CRYSTENGCOMM
·
2022
·Vol. 24
·期 36
·6392-6399
·
IF 3.756
Yuhan Kong,Gongguo Zhang,Chunyu Wang,Yanyun Ma,Yiqun Zheng
Noble metal Janus nanocrystals involving components with the same crystal structure and close lattice constants are technically difficult to produce as anisotropic growth is not favored under general deposition conditions. Herein, taking Au and Ag, we describe a feasible synthetic strategy to create Au–Ag Janus nanoparticles (JNPs) with tunable sizes, which exhibit multiple plasmonic absorptions in the UV-vis range. The success of the current synthesis lies in the surface doping of trisoctahedral (TOH) Au seeds with limited amount of Pt/Ag atoms to introduce a relatively large lattice strain during the seeded growth, which is found crucial to facilitate the anisotropic deposition of Ag. In contrast, the use of undoped Au seeds leads to the formation of Au@Ag core–shell nanoparticles. The size of resulting products could be tuned by varying the amount of the added Ag precursor or the size/quantity of Au seeds. Compared to core–shell counterparts, the current Au–Ag Janus nanoparticles exhibit more plasmonic absorption peaks. Owing to such advantages, the current Au–Ag Janus nanoparticles show enhanced catalytic properties in the reduction of 4-nitrophenol under UV-vis light irradiation. The current study provides a feasible strategy that allows the fabrication of Janus bimetallic nanocrystals with elements having a close lattice constant and validates the promising use as plasmonic catalysts, which could be potentially extended to other metals or alloys.
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Nanoscale
·
2020
·Vol. 13
·期 5
·3136-3143
·
IF 6.895
Wei Wei,Tingting Bai,Ruining Fu,Litao Sun,Wen Wang,Meng Dong,Lei Chen,Zhirui Guo,Feng Xu
Controlling the growth, structure and morphology of core–shell nanoparticles (NPs) is significant for catalytic applications and it can be achieved by adding chemical additives to the synthesis reaction mixture. However, achieving precise control over NP synthesis would require a comprehensive understanding of the mechanisms of NP formation under different chemical conditions, which is quite challenging. Here, using in situ liquid cell transmission electron microscopy (TEM), the overgrowth mechanisms of Ag on Au nanobipyramids (NBPs) are studied in AgNO3 aqueous solution with ascorbic acid as the reducing agent. Au–Ag core–shell NPs are formed via two mechanistic modes: (1) atom deposition during which the Ag atoms are deposited directly onto Au NBPs without the addition of poly(vinyl)pyrrolidone (PVP) and (2) nuclei coalescence during which the Ag nanocrystals (NCs) adsorb onto Au NBPs in the presence of PVP. High-resolution imaging reveals the dynamics of the coalescence process of Ag NCs upon addition of PVP. This study helps us to understand the effect of chemical additives during the evolution of a core seed into core–shell NPs with a well-defined composition and shape. It is useful for synthesizing NPs with greater design flexibility and expanding their various technological applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yao Wang,Hanlun Xu,Xiaoyu Wang,Pengqi Lu,Jiaqi Zhu,Nasir Ali,Huizhen Wu
An ordered metal array normally can enhance the electric field near the surface by generating strong excitation of surface plasmons (SPs), while two-dimensional materials (2DMs) can ensure efficient adsorption of the aromatic molecules. Herein, an AuNPs/GaTe/Au-hole array structure for SERS is first theoretically simulated and successively prepared experimentally. The parameters of the Au-hole array are optimized through finite-difference time-domain (FDTD) numerical simulations; including period, depth, and geometry. With Rhodamine 6G (R6G) probe molecules, the strongest Raman signal is observed at the edge of the Au-hole. The corresponding enhancement factor reached as high as 1.8 × 10 6 , which enabled the limiting detection concentration of 10 −16 M of R6G, surpassing most of the existent SERS substrates. Simulations of GaTe, AuNPs/GaTe/Au-film, and AuNPs/GaTe/Au-hole array are applied to explain the observation of SERS activity in the Au-hole array structure. Moreover, the structure exhibited good reproducibility and stability.
