SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Rongrong Jin,Yueru Jiang,Liupeng Zhao,Tianshuang Wang,Xiaomin Liu,Fangmeng Liu,Xu Yan,Peng Sun,Geyu Lu
In this paper, we successfully prepared Ru-doped Co 3 O 4 flower-like hollow microspheres by a simple hydrothermal method . The microstructure characterization results indicated the formation of well-organized microflowers with a size of 0.5–1 µm, which were composed of nanosheets . The gas sensing performances of sensors by using the synthesized Ru-doped Co 3 O 4 hollow microflowers as sensing material were investigated. The 1 at% Ru-doped Co 3 O 4 sensor showed the best acetone sensing performance and had a response 18.8–10 ppm acetone, which was almost 5.4 times that of pure Co 3 O 4 . Significantly, the sensor had an ultra-low detection limit, with a response value of 1.5–50 ppb acetone at 137.5 °C (30%RH). We propose a plausible mechanism for sensing performance improvement. Namely, the substitution of Ru 4+ regulated the carrier concentration and induced the change of Co 3 O 4 defect oxygen and chemisorbed oxygen.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2013
·Vol. 3
·期 1
·1-8
·
IF 2.927
Zha Zhengbao,Wang Jinrui,Qu Enze,Zhang Shuhai,Jin Yushen,Wang Shumin,Dai Zhifei
Ultrasound (US) imaging provides a valuable opportunity to administer photothermal therapy (PTT) of cancer with real-time guidance to ensure proper targeting, but only a few theranostic agents were developed by physically grafting near infrared (NIR)-absorbing inorganic nanomaterials to ready-made ultrasound contrast agents (UCAs) for US imaging guided PTT. In this paper, NIR absorbing hollow microspheres were generated from polypyrrole merely using a facile one-step microemulsion method. It was found that the obtained polypyrrole hollow microspheres (PPyHMs) can act as an efficient theranostic agent not only to enhance US imaging greatly, but also exhibit excellent photohyperthermic effects. The contrast consistently sustained the echo signals for no less than 5 min and the NIR laser light ablated the tumor completely within two weeks in the presence of PPyHMs. More importantly, no use of additional NIR absorber substantially minimizes an onetime dose of the theranostic agent.
研究领域:
生物医学工程
·
癌症治疗
✓ 已验证
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2017
·
IF 4.055
Meng Pan,Jiajun Zheng,Yujian Liu,Qinglan Kong,Huiping Tian,Ruifeng Li
Hollow zeolite microspheres have attracted considerable interest due to their unique properties and great potential applications. In this work, we report a simple and cost-effective approach for constructing hollow zeolite microspheres based on a biomass-derived template, i.e., carboxymethylcellulose sodium (CMC). As an example, a hollow ZSM-5 microsphere with a hollow core smaller than 1 μm in diameter and a complete crystal shell is synthesized. This approach overcomes most of the limitations associated with the existing methods, such as complex operations and costly spherical templates. By studying the growth process in detail, a possible formation mechanism is proposed. The crystallization of the hollow zeolite microsphere is through a “surface to core” process, in which the interaction between the CMC and the zeolite gel and the decomposition of the polymer network play the critical roles.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 4
·4115-4119
·
IF 1.338
Qiao Xiuqing,Hu Fuchao,Hou Dongfang,Li Dongsheng
SnO2/Ag hollow microsphere, assembled form SnO2 and Ag nanoparticles, was synthesized via a facile one-step hydrothermal synthesis method using Na2SnO3.3H2O, CO(NH2)2 and AgNO3 as raw materials.
XRD, SEM, and TEM results revealed that the obtained SnO2/Ag hollow microsphere with diameters of ca.3∼5 μm was built from uniformly distributed rutile SnO2 and cubic Ag nanoparticles. Moreover, XPS results indicate the existence of strong interaction between
Ag and SnO2 nanoparticles, rather than simply physical contact, endowing the SnO2/Ag hollow microspheres with excellent photocatalytic performance in the degradation of RhB solution under visible light irradiation.
研究领域:
材料科学
·
纳米技术
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Long Chen,Sijie Su,Peijing Tian,Jian Yuan,Weihong Zheng
Rare earth elements have attracted significant attention due to their unique electronic structure. By doping rare earth ions into oxides, they can be used as spectral conversion materials in fields such as photovoltaic power generation and biological probes. In this paper, the performance of Eu 3+ doped Al 2 O 3 hollow microspheres by sol-gel method was analyzed by SEM, XRD, IR, TG-DSC, and fluorescence spectrometer. Using aluminum isopropoxide (Al(OC 3 H 7 ) 3 ) as raw material, PMMA with a particle size of 150 nm as the template, PMMA/boehmite particles with core-shell structure can be prepared by sol gel method and template method. After adding Eu 3+ and heat treatment, a transition occurred from γ-AlOOH(85 °C)→γ-Al 2 O 3 (600 °C)→θ-Al 2 O 3 (1000 °C)→α-Al 2 O 3 (1200 °C) as the temperature increased, and EuAlO 3 was generated at 1200 °C. Eu 3+ occupied the sites without inversion centers inside the host lattice, and the alumina was an effective matrix for the fluorescent properties of Eu 3+ . Its excitation was caused by the 7 F 0 → 5 L 6 transition, and its luminescence was controlled by the 5 D 0 → 7 F 2 transition, which can convert ultraviolet light into red and orange light. The fluorescence intensity increases with the increase of Eu 3+ content, and no quenching was observed at a doping concentration of 10mol% Eu 3+ .
