Journal of Physical Chemistry C
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2021
·
IF 4.126
Wanjie Xu,Mingwei Ji,Yuanzhi Chen,Hongfei Zheng,Laisen Wang,Dong-Liang Peng
The construction of magnetic colloidal superparticles can utilize the properties from both individual assembly units and their collective interactions; thus, it can meet wider demands in multiple fields. Although many studies have focused on the magnetic oxide superparticles, very limited study has been conducted on magnetic metal superparticles. Herein, we report on the microemulsion-based preparation of Ni colloidal superparticles with tunable sizes and magnetic properties. The prepared Ni colloidal superparticles have a spherical morphology with an average size that can vary from 130 to 700 nm. The key influential factors in the formation of superparticles are being investigated. Magnetic measurements reveal room-temperature superparamagnetic characteristics for all superparticle samples. The calculated interaction energy values indicate that strong magnetic interactions are present in Ni superparticles. Although Ni superparticles with a size of about 700 nm are still room-temperature superparamagnetic, annealed Ni superparticles with a much smaller size of about 390 nm instead exhibit room-temperature ferromagnetic characteristics. This behavior is quite different from that of magnetic nanoparticles. Our results demonstrate that the construction of magnetic colloidal superparticles through adjustments to the parameters of the assembling units may provide them with rich magnetic properties, thus making them useful in a wider range of applications.
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Nature Photonics
·
2021
·Vol. 15
·期 5
·379-385
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IF 38.771
Liu Mingming,Wan Qun,Wang Huamiao,Carulli Francesco,Sun Xiaochuan,Zheng Weilin,Kong Long,Zhang Qi,Zhang Congyang,Zhang Qinggang,Brovelli Sergio,Li Liang
The thermal quenching of light emission is a critical bottleneck that hampers the real-world application of lead halide perovskite nanocrystals in both electroluminescent and down-conversion light-emitting diodes. Here, we report CsPbBr 3 perovskite nanocrystals with a temperature-independent emission efficiency of near unity and constant decay kinetics up to a temperature of 373 K. This unprecedented regime is obtained by a fluoride post-synthesis treatment that produces fluorine-rich surfaces with a wider energy gap than the inner nanocrystal core, yielding suppressed carrier trapping, improved thermal stability and efficient charge injection. Light-emitting diodes incorporating these fluoride-treated perovskite nanocrystals show a low turn-on voltage and spectrally pure green electroluminescence with an external quantum efficiency as high as 19.3% at 350 cd m −2 . Importantly, nearly 80% of the room-temperature external quantum efficiency is preserved at 343 K, in contrast to the dramatic drop commonly observed for standard CsPbBr 3 perovskite nanocrystal light-emitting diodes. These results provide a promising pathway for high-performance, practical light-emitting diodes based on perovskite nanostructures.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Menghan Wang,Zhen Wang,Shuqi Hu,Xinxin Zhu,Xu Lin,Xinyi Zhang,Pei Kang Shen
Committed to improving the utilization efficiency of Pt atoms and accurately controlling the morphology and composition of nanocatalysts to boost the Pt-based catalyst performance has become the focus of research. Herein, the PtRhNi truncated triangular nanoflakes (TA-NFs) catalyst with a unique PtRh-rich surface structure was successfully prepared by an effective one-pot synthetic method based on the galvanic replace reaction. The freestanding 2D nanostructure of PtRhNi TA-NFs, intrinsically possessing much high specific surface area and surface atomic, and the PtRh-rich characteristics of the surface is undoubtedly the most feasible model to simultaneously achieve high atom utilization. Benefiting from this novel structure, the as-obtained PtRhNi TA-NFs nanocatalyst exhibits excellent performance for ORR and MOR, delivering a mass activity of 0.92 A mg pt -1 for ORR, which is 2.03, 1.64, and 6.9-fold higher than that of PtRhNi nanoparticls (NPs), PtNi truncated triangle nanoflakes (TA-NFs) and commercial Pt/C, respectively. In addition, after 20 k cycles ADT test, PtRhNi TA-NFs show only 10 mV negative shift of half-wave potential and retain 70% of initial value of mass activity. Furthermore, a mass activity is 1.28 A mg pt −1 is achieved after applying this unique nanocatalyst for MOR, which is 1.28,1.5, and 2.6 times higher than that of PtRhNi NPs, PtNi TA-NFs and Pt/C, respectively. Impressively, the PtRhNi TA-NFs nanocatalyst shows an ultrahigh stability even after 2 k cycles ADT measurement in acid solution, and the mass activity is only drop 2% of initial value. This work provides a new strategy to synthesis high-performance of bifunction Pt-based electrocatalyst for ORR and MOR fuel cells.
