Nano Research
·
2021
·Vol. 15
·期 1
·502-509
·
IF 8.897
Yang Dandan,Li Xiaoming,Li Yuelei,Cai Bo,Su Lin,Zhang Shengli,Juan Zhili,Meng Cuifang,Geng Dongling,Chen Jiaxin,Xu Feng,Zeng Haibo
Controllable anisotropic growth of perovskite nanocrystals (NCs) is challenging since it is difficult to separate the nucleation and growth processes. Here, a two-step nucleation strategy is proposed to control the binding interaction between surface ligands and NCs, resulting in facet-induced coordination competition. Oleic acid as surface activated ligand leads to the formation of defective lead bromine octahedron, and the binding interaction between 4-dodecylbenzenesulfonic acid and lead atoms promotes the formation of two kinds of binding interactions. Based on this strategy, the anisotropic growth of CsPbBr 3 nanoplatelet (NPLs) with adjusted length from 11.4 to 24 nm, and the evolution of NPLs from stacked to tongue-shaped have been realized. Elemental line scan reveals the sulfur atoms mainly distribute at the edge of NPLs. Furthermore, binding energy calculation and experimental results illustrate the coordination competition of different binding interaction on specific facets induces the anisotropic growth of NPLs. Importantly, strong emission anisotropy of highly ordered NPLs with polarization ratio up to 0.58 is illustrated. This work not only deepens our understanding of the controllable synthesis of perovskite NCs, but also provides a reference for the regulation of light emitting diode and soler cells.
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高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Lin Huang,Zikang Ye,Lei Yang,Jiongzhao Li,Haiyan Qin,Xiaogang Peng
Localization of exciton wavefunctions away from the inorganic–organic interface is proposed for synthesizing colloidal spheroidal quantum dots (QDs) with an ultranarrow photoluminescence (PL) peak width. This strategy is demonstrated by synthesizing uniform-alloy CdxZn1–xSe and CdxZn1–xSe/ZnSe/ZnS core/shell QDs. For blue-emitting QDs, the ensemble PL full width at half-maximum (fwhm) reaches 10.2 nm and the corresponding single-dot PL fwhm is 5.2 nm. The ensemble and single-dot PL fwhm values for green-emitting QDs are 16.3 and 9.7 nm, respectively. These record-low PL fwhm values for spheroidal QDs are close to the requirements for ideal displays. To control the composition homogeneity, the synthetic scheme is separated into four consecutive steps, namely, nucleation of monodisperse CdSe core QDs, epitaxial growth of thickness-controlled CdSe/ZnSe core/shell QDs with a low degree of spontaneous alloying, Cu-catalyzed alloying for uniform-alloy QDs, and additional epitaxy of outer ZnSe and ZnS shells onto uniform-alloy CdxZn1–xSe QDs. Among all metal ions tested, copper ions are identified to be the best catalysts for forming uniform-alloy CdxZn1–xSe QDs, which can enter a QD rapidly to initiate alloying and effectively exit a QD after the alloying process under the experimentally feasible conditions.
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Journal of Analysis and Testing
·
2021
·Vol. 5
·期 1
·3-10
·
IF 0
Huang Guo-Bin,Guo Zhi-Yong,Ye Ting-Xiu,Zhang Chen,Zhou Yan-Mei,Yao Qiu-Hong,Chen Xi
Cubic phase CsPbBr 3 perovskite nanocrystals (PNCs) was prepared by a high-temperature hot-injection method. The high photoluminescence quantum yield (PLQY) of as-prepared CsPbBr 3 PNCs was 87%, which can be used for the determination of chloridion in domestic water samples based on their wavelength-shift characteristics via halide exchange. The proposal approach for the determination of chloridion reveals a linear correlation ranged from 10 to 200 μM of the chloridion concentration and the wavelength shift of CsPbBr 3 PNCs with a correlation coefficient of R 2 = 0.9956. The as-mentioned method reveals neglectable responses towards those co-existing ions in the water aside from chloridion, due to the quick exchange between Cl and Br and the outstanding color change caused by wavelength shift. The strategy has been applied to the determination of chloridion in water samples with the recoveries of 98.9–104.2% and the limit of detection (LOD) of 4 μM. These results show that the suggested approach is promising for the development of novel fluorescence detection for chloridion in water.
