Nature Communications
·
2020
·Vol. 11
·期 1
·1-7
·
IF 12.121
Song Yongbo,Li Yingwei,Li Hao,Ke Feng,Xiang Ji,Zhou Chuanjun,Li Peng,Zhu Manzhou,Jin Rongchao
Gold-copper alloys have rich forms. Here we report an atomically resolved [Au 52 Cu 72 ( p -MBT) 55 ] + Cl − nanoalloy ( p -MBT = SPh- p -CH 3 ). This nanoalloy exhibits unusual structural patterns. First, two Cu atoms are located in the inner 7-atom decahedral kernel (M 7 , M = Au/Cu). The M 7 kernel is then enclosed by a second shell of homogold (Au 47 ), giving rise to a two-shelled M 54 (i.e. Au 52 Cu 2 ) full decahedron. A comparison of the non-truncated M 54 decahedron with the truncated homogold Au 49 kernel in similar-sized gold nanoparticles provides for the first time an explanation for Marks decahedron truncation. Second, a Cu 70 (SR) 55 exterior cage resembling a 3D Penrose tiling protects the M 54 decahedral kernel. Compared to the discrete staple motifs in gold:thiolate nanoparticles, the Cu-thiolate surface of Au 52 Cu 72 forms an extended cage. The Cu-SR Penrose tiling retains the M 54 kernel’s high symmetry ( D 5h ). Third, interparticle interactions in the assembly are closely related to the symmetry of the particle, and a “quadruple-gear-like” interlocking pattern is observed.
研究领域:
材料科学
·
纳米技术
·
化学
·
晶体学
✓ 已验证
DOI
PubMed
高影响因子
Science Bulletin
·
2018
·
IF 4.136
Qingfeng Xu,Wenlong Chen,Yucong Yan,Zhemin Wu,Yi Jiang,Junjie Li,Ting Bian,Hui Zhang,Jianbo Wu,Deren Yang
Incorporating Pt with core metals into Pt-based core-shell catalysts is regarded as a promising strategy to substantially enhance the catalytic properties towards oxygen reduction reaction (ORR) in fuel cells due to the synergetic effect between distinct metals. In this wok, ultrathin Pt skins with two atomic layers were epitaxially coated on as-prepared icosahedral Au 50 Pd 50 , Au 60 Pd 40 and Au 66 Pd 34 nanocrystal seeds, which are constructed with alloyed cores and Pd shells with different thickness. Through electron microscopic characterizations, Pd interlayers with tunable thickness of 3, 6, and 12 atomic layers can be found in the Au 66 Pd 34 @Pt, Au 60 Pd 40 @Pt and Au 50 Pd 50 @Pt icosahedra, respectively. These icosahedral AuPd@Pd@Pt nanocrystals show substantially enhanced activities and durabilities in electrocatalytic measurements towards ORR compared to Au 75 Pd 25 @Pt icosahedra without Pd interlayer and commercial Pt/C catalysts. Specifically, Au 60 Pd 40 @Pt icosahedra with 6 atomically thick Pd interlayer display the best electrocatalytic performances, whose mass activities before and after durability tests of 50,000 cycles are 11.6 and 30.2 times, respectively, as high as that of the commercial Pt/C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Jianbing Zhu,Meiling Xiao,Kui Li,Changpeng Liu,Xiao Zhao,Wei Xing
Highly active, durable oxygen reduction reaction (ORR) electrocatalysts are extremely important for fuel cell applications. Herein, we provide an efficient way to synthesis of activity Pt3M icosahedra by the one-pot hydrothermal method in the presence of glucosamine which can well adjust the reduction rate of Pt4+ and efficiently control the morphology of final catalysts. Compared to Pt/C, the Pt3Ni icosahedra show 32-fold and 12-fold enhancement in specific and mass activity, respectively. Furthermore, robust durability was also observed in the accelerated durability test. Thus, this Pt3Ni icosahedron is found among the best Pt-based ORR catalysts, moreover, the findings also demonstrate how to mimic active extended surfaces in nanoscale.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 5
·期 20
·1800783
·
IF 4.834
Fengting Cao,Tao Liu,Wenyan Si,Xichao Li,Shimei Sun,Xiaolin Sun,Quanhai Niu,Takeo Ohsaka,Jianfei Wu
