APPLIED SURFACE SCIENCE
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2017
·
IF 3.387
Fangyuan Diao,Xinxin Xiao,Bing Luo,Hui Sun,Fei Ding,Lijie Ci,Pengchao Si
It is important to design and fabricate nanoporous metals (NPMs) with optimized microstructures for specific applications. In this contribution, nanoporous coppers (NPCs) with controllable thicknesses and pore sizes were fabricated via the combination of a co-sputtering of Cu/Ti with a subsequent dealloying process. The effect of dealloying time on porous morphology and the corresponding surface enhanced Raman scattering (SERS) behaviors were systematically investigated. Transmission electron microscopy (TEM) identified the presences of the gaps formed between ligaments and also the nanobumps on the nanoparticle-aggregated ligament surface, which were likely to contribute as the “hot spots” for electromagnetic enhancement. The optimal NPC film exhibited excellent SERS performance towards Rhodamine 6G (R6G) with a low limiting detection (10 −9 M), along with good uniformity and reproducibility. The calculated enhancement factor of ca. 4.71 × 10 7 was over Au substrates and comparable to Ag systems, promising the proposed NPC as a cheap candidate for high-performance SERS substrate.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 46
·7041-7049
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IF 3.474
Emmanuel Acheampong Tsiwah,Yanxi Ding,Zixiong Li,Zhiyong Zhao,Mingqing Wang,Chao Hu,Xiaoqing Liu,Chenghua Sun,Xiujian Zhao,Yi Xie
This study demonstrates a facile and general one-pot synthetic approach for all-inorganic colloidal cesium lead halide (CsPbX3, X = Cl, Br, I, mixed Cl/Br, Br/I) perovskite nanocrystals (NCs) by directly heating the precursors/solvent/ligands. In contrast to typical routes, these reactions are conducted in open air, requiring neither high temperature dissolution nor a vacuum/inert atmosphere. The composition, shape and size of the as-synthesized NCs can be finely tuned by varying the reaction parameters such as temperature and time, ligand species and precursor halide ratios. CsPbX3 morphologies may be varied from perovskite nanoplatelets (NPLs) to nanosheets and sphere-like NCs, each with tunable absorption spectra and photoluminescence (PL) emissions. In particular, mixed halide NCs with controllable band gaps and PL emission across the entire visible region have been demonstrated by tuning the precursor halide ratios. The reproducibility and scalability of the present synthetic protocol is elaborated by upscaling the amounts of chemicals and solvents/ligands in a representative synthesis of CsPbBr3 NPLs. The representative large-scale CsPbBr3 NPLs exhibit a high PL quantum yield of 73.56%.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2016
·Vol. 51
·期 10
·4856-4863
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IF 2.302
Han Sheng,Wang Chi,Huang Yanshan,Jiang Jianzhong,Huang Yinjuan,Xu Zhixiao,Wu Dongqing
Three-dimensional hybrids of cobalt oxide (Co 3 O 4 ) and graphene frameworks are fabricated via a facile hydrothermal self-assembly process. By adjusting the time of the hydrothermal treatment, the morphologies of the Co 3 O 4 components can be modified from rods to nanoparticles, which further manifest influences on the electrochemical performance of the hybrids. As the anode in lithium-ion battery, the hybrid loaded with spherical Co 3 O 4 nanoparticles exhibits the highest reversible capacity of 1148 mA h g −1 at 100 mA g −1 for 100 cycles among the three samples. Even at a high current density of 5000 mA g −1 , its reversible capacity is still kept at 600 mA h g −1 , outperforming the reported hybrids of Co 3 O 4 and graphene.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
·
IF 4.233
Kun-Le Jia,Jin Qu,Shu-Meng Hao,Fei An,Ya-Qiong Jing,Zhong-Zhen Yu
Construction of a heterostructure to prolong the life of electron-hole pairs is a very important approach to endow it with excellent photodegradation performances. Particularly, one-pot synthesis of heterostructures with the same component but different crystal structures to form a proper band gap is still challenging. Herein, bismuth silicate (BSO) heterostructures are synthesized using a one-pot hydrothermal approach without adding any other inorganic components. The crystal phase, morphology, surface state, and photochemical properties of the BSO materials are precisely tuned to fabricate two kinds of bismuth silicate heterostructures: rod-like Bi 2 SiO 5 /Bi 12 SiO 20 and flower-like Bi 2 SiO 5 /Bi 4 Si 3 O 12 heterostructures. Thanks to the two heterostructures and clean surface, the optimized BSO material exhibits a highly active photocatalytic performance with a remarkable cycling stability. It photodegrades Rhodamine B under visible light irradiation as fast as 15 min with the reaction rate constants k and k s to be 0.399 min −1 and 0.698 min −1 L m −2 , respectively, which is up to 189 times faster than reported.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
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2019
·Vol. 9
·期 67
·39315-39322
·
IF 3.049
Chang Liu,Jing Lin,Wei Zhai,Zhikai Wen,Xin He,Mengmeng Yu,Yang Huang,Zhonglu Guo,Chao Yu,Chengchun Tang