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ACS Nano
·
2021
·
IF 15.881
Fan Li,Yuan Zong,Yanling Ma,Mingxu Wang,Wen Shang,Peng Tao,Chengyi Song,Tao Deng,Hong Zhu,Jianbo Wu
To explore the ordering mechanism of facet alloy nanocrystals with randomly distributed atoms, we investigate kinetic and thermodynamic behaviors of the ordering phase transition from face-centered cubic Pt3Co nanocrystals to L12-Pt3Co intermetallic nanocrystals. It is observed that the ordering occurs from the surface and then gradually into the interior in a layer-by-layer mode, involving the competition between two kinds of phase transition modes: long-range surface diffusion-induced phase transition (SDIPT) and short-range reconstruction-induced body phase transition (RIBPT). The density functional theory calculations demonstrate that the surface status acts as a pivotal part in the thermodynamics and kinetics of the nanoscale ordering transition. With the development of the controllable heating process, both SDIPT and RIBPT modes can be manipulated as well as the morphology of the final product. This in situ work lays the foundations for potentially realizing shape-controlled intermetallic nanostructures by utilizing the thermal annealing method and makes preparations for the rational design of the surface and near-surface atomic configurations at the atomic scale.
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PubMed
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 11
·5817-5825
·
IF 7.79
Xiaohui Zhu,Wen Han,Yongfei Liu,Haihui Wang,Danying Lin,Zhangcheng Fu,Yu He,Xiaofei Yin,Chunhua Lu,Huanghao Yang
Photothermal therapy (PTT) has been extensively used as an effective therapeutic approach against cancer. However, PTT can trigger the proinflammatory response of dendritic cells (DCs) and macrophages to release proinflammatory cytokines, which can simulate tumor regeneration and further hinder subsequent therapy. Hence, an effective therapeutic system, comprising gold nanoparticle modified Cu2ZnSnS4 nanocrystals and aspirin (Au-CZTS/Asp), was developed to co-deliver PTT agents and inflammatory inhibitors for the synergistic treatment of cancer. Au-CZTS with high near infrared (NIR) photothermal conversion abilities can effectively induce apoptosis and tumor ablation under NIR light. Furthermore, Asp can inhibit the activation of the cGAS-STING pathway in DCs and the polarization of macrophages to intercept the PTT mediated inflammatory responses. Therefore, the as-prepared Au-CZTS/Asp can effectively realize the integration of tumor treatment and recovery. Simultaneously, the Au-CZTS/Asp with ultrasmall size can be rapidly cleared to reduce biotoxicity and side effects. In addition, the Au-CZTS/Asp showed excellent photoacoustic (PA) imaging properties around the tumor in vivo. Thus, our study provides a potential platform for a nano-prodrug that is viable for cancer diagnostic-treatment-recovery integration.
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PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Zhen Wang,Shuqi Hu,Asad Ali,Hongling Chen,Pei Kang Shen
The development of highly active and stable catalysts is a critical challenge which affects the practical application of the direct methanol fuel cells. Alloying Pt with other metals is an effective strategy to form the bimetallic or trimetallic catalysts, which not only decreases the consumption of Pt but also optimizes the electronic structure of Pt, in turn enhancing the catalytic activity. Herein, we use a facile one-pot solvothermal reduction method to synthesize Ag nanocubes (NCs) enclosed by PtRh nanoparticles as a trimetallic Ag@PtRhAg NC core–shell catalyst toward methanol oxidation reaction (MOR). Notably, the core–shell structure is formed because of the presence of N,N-dimethylacetamide, which promotes the preferential reduction of Ag by reducing the reduction potential of Ag atoms. Meanwhile, the bromide ions originating from cetyltrimethylammonium bromide controlled the growth of the cubic morphology. Benefiting from the pleated exterior providing more active sites and the synergistic effect between Pt, Rh, and Ag, the mass and specific activities of Ag@PtRhAg NCs are 4.22 and 3.78 times higher than those of commercial Pt/C, respectively. More impressively, because of the better CO tolerance, Ag@PtRhAg NCs display strengthened durability by maintaining 84.9% mass activity after 1000 MOR cycles compared to the initial value. The present work provides a one-step strategy to synthesize a core–shell nanostructure catalyst for enhancing the MOR activity.