Pt and Pt-based alloys are still the mainstream electrocatalysts for oxygen reduction reaction (ORR) so far, which is an important process for fuel cell. Herein, for the first time ternary icosahedral nanocrystals supported on carbon PdPtNi/C are constructed by a facile one-pot approach and are characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The electrocatalytic performance of the as-prepared catalyst for ORR is evaluated in acid electrolyte and compared with the state-of-the-art commercial Pt/C catalyst at identical condition. The icosahedral structure with 20 exposed {111} facets and twin boundaries are the distinguishing features of the PdPtNi/C nanoparticles, which enable them to be more active. The compressive strain effect and electronic interaction (ligand effect) of Pd, Pt, and Ni elements are also responsible for the excellent performance of the catalyst: the higher onset potential of ORR than that of commercial Pt/C, the outstanding specific activity and mass activity, which is about 9.59 and 5.40 times higher than those of commercial Pt/C at 0.90 V RHE , respectively, while 5.39 and 4.75 times higher at 0.85 V RHE , respectively. These results can promote the practical application of Pt-based catalyst and thus accelerate the widespread commercialization of fuel cell technologies.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 25
·12812-12818
·
IF 7.76
Zhuoqing Lin,Wenlong Chen,Ying Jiang,Ting Bian,Hui Zhang,Jianbo Wu,Yong Wang,Deren Yang
PtRu bimetallic particles are well-known commercial catalysts with promising performance for methanol oxidation. However, shape-controlled synthesis of PtRu bimetallic nanocrystals, especially for the platonic structures with {100} (e.g., cubes) or {111} facets (e.g., icosahedra) exposed towards catalysis, has met only limited success due to the different crystal structures of Pt and Ru. Here we report a facile approach to the synthesis of Ru decorated Pt bimetallic cubes and icosahedra in a mixed solvent. We found that the cubes were formed in the solvent containing N,N-dimethylmethanamide (DMF) and oleylamine (OAm) possibly due to the selective adsorption of CO on Pt{100} arising from the decomposition of DMF catalyzed by a Ru salt precursor. When hexadecane was added into the aforementioned solvent, the synthesis became a two-phase interfacial reaction due to the large difference in solvent polarity, thereby retarding the reaction kinetics and promoting the formation of the icosahedra with the composition similar to the cubes. When evaluated as catalysts towards methanol oxidation, the Ru decorated Pt icosahedra showed much better performance in terms of specific and mass activity relative to the corresponding cubes. Specifically, the Ru decorated Pt bimetallic icosahedra achieved a specific activity of 0.76 mA cm−2 and mass activity of 74.43 mA mgPt−1, which is ∼6.7 and 2.2 times as high as those of the carbon supported Pt7Ru nanoparticles, respectively. This enhancement can be attributed to a combination of twin-induced strain and facet effects.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2025
·Vol. 18
·期 6
·1279
·
IF 3.2
Zisheng Tang,Dafu Zhao,Xiaoqian Wang,Yanhui Jiao,Manrui Liu,Chengqi Liu,Qi Zhang,Shujing Ren,Yong Liu
Enhancing the limited utilization and overall yield of Pt-based catalysts is essential for advancing proton exchange membrane fuel cell technology. Herein, we report a facile one-pot method that utilizes TEG as both a solvent and a reductant to efficiently synthesize a Pd@Pt core-shell icosahedron. By controlling the surface energy between Pd and Pt precursors, we achieved the formation of Pd@Pt core-shell icosahedra, resulting in a fourfold reduction in reaction time and an eightfold increase in yield. Moreover, the core-shell structures exhibited a significant enhancement in electrocatalytic activity, stability, and Pt utilization efficiency. In comparison to commercial Pt/C, the Pd@Pt core-shell icosahedron exhibited efficient mass activity (MA, 1.54 A mg−1Pt) and specific activity (SA, 2.24 mA cm−2Pt) at 0.9 V (vs. RHE), while demonstrating excellent stability with minimal loss of activity even after 10,000 potential cycles. The Pd@Pt icosahedra configuration integrates the advantages of multiply twinned nanostructures, leading to rich electrochemical active surface sites and fast charge transport, thereby improving its catalytic performance and long-term stability during electrocatalytic reactions.
