Journal of Materials Chemistry C
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2019
·Vol. 8
·期 4
·1413-1420
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IF 6.641
Yiqin Gong,Jianhua Shen,Yihua Zhu,Xiaoling Yang,Ling Zhang,Chunzhong Li
Halide perovskites are promising materials for optoelectronic applications, but simultaneously achieving high performance and long-term stability is still challenging. Here, we incorporate organosilicon-coated CsPbBr3 quantum dots into polydimethylsiloxane (PDMS) to prepare stretchable and photoluminescent polymer composites. The modified ligand 3-aminopropyltriethoxysilane with glutaric anhydride (APTES-GA) improves the thermal stability of CsPbBr3 QDs and enhances the interfacial bonding between PDMS and QDs. The composites achieve 95.5% absolute photoluminescence quantum yields (PLQY) after 125 °C heat treatment. The double robust organosilicon protective layers protect the QDs from polar solvents and prevent anion exchange as well. More importantly, photoluminescence enhancement is discovered during the elongation process. This novel phenomenon results from the elimination of emission reabsorption among QDs, which may open up a brand-new field for the applications of halide perovskite QDs.
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ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Jiaojiao Fang,Cihui Zhou,Yukai Chen,Liang Fang,Wei Wang,Cheng Zhu,Yaru Ni,Chunhua Lu
To avoid secondary environmental pollution caused by photocatalysts in their applications, our work offers a new strategy for fabricating photocatalytic films based on plasmon-enhanced triplet–triplet annihilation upconversion (TTA-UC). Polydimethylsiloxane (PDMS) films containing platinum (II)-octaethylporphyrin and 9,10-diphenylanthracene (PtDPAP), and gold nanoparticles (AuNPs) were prepared. While graphene (G) was used as an adhesive and conductive layer, CdS nanoparticles were deposited onto the films (AuNPs-PtDPAP/G/CdS) by plasma glow discharge pretreatment. The AuNPs-PtDPAP film had an enhancement in the green-to-blue upconversion compared with the pristine PtDPAP film. CdS can utilize the AuNPs plasmon-enhanced TTA-UC photons to realize efficient photocatalytic reactions. The pseudo-first-order rate constant (kpfo) of the optimized active and stable photocatalytic film, 0.3 AuNPs-PtDPAP/G/CdS, reached 0.294 h–1 for tetracycline degradation under green light irradiation. Its kpfo in decomposing tetracycline under visible light is 2.62 times higher than that of the PtDPAP/G/CdS. The reported composite films provide a strategy to improve the photocatalytic activity and promote the practical applications of nanosize photocatalysts.
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高影响因子
RSC Advances
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2019
·Vol. 9
·期 69
·40546-40552
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IF 3.049
Zhiming Chen,Jiaojiao Song,Qingpeng Zhu,Zhiguo Li,Renchun Yang
Core–shell magnetic Fe3O4@PVBC–TMT (Fe3O4@polyvinylbenzyl chloride–trithiocyanuric acid) nanoparticles containing trithiocyanuric acid groups were fabricated and employed for the fast removal of heavy metals from an aquatic environment. The morphology, structure and properties of Fe3O4@PVBC–TMT nanoparticles were characterized by a series of modern analytical tools. The adsorption behavior of the Fe3O4@PVBC–TMT nanoparticles for heavy metals ions in aqueous solutions was investigated by batch experiments. The maximum removal capacities of the Fe3O4@PVBC–TMT nanoparticles toward Mn2+, Ni2+, Cu2+, Cd2+ and Pb2+ ions were 127.4, 146.6, 180.5, 311.5, and 528.8 mg g−1, respectively. Importantly, it is found that Pb2+ ions can be completely and quickly removed by the Fe3O4@PVBC–TMT nanoparticles. The equilibrium was established within 6 min, and the removal efficiencies were found to be 99.9%, 99.8% and 99.5% for Pb2+ ions at the initial concentrations of 100 mg L−1, 200 mg L−1 and 300 mg L−1, respectively. It is hoped that the core–shell magnetic Fe3O4@PVBC–TMT nanoparticles may find application in wastewater treatment.
