CHEMICAL PAPERS
·
2023
·Vol. 77
·期 8
·4633-4642
·
IF 2.2
Li Rongfa
Animated displays and fluorescent devices are researched for fashion media. In this work, perovskite nanocrystals (PNCs)/copolymer composite with high luminescent intensity and stability was prepared. Two composites bearing PNCs (various polymer matrices) were fabricated via drop-coating method. Micro-/nano-structure, crystallization, and light absorption/photoluminescence (PL) traits of PNCs were characterized. PNCs/poly(methyl methacrylate- co -butyl acrylate) (PMMA- co -PBA) composite shows a better film-forming property than PNCs/polymethyl methacrylate (PMMA) composite. PL-emission properties of PNCs/copolymer composite are comparable to PNCs, including the maintained emission wavelength (~ 521 nm) and narrow emission half-peak width. For high fluorescent stability after air/ultraviolet aging, PNCs/copolymer composite is superior to PNCs and PNCs/homopolymer composite. PNCs/copolymer composite shows a PL intensity of ~ 90% after air aging for 40 days (~ 80% after ultraviolet aging for 120 h). Luminescent film devices via PNCs/copolymer composite were studied, and effective green-/white-light emissions were achieved. The present white-light emission is close to the international standard. This work might enable a large-scale preparation of quantum dots/polymer composites for luminescent devices.
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ADVANCED MATERIALS
·
2023
·
IF 29.4
Ruixue Duan,Yueping Li,Ruru Zhang,Xuelan Hu,Yi wang,Jianfeng Zeng,Mingyuan Gao
Acute kidney injury (AKI) induced by ischemia reperfusion is closely related to mitochondrial dysfunction. Nicotinamide adenine dinucleotide (NAD + ) can enhance the mitochondrial function and restrain the following inflammation, but it is hardly delivered and lacks renal targeting ability. To address these problems, we herein use an ultra-small Fe 3 O 4 nanoparticle as a carrier to deliver nicotinamide mononucleotide (NMN), a precursor of NAD + . An outstanding sophistication of the current design is that once NMN is attached on the surface of Fe 3 O 4 nanoparticles through its phosphate group, the remaining part is structurally highly similar to nicotinamide riboside, which provides an opportunity to deliver the NAD + precursor into renal cells through nicotinamide riboside kinase 1 on cell membrane. It was demonstrated that NMN-loaded Fe 3 O 4 nanoparticles can effectively reverse AKI induced by ischemia reperfusion. In-depth studies indicated that a well-timed iron replenishment following anti-inflammation treatment plays a determined role in recovering AKI, which distinguishes the current study from previously strategies centering on anti-ROS (reactive oxygen species), anti-inflammation or even iron elimination. This article is protected by copyright. All rights reserved
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ACS Nano
·
2023
·
IF 17.1
Feng Han,Zhengdong Tu,Zhuang Zhu,Dachuan Liu,Qingchen Meng,Qifan Yu,Ying Wang,Jianquan Chen,Tao Liu,Fengxuan Han,Bin Li
The excessive reactive oxygen species (ROS) level, inflammation, and weak tissue regeneration ability after annulus fibrosus (AF) injury constitute an unfavorable microenvironment for AF repair. AF integrity is crucial for preventing disc herniation after discectomy; however, there is no effective way to repair the AF. Herein, a composite hydrogel integrating properties of antioxidant, anti-inflammation, and recruitment of AF cells is developed through adding mesoporous silica nanoparticles modified by ceria and transforming growth factor β3 (TGF-β3) to the hydrogels. The nanoparticle loaded gelatin methacrylate/hyaluronic acid methacrylate composite hydrogels eliminate ROS and induce anti-inflammatory M2 type macrophage polarization. The released TGF-β3 not only plays a role in recruiting AF cells but is also responsible for promoting extracellular matrix secretion. The composite hydrogels can be solidified in situ in the defect area to effectively repair AF in rats. The strategies targeting endogenous ROS removal and improving the regenerative microenvironment by the nanoparticle-loaded composite hydrogels have potential applications in AF repair and intervertebral disc herniation prevention.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chaojie Lyu,Chenyang Cao,Jiarun Cheng,Yuquan Yang,Kaili Wu,Jiwen Wu,Woon-Ming Lau,Ping Qian,Ning Wang,Jinlong Zheng