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Nano Today
·
2021
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IF 20.722
Shaojun Peng,Hao Wang,Yongjie Xin,Wei Zhao,Meixiao Zhan,Jingchao Li,Rong Cai,Ligong Lu
Hydrogen selenide (H 2 Se) plays key roles in diverse physiological processes ; however, the noninvasive regulation of H 2 Se levels in living systems has been rarely achieved and the functional mechanism of H 2 Se in cancer cells remains unclear. Herein, biocompatible ferrous selenide (FeSe 2 ) nanoflowers with second near-infrared (NIR-Ⅱ) photoactivatable H 2 Se generation were developed for metastasis-inhibited cancer therapy. Upon NIR-II laser irradiation, FeSe 2 nanoflowers generated mild photothermal effect, leading to their decomposition and on-demand release of H 2 Se to induce cell death. Such a FeSe 2 nanoflower-mediated synergistic photothermal-H 2 Se gas therapy effectively suppressed the tumor growth in a subcutaneous breast tumor-bearing mouse model. Furthermore, the local generation of H 2 Se was proved to down-regulate the expression levels of metastasis-related proteins, contributing to the complete inhibition of liver and lung metastasis. Overall, we report a NIR-Ⅱ photoactivatable H 2 Se production strategy for metastasis-inhibiting cancer therapy, which may be mediated by autophagy, opening a new avenue for the biomedical application of H 2 Se in the future.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 32
·10414-10424
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IF 7.393
Meiyu Zhang,Zhicheng Shi,Jifu Zhang,Kun Zhang,Li Lei,Davoud Dastan,Bohua Dong
Two-dimensional nanomaterials are promising fillers for dielectric nanocomposites because of their high specific surface areas which can induce strong interfacial polarization and result in improved dielectric permittivity. In this work, ultrathin amorphous FePO4 nanosheets with a thickness of about 3.7 nm are successfully obtained using a one-step solvothermal method and are further dispersed into a P(VDF–HFP) matrix, forming FePO4/P(VDF–HFP) nanocomposites. Obviously enhanced dielectric permittivities are achieved owing to the strong interfacial polarization at the huge interfaces between the FePO4 nanosheets and the P(VDF–HFP) matrix. A greatly enhanced dielectric permittivity of 18.5@10 kHz, which is about 240% that of the P(VDF–HFP) matrix, is obtained in the composite with merely 2 wt% FePO4 nanosheets. Furthermore, bilayer paraelectric/ferroelectric composites, in which pure polyetherimide acts as the paraelectric layer and the FePO4/P(VDF–HFP) composite as the ferroelectric layer, are fabricated. It is found that, the synergistic effect between the two layers results in a substantially suppressed loss and elevated breakdown strengths, as well as obviously improved energy density and discharge efficiency in comparison with the single layer FePO4/P(VDF–HFP) composites. Consequently, a high energy density of 7.58 J cm−3 and a high discharge efficiency of 81.6% are concurrently achieved in the bilayer composite with merely 0.5 wt% FePO4 nanosheets. The excellent dielectric energy storage performances make these composites promising candidates for advanced electrostatic capacitors.