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JOURNAL OF LUMINESCENCE
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2019
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IF 2.961
Zhihai Wu,Pan Wang,Jun Wu,Jiao Wei,Yanni Sun,Nengping Wang,Zhenfu Zhao
Recently, all-inorganic perovskite (CsPbX 3 (X = Cl, Br, I)) nanocrystals (NCs) have caused extensive attention due to their high photoluminescence quantum yield (PL QY), high color purity, and narrow full width at half maximum (FWHM). Although the excellent optical properties of perovskite NCs (PNCs) endow them good application prospects, their inherent instability severely limits the commercialization process. In this paper, highly-luminescence and ultra-stable phosphor were obtained by loading PNCs onto the surface of amino modified hexagonal boron-nitride (h-BN) white graphene (PNCs-BNWG), This structural design can effectively suppress the attenuation of photoluminescence (PL) intensity and enhance thermal stability, thereby realizing the high stability and brightness white LEDs. The synthesis process is simple and can be finished in a few minutes to ensure scalable production. Compared with bare PNCs, it can maintain excellent optical properties. The high PL QY and thermal stability mainly stem from the isolation effect that separates PNCs from each other on the surface of BNWG and their superior high transparency as well as thermal conductivity . In addition, multi-color inks are produced by dispersing PNCs-BNWG nanocomposites in PDMS to form a multicolor painting demonstrating high PL QY and wide color gamut.
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ACS Applied Nano Materials
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2019
·
IF 0
Hongxiang Zhang,Chunxia Wu,Canran Zhang,Bisheng Yan,Jiyuan Guo,Gangyi Zhu,Jun Dai
In this paper, we report the dual-wavelength green-light emission from zinc oxide (ZnO)-nanoseed-decorated p-GaN (gallium nitride)/n-ZnO nanorod/CsPbBr3 quantum dots (QDs) light-emitting diodes (LEDs). At the same time, the effect of ZnO nanoseeds on the p-GaN/n-ZnO nanorod/CsPbBr3 QDs LED performance is deeply studied. ZnO nanoseeds were fabricated by magnetron sputtering and the sol–gel method; then ZnO nanorods were obtained on GaN by hydrothermal treatment to form the p-GaN/n-ZnO nanorod heterojunction, and green CsPbBr3 QDs were further deposited on ZnO nanorod arrays to realize LEDs. The results show that magnetron-sputtering ZnO nanoseeds can induce regular vertical ZnO nanorod arrays, and the corresponding device presents a better electroluminescence (EL) performance. The X-ray diffraction, atomic force microscopy, and EL mechanisms indicate that the p-GaN/n-ZnO nanorod with magnetron-sputtering ZnO nanoseeds has a better crystalline interface. Our results indicate that the p-GaN/n-ZnO nanorod/CsPbBr3 QDs heterojunction structure can be served as dual-wavelength LEDs, and magnetron-sputtering ZnO nanoseeds can give rise to a better EL performance.
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BIOMATERIALS
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2019
·
IF 10.273
Meng Lyu,Daoming Zhu,Yanhong Duo,Yang Li,Hong Quan
Hypoxic tumor microenvironment leads to resistance or failure of radiotherapy (RT). As a non-invasive therapy, photothermal therapy (PTT) can improve the tumor hypoxic microenvironment in addition to directly killing tumor cells. PTT combined with RT (thermoradiotherapy) becomes an emerging treatment. Multi-functional nanoparticles used for hypoxia-resistant thermoradiotherapy in the second near-infrared (NIR-II) biological windows (1000–1700 nm) are urgently needed to be developed. Here, a facil method synthesis of ultra-small cysteamine (Cys)-coated FePd bimetallic nanodots (NDs) is reported. These NDs can not only produce effective hyperthermia (35.4%) when irradiated in the NIR-II region (1064 nm) but also have an enhanced radiation effect due to i) Hypoxic improvement in tumor tissues by photothermal treatment in the NIR-II Biological Windows can greatly enhance the sensitivity of tumor cells to radiotherapy ii) The ability of NDs to deposit radiation energy in tumors has further enhanced the sensitivity of tumor cells to radiotherapy. Meanwhile, NDs was a contrast agent for tri-modal imaging including computed tomography (CT)/magnetic resonance imaging (MRI)/photoacoustic imaging (PAI) in vitro and in vivo . Both in vitro and in vivo tests demonstrated good biocompatibility and excellent stability of NDs, indicating great potential for clinical applications.
