REVIEW OF SCIENTIFIC INSTRUMENTS
·
2016
·Vol. 87
·期 4
·
IF 1.336
Palmer R. E.,Cao L.,Yin F.
We introduce a new type of cluster beam source based on the assembly of (metal) clusters within a condensed (rare gas) matrix. The “Matrix Assembly Cluster Source” employs an ion beam to enhance collisions between metal atoms in the matrix and to sputter out clusters to form a beam. We demonstrate the formation and deposition of gold and silver nanoclusters with mean size tunable from a few atoms to a few thousand atoms. The cluster flux is equivalent to a current nanoAmp regime but potentially scalable to milliAmps, which would open up a number of interesting experiments and applications.
研究领域:
物理学
·
材料科学
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DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xiuhua Yang,Shuhong Xiang,Zhenyu Li,Jiahao Zhou,Boxiang Wang,Hong Chen,Ming Xiao
Disordered structures with short-range correlation exhibit unique photonic or thermal properties, often arising from the self-assembly of monodisperse microspheres. Colloidal clusters, aggregates of a defined number of microspheres, have anisotropic shapes and offer a unique approach to tailor the short-range correlation compared to traditional isotropic microspheres. However, this potential remains largely unexplored. To this end, we have prepared triangular and tetrahedral colloidal clusters and coassemble them with polystyrene microspheres into both monolayers and thick films (∼10 μm) over 5 mm × 5 mm areas. Through combining scanning electron microscopy images and laser scattering measurements, we show that increasing cluster concentration from 0% to 40% increases disorder in both thin and thick films. Beyond 40%, the short-range order in thin films plateaus, while it increases with triangular clusters but decreases with tetrahedral clusters in thick films. The distinct roles of triangular and tetrahedral clusters offer new insights into design of correlated disordered materials for novel applications.
研究领域:
材料科学
·
光学
·
热学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 9
·2466-2473
·
IF 5.256
Shaochen Zhou,Mei Zhang,Fangyuan Yang,Fu Wang,Chuanyi Wang
A facile and green synthetic route is developed to prepare water soluble, green-fluorescent Pt, Au, Ag and Cu quantum clusters (QCs), employing innoxious L-histidine as a capping agent. These metal QCs give out emissions at 455–495 nm, with maximum excitation wavelengths ranging between 350 and 401 nm. Interestingly, these histidine-stabilized metal quantum clusters also possess non-linear optical properties like two-photon luminescence, which is detected when they are exposed to a femtosecond laser at 812 nm. Luminescence quantum yields of Pt (2.93%), Au (13.10%), Ag (6.97%) and Cu (8.29%) clusters are found to be distinctly different, and lifetime measurement results suggest that the emissions of metal clusters (4.59–7.39 ns) stem from singlet transitions among different electron energy levels rather than metal–ligand electron transfer behaviors. The Pt, Au, Ag and Cu quantum clusters have average sizes of 1.3–1.9 nm, and are mainly composed of 11, 9, 4 and 7 metal atoms, respectively, according to the electrospray ionization mass spectrometry results. Moreover, the as-prepared metal clusters are sensitive to aqueous ferric ions, both as highly selective fluorescent and colorimetric probes in a low and wide concentration range, and are promising in many biological applications.
研究领域:
化学
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材料科学
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分析化学
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生物医学
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产品关联
DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Shemsu Ligani Fereja,Ping Li,Jinhan Guo,Zhongying Fang,Ziwei Zhang,Zhihua Zhuang,Xiaohui Zhang,Kaifan Liu,Wei Chen
Folic acid (FA) is the natural form of water-soluble vitamins widely found in most plants and animal products and its deficiency leads to several human body abnormalities. The advancements of metal nanoclusters are highly increasing due to their molecule-like optical properties and attractive applications. Because of increasingly demand of noble metal nanoclusters as sensing templates, different synthesis methods have been developed for facile synthesis of noble metal nanoclusters . Herein, red-emitting fluorescent bovine serum albumin (BSA)-capped Au–Ag bimetallic NCs are facilely synthesized through green one-pot synthetic approach. The effect of silver on the fluorescence properties of Au NCs was investigated and it was found that introduction of silver can enhance the fluorescence intensity . The fluorescence intensity of the as-prepared Au–Ag nanoclusters gets quenched in the presence of folic acid in an aqueous medium and it was used as ultrasensitive sensing probe for FA detection. The developed Au–Ag NCs-based sensing probe shows linear response in the wide range of 0–100 μM and the detection limit is as low as 0.47 nM. Its applicability has also been confirmed successfully in real human serum, urine and FA tablet samples. Due to the high stability, sensitivity and selectivity , the developed bimetallic cluster sensing system is highly promising to be applied in the pharmaceutical and clinical laboratories.