Transition-metal phosphides (TMPs) are regarded as the underlying substitutes to Pt-based catalysts for electrocatalytic hydrogen evolution reaction (HER), but the poor electrical conductivity and limited catalytic activity severely hinder its employment. Interface engineering is an available arrangement to enhance the catalytic activity of TMPs for HER process. The interface−engineered Ni 2 P/Ni 5 P 4 heterostructure porous nanosheets was developed by a simple solvothermal method and a controllable low−temperature phosphorization treatment. Combining UPS characterization with DOS simulation, we disclose the existence of built-in electric field at interface region, and the electrons is transferred from Ni 2 P to Ni 5 P 4 side. The DFT calculation results indicate that the active sites at interface domain possess the optimal H* adsorption free energy and lowest H 2 O dissociation energy barrier compared with single-phased Ni 2 P and Ni 5 P 4 , which is contributed to the electrons redistribution and electronic structure optimization, thereby enhancing the HER catalytic activity of Ni 2 P/Ni 5 P 4 heterostructure nanosheets. The experimental results show it exhibits excellent HER performance in universal pH range. It merely requires the overpotentials of 78, 100, and 62 mV to achieve 10 mA/cm 2 in 0.5 M H 2 SO 4 , 1 M PBS, and 1 M KOH electrolytes, respectively. Assembled with NiFeCH anode, we fabricated NiFeCH || Ni 2 P/Ni 5 P 4 electrolyzer, which only needs the voltage of 1.52 V to achieve current density of 10 mA/cm 2 in 1 M KOH. Even in complicated seawater system, the electrode and the electrolyzer still display outstanding electrocatalytic performance for hydrogen production. This report supplies an efficient strategy to enhance the electrolytic performance for hydrogen production from water splitting.
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Advanced Optical Materials
·
2023
·Vol. 11
·期 12
·2203125
·
IF 9
Qinxuan Cao,Ruyi Song,Christopher C. S. Chan,Zhiyu Wang,Pui Ying Wong,Kam Sing Wong,Volker Blum,Haipeng Lu
Chiral perovskite nanocrystals have emerged as an interesting chiral excitonic platform that combines both structural flexibility and superior optoelectronic properties. Despite several recent demonstrations of optical activity in various chiral perovskite nanocrystals, efficient circularly polarized luminescence (CPL) with tunable energies remains a challenge. The chirality imprinting mechanism as a function of perovskite nanocrystal dimensionality remains elusive. Here, atomically thin inorganic perovskite nanoplatelets (NPLs) are synthesized with precise control of layer thickness and are functionalized by chiral surface ligands, serving as a unique platform to probe the chirality transfer mechanism at the organic/perovskite interface. It is found that chirality is successfully imprinted into mono-, bi-, and tri-layer inorganic perovskite NPLs, exhibiting tunable circular dichroism (CD) and CPL responses. However, chirality transfer decreases in thicker NPLs, resulting in decreased CD and CPL dissymmetry factors for thicker NPLs. Aided by large-scale first-principles calculations, it is proposed that chirality transfer is mainly mediated through a surface distortion rather than a hybridization of electronic states, giving rise to symmetry breaking in the perovskite lattice and spin-split conduction bands. The findings described here provide an in-depth understanding of chirality transfer and design principles for distorted-surface perovskites for chiral photonic applications.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 7
·2151-2159
·
IF 5
Jiaojiao Fang,Chengyang Zhu,Yaru Ni,Chunhua Lu,Zhongzi Xu
Strong triplet–triplet annihilation upconversion (TTA-UC) of sub-bandgap photons is significant for the low-energy photon capture in photocatalytic technology. Herein, we report a strategy to enhance TTA-UC for achieving efficient photocatalysis, via the collaborative coupling of double local electromagnetic fields from the photonic band gap (PBG) and localized surface plasmon resonance (LSPR) effects. An upconversion–photocatalysis film was constructed by depositing CdS on a poly(vinylidenefluoride) inverse opal photonic crystal consisting of metal nanoparticles and platinum(II)-octaethylporphyrin & 9,10-diphenylanthracene. As a result of the synergism of double local electromagnetic fields, the TTA-UC fluorescence intensity is increased by 10.74 times at most with the highest quantum yield of 11.05%, which far surpasses that improved by the single action of different PBG and LSPR effects. Based on the TTA-UC process enhanced by the synergism, the upconversion–photocatalysis film exhibits a 3.29-fold and 5.25-fold increase in the photocatalytic degradation rate of organic compounds under visible and green light, respectively. This work offers a distinctive way to fortify the TTA-UC fluorescence for efficient photocatalysis.
