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
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 2
·696-703
·
IF 11.806
Ge Ruixiang,Chen Liang
RuO 2 has been extensively investigated as a pseudocapacitive material. However, developing a facile and effective method to improve the pseudocapacitive performance of RuO 2 is still desired. In this work, we report the synthesis of ultra-small RuO 2 nanoparticles supported on carbon cloth (us-RuO 2 /CC) via a facile two-step method. As a binder-free electrode, us-RuO 2 /CC exhibits a high capacitance of 1067.4 F g −1 at a current density of 1 A g −1 . Moreover, us-RuO 2 /CC also shows good rate performance (87.8% capacitance retention at 20 A g −1 ) and cycle stability (99.6% capacitance retention after 5000 cycles). Graphical abstract Ultra-small RuO 2 nanoparticles on carbon cloth (us-RuO 2 /CC) were synthesized via annealing and acid etching treatment of a ZnRu precursor, which was prepared by a dip-coating process. Introducing Zn significantly reduces the particle size of RuO 2 , leading to a high specific capacitance of 1067.4 F g −1 .
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Small
·
2015
·Vol. 11
·期 30
·3676-3685
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IF 8.368
Fuyao Liu,Xiuxia He,Junping Zhang,Huimao Zhang,Zhenxin Wang
Hydrophobic ultrasmall nanoparticles synthesized in nonpolar solvents exhibit great potential in biomedical applications. However, a major challenge when applying these nanomaterials in biomedical research is the lack of a versatile strategy to render them water dispersible while preserving the hydrodynamic diameter (HD) to be less than 8 nm for efficient renal clearance. To address this problem, tryptone is employed as the novel ligand to fabricate a simple, versatile, and inexpensive strategy for transferring hydrophobic NaGdF 4 nanodots (3 nm in diameter) from organic phase into aqueous phase without any complicated organic synthesis. The paramagnetic properties of NaGdF 4 nanodots are well retained after the phase transfer process. In particular, the tryptone–NaGdF 4 nanodots have ultrasmall HD (ca., 7.5 nm), which greatly improves their tumor accumulation and facilitates renal clearance within 24 h postinjection. The as-prepared tryptone–NaGdF 4 nanodots can also be further functionalized with other molecules for extensively biomedical and bioanalytical applications. Furthermore, the proposed strategy can easily be extended to transfer other types of inorganic nanoparticles from hydrophobic to hydrophilic for facilitating biomedical applications.
研究领域:
材料科学
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生物医学工程
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纳米医学
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产品关联
DOI
PubMed
高影响因子
Science Advances
·
2024
·Vol. 10
·期 18
·
IF 11.7
Ji Jiang,Mingming Shi,Zhengchang Xia,Yong Cheng,Zema Chu,Wei Zhang,Jingzhen Li,Zhigang Yin,Jingbi You,Xingwang Zhang
Perovskite light-emitting diodes (PeLEDs) have attracted great attention in recent years; however, the halogen vacancy defects in perovskite notably hamper the development of high-efficiency devices. Previously, large-sized passivation agents have been usually used, while the effect of defect passivation is limited due to the weak bonding or the large space steric hindrance. Here, we predict that the ultrasmall-sized formate (Fa) and acetate (Ac) have more efficient passivation ability because of the stronger binding with the perovskite, as demonstrated by density functional theory calculation. We introduce ultrasmall-sized cesium salts (CsFa/CsAc) into buried interface, which can also diffuse into the bulk, resulting in both buried interface and bulk passivation. In addition, the improved perovskite growth has been found due to the enhanced hydrophily after introducing CsFa/CsAc as additive. According to these advantages, a pure-red PeLED with 24.2% efficiency at 639 nm has been achieved.