研究领域:
生物化学
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分析化学
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医学诊断
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-8
·
IF 5.479
Mao Anqi,Wei Chunying
DNA-templated silver nanoclusters (DNA-Ag NCs) with cytosine (C)-rich sequences (four or more segments of consecutive (2–5) C-bases) were synthesized. They display green and/or orange/red emissions under different excitation wavelengths. There is indication that more consecutive C-bases lead to longer emission wavelengths. The ratio of the red and green emissions of the DNA-Ag NCs depends on whether the NCs were synthesized under acidic or basic conditions. We also prepared the DNA copper/silver nanoclusters (DNA-Cu/Ag NCs) which can be synthesized in shorter time and display higher stability. The DNA-Cu/Ag NCs, under 470 nm photoexcitation, always display green emission, with a peak at 550 nm, irrespective of whether being prepared under acidic or basic conditions. The fluorescence of the Cu/Ag NCs is selectively quenched by Hg(II) ions which can be quantified by this nanoprobe with a detection limit as low as 2.4 nM. The quenching mechanism was studied by Stern-Volmer plots and lifetime studies which revealed that both static and dynamic quenching are operative.
Schematic presentation of fluorescent DNA-Ag nanoclusters (NCs) exhibiting red and green emission under different pH values, and green emissive DNA-Cu/Ag NCs for sensitive and rapid detection of Hg 2+ .
研究领域:
生物化学
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分析化学
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纳米科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Hong Huang,Hua Li,Jiu-Ju Feng,Ai-Jun Wang
Herein, we demonstrate a facile, straightforward and green method for synthesis of highly red-emitting fluorescent bimetallic Au/Ag nanoclusters (NCs) employing lipoic acid as both a reducing agent and a protecting agent. The as-prepared Au/Ag NCs exhibited bright red emission with a strong peak centered at 630 nm (quantum yield measured as 6.4%), and showed excellent stability and remarkable temperature-dependent fluorescent property. The fluorescence responses were reversible and linear to the environment temperature from 20 to 65 °C with a resolution as high as 1.34 °C, which allows its potential application as a fluorescent nanothermometer. Moreover, Au/Ag NCs were also explored for selective and sensitive determination of Fe 3+ based on the specific quenching of the fluorescence by Fe 3+ , and explored for fluorescence imaging Fe 3+ in living HeLa cells thanks to their very low cytotoxicity.
研究领域:
材料科学
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 18
·4722-4731
·
IF 7.779
Zixuan Huang,Lin Zhang,Jiayou Hou,Tengjiao Xu,Bowen Song,Xi Bai,Hai Fu,Peipei Guo
It is highly desirable yet challenging to incorporate open micropores with mass transportation and open active metal sites into metal–organic frameworks (MOFs) for developing novel highly efficient catalysts. Herein, we report a catalyst of low-nuclearity copper-cluster-based micropore MOF, namely H-1e, incorporated with unsaturated Cu(II) centres as open active sites obtained via a highly efficient electrochemical synthesis within 20 minutes. The catalyst H-1e shows potential porosity with 1D open functionalized hexagonal channels for size-selective air oxidation as well as high stability. The electrochemically prepared H-1e exhibits excellent catalytic aerobic oxidation activity for the conversion of alcohols (mini-size) to aldehydes with over 99% selectivity and 99% yield under air conditions, showing excellent reusability and stability. The selective catalytic performances are found to be closely dependent on the suitable aperture size of the 1D channels in H-1e, which provided better beds for the oxidation transformations (confirmed by the computational DFT study). In this study, it offers a simple and potential strategy to construct microporous materials with open active metal sites to promote the catalytic efficiency of MOFs by electrochemical synthesis.
