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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DOI
高影响因子
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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高影响因子
Nano Research
·
2021
·Vol. 15
·期 1
·317-325
·
IF 8.897
Zuo Zewen,Sun Lianye,Guo Yongbin,Zhang Lujun,Li Junhu,Li Kuanguo,Cui Guanglei
Plasmon coupling is an essential strategy to realize strong local electromagnetic (EM) field which is crucial for high-performance plasmonic devices. In this work, multiple plasmon couplings are demonstrated in three-dimensional (3D) hybrid plasmonic systems composed of polydimethylsiloxane-supported ordered silver nanocone (AgNC) arrays decorated with high-density gold nanoparticles (AuNPs) which are fabricated by a template-assisted physical vapor deposition process. Strong interparticle coupling, particle-film coupling, inter-cone coupling, and particle-cone coupling are revealed by numerical simulations in such composite nanostructures, which produce intense and high-density EM hot spots, boosting highly sensitive and reproducible surface enhanced Raman scattering (SERS) detection with an enhancement factor of ∼ 1.74 × 10 8 . Furthermore, a linear correlation between logarithmic Raman intensity and logarithmic concentration of probe molecules is observed in a large concentration range. These results offer new ideas to develop novel plasmonic devices, and provide alternative strategy to realize flexible and high-performance SERS sensors for trace molecule detection and quantitative analysis.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Mei Hong,Bingyu Wang,Xiaoling Xu,Peng Bin,Jingyu Zhang,Qiang Zhang
The catalytic membrane reactor (CMR) is recognized as one of the most effective strategies to treat the organic wastewater system. Yet so far, inefficiency, lack of bactericidal ability, and serious membrane fouling have limited its further application. In this study, we designed a novel polyacrylonitrile (PAN) catalytic separation membrane loaded with gold nanoparticles (Au NPs) via a facile photopolymerization method. The Au NPs on the catalytic separation membrane (PAN-Au) surface can serve as a high-performance catalyst, and the ligand of the 4-vinylpyridine (4VP) acts as an efficient protecting ligand for Au NPs to avoid leakage and agglomeration. The PAN-Au membrane was applied to CMR, which can one-step catalytic separation of nitrophenols and methylene blue efficiently in a flow-through mode (up to 97.5% over multiple cycles of reuse). Even after contamination with organic dyes, the PAN-Au membrane can still recover the catalytic separation performance by self-cleaning. Moreover, a remarkable antibacterial (with an efficiency of ≈100%) activity of the PAN-Au membrane, with a strong correlation with the small-sized and well-distributed Au NPs loaded on the membrane surface . The tremendous catalytical, self-cleaning, and antibacterial performance of the PAN-Au membrane provides new insights for the rational design of flow CMR for industrial applications.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Wenhao Dong,Yipeng Ren,Zhixue Bai,Jun Jiao,Yuan Chen,Bingkai Han,Qiang Chen
An innovative epinephrine sensor was fabricated by integrating tetrahexahedral (THH) Au-Pd core–shell nanocrystals on reduced graphene oxide (rGO) nanosheets . Furthermore, the nanocomposites combined the large specific areas of rGO with the high-index facets and excellent electrocatalytic activity of the THH Au-Pd nanocrystals, and the nanocomposites were an essential adapter for detecting epinephrine. In the present work, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to identify and characterize these unique nanocomposites, and the results revealed that a unique THH Au-Pd/rGO core–shell nanostructure was synthesized successfully. To further explore the electrochemical behaviors of these nanomaterials at a GC electrode, we applied cyclic voltammetry (CV), differential pulse voltammetry (DPV) and amperometry to study the conductivity and electrocatalytic activity of the proposed sensor, and the results suggested that the sensor based on Au-Pd/rGO presented a lower limit of detection (0.0012 μM at a signal to noise ratio of 3), wide linear detection range (0.001 µM to 1000 µM), and extraordinary selectivity and reproducibility. Moreover, the data showed that the sensor possessed good stability and acceptable accuracy to detect epinephrine in human serum samples. In summary, this work is not only a potential way to manufacture various nonenzymatic sensors but also a significant contribution to further studies in catalysis, cell fuel cells and other relevant applications.