研究领域:
材料科学
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光电技术
✓ 已验证
DOI
高影响因子
Journal of Experimental Nanoscience
·
2016
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IF 0.832
Yao Yu,Youshen Wu,JiaJun Liu,Yonghua Zhan,Daocheng Wu
Water-dispersible ultrasmall nanogolds (WDU AuNPs) and their dopamine-coated nanogolds (WDU AuNPs@DPAs) were prepared by a reduction method with sodium borohydride as a reducing agent and a stabilised agent of 2-mercaptosuccinic acid in aqueous solution. The effects of these nanoparticles on computed tomography (CT) imaging were evaluated. The size distributions and Zeta potential of the nanoparticles were measured with a Malvern size analyser, and nanoparticle morphology was observed by transmission electron microscopy. These characteristics were confirmed by Fourier transform spectroscopy and ultraviolet/visible spectra. It was found that WDU AuNPs@DPAs were 5.4 nm in size with clear core–shell structure. The 3-(4, 5-Dimethyl-2-thiazolyl)-2, 5-diphenyltetrazolium bromide assay results showed that the WDU AuNPs and WDU AuNPs@DPAs were hypotoxic to different cells. The WDU AuNPs@DPAs showed a much longer circulation time and a larger CT attenuation coefficient than iohexol and could be excreted by the kidney and bladder. These nanoparticles showed considerable potential for future application in CT imaging.
研究领域:
医学影像学
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纳米医学
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产品关联
DOI
PubMed
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Zhuizhui Su,Bingxing Zhang,Xiuyan Cheng,Fanyu Zhang,Qiang Wan,Lifei Liu,Xiuniang Tan,Dongxing Tan,Lirong Zheng,Jianling Zhang
UiO-66-NH 2 , an important metal–organic framework, is usually synthesized by solvothermal method and the particle size is generally larger than 200 nm, which limits its catalytic applications in chemical reactions. It is very meaningful to produce UiO-66-NH 2 nanoparticles with ultra-small size, but remains challenging. Herein, we synthesized UiO-66-NH 2 nanoparticles in size of 8–15 nm that are immobilized on g-C 3 N 4 nanosheets. Compared with the UiO-66-NH 2 synthesized by the traditional solvothermal method (> 200 nm), the ultra-small UiO-66-NH 2 nanoparticles immobilized on g-C 3 N 4 have more unsaturated coordination positions and increased Lewis acidity. Owing to these combined advantages, the ultra-small UiO-66-NH 2 nanoparticles exhibit greatly improved catalytic activity for Meerwein–Ponndorf–Verley reaction than larger UiO-66-NH 2 particles.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
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
✓ 已验证
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-18
·
IF 14.7
Meng Xiangqin,Fan Huizhen,Chen Lei,He Jiuyang,Hong Chaoyi,Xie Jiaying,Hou Yinyin,Wang Kaidi,Gao Xingfa,Gao Lizeng,Yan Xiyun,Fan Kelong
Developing strategies that emulate the killing mechanism of neutrophils, which involves the enzymatic cascade of superoxide dismutase (SOD) and myeloperoxidase (MPO), shows potential as a viable approach for cancer therapy. Nonetheless, utilizing natural enzymes as therapeutics is hindered by various challenges. While nanozymes have emerged for cancer treatment, developing SOD-MPO cascade in one nanozyme remains a challenge. Here, we develop nanozymes possessing both SOD- and MPO-like activities through alloying Au and Pd, which exhibits the highest cascade activity when the ratio of Au and Pd is 1:3, attributing to the high d-band center and adsorption energy for superoxide anions, as determined through theoretical calculations. The Au 1 Pd 3 alloy nanozymes exhibit excellent tumor therapeutic performance and safety in female tumor-bearing mice, with safety attributed to their tumor-specific killing ability and renal clearance ability caused by ultrasmall size. Together, this work develops ultrasmall AuPd alloy nanozymes that mimic neutrophil enzymatic cascades for catalytic treatment of tumors.