研究领域:
材料科学
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催化化学
·
电化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Jing-Yu Sun,De-Sheng Wei,Bao-Xu Jiang,Xiaohong Li,Yu-Teng Zhang,Haihui Yu,Shuaibing Ma,Shuangbao Li
We present two bimetallic architectures cooperatively assembled from trinuclear zirconocene units (Cp3Zr3, Cp = η5-C5H5) and redox-active ferrocene-based ligands (ferrocene carboxylic acid (HFcA) or 1,1-ferrocene dicarboxylic acid (H2FcDA)). Interestingly, single-crystal analysis revealed that Cp3Zr3 units exhibited diverse coordination behaviors upon combination with ferrocene derivatives, ultimately leading to two heterometallic clusters: {Zr3Fc3} with a metallocavitand structure and {Zr12Fc4} with a molecular ring architecture. Notably, the incorporation of ferrocene units provides a photosensitizing center, enabling excellent photocatalytic Fenton-like degradation of methylene blue with efficiencies of 88.86% {Zr3Fc3} and 99.85% {Zr12Fc4}. Furthermore, the DFT calculation results suggest that the HOMO → LUMO transition mainly involves metal-to-core charge transfer (MCCT) from the iron center of the ferrocenyl groups to the Zr-oxo cluster core. This work not only advances the structural diversity of ferrocene-functionalized zirconium-oxo clusters but also offers valuable insights into high-performance Fenton-like photocatalysts.
研究领域:
无机化学
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材料化学
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光催化
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配位化学
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环境催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Menglei Sun,Yidan Liang,Shiyao Sun,Haifeng Ji,Xudong Yang
In the last decade, nanoclusters and carbon dots have been a promising class of nanomaterials with a wide range of potential applications in different industrial fields, through their favorable fluorescence properties for a variety of applications, especially in temperature detection and metal ion detection. In this study, sensitive detection of Hg 2+ and temperature was achieved by metal nanoclusters and carbon dots. Well-stabilized red fluorescent gold nanoclusters (AuNCs) were successfully prepared using a one-pot hydrothermal method, and Hg 2+ ions strongly quenched the fluorescence emission of AuNCs. Subsequently, we used this finding to develop a fluorescent nanoprobe for Hg 2+ detection, in which the fluorescence color of AuNCs transitions from red to blue as the concentration of Hg 2+ increases, thus providing a promising avenue for the detection of Hg 2+ in real environmental water samples. Simultaneously, CDs/AuNCs fluorescent nanocomposites are synthesized using a dehydration condensation process between CDs and AuNCs. It is noteworthy that the red fluorescence emission is significantly sensitive to temperature changes. With the gradual increase in temperature, the fluorescence color of CDs/AuNCs nanocomposites gradually changes from pink-purple to blue, making it a promising nanothermometer. In summary, we prepared a novel fluorescent probe for Hg 2+ and temperature detection.