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高影响因子
ChemCatChem
·
2020
·Vol. 13
·期 1
·438-444
·
IF 4.853
Xianwei Wang,Nobutaka Maeda,Daniel M. Meier,Alfons Baiker
Graphical Potassium titanate (K 2 Ti 8 O 17 ) nanobelts (KTN) are a unique support for Au and bimetallic AuRh nanoparticles showing strong enhancement of the catalytic reduction of NO with CO to N 2 .The KTN support facilitates the formation of surface nitrate, carbonate and isocyanide species, resulting in superior catalytic activity compared to corresponding TiO 2 -supported catalysts. The catalytic reduction of NO with CO was examined over monometallic Au and bimetallic AuRh nanoparticles supported on potassium titanate (K 2 Ti 8 O 17 ) nanobelts (KTN) and TiO 2 . The highly crystalline KTN, prepared from TiO 2 by a hydrothermal process using KOH, were several μm long and ca. 8 nm wide. Both Au and bimetallic AuRh catalysts showed a striking enhancement of the catalytic performance with KTN as support, compared to corresponding TiO 2 -supported catalysts. The reasons for this behavior could be traced back using in situ diffuse reflectance infrared Fourier transform spectroscopy in tandem with modulation excitation spectroscopy, which proved that the KTN support promotes the formation of surface nitrate (−NO 3 − ), carbonate (−CO 3 2− ), and isocyanide (−NCO) species. In particular, the combination of KTN with bimetallic AuRh nanoparticles results in the facile formation of isocyanide, which is a pivotal intermediate for producing dinitrogen molecules via the reaction with NO; NCO (a) +NO (a) →N 2 +CO 2 .
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高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Xiaorong Gan,Huimin Zhao,Xie Quan,Yaobin Zhang
An ultrasensitive electrochemical sensor for Cu 2+ detection was first developed based on p-aminothiophenol (PATP) anchored on the surface of Au nanoparticle-decorated hydrogen-incorporated TiS 2 nanosheets (PATP/Au-H x TiS 2 ). In the synthesis process, the plane edges of H x TiS 2 nanosheets offered Au nanoparticles with incubation sites for the heterogeneous nucleation and growth. On the other hand, Au nanoparticles were not only served as an excellent electrical catalyst to facilitate electron transfer and as a substrate for loading PATP molecules by Au-S valent bonds, but also could effectively avoid the aggregation of H x TiS 2 nanosheets . Due to the synergetic effects from Au-H x TiS 2 for signal amplification, the as-formed electrochemical sensor exhibited highly sensitive and selective assaying of Cu 2+ with a detection limit of 90 pM (3σ) and a linear range from 0.2 nM to 5 μM, under optimal conditions. Its specificity was ascribed to the strong coordination interaction between Cu 2+ and N atoms of imine moieties in PATP after electrochemical oxidation .
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高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2017
·Vol. 49
·期 2
·245-255
·
IF 2.969
Xiu Liang,Xiao-Juan Zhang,Ting-Ting You,Nan Yang,Guang-Sheng Wang,Peng-Gang Yin
MoS 2 , a novel inorganic graphene analogues with typical two-dimensional structure, has attracted increasing interest in various fields. MoS 2 -based hybrid plasmonic structures have been extensively investigated as higher quality surface enhanced Raman scattering (SERS) substrates. Herein, we have designed a three-dimensional (3D) MoS 2 nanospheres (NSs) based hybrid nanostructure as SERS sensor by decorating Au nanoparticles (NPs) on the surface of 3D MoS 2 -NSs (3D MoS 2 -NS@Au-NPs). 3D MoS 2 -NSs acts as (a) a stable scaffold for Au NPs decoration via microwave-irradiation hydrothermal process, (b) a chemical mechanism source for Raman enhancement, and (c) a 3D spatial structure for generation of more effective hot spots due to Au coupling effect and supply larger surface area for adsorbing probe molecules. The 3D MoS 2 -NS@Au-NPs hybrid structure exhibits 56-fold improvement on enhancement factor compared to two-dimensional MoS 2 -NST@Au-NPs hybrid structures. SERS performance was easily and effectively optimized with the tuning of the density and sizes of Au NPs. The optimized 3D MoS 2 -NS@Au-NPs was applied as SERS sensor for melamine detection in milk. Quantitative detection was realized in the range of 1 ppb–10 ppm with a linear coefficient of .997. Excellent sensitivity of 1 ppb and uniformity of 10.12% relative standard deviation was achieved, which could meet the demand for melamine detection as prescribed by the U.S. Food and Drug Administration.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zixuan Yuan,Yiting Zhu,Leying Xue,Danhua Ge,Shuo Xue,Ying Xie,Wei Zhang,Xiaojun Chen