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 38
·14814-14826
·
IF 8.262
Xiao Ge,Xiangyang Song,Yue Ma,Hongjian Zhou,Guozhong Wang,Haimin Zhang,Yunxia Zhang,Huijun Zhao,Po Keung Wong
The eutrophication of water bodies caused by the excessive release of phosphorus is becoming a serious world-wide environmental problem. To address this issue, the exploitation of three-dimensional (3D) hierarchical architectures will be an effective strategy for sequestrating phosphate and preventing the occurrence of eutrophication. In this study, 3D flower-like hierarchical iron containing MnO2 hollow microspheres have been successfully fabricated via a facile one-step template-free route for the efficient removal of phosphate. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) studies show that the microspheres obtained consist of numerous intertwining nanosheets. Strikingly, the thickness of these nanosheets can be elaborately modulated ranging from 30 to 2 nm via varying Fe/Mn ratios, accordingly resulting in variation in the resultant phosphate adsorption performance. The uptake of phosphate onto these hierarchical microspheres shows that the obtained hierarchical iron containing MnO2 hollow microspheres possess markedly enhanced phosphate removal performance over undoped counterparts regardless of the removal rate or efficiency; meanwhile, the enhanced effect becomes more obvious with increasing iron amount due to the larger specific surface area and abundant active sites. In particular, the hierarchical MnO2 microspheres with 15 at% Fe incorporation are capable of removing completely low concentration phosphate (below 10 ppm) at a dosage of 0.5 g L−1. In addition, the as-obtained materials exhibit high sorption selectivity toward phosphate over other coexisting ions or dissolved organic matter (DOC) at high levels, which can be ascribed to the unique hierarchical structures and strong interaction between Mn/Fe sites and phosphate, as confirmed by Fourier-transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses. Furthermore, the regenerated materials can be repeatedly used for five cycles without obvious degradation of performance, suggesting the sustainability of the adsorbents. By virtue of the high removal efficiency, fast adsorption kinetics, preferable sorption selectivity, as well as satisfactory recyclability, the obtained hierarchical iron containing MnO2 hollow microspheres will be promising in eliminating the phosphate pollution from eutrophic waters.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Li-Ping Yang,Yang Wang,Xue-Qing Zhao,Xi-Jie Lin,Bei-Bei Zhang,Yong-Gang Sun,Song Chen
Hollow structure has great potential in lithium-ion batteries, especially in Si-based anode materials . Unlike the usual templating process, here, we report a template-free synthetic strategy to build hollow microspheres of Si-C hybrid materials , which combines an in-situ polymerization process to form precursor and magnesiothermic reduction towards the inner cavity. As a result, the hollow Si-C microspheres exhibit improved cycling performance (768.7 mA h g −1 after 100 cycles at 0.84 A g −1 ) and good rate capability (497.1 mA h g −1 at 8.4 A g −1 ) when used as an anode material in lithium-ion batteries. This work provides a controllable and industrially-scalable operation based on cheap source to synthesize hollow Si-C hybrid materials, which combines the advantage of hollow structure and carbon matrix to achieve better electrochemical performance than the solid one.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 14
·8264-8271
·
IF 3.108
Zhan Jiang,Kaihua Huang,Dian Yang,Shuai Wang,Hong Zhong,Chongwen Jiang
Mn3O4 hollow microspheres have been facilely prepared via a green synthesis of 2,3,5,6-tetrachloropyridine reduced from pentachloropyridine by manganese. The specific hollow microspheres were made by a H2 gas bubble-templating method presenting a high specific surface area (87.1 m2 g−1) and a big total pore volume (0.2030 cm3 g−1). The Mn3O4 hollow microspheres as an anode material demonstrate a good electrochemical performance, with a high reversible capacity of 646.9 mA h g−1 after 240 cycles at a current density of 200 mA g−1. The good cycling performance is attributed to numerous mesopores, high specific surface area and big total pore volume, which can offer good electrical contact and conductivity as well as accommodate the mechanism strains. In addition, the yield and selectivity of 2,3,5,6-tetrachloropyridine achieved up to 99.2% and 99.5%, respectively.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 5
·353
·
IF 3.504
Yue Chen,Yuanyuan Zhang,Qiangwei Kou,Yang Liu,Donglai Han,Dandan Wang,Yantao Sun,Yongjun Zhang,Yaxin Wang,Ziyang Lu,Lei Chen,Jinghai Yang,Scott Guozhong Xing
