ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Caihong Fang,Xiaomin Jiang,Jinwu Hu,Jiaojiao Song,Na Sun,Deliang Zhang,Long Kuai
Ruthenium nanocrystals with small size and special morphology are of great interest in various catalytic reactions due to their high activities. However, it is still a great challenge to downsize these nanocatalysts to a sub-nano scale (<2 nm). Herein, we reported a synthesis of ultrasmall size and uniform Ru nanoparticles through a rapid one-pot method. The prepared Ru nanocrystal shows a wormlike shape, in which the diameter is as thin as 1.6 ± 0.3 nm and the length is 13.6 ± 4.4 nm. These Ru nanoworms (NWs) are quite steady during the synthetic process even though the reaction time was further prolonged. We also examined their catalytic activity toward CO oxidation by loading Ru NWs on TiO2 to form Ru NWs/TiO2 catalysts. These catalysts exhibit a high activity of 100% CO conversion at 150 °C, which is much lower than the normal Ru NPs/TiO2 nanostructures. Based on our detailed investigations, we proposed that the small size, special morphology, and TiO2 support are the keys for their significantly improved catalytic activity. We believed that these reasonable discoveries provide a methodology and opportunity to get highly active catalysts for CO oxidation by a detailed increase in their active sites.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 29
·3586-3591
·
IF 3.1
Li Zhang,Jiyan Huang,Mixue Chen,Hongmei Huang,Yi Xiao,Ronghua Yang,Youyu Zhang,Xiaoxiao He,Kemin Wang
Amphiphilic aggregation-induced emission (AIE) molecules show superior potential for fabricating novel ultrasmall nanoprobes. Here, an anionic dipyridyl tetraphenylethene (TPE) derivative is rationally designed and a super-small self-assembled AIEgen nanoprobe (TPE-2Py-SO3NaNPs, ca. 2.48 nm) is thus conveniently constructed for the supersensitive detection of protamine and trypsin. In HEPES/DMSO solution (8 : 2, v/v, pH = 7.4), negatively charged TPE-2Py-SO3NaNPs exhibited an AIE effect in the presence of positively charged protamine, presenting a fluorescence enhancement at 498 nm together with a large Stokes shift of 150 nm and a low detection limit of 8.0 ng mL−1. In addition, the in situ formed TPE-2Py-SO3Na/protamine nanocomposite can be dissociated by trypsin due to the highly selective degradation of protamine via enzymatic hydrolysis, achieving a detection limit for trypsin as low as 5.0 ng mL−1.
研究领域:
生物化学
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分析化学
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医学检测
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 1
·520-526
·
IF 3.201
Linxu Xu,Jiajia Zhang,Zhenhui Li,Qinghai Ma,Yan Wang,Fang Cui,Tieyu Cui
CuO nanoparticles (CuO NPs) with ultrasmall size (∼3.6 nm) and a highly-dispersed pattern embedded in a silica matrix were obtained in situ through a calcination process of organic copper salt. By means of rational selection of reactants, organic copper salt was introduced into Si–O–Si networks via covalent bonding during the sol–gel process under neutral conditions without any additional catalyst. The introduction of organic copper salt via covalent bonding as well as the compact Si–O–Si networks allowed for the formation of highly dispersed and ultrasmall sized CuO NPs. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that the obtained silica complex had spherical morphology and well-dispersed small sized CuO NPs. The as-obtained CuO@SiO2 nanocomposites exhibited good catalytic property on the reduction of organic dye with NaBH4 as the reducing agent.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2024
·Vol. 26
·期 6
·1-13
·
IF 2.1
Wang Xin-Yu,Chen Yan-Ming,Nie Xiao-Bo,Zhang Li-Li
Copper oxide nanoparticles (CuO NPs) are attractive owing to their size- and shape-dependent properties, as well as their diverse applications. Therefore, the synthesis of environmentally friendly CuO NPs using low-toxicity reagents remains significant. In this study, a benign wet-chemical process was applied to synthesize CuO NPs in an alcohol-water mixture, employing copper acetate as the precursor and sodium oleate as the surfactant. Multiple experimental parameters, including water content, the molar ratio of sodium oleate to copper acetate, types of alcohols, and reaction temperature, were investigated to examine their effects on the formation and structures of the resulting products. Results from X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the monoclinic crystalline structure of CuO NPs with an ultra-small size of less than 3 nm. The size of CuO NPs can be easily adjusted by altering the water content, the molar ratio of precursor to surfactant, and other factors. The as-synthesized CuO NPs exhibited significantly enhanced antibacterial activity against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ).
研究领域:
材料科学
·
微生物学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Cong Dai,Hai-Long Qian,Xiu-Ping Yan
Facile synthesis of nano porous organic cages with small size and good fluorescence property is highly desirable, but still challenging and scarce for their sensing applications. Here we report a rapid room-temperature recrystallization method for the preparation of nano porous organic cages with ultra-small size as a fluorescent probe for copper ion . The prepared nano porous organic cages gave the diameter of 2.49 ± 0.04 nm, and exhibited stable emission at 535 nm with absolute quantum yield of 0.68%. On the basis of the coordination interaction and charge transfer between the nano porous organic cages and copper ion , a simple fluorescent probe for copper ion in aqueous solution was developed. The developed method gave a calibration function of QE = 0.4815lg[Cu 2+ ] + 0.5847 (where QE is the quenching efficiency; [Cu 2+ ] in μM) (R 2 = 0.9987) in a concentration range of 0.1–2 μM, the limit of detection (3 s ) of 8 nM, and the relative standard deviation of 0.36% for 10 replicate determinations of 0.5 μM copper ion. The recoveries of spiked copper ion in tap water samples ranged from 96.8% to 103.0%. The proposed method possesses good sensitivity, selectivity and accuracy.