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Materials Advances
·
2021
·Vol. 2
·期 4
·1320-1327
·
IF 0
Yao Liu,Aifei Wang,Jiajing Wu,Chuying Wang,Ziliang Li,Guangcai Hu,Shiqi Sui,Jia-Xin She,Wen Meng,Weiqiang Li,Zhengtao Deng
In recent years, two-dimensional (2D) layered tin halide perovskites have attracted much attention due to their excellent luminescence properties compared with their three-dimensional (3D) analogs. Here, we synthesized 2D perovskites of the form (RNH3)2SnBr4 through a facile hot-injection approach without the use of toxic tri-n-octylphosphine (TOP) as the solvent. We found that these compounds have strong photoluminescence (PL) emission with high PL quantum yields (QY) of 35% ((C6H13NH3)2SnBr4), 82% ((C8H17NH3)2SnBr4), 60% ((C12H25NH3)2SnBr4) and 50% ((C18H35NH3)2SnBr4). Among them, ((C6H13NH3)2SnBr4) was synthesized for the first time; however, (C18H36NH3)2SnBr4 perovskites showed the best stability with a PL QY decrease of less than 1% after 30 days under ambient air and humidity conditions. In addition, other 2D (C8H17NH3)2SnX4 (X = Br, I, or mixture) perovskites were prepared by adjusting the halide ratio, resulting in spectral tunability from yellow to red. Interestingly, through Zn2+ doping, the morphology became more uniform, and the PL stability was significantly improved. Finally, we used Zn2+-doped (C8H17NH3)2SnBr4 yellow phosphor to fabricate UV-pumped yellow LEDs. We expect these 2D perovskites to be promising phosphors in future solid-state lighting and display technologies.
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Nature Photonics
·
2020
·Vol. 15
·期 3
·238-244
·
IF 31.241
Chen Jiawei,Wang Jian,Xu Xiaobao,Li Jinhang,Song Jizhong,Lan Si,Liu Sinan,Cai Bo,Han Boning,Precht Jake T.,Ginger David,Zeng Haibo
At present, electric lighting accounts for ~15% of global power consumption and thus the adoption of efficient, low-cost lighting technologies is important. Halide perovskites have been shown to be good emitters of pure red, green and blue light, but an efficient source of broadband white electroluminescence suitable for lighting applications is desirable. Here, we report a white light-emitting diode (LED) strategy based on solution-processed heterophase halide perovskites that, unlike GaN white LEDs, feature only one broadband emissive layer and no phosphor. Our LEDs operate with a peak luminance of 12,200 cd m −2 at a bias of 6.6 V and a maximum external quantum efficiency of 6.5% at a current density of 8.3 mA cm −2 . Systematic in situ and ex situ characterizations reveal that the mechanism of efficient electroluminescence is charge injection into the α phase of CsPbI 3 , α to δ charge transfer and α–δ balanced radiative recombination. Future advances in fabrication technology and mechanistic understanding should lead to further improvements in device efficiency and luminance.
