetric sensing strategy based on Hg 2+ -induced catalytic switching for environmental Hg 2+ monitoring. Graphical
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2022
·
IF 4.52
Haishuai Peng,Yuanyuan Hui,Meixue Pu,Ding Yang,Aiqing Zhao,Weizhe Wang,Shan Wu,Bini Wang
Streptomycin (STR) residues in dairy products could cause serious health risks for human or affect the quality of the dairy products fermented by lactic acid bacteria , thereby resulting in economic losses. Thus, STR detection methods need to be developed quickly, simply, and sensitively. In this study, polyethyleneimine (PEI)-functionalized NH 2 -MIL-101(Fe) (PEI-Fe-MOF) was characterized and found to exhibit an enhanced electrochemical characteristics, when compared to Fe-MOFs. [email protected] core-shell NPs could further amplify its electrochemical signal. Based on the PEI-Fe-MOF/ [email protected] NPs nanocomposites, we have developed a novel electrochemical aptasensor to detect STR rapidly. When detected under optimal conditions, a wide linear range between 0.1 and 200 nM was observed for the aptasensor with a detection limit of 0.033 nM. Furthermore, the developed aptasensor has been satisfactorily applied for the rapid STR detection in dairy products with recoveries ranging from 98.2% to 110.1%. Therefore, our method can be considered a new effective method for the rapid detection of STR in dairy products.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2013
·Vol. 15
·期 46
·20140-20146
·
IF 3.829
Li Shi,Ting Yu,Luwei Sun,Xiaodong Pi,Xinsheng Peng
A free-standing fluorescent gelatin–Si nanoparticle composite thin film is facilely prepared by means of a filtration technique assisted by porous copper hydroxide nanostrands as a sacrificial layer. The as-prepared gelatin–Si nanoparticle composite film is greatly portable, flexible, transparent and free-standing. The most important advantage is its robust storage stability stored in ambient air, which make it promising for various applications. Meanwhile, a gelatin–Si–Au nanoparticle composite film is also successfully prepared by the formation of Au NPs in a gelatin–Si nanoparticle composite film through the in situ reduction of HAuCl4 at room temperature. The photoluminescence (PL) quenching and blue shift in the peak of the emission spectra occur due to the energy transfer from Si NPs to Au NPs. By varying the amount and size of Au NPs incorporated into the gelatin–Si nanoparticle composite film, the energy transfer efficiency can be controlled. This is a general method to prepare metal–semiconductor hybrid fluorescent nanomaterials, which offers the possibility of tuning the luminescence intensity and wavelength of the emitted light.
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Advanced Materials Interfaces
·
2016
·Vol. 3
·期 22
·1600588
·
IF 3.365
Huimin Shi,Xuejiao Wang,Mengjie Zheng,Xing Wu,Yiqin Chen,Zhengmei Yang,Guanhua Zhang,Huigao Duan
Rational engineering hierarchical 3D nanostructures with high visible-light photocatalysis and long-term cycling stability are of great importance in environmental purification and energy conversion. A novel and scalable approach is demonstrated to fabricate hierarchical plasmon-resonance-induced black Au–TiO 2 nanorod arrays (NRAs) on flexible carbon cloth (CC). With the advantages of hierarchical morphology, plasmon-enhanced visible-light absorption, facile charge separation enabled by single-crystalline TiO 2 and conductive substrate, the black Au–TiO 2 NRAs on CC show more than 13 times higher visible-light photocatalytic efficiency enhancement compared to that of bare TiO 2 NRAs. Meanwhile, the hybrid Au–TiO 2 –C system shows extremely high chemical and mechanical stability. The visible-light photocatalysis does not show any decrease after consecutive seven times test. More remarkably, after being continuously stirred in aqueous solution for 60 d, almost no decrease of photocatalytic activity is observed. The UV–vis absorption measurement, optical simulations, and the control experiment on hierarchical Au–SiO 2 @TiO 2 NRAs reveal that the enhanced visible-light photocatalysis is caused by the plasmon-induced hot-electrons transfer from Au nanoparticles to neighboring TiO 2 NRAs. The high visible-light photocatalytic performance and the excellent chemical/mechanical stabilities imply that the black Au–TiO 2 NRAs on CC can serve as potential photocatalytic materials for large-scale applications in energy conversion and pollutants purification.
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ACS Nano
·
2024
·
IF 15.8
Bingxi Feng,Zizheng Wang,Youyou Feng,Ping Li,Yongheng Zhu,Yonghui Deng,Limin Wu,Qin Yue,Jing Wei
Semiconductor metal oxide gas sensors have been proven to be capable of detecting Listeria monocytogenes, one kind of foodborne bacteria, through monitoring the characteristic gaseous metabolic product 3-hydroxy-2-butanone. However, the detection still faces challenges because the sensors need to work at high temperatures and output limited gas sensing performance. The present study focuses on the design of single-atom Au-functionalized mesoporous SnO2 nanospheres for the sensitive detection of ppb-level 3-hydroxy-2-butanone at low temperatures (50 °C). The fabricated sensors exhibit high sensitivity (291.5 ppm–1), excellent selectivity, short response time (10 s), and ultralow detection limit (10 ppb). The gas sensors exhibit exceptional efficacy in distinguishing L. monocytogenes from other bacterial strains (e.g., Escherichia coli). Additionally, wireless detection of 3-hydroxy-2-butanone vapor is successfully achieved through microelectromechanical systems sensors, enabling real-time monitoring of the biomarker 3-hydroxy-2-butanone. The superior sensing performance is ascribed to the mesoporous framework with accessible active Au–O–Sn sites in the uniform sensing layer consisting of single-atom Au-modified mesoporous SnO2 nanospheres, and such a feature facilitates the gas diffusion, adsorption, and catalytic conversion of 3-hydroxy-2-butanone molecules in the sensing layer, resulting in excellent sensing signal output at relatively low temperature that is favorable for developing low-energy-consumption gas sensors.
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