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ORGANIC ELECTRONICS
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2021
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IF 3.721
Qing Zhou,Wenbo Ma,Zhenlong Zhang,Yuefeng Liu,Huafang Zhang,Yanli Mao
In this paper, double-layered hole transport material (HTM) was designed and fabricated by adding a thin CuInS 2 film between perovskite and Spiro-OMeTAD (Spiro) layers. The power conversion efficiency (PCE) of the perovskite solar cells (PSCs) with double-layered HTM of CuInS 2 /Spiro was improved to 19.63% from 17.97% for the devices with pure Spiro. Moreover, the operational stability of the PSCs with double-layered HTM of CuInS 2 /Spiro was enhanced. The PCE of the PSCs with CuInS 2 /Spiro retains 91% of the initial value after 30 days storage in ambient atmosphere. The experimental results indicate that the improved performance could be come from the energy band match between CuInS 2 and Spiro, fast hole extraction and transport, and decreased charge recombination in the PSCs with double-layered HTM of CuInS 2 /Spiro. This work provides a promising prospect to design a low-cost and high stability HTM for commercial PSCs.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Qing Sun,Meilin Ke,Yingjie Zhao,Bin Wang,Jian Zhang,Jiawei Sheng
Improving the ability of photocatalysts to capture and degrade dye pollutants is essential for the development of photocatalytic technology. Herein, a Bi 2 MoO 6 belt-like morphology with significantly enhanced visible light photocatalytic performance was obtained by solvent hydrothermal combining ethanol heat treatment technique. The Raman, FTIR, TEM, ESR, EIS and PL results demonstrate that the formation of defects on the {0 0 1} facet of BMO can effectively promote charge separation and prolong the life of optical carriers. The photocatalytic performance is evaluated by monitoring different concentrations RhB removal from aqueous solution and the results showed that defective Bi 2 MoO 6 nanobelts displayed 39 times and 60 times degradation rate than that of comparative conventional Bi 2 MoO 6 nanosheets and P25, respectively. In combination of controllable preparation process, excellent adsorption capacity and highly enhanced photocatalytic performance, this newly defective Bi 2 MoO 6 nanobelt might be a promising candidate for degradation of organic dyes in wastewater.
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Nanomaterials
·
2021
·Vol. 11
·期 4
·890
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IF 5.076
Yong Li,Qifeng Kuang,Xiaoling Men,Shenggang Wang,Da Li,Chuljin Choi,Zhidong Zhang
α″-Fe16N2nanomaterials with a shape anisotropy for high coercivity performance are of interest in potential applications such as rare-earth-free permanent magnets, which are difficult to synthesize in situ anisotropic growth. Here, we develop a new and facile one-pot microemulsion method with Fe(CO)5as the iron source and tetraethylenepentamine (TEPA) as the N/C source at low synthesis temperatures to fabricate carbon-coated tetragonal α″-Fe16N2nanocones. Magnetocrystalline anisotropy energy is suggested as the driving force for the anisotropic growth of α″-Fe16N2@C nanocones because the easy magnetization direction of tetragonal α″-Fe16N2nanocrystals is along the c axis. The α″-Fe16N2@C nanocones agglomerate to form a fan-like microstructure, in which the thin ends of nanocones direct to its center, due to the magnetostatic energy. The lengths of α″-Fe16N2@C nanocones are ~200 nm and the diameters vary from ~10 nm on one end to ~40 nm on the other end. Carbon shells with a thickness of 2–3 nm protect α″-Fe16N2nanocones from oxidation in air atmosphere. The α″-Fe16N2@C nanocones synthesized at 433 K show a room-temperature saturation magnetization of 82.6 emu/g and a coercive force of 320 Oe.Keywords:α″-Fe16N2;permanent magnetic material;one-dimensional nanocones;core/shell structure;anisotropic growth;chemical solution method
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Xianwen Li,Wensi Cai,Hongling Guan,Shuangyi Zhao,Siliang Cao,Chen Chen,Min Liu,Zhigang Zang