研究领域:
材料科学
·
能源化学
·
电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Viruses-Basel
·
2022
·Vol. 14
·期 11
·2431
·
IF 5.818
Jing Zheng,Wenyuan Chen,Hao Xiao,Fan Yang,Xiaowu Li,Jingdong Song,Lingpeng Cheng,Hongrong Liu
GP4, a newRalstonia solanacearumphage, is a short-tailed phage. Few structures ofRalstonia solanacearumphages have been resolved to near-atomic resolution until now. Here, we present a 3.7 Å resolution structure of the GP4 head by cryo-electron microscopy (cryo-EM). The GP4 head contains 540 copies of major capsid protein (MCP) gp2 and 540 copies of cement protein (CP) gp1 arranged in an icosahedral shell with a triangulation number T = 9. The structures of gp2 and gp1 show a canonical HK97-like fold and an Ig-like fold, respectively. The trimeric CPs stick on the surface of the head along the quasi-threefold axis of the icosahedron generating a sandwiched three-layer electrostatic complementary potential, thereby enhancing the head stability. The assembly pattern of the GP4 head provides a platform for the further exploration of the interaction betweenRalstonia solanacearumand corresponding phages.Keywords:Ralstonia solanacearumphage;icosahedral head;triangulation number T = 9;trimeric CP;Cryo-EM
研究领域:
病毒学
·
结构生物学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Wenna Wu,Ling Wang,Yitong Wang,Luxuan Guo,Shuli Dong,Jingcheng Hao
Synthetically colloidal clusters with new functions and well-controlled size distribution can in principle be constructed using colloidal particles. The building units could be integrated into dense-packed and desired structured with novel functions by means of an efficient strategy or binding patterns. Here we synthesized colloidal clusters of icosahedrons and long-range ordered face-centered cubes (FCCs) via emulsion self-assembly using fluorescence upconversion nanoparticles NaGdF 4 : Yb 3+ , Er 3+ as building blocks. The icosahedrons and FCCs structure may generate spontaneously due to an entropy-driven process. The morphology and structure of colloidal clusters have noticeable transformation from icosahedron-like symmetry to FCC symmetry with the increasing size of clusters. Furthermore, the colloidal clusters could be decorated with cationic polyethyleneimine (PEI) via electrostatic interaction . When copper ions are added, the amino groups of PEI could coordinate with Cu 2+ forming low toxic PEI-Cu 2+ layers, which can further serve as energy receptors to quench upconversion fluorescence with 980 nm laser excitation. Our results reflect that the colloidal clusters not only can serve as a fluorescence platform of detection and analysis but also may represent advancement in the field of colloidal and interface sciences .
研究领域:
胶体科学
·
界面科学
·
材料科学
·
光学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xiaoli Liang,Yinliang Yang,Chao Zou,Wei Chen,Hui-Xi Zou,Yun Yang
Penta-fold twinned (PFT) Au nanobipyramids (AuNBs) have outstanding optical properties compared with other PFT Au nanocrystals . The reproducible preparation of the seeds for synthesizing high quality of AuNBs still remains a challenging problem. In this work, we achieved the high-yield and reproducible preparation of small sized Au nanodecahedron (AuND) nanocrystals, and further used them as seeds in a controlled manner to synthesize monodispersed AuNBs and other shaped nanocrystals. The prepared AuNBs have better photothermal conversion performance than other shaped Au nanocrystals. This approach can promote the AuNB-based study and applications in optics, catalysis and therapy.