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高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Wei Wang,Pengyin Deng,Xiqing Liu,Yuqin Ma,Yongsheng Yan
The abuse of tetracycline (TC) antibiotics would seriously affect human health and hence the detection had become essential. Here, we had constructed a hydrophobicity of fluorescence sensor based on the excellent photoluminescence emission of CsPbBr 3 QDs and the hydrophobic ability of Boron Nitride (BN). This design effectively solved the instability of CsPbBr 3 QDs and realized the sensitive detection of TC. Under optimum conditions, the linear range of TC was 0–0.44 mg L −1 with the 6.5 μg L −1 . Furthermore, the sensor was successfully used for the recognition of TC in honey and milk samples. This work also provided an ideal for designing CsPbBr 3 QDs-based on fluorescence sensor.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jing Hong,Tong Wu,Haiyang Wu,Birong Zeng,Shanni Zeng,Ting Chen,Xiu Wang,Zhenwu Lu,Conghui Yuan,Krishnasamy Balaji,Denise F.S. Petri,Lizong Dai
In an attempt to develop an efficient flame retardant for epoxy resin (EP), a hierarchical “dots-core–shell” structure Ag@HNT@PZE was prepared via simple two-step reactions including in-situ growth of Ag within halloysite nanotubes (HNT) and a crosslinking polymerization of polyphosphazene (PZE) coating on Ag@HNT surfaces. Wherein, the dots represented Ag nanoparticles, the core represented HNT , and the shell referred to PZE. Here, Ag encapsulated within HNT acts as an interfacial catalyst to effectively degrade toxicity gas (e.g. CO), while PZE acts as an interfacial compatibilizer for enhancing the dispersion and flame retardant efficiency of Ag@HNT@PZE in the matrix. The flammability and smoke toxicity of EP/Ag@HNT@PZE nanocomposites were both reduced greatly compared to neat EP. The limited oxygen index (LOI), UL-94 grade and char yield of composite EP/5Ag@HNT@PZE reached 33.6 ± 0.72%, V-0 level and 22.8% respectively. Moreover, the peak heat release rate (pHRR) was reduced by 34.2%, accompanied by a higher ratio of graphitized char layer. It showed that flammable pyrolysis products released from EP during combustion were distinctly inhibited because Ag nanoparticles could catalyze the conversion of flammable gas CO to nonflammable CO 2 , which were verified by the density functional theory (DFT) calculations. It was assumed that halloysite-based hybrid flame retardant could have an impact on toxicity-suppressing and catalyze char formation to produce a barrier effect. The combination of metal-immobilized at clay nanotubes interiors for agglomeration-tolerant and PZE-modified at clay nanotubes exterior for shell-protective provides a potential way to develop efficient flame retardant for the manufacture of nanocomposites with higher fire safety.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Xiao Chen,Jianyu Li,Yue Wang,Ying Zhou,Qiulian Zhu,Hanfeng Lu
Metal-based monolithic catalysts have excellent electrical and thermal conductivity, impact resistance, ductility, and mechanical properties. Thus, they have a broader application prospect than ceramic-based monolithic catalysts. In this work, high-dispersion Pd nanoparticle dispersion liquid was synthesized by using the solvothermal method. Moreover, nickel-foam-supported Pd/NiO (Pd/NiO/Ni foam) monolithic catalyst with good catalytic combustion performance was prepared successfully by simply spraying the dispersion liquid on the surface of Ni foam, which was oxidized at high temperature to grow NiO film. A novel electric heating catalytic combustion reactor with fast response and safety was constructed by nesting Pd/NiO/Ni foam with an insulated heating rod. Notably, even at the high space velocity of 50,000 h −1 , the constructed reactor can completely degrade 2500 ppm of toluene at 230 ℃ and exhibits good catalytic activity for hydrocarbons and oxygen-containing and heteroatom-containing organic compounds.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 9
·1-11
·
IF 2.132
Zhao Yubin,Li Meng,Matras-Postolek Katarzyna,Yang Ping
Sn 2+ ions were introduced in Cs-Pb-Br nanocrystals (NCs) to test the change of crystal structure and photoluminescence (PL) property. In the cases of Sn/Pb ratios less than 20%, the CsPb 1- x Sn x Br 3 NCs revealed CsPbBr 3 crystal structure. With increasing the Sn/Pb ratio, Cs-Pb-Sn-Br NCs exhibited a mixture phase of CsPbBr 3 and Cs 4 PbBr 6 . The NCs show bright PLQYs (87%) for Sn/Pb molar ratio of 30%. This is ascribed to little amount Cs 4 PbBr 6 decreased the electrons and holes non-radiation recombination of CsPbBr 3 . With increasing the Sn/Pb ratio to 80%, the Cs 4 Pb 1- x Sn x Br 6 NCs exhibited pure Cs 4 PbBr 6 phase structure. Furthermore, a weak blue-emitting peak around 450 nm was observed for the Cs 4 Pb 1- x Sn x Br 6 NCs. This confirms that Sn 2+ ions were successfully introduced into Cs 4 PbBr 6 structure. The morphologies of samples changed from initial cubic to hexagonal with increasing Sn/Pb ratios from 20 to 80%. The excitons and free carrier dynamics of the NCs were discussed. Graphical abstract
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危险品化学品经营许可证（带存储）