Owing to their superior optical and electronic properties, all inorganic metal halide CsPbX 3 (X = Cl, Br, and I) perovskite quantum dots (QDs) are regarded as excellent candidates for various optoelectronic applications. However, the instability of such materials greatly hampers their practical applications. In this work, silica-coated didodecyldimethylammonium bromide (DDAB) capped CsPbBr 3 QDs are prepared via a facile method at room temperature. The as-prepared DDAB-CsPbBr 3 /SiO 2 QDs composites demonstrate an effectively improved photoluminescence quantum yield (PLQY) and stability against ethanol and heat. Moreover, the green DDAB-CsPbBr 3 /SiO 2 QDs composites and red InAgZnS QDs are applied as color-converting layers on a blue LED chip for warm white light-emitting diodes (WLEDs). Such WLEDs exhibit an excellent luminescent performance with a color rendering index (CRI) of 88, a color coordinate of (0.41, 0.38), a correlated color temperature (CCT) of 3209 K, and a high power efficiency of 63.4 lm W −1 . Besides, such WLEDs are used for visible light communication (VLC), exhibiting a typical low-pass frequency response, with a corresponding −3 dB bandwidth of about 1.5 MHz. By applying orthogonal frequency division multiplexing (OFDM) with a bit loading, a maximum achievable rate of the VLC system reaches 5.9 Mbps, which is almost four times of their measured −3 dB bandwidth. These results demonstrate the potential of prepared DDAB-CsPbBr 3 /SiO 2 QDs composites not only in high-performance WLEDs, but also as an excitation light source to achieve VLC.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Qingyun He,Enrou Mei,Xiaojuan Liang,Weidong Xiang
Here, polyvinyl butyral (PVB) films-protected CsPbBr 3 /Cs 4 PbBr 6 halide perovskite solids (HPSs) were successfully synthesized. The optical properties and structure of HPSs@PVB were studied, finding the photoluminescence quantum yields (PLQYs) of this novel composite material is as high as 60.4%. More importantly, HPSs@PVB has excellent thermal cyclability, water and ultraviolet (UV) resistance. In addition, HPSs@PVB was further applied to light emitting diodes (LEDs) and displays. By combining green-emitting HPSs@PVB and red-emitting CsPbBrI 2 NCs@PVB with InGaN 460 nm blue chip, white light emitting diode (WLED) device can be successfully fabricated. And the device exhibits good stability and the color gamut is as wide as 126%, reaching 94% of Rec. 2020. This work proposes a simple approach to solve the challenging stability issue of perovskite nanocrystals (NCs), having a positive implication for their practical application in LEDs and display backlights.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shuang Zhou,Qiying Wang,Zhendong Xu,Shenke Xu,Peiyi Yang,Hao Deng,Bobo Li,Yifan Dong,Peigang Han,Yaorong Su
Exploring high performance photocatalysts is of great importance to relieve the environment pollution issues. In this paper, we introduce a facile antisolvent solvothermal method to synthesize methylammonium lead tribromide perovskite (MAPbBr 3 ) nanocrystals and successfully employ them as efficient photocatalysts. Compared to the room temperature synthesized MAPbBr 3 (RT-MAPbBr 3 ), the antisolvent solvothermal synthesized MAPbBr 3 (AS-MAPbBr 3 ) has multiple outstanding properties, such as improved crystallinity with lower grain boundary density, enhanced light absorption in visible range, suitable band gap of 2.31 eV and extended photoluminescence (PL) lifetime as long as 2627.82 ns. By taking advantages of the above merits, the AS-MAPbBr 3 exhibits efficient photocatalytic performance by decomposition of methyl orange under solar light. A high apparent rate constant of 101.2 × 10 −3 is achieved along with excellent cyclability, which significantly outperforms the RT-MAPbBr 3 (56.0 × 10 −3 ) and P25 (16.5 × 10 −3 ). The underlying mechanism for MO photocatalytic degradation is deeply explored and proposed. Our present study suggests that the antisolvent solvothermal method can be a promising method to synthesize perovskite nanocrystals, and might also provide some insights in developing a series of high performance perovskite based photocatalysts.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Xing-Zhou Lu,Chao Gu,Qi Zhang,Lei Shi,Shi-Kui Han,Guan-Ping Jin
Engineering nanoheterostructures (NHs) plays a key role in exploring novel or enhanced physicochemical properties of nanocrystals. Despite previously reported synthetic methodologies, selective synthesis of NHs to achieve the anticipated composition and interface is still challenging. Herein, we presented a colloidal strategy for the regioselective construction of typical Ag–Co2P NHs with precisely controlled location of Ag nanoparticles (NPs) on unique chemically transformed Co2P nanorods (NRs) by simply changing the ratio of different surfactants. As a proof-of-concept study, the constructed heterointerface-dependent hydrogen evolution reaction (HER) catalysis was demonstrated. The multiple Ag NP-tipped Co2P NRs exhibited the best HER performance, due to their more exposed active sites and the synergistic effect at the interfaces. Our results open up new avenues in rational design and fabrication of NHs with delicate control over the spatial distribution and interfaces between different components.
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