Overuse of the anti-tuberculosis drug isoniazid (INH) would cause serious damage to human health. Currently, commonly used analytical methods such as high-performance liquid chromatography, liquid chromatography/mass spectrometry, etc. often rely on large instruments and are difficult to achieve rapid INH detection. Herein, we established an efficient colorimetric method for detecting INH in human serum based on a novel Au-doped hollow double-shell Prussian blue analogue (Mn-PBA-DSNB@Au), which could be prepared through a series of simple co-precipitation, etching, and in-stiu reduction procedures. Due to the high specific surface area and multiple active sites of the hollow structure, the obtained Mn-PBA-DSNB@Au exhibits enhanced peroxidase-like activity, realizing the rapid oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB in the presence of hydrogen peroxide, producing a strong absorption at 652 nm. Based on the inhibitory effect of the reducing hydrazide group in INH upon the TMB colorimetric reaction, we constructed a sensitive colorimetric sensing platform for the determination of INH around Mn-PBA-DSNB@Au nanozymes. The developed INH sensor exhibited a linear range of 2–40 μM with a low detection limit of 0.835 μM. Furthermore, it could be extended to the actual detection of real human blood samples, achieving a recovery rate of 101.2 %–102.2 % with <2.6 % RSD.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Chong Chen,Yufei Liu,Kai Zhang,Qiao Fan,Tingting Luo,Shigui Peng,Lanlan Wei,Yucheng Yin,Min He,Jie Yu
Non-enzymatic electrochemical glucose sensors based on human sweat offer a new detection method that is non-invasive and suitable for continuous monitoring. They overcome limitations of traditional enzyme-based sensors, such as poor stability and strict storage requirements. This study developed a flexible electrochemical sensor using a composite of conductive polymer (P(EDOT-MeOH)), carboxylated multi-walled carbon nanotubes (COOH-MWCNTs), and gold nanoparticles (AuNPs) for highly sensitive and selective detection of glucose in sweat. COOH-MWCNTs provide a conductive network with high specific surface area. AuNPs enhance the electrocatalytic oxidation of glucose. The P(EDOT-MeOH) matrix improves the stability of the nanocomposite and effectively suppresses interference from electroactive substances such as uric acid and ascorbic acid in sweat. The sensor was fabricated using an electrodeposition process to layer the composite material onto a flexible screen-printed carbon electrode. This design offers both mechanical durability and wearability. Electrochemical tests showed that the sensor has a wide linear detection range (0.01–1 mM), a low detection limit (4.5 μM), and high selectivity under neutral conditions. The sensor maintained stable performance over 30 days and after 400 bending cycles, demonstrating its potential for wearable applications. During real-time sweat glucose monitoring in exercise conditions, results showed a strong correlation with blood glucose levels (R² = 0.976), confirming clinical applicability. This study provides a new strategy for developing low-cost, highly stable flexible non-enzymatic glucose sensors and supports the advancement of a new generation of wearable health monitoring devices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hongchao Geng,Rongfu Peng,Junning Wang,Yuting Dong,Yuzhang Yan,Jiahui Dong,Linlang Xu,Haiyan Kang,Xu Yan,Xia Zhang,Chaopeng Wang,Yanli Mao
The development of high-performance near-infrared (NIR) photocatalysts with long-term stability broaden the range of light absorption and improve the utilization rate of solar energy have not been explored sufficiently. Herein, a novel hybrid material of upconversion nanoparticle (NPs) CaF 2 : Yb, Er, Tm decorated with TiO 2 and Au NPs has been synthesized by a simple and robust solvothermal route for NIR light active photocatalysis. It has been found that effective energy transfer occurred from CaF 2 : Yb, Er, Tm to TiO 2 and Au NPs by a nonradiative luminescence resonance energy transfer process. The enhanced activity is attributed to the nanostructured architecture that favors the efficient charge transfer and the localized surface plasmon resonance effects of Au NPs. Thus, the heterojunction showed the synergetic effects of both upconversion and localized surface plasmon resonance features, which could broaden the absorption spectrum to the NIR. Our work demonstrates that CaF 2 :Yb,Er,Tm@TiO 2 -Au could be potential candidates for NIR active photocatalysts for environmental applications.
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高影响因子
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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DOI
PubMed
高影响因子
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