研究领域:
生物医学工程
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肿瘤学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yang Hu,Zixuan Li,Yan Sun
Enzymes that can convert chemical energy into mechanical force through biocatalysis have been used as engines for artificial micro/nanomotors. However, most nanomotors are powered by only one engine and have a microscale size range, which greatly limits their application scenarios. Herein, an ultrasmall enzyme/light-powered nanomotor (71.1 ± 8.2 nm) is prepared by directly coupling ultrasmall histidine-modified Fe 3 O 4 nanoparticles (UHFe 3 O 4 NPs, 2.71 ± 0.54 nm) with cholesterol oxidase (ChOx) for cholesterol detection. The chemical engine, ChOx , catalyzes the oxidation of cholesterol to actuate UHFe 3 O 4 @ChOx and produce H 2 O 2 . Meanwhile, UHFe 3 O 4 NPs that possess peroxidase-mimicking property and photothermal effect act as a nanozyme to catalyze the subsequent chromogenic reaction between H 2 O 2 and 3,3′,5,5′-tetramethylbenzidine for cholesterol detection and simultaneously serve as a photothermal engine power by near-infrared (NIR) irradiation. The nanomotor behavior of UHFe 3 O 4 @ChOx results in an enhancement (55%) of ChOx catalytic efficiency. Moreover, due to the outstanding peroxidase-mimicking activity and cascade reaction, UHFe 3 O 4 @ChOx works as a cholesterol sensor with improved sensitivity and shortened analysis time; as low as 0.178 μM of cholesterol is detected with a linear response range of 2 to 100 μM. Taken together, the new conceptual synthetic strategy of enzymatic hybrid nanomotor is proven promising for sensing and biocatalytic applications.
研究领域:
生物化学
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纳米医学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Xintong Li,Zhichuan Yang,Xin Zhao,Min Gao,Yu Liu
The use of high-surface-area materials in loading α-Fe 2 O 3 nanoparticles presents an intriguing approach to improve the electrocatalytic efficiency of overall water splitting. Nevertheless, the effective management of α-Fe 2 O 3 nanoparticle size to prevent their agglomeration continues to pose a significant challenge. This study used bio-based porous carbon with a specific surface area of 2876 m 2 /g and a mesoporous ratio of 95 % as a carrier to effectively disperse and inhibit the growth of α-Fe 2 O 3 nanoparticles. The Fe 2 O 3 /NSC -30 was synthesized using urea as a precipitant through an ethylene glycol-assisted hydrothermal method accompanied by high-temperature calcination, with the α-Fe 2 O 3 nanoparticle size being approximately 5.5 nm. The synergistic effect between the ultra-small nanoparticles and the mesoporous structure facilitates the effective diffusion of electrolyte and exposes more catalytic active sites. The Fe 2 O 3 /NSC -30 exhibited remarkable catalytic performance in the OER and HER, as evidenced by the respective low overpotentials of 270 mV and 250 mV at 20 mA cm −2 . Furthermore, when Fe 2 O 3 /NSC -30 was utilized in the overall water-splitting reaction, a low cell voltage of 1.70 V was sufficient to achieve a current density of 20 mA cm −2 . In this study, a new method was proposed for loading ultra-small nanoparticles onto bio-derived mesoporous carbon for promoting overall water splitting with remarkable efficiency.
研究领域:
材料科学
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电化学
·
纳米技术
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产品关联
DOI
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
✓ 已验证
DOI
高影响因子
Small Methods
·
2024
·
IF 10.7
Yifan Dai,Jie Ju,Liling Luo,Hao Jiang,Yanjie Hu,Chunzhong Li
The synthesis of high-entropy alloys (HEAs) with ultra-small particle sizes has long been a challenging task. The complex and time-consuming synthesis process hinders their practical application and widespread adoption. This study presents the novel synthesis of TiO 2 nanoparticles loaded with a quinary high-entropy alloy through flame spray pyrolysis (FSP) for the first time. The extremely fast heating rate of flame combustion makes the precursor fast pyrolysis gasification, high temperature in the flame field promotes the metal vapor mixing uniformly, and the fast quenching process can reduce the particle aggregation sintering, the ultra-small particle size of HEA firmly attached to the TiO 2 surface. The catalysts prepared via this gas-to-particle pathway exhibit excellent performance in CO 2 hydrogenation, achieving a conversion rate of 62% at 450 °C, and maintaining their activity for over 220 h without significant particle agglomeration. This finding provides valuable insights for the future design of catalytically active materials with enhanced activity and long-term stability.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
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