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高影响因子
Frontiers in Materials
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2019
·
IF 2.689
Liu Min,Li Zhichun,Zheng Weilin,Kong Long,Li Liang
Metal oxides exhibit excellent barrier properties against moisture and oxygen, which are regarded as the powerful candidate for boosting the stability of perovskite nanocrystals (NCs). Here, we develop a simple method to coat perovskite NCs with PbO by peroxides post-treatment. Firstly, the didodecyl dimethyl ammonium sulfide (DDAS) was used to modify the CsPbBr3 NCs (DDAS-CsPbBr3), and then sequentially treated with benzoyl peroxide (BPO). By this way, the self-metal source (lead) can be easily oxidized, leading to the quick growth of lead oxide (PbO) on the surface of individual CsPbBr3 NCs. Under illumination with a 450 nm LED light (175 mW/cm2), the PbO coated CsPbBr3 NCs maintained at ~90% of the initial intensity for 20 h of operations; in contrast, the emission from the CsPbBr3 NCs completely quenched.
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RSC Advances
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2019
·Vol. 9
·期 67
·39315-39322
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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.
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Journal of Cleaner Production
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2019
·
IF 6.395
Xiaoxiao Qian,Zhi Chen,Xiuru Yang,Wan Zhao,Chunxi Liu,Tao Sun,Dantong Zhou,Qian Yang,Guoying Wei,Meiqiang Fan
The efficient removal of antibiotic residues has drawn wide interests; however, little attention has been focused on treating them in organic system. Inorganic perovskite cesium lead bromide quantum dots were successfully prepared by anti-solvent precipitation and the prepared cesium lead bromide quantum dots were well-characterized. The photocatalytic activity was evaluated by degradation of tetracycline hydrochloride in ethanol as a model reactant under visible light for the first time. 76% tetracycline hydrochloride and 70% methyl orange were efficiently degraded in 30 min, which illustrate cesium lead bromide quantum dots could work as efficient photocatalyst for the degradation of organic pollutants in ethanol. The photoelectric conversion efficiency and photoluminescence quantum yields were measured and calculated. The photodegradation process was systematically analyzed by full-wavelength absorption. It is found that superoxide radicals may play a major role in the photocatalytic degradation process by capture experiments and the reaction mechanism has been proposed. Cesium lead bromide is not stable in water and may be converted into perovskite-related phase with water, which will result in the loss of photocatalytic activity. This work indicates that cesium lead bromide may act as an efficient photocatalyst for the removal of tetracycline hydrochloride and methyl orange in organic system, which may benefit the development/application of novel photocatalysts for special applications.
