ACS Applied Materials & Interfaces
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2021
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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
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催化化学
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DOI
PubMed
高影响因子
TALANTA
·
2022
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IF 6.556
Yujie Yu,Min Qing,Yidan Ma,Yan Zhang,Shuting Zheng,Chao Yu,Junlin He
Lead ion (Pb 2+ ) is a major non-degradable environmental pollutant and poses threat to human health. DNAzymes have proved to be a promising tool for the detection of extracellular metal ions . Owing to cellular uptake, enzymatic degradation and reliable signal output, using DNAzymes to quantitative intracellular sensing of Pb 2+ still presents challenges. In this study, we report a core-shell nanoworms-DNAzyme nanoprobe combing hairpin-like DNAzyme (H DNAzyme) with polydopamine-coated Au cores plasmonic “nanoworms” ( [email protected] NWs) for imaging of Pb 2+ in living cells. PDA with good biocompatibility, high near-infrared (NIR) fluorescence quenching efficiency, and provides a larger surface for further functionalization of biomolecules. H DNAzyme can loaded onto [email protected] NWs via coordination interaction and π–π stacking, resulting in significant quenching of their fluorescence by PDA shells and Au cores. In the presence of target Pb 2+ , the H DNAzyme are activated and release Cy5 fluorophore-labeled short strands from [email protected] NWs. Therefore, an increased fluorescence signal is observed and allows imaging of Pb 2+ in living cells. Moreover, the highly selective of H DNAzyme make the proposed method effectively discriminate against other nonspecific molecules. The [email protected] NWs-H DNAzyme nanoprobe shows good biocompatibility and obviously decreased background fluorescence, which can monitor Pb 2+ levels and biodistribution. The developed nanoprobe holds great potential for further extend to bioimaging of other metal ions.
研究领域:
生物化学
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环境科学
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纳米技术
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分子生物学
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2016
·Vol. 18
·期 11
·7820-7828
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IF 4.449
Xiao Sun,Chuanjie Cai,Qian Wang,Dongqing Cai,Junchao Qian,Yu Chi,Kang Zheng,Xin Zhang,Guilong Zhang,Kai Zhong,Zhengyan Wu
A wormstructured and nanosized porous/hollow polyethyleneimine (PEI) functionalized Gd2O3/Fe3O4 composite was fabricated as a drug carrier and a bioimaging agent. The effect of PEI's chain length on the size and morphology of the nanoworm was investigated and the results indicated that the nanoworm modified with PEI (10 000 molecular weight) (designated as p-nanoworm) possessed a suitable size and a porous/hollow structure. Meanwhile, the p-nanoworm could effectively prevent the leakage of Gd ions under different pH conditions because of plenty of amino groups on their surface. Compared with contrast agents of clinical use, the p-nanoworm displayed MR enhancement with a high r1 relaxivity of 5.58 s−1 mM−1 per gadolinium atom. Cisplatin (CDDP), a clinical anticancer drug, could be easily loaded into the pores and lumen of the p-nanoworm (p-nanoworm-CDDP) and also controllably released by adjusting the pH value. Cell assay suggested that the p-nanoworm possessed satisfactory biocompatibility and meanwhile could promote CDDP uptake of HeLa cells and enhance the inhibition effect on HeLa cells. In addition, p-nanoworm-CDDP showed a negligible cytotoxicity on normal human cells, indicating that the side effect of CDDP is reduced. Thus, the p-nanoworm could have a potential application for the diagnosis and therapy of cancer.
研究领域:
医学
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Cuizhen Yang,Quanguo Jiang,Huajie Huang,Haiyan He,Lu Yang,Weihua Li
Direct methanol fuel cells with high energy conversion efficiency and low hazard emissions have aroused great attention from both academic and industrial communities, but their large-scale commercial application has been blocked by high costs as well as short lifespan of the anode Pt catalysts. Here, we demonstrate a simple and scalable noncovalent strategy for the synthesis of quasi-one-dimensional (1D) Pt nanoworms grown on poly(diallyldimethyl-ammonium chloride) (PDDA)-functionalized Ti3C2Tx nanosheets as anode catalysts for methanol electrooxidation. Interestingly, the introduction of PDDA on Ti3C2Tx nanosheets can not only effectively adjust their surface charge property to strengthen the electrostatic interaction between metal and support but also induce the stereoassembly of worm-shaped Pt nanocrystals with abundant catalytically active grain boundaries, which enable the resulting hybrid to express high electrocatalytic activity, remarkable durability, and strong antipoisoning ability for methanol electrooxidation, which are better than those of the traditional Pt nanoparticle electrocatalysts loaded on carbon black, carbon nanotubes, reduced graphene oxide, and MXene matrixes. Theoretical simulations disclose that the more stable worm-shaped Pt configuration with an optimized electronic structure on the Ti3C2Tx surface possesses a weaker CO adsorption ability than that of the Pt nanoclusters, thereby providing a dramatically enhanced and sustainable electrocatalytic performance.
研究领域:
材料科学
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电化学
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纳米技术
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DOI
PubMed
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Yi-Ye Liu,Yong-Hao Xiao,Wei-De Zhang
A nanoworm BiVO 4 photoanode was successfully synthesized by sol-gel drop-casting for the determination of ascorbic acid. The structure and surface morphology of the obtained samples were characterized, and their photoelectrochemical properties and sensing performance towards ascorbic acid were investigated. The precursor solids were also investigated, and the results proved that cyanuric chloride, which was bound with other precursors, generated the nanoworm morphology. The nanoworm BiVO 4 photoanode enhanced the photocurrent density and exhibited a sensitivity of 68.9 μA mM -1 cm -2 towards ascorbic acid with high selectivity under visible light illumination.
研究领域:
分析化学
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材料科学
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纳米生物技术
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光电化学
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生物传感器
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环境监测
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转化医学
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DOI
高影响因子
危险品化学品经营许可证（带存储）