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ANALYTICA CHIMICA ACTA
·
2016
·
IF 4.712
Liyuan Wang,Jiao Shan,Feng Feng,Zhanfang Ma
A novel electrochemical redox-active nanocomposite was synthesized by a one-pot method using N,N′-diphenyl-p-phenylediamine as monomer , and HAuCl 4 and K 2 PtCl 4 as co-oxidizing agents. The as-prepared poly(N,N′-diphenyl-p-phenylediamine)-Au/Pt exhibited admirable electrochemical redox activity at 0.15 V, excellent H 2 O 2 electrocatalytic ability and favorable electron transfer ability. Based on these, the evaluation of the composite as sensing substrate for label-free electrochemical immunosensing to the sensitive detection of carbohydrate antigen 199 was described. This technique proved to be a prospective detection tool with a wide liner range from 0.001 U mL −1 to 40 U mL −1 , and a low detection limit of 2.3 × 10 −4 U mL −1 (S/N = 3). In addition, this method was used for the analysis of human serum sample, and good agreement was obtained between the values and those of enzyme-linked immunosorbent assay, implying the potential application in clinical research. Importantly, the strategy of the present substrate could be extended to other polymer-based nanocomposites such as polypyrrole derivatives or polythiophene derivatives, and this could be of great significance for the electrochemical immunoassay .
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Nanoscale
·
2014
·Vol. 6
·期 14
·7954-7958
·
IF 6.739
Wenya Cai,Xianghu Tang,Bai Sun,Liangbao Yang
In this study, multifunctional Fe3O4/C/Au nanoparticles (NPs), which catalytically integrated active small Au NPs with surface-enhanced Raman scattering (SERS) active large Au NPs, were fabricated via a facile method and employed for the in situ SERS monitoring of a catalytic reaction of p-nitrothiophenol (p-NTP) to p-aminothiophenol (p-ATP). In addition, the effect of magnet power was tested and it was demonstrated that the SERS intensity of the reaction system was stronger, and the reaction proceeded more smoothly because more hot spots existed and remained the same in the magnetic field; hence, the catalytic rate could be determined.
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ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Weijia Xie,Jianping Zhou,Sumei Huang,Wei Ou-Yang,Wenhui Xie,Zhuo Sun,Xiaohong Chen
Plasmon enhanced perovskite solar cells (PSCs) incorporated with AgAl and Au composite nanoparticles (NPs) isolating from AgAl metal electrode with ultra-thin LiF spacer were investigated. PSCs with AgAl-Au composite NPs got 17.02% of the power conversion efficiency (PCE), which is 11.10% higher than PCE (15.32%) of the control PSC with only AgAl electrode. Furthermore, the hysteresis effect of PSCs with LiF modified AgAl and Au composite NPs can be neglected compared to the control cells without NPs and LiF spacer. In the meanwhile, carrier transport and collection probabilities of PSCs with AgAl and Au composite NPs were increased to 96.86% from 89.51% in control cells, indicating the improved electron transport and extraction ability. The enhanced PCEs of PSCs with AgAl(3 nm)/Au(2 nm)/LiF(1 nm) are attributed to the improved light absorption of perovskite layer and the reduced contact barrier at metal electrode, which can be supported with its enhanced photon-to-electron conversion efficiency (△IPCE) and the disappeared negative capacitive behavior. Furthermore, the obviously reduced work function values of AgAl-Au composite NPs and AgAl metal electrode after LiF modification were observed with ultraviolet photoelectron spectroscopy spectra. Our results indicate that thermally evaporating a ultra-thin LiF spacer can well inhibit the energy dissipation of plasmon effects of AgAl-Au composite NPs and reduce the contact barrier between PCBM and AgAl metal electrode, which is an efficient strategy to achieve efficient plasmon-enhanced perovskite solar cells .