研究领域:
纳米材料学
·
光学
·
催化与治疗应用
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Guangju Zhou,Yun Yang,Shuhua Han,Wei Chen,Yunzhi Fu,Chao Zou,Lijie Zhang,Shaoming Huang
Au nanobipyramids (NBPs) are important nanostructures which attract much attention due to their unique structure, optical, and catalytic properties. The controlled synthesis of Au NBPs and corresponding mechanistic study are highly desirable for both fundamental research and practical applications. Herein, we demonstrate a strategy that large sized Au decahedra with well-defined shape act as seeds for growing NBPs. Furthermore, through using different sized decahedra seeds with edge from 25 to 49 nm, various sized NBPs can be easily prepared (longitudinal length from 110 to 210 nm; transverse length from 36 to 70 nm). Our study provides hard evidence for the growth of NBPs that they surely stem from the overgrowth on penta-twinned decahedra. Because these used large size seeds have well-defined shape and structure, the growth of the NBPs can be easily determined. Results show that the formation of NBPs is primarily determined by the molar ratio of Au3+ and Au seeds (MRAA). MRAA less than 4 only causes size enhancement and no significant shape change. In cases of MRAA higher than 4 and lower than 8, quasi-nanorods are produced. When MRAA range from 8 to 10, NBPs form and the yield is higher than 90%. The effect of reaction time and temperature also are vital to the growth of NBPs. These prepared NBPs are found to exhibit excellent surface enhanced Raman scattering (SERS) performance because of many present hotspots, edges, steps, and tips on their surfaces.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 35
·4533-4540
·
IF 3.1
Hongda Sun,Yu Tian,Jinping Wei,Wenli Wei,Zhichao Zhang,Shuang Han,Wenxin Niu
Surface-enhanced Raman scattering (SERS) has been widely used as a sensitive molecular spectroscopy technology in food safety detection. Precise morphology control of plasmonic nanoparticles for high sensitivity and high uniformity SERS substrates remains challenging. Herein, silver decahedral nanoparticles (AgDeNPs) with uniform and adjustable sizes were synthesized by a photochemical seed-mediated method and utilized as SERS substrates for pesticide residue detection. The SERS sensitivity was demonstrated by using 4-mercaptobenzoic acid (4-MBA) as a typical model molecule, and the limit of detection (LOD) reached 1.0 × 10−13 M. The pesticide residue detection of thiram in aqueous solution and on fruit peels was successfully realized; the LODs were 1.0 × 10−11 M and 0.96 ng cm−2, respectively, and SERS repeatability was also proved. Overall, size-tunable AgDeNPs show attractive SERS performances and are expected to hold potential application in sensitive food and environmental safety detection.
研究领域:
食品安全检测
·
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3565-3572
·
IF 4.58
Li Mingshi,Wang Yanying,Ye Xiaoxue,Wang Zhengguo,Wu Tsunghsueh,Li Chunya
Icosahedral gold nanocrystals (AuNCs) were synthesized by using the ionic liquid (IL) 1-(10-bromodecyl)-3-methyl-imidazolium bromide as a morphology-controlling reagent. The novel IL 1,3-di-(3-mercaptopropyl)-imidazolium bromide was employed as a bifunctional monomer to integrate the AuNCs onto the surface of a glassy carbon electrode (GCE) modified with gold nanoparticles. After interaction with thioglycolic acid (TGA) and activation of the carboxy groups, the antibody against squamous cell carcinoma antigen was immobilized on the modified GCE. Residual active sites were blocked with bovine serum albumin. The new materials and the steps for immunosensor fabrication were fully characterized. The reduction in peak current (using hexacyanoferrate as an electrochemical probe) due to the recognition of SCCA is linearly related to the SCCA concentration in the 0.02 to 10 ng mL −1 concentration range. The detection limit is as low as 12.6 pg mL −1 (at an S/N ratio of 3). The assay was applied to the quantitation of SCCA in human serum samples. The accuracy was validated by comparison with an ELISA method. The two methods displayed excellent consistency.
Icosahedral gold nanocrystals were self-assembled onto a gold nanoparticle modified glassy carbon electrode surface by using 1,3-di-(3-mercaptopropyl)-imidazolium bromide ionic liquid as a linker. Antibody for squamous cell carcinoma antigen was immobilized onto the gold nanocrystal based interface to fabricate an immunosensor.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）