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ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Zhe Li,Qi Kang,Lu Chen,Bin Zhang,Guizheng Zou,Dazhong Shen
The poor aqueous stability of perovskite nanocrystals (NCs) limits their electrochemical applications. Herein, we reported a waterproof and conductive silica gel shell encapsulating CsPbBr 3 NCs, enhancing its aqueous stability and radiative-charge-transfer efficiency. Upon introducing small volume of CsBr aqueous solution in hexane containing tetramethoxysilane (TMOS) and Cs 4 PbBr 6 NCs, the conversion reaction of Cs 4 PbBr 6 → CsPbBr 3 +3CsBr was triggered to form Cs 4 PbBr 6 @CsPbBr 3 @silica gel (CsBr) hybrid. The silica gel shell can block the contact between CsPbBr 3 NCs and bulk aqueous phase. The CsBr enclosed in the silica gel can reduce the conversion rate and increase dramatically the electrical conductivity of the silica gel. The electrochemiluminescence (ECL) of CsPbBr 3 NCs in aqueous phase was enhanced greatly. The strong ECL of CsPbBr 3 NCs in the hybrid was still observed after stored in CsBr solution for 30 day. The as-obtained perovskite hybrid displays improved electrochemical charge-injecting performance and radiative-charge-transfer in ECL. Annihilation ECL demonstrates that all the electrons injected onto the perovskite hybrid can recombine with the holes injected onto it for light-emitting. Both annihilation and co-reactant ECL, as well as photoluminescence reveal that encapsulating CsPbBr 3 NCs into a conductive and waterproof silica gel shell is favorable to enhance aqueous performance of perovskite NCs with negligible effects on their excited states. The ECL of the core-shell perovskite hybrid was applied to detect dopamine in the concentration range of 0.01–10 μM, with the limit of detection of 3 nM.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Fei Gao,Yangping Zhang,Tongxin Song,Cheng Wang,Chunyan Chen,Jin Wang,Jun Guo,Yukou Du
The development of high-performance catalysts is of great importance in direct alcohol fuel cells. One dimensional nanorods catalysts are hopeful candidates as efficient alcohol electrocatalysis. However, it is desirable to precisely modulate the surface morphology of one dimensional nanorods nanocrystals to acquire better catalytic property. We effectively integrate properties of robust one dimensional nanorods, core@shell structure, and ternary nanoalloy into a new PtNiPd@Pt core@shell nanorods with high density bumps on the surface for potential better catalytic behaviors. Notably, those unique structures make the PtNiPd@Pt nanocrystals display favorable electrocatalytic performance towards methanol oxidation reaction. Specifically, the composition-optimized PtNi 0.20 Pd 0.52 nanorods exhibit the highest methanol oxidation reaction specific activity of 18.01 mA cm −2 among PtNiPd@Pt catalysts in alkaline condition. The specific activity is 8.5 times higher than that of Pt/C catalysts. Moreover, electrochemical stability measurements also confirm the better reaction endurance of PtNi 0.20 Pd 0.52 nanorods. Our work provides a reference to well tune the fine surface structure on one dimensional nanorods catalysts in the direction of superior electrocatalytic behaviors.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 30
·期 4
·1907954
·
IF 15.621
Xiaoyan Zhong,Xianwen Wang,Liang Cheng,Yong'an Tang,Guiting Zhan,Fei Gong,Rui Zhang,Jun Hu,Zhuang Liu,Xiangliang Yang
The ultrahigh concentration of glutathione (GSH) inside tumors destroys reactive oxygen species (ROS)-based therapy, improving the outcome of chemodynamic therapy (CDT)-enhanced sonodynamic therapy (SDT) by depleting GSH is full of great challenge. Herein, PtCu 3 nanocages are first reported as acting as a sonosensitizer with highly efficient ROS generation under ultrasound irradiation. In addition, PtCu 3 nanocages can act as horseradish peroxidase-like nanozymes, catalyzing the decomposition of H 2 O 2 into • OH under acidic conditions for CDT. Surprisingly, PtCu 3 nanocages can act as another kind of nanozyme, mimicking glutathione peroxidase (GSH-Px), which plays an important role in accelerating GSH depletion by oxidizing molecules, further weakening the capacity of tumor cells scavenging ROS by GSH. Both in vitro and in vivo studies demonstrate that PtCu 3 nanocages perform well in reducing GSH level for CDT-enhanced SDT. Moreover, utilizing the high absorption in the near-infrared region and strong X-ray attenuation ability, the PtCu 3 nanocages are able to conduct photoacoustic/computed tomography dual-modal imaging-guided combined cancer therapy. It is worth mentioning that PtCu 3 nanocages cause minimal toxicity to normal tissues at therapeutic doses. This work highlights the use of PtCu 3 nanocages for effective CDT-enhanced SDT via GSH depletion.
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