Doping metal ions in inorganic halide perovskite (CsPbX3, X = Cl, Br, I) nanocrystals (NCs) endows the NCs with unique optical characteristics, and has thus attracted immense attention. However, controllable synthesis of high-quality doped perovskite NCs with tunable morphology still remains challenging. Here, we report a facile, effective and unified strategy for the controllable synthesis of Mn-doped CsPbCl3 quantum dots (QDs) and nanoplatelets (NPLs) via a single-step solvothermal method. The incorporation of Mn2+ into CsPbCl3 NCs introduces new broad photoluminescence (PL) emission from Mn2+ while maintaining the structure of host CsPbCl3 NCs nearly intact. The PL intensity, emission peak position and size of the NCs can be accurately adjusted by altering the experimental parameters such as Mn-to-Pb feed ratio and reaction time. Especially, by changing the amount of ligands, Mn-doped CsPbCl3 QDs, NPLs or their mixtures can be obtained. Both of the Mn-doped QDs and NPLs exhibit a size-dependent quantum confinement effect, which is confirmed by the relationship between the size of NCs and the exciton emission peaks. The solvothermal reaction condition plays an important role for the precise control of the structure, morphology and PL properties of the Mn-doped NCs. The as-prepared Mn-doped CsPbCl3 NPLs with thickness down to ∼2 nm exhibit a PL quantum yield (PLQY) of more than 22%. This work introduces a new strategy for the controllable synthesis of Mn-doped perovskite NCs, which provides ideas for the in-depth study of the dope-and-grow process and can be extended to approaches of doping other metal ions.
研究领域:
材料科学
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纳米技术
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光电技术
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yingzhe Liu,Sida Ling,Zhuo Chen,Jianhong Xu
Shape-anisotropic hydrogel microparticles have attracted considerable attention for drug-delivery applications. Particularly, nonspherical hydrogel microcarriers with enhanced adhesive and circulatory abilities have demonstrated value in gastrointestinal drug administration. Herein, inspired by the structures of natural suckers, we demonstrate an ionic polymerization-based production of calcium (Ca)-alginate microparticles with tunable shapes from Janus emulsion for the first time. Monodispersed Janus droplets composed of sodium alginate and nongelable segments were generated using a coflow droplet generator. The interfacial curvatures, sizes, and production frequencies of Janus droplets can be flexibly controlled by varying the flow conditions and surfactant concentrations in the multiphase system. Janus droplets were ionically solidified on a chip, and hydrogel beads of different shapes were obtained. The in vitro and in vivo adhesion abilities of the hydrogel beads to the mouse colon were investigated. The anisotropic beads showed prominent adhesive properties compared with the spherical particles owing to their sticky hydrogel components and unique shapes. Finally, a novel computational fluid dynamics and discrete element method (CFD-DEM) coupling simulation was used to evaluate particle migration and contact forces theoretically. This review presents a simple strategy to synthesize Ca-alginate particles with tunable structures that could be ideal materials for constructing gastrointestinal drug delivery systems.
研究领域:
材料科学
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药学
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生物医学工程
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微流控技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2025
·
IF 9.7
Longshi Rao,Shengxin Zhu,Jiaying Liu,Qiuling Bai,Junxian Zou,Chuheng Deng,Hongze Tu,Qingxian Liu,Guisheng Zhong,Xiaodong Niu,Jiasheng Li
Carbon dots (CDs) are promising fluorescent nanomaterials with broad applications in optoelectronics, healthcare, and artificial photosynthesis. However, synthesizing indigo-emitting CDs with optimal properties remains challenging due to the inefficiencies and complexity of conventional methods. This study introduces a high-performance ultrasonic microreactor inspired by biomimetic leaf vein structures to enhance CD synthesis efficiency. We developed a COMSOL Multiphysics-based optimization framework to improve flow field uniformity and examine transport dynamics within the microchannel. This framework identified key parameters, including leaf vein contours, fractal angles, depth-to-width ratios, and inlet configurations, that govern flow characteristics. Additionally, we optimized ultrasonic energy transfer by directly coupling the transducer with the microreactor, determining the optimal frequency (21 kHz) and power (100 W) for maximum reactor performance. Visualization experiments revealed how ultrasound regulates bubble dynamics, enhancing interfacial area and stabilizing suspension behavior. Using this optimized system, we synthesized indigo-emitting CDs with a maximum PLQY of 27.5 % and a narrow FWHM of ∼78 nm under 365 nm excitation. Multivariate experiments revealed how flow velocity, reaction temperature, and ultrasonic modulation influence the optical properties of the CDs. This work underscores the synergistic combination of ultrasonic energy, biomimetic design, and simulation-guided optimization, providing a solid foundation for scalable synthesis of carbon-based nanomaterials with applications in optoelectronics, healthcare, and beyond.
研究领域:
纳米技术
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材料科学
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化学工程
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光电子学
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声学工程
·
仿生学
✓ 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）