研究领域:
化学
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分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2022
·Vol. 35
·期 1
·e202200158
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IF 3.077
Liangyin Zhou,Hongji Li,Dandan Wang,Wei Jiang,Yuanyuan Wu,Liaofang Shang,Chunyi Guo,Chunbo Liu,Baixiang Ren
Zeolitic Imidazolate Frameworks (ZIFs) are considered as a novel porous material combining high stability in inorganic zeolites with high porosity and organic functionality of MOFs. The cage-like structure selectively and efficiently traps CO 2 , which is an indispensable and critical step for Electrocatalytic CO 2 Reduction Reaction (CO 2 RR). In this work, ultrasmall ZIF-8 nanomaterials are synthesized by tuning the molar ratio of the feedstock and used as electrocatalysts for the selective reduction of CO 2 to CO. The catalytic activity of the ultra-small size ZIF-8 material for the electrocatalytic reduction of CO 2 can reach satisfactory results with a Faraday efficiency of 91 % for CO and a stability of 12.5 h at a high applied potential of −1.8 V vs. RHE. The investigation can provide a new idea to explore for the design and improvement of catalysts for CO 2 RR.
研究领域:
材料科学
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电化学
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环境科学
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产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·1269-1275
·
IF 8.897
Che Zhiwen,Lu Xuyun,Cai Bingfeng,Xu Xiangxing,Bao Jianchun,Liu Ying
Ultra-small size metal nanoparticles (u-MNPs) have broad applications in the fields of catalysis, biomedicine and energy conversion. Herein, by means of a ligand-controlled synthesis strategy, series of Ru-based NPs with high dispersity and ultra-small size (marked as u-Ru/C), or sparse and aggregated state (marked as a-Ru/C) anchored on the surface of hollow porous carbon shells are prepared. Systematical in-situ thermogravimetry-mass spectrometry-Fourier transform infrared spectra tests suggest that the different ligands in these Ru-based precursors can regulate the nucleation, growth and fixation of metal sites during the pyrolysis process, thus contributing to Ru NPs with various size and dispersity. As a result, when applied to hydrogen evolution reaction, the u-Ru-1/C catalyst displays a low Tafel slope of 26 mV·dec −1 , overpotential of 31 mV (at 10 mA·cm −2 ) and a large exchange current density of 1.7 mA·cm −2 in 1.0 M KOH, significantly better than that of the a-Ru-2/C, hollow carbon and even commercial 20% Pt/C. This is mainly because that the u-Ru-1/C sample owns both smaller particle size, more electrochemical active sites, higher intrinsic activity and optimized surface H adsorption ability than that of the a-Ru-2/C counterpart. Such ligand-modulated growth strategy is not only applicable to Ru, but also can be extended to other similar metals, offering a step forward in the design and synthesis of highly dispersed u-MNPs.
研究领域:
材料科学
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电化学
·
能源转换
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产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 18
·9798-9804
·
IF 7.76
Junpeng Shi,Xia Sun,Jianfei Zhu,Jinlei Li,Hongwu Zhang
Near infrared (NIR)-emitting persistent luminescent nanoparticles (NPLNPs) have attracted much attention in bioimaging because they can provide long-term in vivo imaging with a high signal-to-noise ratio (SNR). However, conventional NPLNPs with large particle sizes that lack modifiable surface groups suffer from many serious limitations in bioimaging. Herein, we report a one-step synthesis of amino-functionalized ZnGa2O4:Cr,Eu nanoparticles (ZGO) that have an ultrasmall size, where ethylenediamine served as the reactant to fabricate the ZGO as well as the surfactant ligand to control the nanocrystal size and form surface amino groups. The ZGO exhibited a narrow particle size distribution, a bright NIR emission and a long afterglow luminescence. In addition, due to the excellent conjugation ability of the surface amino groups, the ZGO can be easily conjugated with many bio-functional molecules, which has been successfully utilized to realize in vitro and in vivo imaging. More importantly, the ZGO achieved re-excitation imaging using 650 nm and 808 nm NIR light in situ, which is advantageous for long-term and higher SNR bioimaging.
研究领域:
材料科学
·
生物医学工程
·
光学成像
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Zhiguo Qin,Bo Chen,Yu Mao,Chu Shi,Yan Li,Xiao Huang,Fang Yang,Ning Gu
Prussian blue nanoparticles (PBNPs), which belong to the iron-based metal–organic frameworks, are important biomedical agents. Reducing the size of PBNPs can bring improved functional properties, but unfortunately, has been a long-standing challenge. Herein, sub-5 nm ultrasmall PBNPs (USPBNPs) were successfully synthesized by using ethanol/water mixture as the solvent and polyvinyl pyrrolidone (PVP) as the surface capping agent. Adjusting the ethanol/water ratio is not only able to control the nucleation time and size of PBNPs but also tune the conformation of PVP molecules so as to prevent interparticle attachment and enlargement. At an ethanol/water ratio of 3:1, highly stable USPBNPs with a size of ∼3.4 nm were synthesized. Due to their large specific surface area, they demonstrated high peroxidase-like and catalase-like activities, which outperform PBNPs synthesized by a conventional method. In addition, they also showed a high longitudinal relaxation rate (r1) of 1.3 mM–1 S–1, suggesting their potential to be used as T1 MRI agent.
研究领域:
生物医学工程
·
纳米医学
·
材料科学
✓ 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）