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TALANTA
·
2015
·
IF 3.545
Yange Sun,Xingxing He,Jian Ji,Min Jia,Zhouping Wang,Xiulan Sun
This paper presents a new electrochemical DNA biosensor constructed using a substrate electrode composed of a novel nanocomposite material prepared using gold nanoparticles (Au-NPs) and multiwalled carbon nanotubes (MWCNTs) and further modified with an Au electrode (AuE), which was used as the substrate electrode. A single-stranded DNA (ssDNA) probe was immobilized on the Au-NPs/CS–MWCNTs/AuE electrode by means of facile gold–thiol affinity, which resulted in hybridization with the target ssDNA sequence. Hybridization reactions were assessed by using the reduction peak current of methylene blue (MB) as an electrochemical indicator. The advantages of the nanomaterials were found to include high surface area, favorable electronic properties, and strong electrocatalytic activity . The amount of ssDNA adsorbed on the electrode surface was increased and the electrochemical response of MB accelerated. The differential pulse voltammetric responses of MB were in line with the specific target ssDNA sequence within the concentration range 1.0×10 −15 –1.0×10 −8 M with the detection limit 3.3×10 −16 M (3 σ ). In the colony forming unit (CFU) we were able to detect 10 CFU mL −1 of Staphylococcus aureus in the tap water, achieving good discrimination ability between one- and three-base mismatched ssDNA sequences. The polymerase chain reaction (PCR) amplification products of S. aureus nuc gene sequence were also detected with satisfactory results.
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PubMed
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 14
·4826-4834
·
IF 7.367
Huicheng Hu,JingJing Liu,Jiaqi Yu,Xuchun Wang,Haowen Zheng,Yong Xu,Min Chen,Jie Han,Zhuang Liu,Qiao Zhang
Janus nanostructures that possess two or more distinct components and surface functions have attracted more and more attention. Here, we present a seed-shape defined growth mechanism for the preparation of anisotropic Janus nanostructures, in which the shape of periodic mesoporous organosilica (PMO) is determined by the shape of Au nanoparticles. Various shaped Au@PMO composite nanostructures, such as rods, spheres, and plates, are prepared based on this general growth mechanism. By adjusting the reaction parameters (temperature, surfactant), various shaped AuNR@PMO Janus nanostructures, including horsebean- and fingernail-like nanostructures, have been successfully prepared. We also demonstrate the potential applications of such composite nanostructures. As an example, the as-prepared rod-like Janus Au@PMO nanostructures show great performance in chemo-photothermal combination therapy because of the excellent photothermal effect of Au nanorods and the high surface area of PMO nanorods. This research may open a new direction to the controllable synthesis and practical application of dedicated nanostructures with desired properties.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 5
·1-8
·
IF 5.705
Chen Wanlu,Yao Xun,Zhou Xinchun,Zhao Kang,Deng Anping,Li Jianguo
A flower-like Au/Cu alloy nanocomposite (Au/Cu NFs) was synthesized and used in an electrochemiluminescence (ECL) based method for sensitive determination of the dye Sudan I. The Au-g-C 3 N 4 nanosheets as an ECL emitter were prepared by electrostatic adsorption between gold nanoparticles and g-C 3 N 4 . They form a film on a glassy carbon electrode (GCE) and then can be connected with Sudan I antigen via gold-nitrogen bond and amidation reactions. The Au/Cu NFs combined with Sudan I antibody also via the Au-N bond and was introduced into the modified GCE by specific recognition between the antibody and the antigen. The overlap between emission spectra of the Au-g-C 3 N 4 nanosheets and absorption spectra of Au/Cu NFs enabled the appearance of ECL resonance energy transfer process. That is, when the Sudan I analyte not present, the ECL was weakened due to absorption by the gray Au/Cu NFs on applying voltages from −1.7 V to 0 V. Conversely, the Au/Cu NFs on the GCE are reduced due to the competition for the antibody between the analyte and the antigen. A strong green ECL emission was obtained. The ECL response is linear in the 0.5 pg mL −1 to 100 ng mL −1 Sudan I concentration range, and the detection limit is 0.17 pg mL −1 .
An Au/Cu alloy flower-like nanocomposite (Au/Cu NFs) is firstly synthesized as an acceptor to constitute an electrochemiluminescence-resonance energy transfer (ECL-RET) system for sensitive measurement of Sudan I, while Au nanoparticles (Au NPs) functionalized graphitic carbon nitride (g-C 3 N 4 ) acted as a donor.