In this work, we report the enhanced catalytic reduction of 4-nitrophenol driven by Fe3O4-Au magnetic nanocomposite interface engineering. A facile solvothermal method is employed for Fe3O4hollow microspheres and Fe3O4-Au magnetic nanocomposite synthesis via a seed deposition process. Complementary structural, chemical composition and valence state studies validate that the as-obtained samples are formed in a pure magnetite phase. A series of characterizations including conventional scanning/transmission electron microscopy (SEM/TEM), Mössbauer spectroscopy, magnetic testing and elemental mapping is conducted to unveil the structural and physical characteristics of the developed Fe3O4-Au magnetic nanocomposites. By adjusting the quantity of Au seeds coating on the polyethyleneimine-dithiocarbamates (PEI-DTC)-modified surfaces of Fe3O4hollow microspheres, the correlation between the amount of Au seeds and the catalytic ability of Fe3O4-Au magnetic nanocomposites for 4-nitrophenol (4-NP) is investigated systematically. Importantly, bearing remarkable recyclable features, our developed Fe3O4-Au magnetic nanocomposites can be readily separated with a magnet. Such Fe3O4-Au magnetic nanocomposites shine the light on highly efficient catalysts for 4-NP reduction at the mass production level.Keywords:Fe3O4hollow microspheres;Fe3O4-Au magnetic nanocomposites;catalytic reduction;4-nitrophenol
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Haochuan Jing,Ruipeng Ou,Hongbin Yu,Yahui Zhao,Ying Lu,Mingxin Huo,Hongliang Huo,Xianze Wang
The emergence of antibiotics in surrounding environment has aroused serious concerns. In this work, a direct Z-scheme heterojunction was constructed by integrating g-C 3 N 4 nanoparticles (g-C 3 N 4 NP) with WO 3 hollow microsphere composed of nanosheets (WO 3 NHMs) and developed as highly efficient photocatalyst for tetracycline hydrochloride (TC) removal. The hierarchical structure of WO 3 NHMs not only enhanced the optical absorption of catalyst by multiple reflecting and scattering of photons, but also promoted the adsorption of reactant molecules owing to the high surface area generated from the self-assembly interconnected nanosheets. The close contact between the interfaces of g-C 3 N 4 NP and WO 3 NHMs led to effective charge separation and transfer, and the optimized Z-scheme architecture preserved the oxidation and reduction capacity of each component to the greatest extent. After optimizing the component ratio, the corresponding g-C 3 N 4 NP/WO 3 NHMs hybrid delivered a significantly prominent photocatalysis towards TC degradation, whose kinetic constant was 2.42 times as high as that of bulk g-C 3 N 4 , and 6.88 folds as great as that of pristine WO 3 NHMs. As far as we know, this is the first report of integrating C 3 N 4 NP with WO 3 NHMs to enhance TC photodegradation through the synergistic effect of light absorption, quantum efficiency and adjusted surface characteristics. The active species capture experiments testified that h + and OH originated from the reaction of electrons with oxygen played important roles in the photocatalytic process. Under the attack of reactive oxygen species, TC underwent demethylation, deacylation, and ring-opening processes, and ultimately mineralized into CO 2 and H 2 O. This research can open up a new way to develop photocatalysts with high TC removal efficiency through reasonable structural configuration.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Ji Ma,Jie Hu,Yin Tang,Hanxiao Gu,Min Jiang,Jianming Zhang
In situ interfacial growth of nanoparticles induced by a Pickering emulsion is recognized as a practical method for the fabrication of hollow composites. Herein, hybrid hollow microspheres were prepared using cellulose nanocrystals (CNCs) emulsified water-dodecane system as a template. The hybrid microspheres were composed of zeolitic imidazolate framework-8 (ZIF-8) shells and CNCs surface-layers. ZIF-8 crystals formed and grew at the oil-water interface with a low ligand/metal ion molar ratio. The composite microspheres owned rich porous structure with a high surface area of 1240 m 2 g −1 and performed obvious hydrophilicity owing to the role of CNCs layers. The two characters offered CNCs/ZIF-8 composite materials with very prominent adsorption capacity towards dyes (1060.2 mg g −1 for malachite green). Carbonization of CNCs/ZIF-8 composite materials afford ZIF-8 based materials more effective removal of methylene blue from water under sunlight, owing to the photocatalytic role of ZnO remained in carbonized product. This research paves the way to realize a variety of hollow CNCs/ZIFs hybrid materials for different application purposes.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-8
·
IF 5.578
Niu Xiaoyu,Zhao Tieying,Yuan Fulong,Zhu Yujun
The hollow CuO@SiO 2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO 2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method. The obtained hollow CuO@SiO 2 spheres were characterized by ICP-AES, nitrogen adsorption-desorption, SEM, TEM, XRD, H 2 -TPR, CO-TPR, CO-TPD and NO-TPD. The results revealed that the hollow CuO@SiO 2 spheres consist of CuO uniformly inserted into SiO 2 layer. The CuO@SiO 2 sample exhibits particular catalytic activities for CO oxidation and NO + CO reactions compared with CuO supported on SiO 2 (CuO/SiO 2 ). The higher catalytic activity is attributed to the special hollow shell structure that possesses much more highly dispersed CuO nanocluster that can be easy toward the CO and NO adsorption and the oxidation of CO on its surface.
研究领域:
材料化学
·
催化化学
·
纳米材料科学
·
环境催化
·
无机合成
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）