研究领域:
纳米技术
·
环境监测
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分析化学
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材料科学
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荧光光谱学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Jinsong Chai,Ying Lv,Sha Yang,Yongbo Song,Xiaofeng Zan,Qinzhen Li,Haizhu Yu,Mingzai Wu,Manzhou Zhu
In this work, we report the synthesis and crystal structure of Au38–xCux(2,4-DMBT)24 (x = 0–6, 2,4-DMBTH = 2,4-dimethylbenzenethiol) alloy nanocluster for the first time. A variety of characterizations including ESI-MS, TGA, and XPS reveal the composition as Au38–xCux(2,4-DMBT)24 (x = 0–6). The single crystal structure has been determined by an X-ray single crystal diffractometer. From the anatomy of the structure, a bi-icosahedral Au23 core is protected by six dimeric [−SR–M–SR–M–SR−] units (M = Cu/Au) and three monomeric [−SR–Au–SR−] units. It is interesting that all the Cu atoms are selectively doped in the motifs of the Au38–xCux(2,4-DMBT)24 nanocluster. This phenomenon is distinct from the exclusive core doping of the Ag atoms in the previously reported Au38–xAgx alloy. Both the experimental results and DFT calculations of UV–vis spectra imply that the optical property of the Au38–xCux(2,4-DMBT)24 nanocluster is consistent with that of the Au38(2,4-DMBT)24 nanocluster, because the Cu dopants make little contribution to the frontier orbitals of the alloy NC.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Siqi Lu,Zixiang Zhao,Jinsen Han,Jun Wang,Yongxin Zhang,Yu Du,Fangyu Guo,Zhichao Wang,Shenghui Wang,Sichen Tang,Kuojuei Hu,Jianguo Wan,Jiayu Dai,Fengqi Song
Size-selected gas-phase aggregated metal clusters have long been considered as embryos of materials. However, a significant proportion of these clusters are susceptive to damage when exiting vacuum. Consequently, effective protection is highly desirable. Here a cluster packaging and protection strategy is presented based on controllable cluster beam implantation into polymethyl methacrylate (PMMA). In this strategy, the size selection of gas-phase clusters and the synergistic heating of PMMA during implantation are combined, thereby achieving nondestructive packaging of atomically precise cluster under soft-landing conditions. The packaged clusters exhibit robust and universal protection. Robustness is reflected in the unaltered oxidation resistance of Mo clusters after exposure to air for over 30 days, as well as the effective agglomeration resistance at temperatures up to 100 °C or in liquid. Universality is demonstrated by the successful protection of a wide range of size-selected clusters, including Mo clusters ranging from Mo 2057 to Mo 6 , and Ta 2057 , Cu 923 , W 55 , (Re–Mo) 147 clusters. This protection is attributed to both a stable, albeit weak PMMA-Mo bonding, forming Mo─O─C─C species that stabilize the clusters, and the direct implantation of gas-phase cluster into solid-phase PMMA. This helps pave the way for further investigation and applications of gas-phase metal clusters.
研究领域:
材料科学
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 37
·12931-12943
·
IF 4.39
Wen-Min Wang,Zhi-Lei Wu,Jian-Zhong Cui
A series of tetranuclear lanthanide-based clusters [Ln4(dbm)6(L)2(CH3OH)4]·2CH3OH (Ln(III) = Gd (1), Dy (2), and Ho (3); H3L = 2-[(2-(hydroxyimino)propanehydrazide)methyl]-2,3-dihydroxybenzaldehyde, Hdbm = dibenzoylmethane) and octanuclear lanthanide-based clusters [Ln8(HL)10(CH3O)4(CH3OH)2]·6CH3OH (Ln(III) = Gd (4), Dy (5)) were assembled using a polydentate Schiff-base ligand H3L and two different β-diketone salts via a solvothermal method, and their structures and magnetic properties have been characterized. Interestingly, β-diketones play an important role in assembling and affecting the structures of Ln4 to Ln8 clusters. This is the first use of β-diketone to affect the structures of polynuclear Ln(III)-based clusters from linear-shaped Ln4 clusters to Ln8 clusters. Magnetic studies revealed that antiferromagnetic interactions exist in clusters 1-Gd4 and 4-Gd8. More importantly, clusters 1-Gd4 and 4-Gd8 display significant cryogenic magnetic refrigeration properties (−ΔSm = 24.88 J kg−1 K−1 for 1-Gd4 and −ΔSm = 32.52 J kg−1 K−1 for 4-Gd8); the results show that cluster 4-Gd8 exhibits a larger magnetocaloric effect than 1-Gd4. Cluster 2-Dy4 shows remarkable single-molecule magnet (SMM) behavior (ΔE/kB = 67.5 K and τ0 = 3.06 × 10−7 s) under a zero dc field, and 5-Dy8 exhibits a field-induced SMM-like behavior (ΔE/kB = 39.83 K and τ0 = 2.12 × 10−7 s) under a 5000 Oe dc field.
研究领域:
无机化学
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材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）