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Materials Today Chemistry
·
2025
·
IF 6.7
Xiaoman Qi,Yonghui Xia,Jingtao Wu,Xuan Wan,Tianyu Wang,Qing Li,Guangli Li
The abuse of marbofloxacin (MBF) leaves residues in foods and environment. Therefore, developing a selective method for trace determination of MBF is of great significance. Herein, a bimetallic Au@Ag nanoparticle-decorated black phosphorus nanosheet-supported molecularly imprinted polymer film (MIP/BPNS-Au@AgNP) was fabricated for label-free and robust MBF sensing. In the presence of MBF, a polypyrrole film was grown onto the surface of BPNS-Au@AgNPs via potentiodynamic scanning. Au@AgNP functionalization prevented BPNS from degrading in aqueous solutions, enhanced its electrical conductivity, and provided a larger surface area to accommodate more selective imprinted cavities. Hence, the MIP/BPNS-Au@AgNP film demonstrated excellent electrochemical activity for MBF oxidation, including a broad linear dynamic concentration range (0.001–10 μM) and a low limit of detection (0.13 nM). Moreover, the MIP/BPNS-Au@AgNP film exhibited outstanding signal discrimination ability against potential interfering species and retained robust responses for four weeks. The MIP/BPNS-Au@AgNP film could also determine trace amounts of MBF in milk, sewage, and serum.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Xiang-Cheng Lin,Jian Liu,Miaomiao Hu,Lingjun Song,Minzhe Li,Qinjie Kou,Rong Huang,Lixian Sun,Changchun Wen
The abnormal fluctuations of glutathione (GSH) in vivo often reflect disease progression and are closely linked to human metabolism and physiological functions. Highly sensitive and selective detection of GSH is crucial for guiding early diagnosis and treatment; however, achieving this remains a significant challenge. In this study, we developed an enzyme activity sensor platform for the efficient detection of GSH. This platform utilizes Au@CuS core–shell materials loaded with CuO 2 nanoparticles to create a composite nanosensor system. Under slightly acidic conditions, CuO 2 on the nanomaterial’s surface decomposes into H 2 O 2 and Cu 2+ ions. The generated H 2 O 2 then reacts with tetramethylbenzidine (TMB) in the presence of peroxidase-like CuS to yield oxidized tetramethylbiphenyl ( OX TMB), which generates a distinctive Raman signal. Upon addition of GSH to the system, the unique OX TMB signal diminishes due to GSH’s strong antioxidant capacity and the consequent consumption of OX TMB. This sensing method enables sensitive detection of GSH, with a detection limit as low as 1.2 × 10 -13 mol∙L -1 . This approach holds promise for providing researchers with rapid and precise in vitro analysis of GSH, serving as an indicator for early disease diagnosis and real-time evaluation of treatment efficacy.
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高影响因子
Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 6
·867-872
·
IF 1.889
Du Jingjing,Song Ya,Feng Yahui,Li Na,Tan Haihu,Li Changyun,Xu Lijian
Hierarchically nanoporous Ti–SiO2 particles were synthesized by dissolving template method, and the hierarchically nanoporous Au@Ti–SiO2 particles were further prepared by in-situ synthesis method using NaBH4 as reducing agent. The
components of the hierarchically nanoporous Au@Ti–SiO2 particles and Ni–W–Co alloy electrode were investigated by energy dispersive spectrometer (EDS). In addition, the hierarchically nanoporous Au@Ti–SiO2/Ni–W–Co composite electrode
was fabricated by the method of composite electrodeposition using hierarchically nanoporous Au@Ti–SiO2 particles as composite nanoparticles. Finally, the electrocatalytic activities for hydrogen evolution of different electrodes were investigated. Results showed that, the
mass fractions of Ni, W and Co were 62.78%, 11.75% and 25.47% respectively in the coating of Ni–W–Co alloy electrode. The mass fractions of Au and Ti were 0.94% and 4.21% respectively in the hierarchically nanoporous Au@Ti–SiO2 particles which indicated that the
Au nanoparticles were successfully doped into the hierarchically nanoporous Ti–SiO2 particles. And the results of electrocatalytic activity study showed that, Co and W have good electrocatalytic activity for hydrogen evolution, which can greatly improve the electrocatalytic
activity for hydrogen evolution. The electrocatalytic activity of Ni–W–Co alloy electrode was superior than that of Ni electrode and Ni-Walloy electrode. The electrocatalytic activity for hydrogen evolution of hierarchically nanoporous Au@Ti–SiO2/Ni–W–Co
composite electrode was improved because of adding Au@Ti–SiO2 and reached the optimal value when the concentration of nanoporous Au@Ti–SiO2 particles was 1.6 g/L.
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