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Advanced Optical Materials
·
2022
·Vol. 11
·期 3
·2201939
·
IF 10.05
Yajun Lou,Pengfei He,Boyuan Ge,Xijian Duan,Lei Hu,Xiaoli Zhang,Lili Tao,Xinhai Zhang
In this study, red light emitting InP/ZnSeS/ZnS quantum dots (QDs) are prepared by thermal injection method. The results show that the InP/ZnSeS/ZnS QDs saturable absorbers (SA) have good nonlinear saturable absorption properties with modulation depth of 24.2% and saturation intensity of 0.08 KW cm −2 . Then the QD SAs are applied to the erbium-doped fiber laser (EDFL) ring cavity system, and a mode-locked laser pulse with a pulse width of 635 fs is generated. In addition, the pulse width is determined by the carrier recovery time, which is closely related to the defect density in the material. A large number of defects are eliminated in the QDs by hydrogen fluoride (HF) treatment, and the pulse width is reduced from 635 to 450 fs. Results of time-resolved photoluminescence and ultrafast transient absorption spectroscopy (TAS) show that HF treatment indeed reduces defects in InP/ZnSeS/ZnS QDs, indicated by the decrease of the carrier recovery time. This is different from the reported 2D SA materials, which usually reduce the carrier recovery time by increasing the defect density. This study will inspire new applications of QDs in ultrafast photonics and nonlinear optics.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Mingcong Gao,Jiawei Li,Lei Qiu,Xinyi Xia,Xia Cheng,Feifei Xu,Guanhong Xu,Fangdi Wei,Jing Yang,Qin Hu,Yao Cen
Perovskite quantum dots (PQDs) are extremely unstable in ambient air due to their inherent structural instability, which limits the wide application of PQDs. In this work, silicon-coated CsPbBr 3 PQDs (CsPbBr 3 @SiO 2 ) was synthesized via a simple method. The SiO 2 coating effectively isolated PQDs from water and oxygen in the environment, which were the main elements that destroyed the structure stability of PQDs. The synthesized CsPbBr 3 @SiO 2 can be stored in water for more than 2 months and posessed wonderful dispersibility in aqueous solution. The fluorescence intensity remained unchanged within 7 days and only decreased by 11.9 % within 2 months. We found that CsPbBr 3 @SiO 2 was extremely sensitive to environmental pH, and the fluorescence intensity decreased with the reduction of pH. In addition, an excellent linear relationship with pH value in the range of 1.0 ∼ 5.0 was achieved. As we all known that glucose can be catalyzed by glucose oxidase to produce gluconic acid and hydrogen peroxide, in which a good deal of protons were produced and the pH was gradually lowered. Since CsPbBr 3 @SiO 2 was stable to water and oxygen, and sensitive to ambient pH, we applied CsPbBr 3 @SiO 2 to the detection of glucose. CsPbBr 3 @SiO 2 showed fantastic selectivity and sensitivity to glucose, and the detection limit can even reach 18.5 μM. Furthermore, CsPbBr 3 @SiO 2 was successfully applied to the detection of glucose in the human serum with satisfactory performance.
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Nanomaterials
·
2022
·Vol. 12
·期 23
·4300
·
IF 5.719
Ruixiang Wu,Xiaoshuai Wang,Jingjing Luo,Xin Liu,Fengjie Guo,Bin Li,Shengzhi Wang,Peigeng Han,Xiangyang Miao
Combining steady-state photoluminescence and transient absorption (TA) spectroscopy, we have investigated the photoinduced charge transfer dynamics between lead-free Mn-doped Cs2NaIn0.75Bi0.25Cl6double perovskite (DP) nanocrystals (NCs) and conjugated poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV). Upon ultraviolet-A excitation, the photoinduced absorption feature of DP NCs/MDMO-PPV nanocomposites disappeared, and the stimulated emission weakened in the TA spectrum. This was due to charge transfer from the MDMO-PPV polymers to DP NCs. Upon a higher photon-energy ultraviolet-C excitation, stimulated emission and photoinduced absorption features vanished, indicating there existed a reversible charge transfer from DP NCs to MDMO-PPV polymers. Reversible charge transfer of Mn-doped DP NCs/MDMO-PPV nanocomposites was tuned by varying the excitation photon-energy. The manipulation of reversible charge transfer dynamics in the perovskite-polymer nanocomposites opens a new avenue for optical and optoelectronic applications.Keywords:transient absorption spectroscopy;reversible charge transfer;lead-free double perovskite;conjugated polymer;nanocomposites
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OPTICS EXPRESS
·
2022
·Vol. 30
·期 25
·45376-45392
·
IF 3.833
Longshi Rao,Longshi Rao,Bin Sun,Bin Sun,Qing Zhang,Qing Zhang,Mingfu Wen,Mingfu Wen,Jiayang Zhang,Jiayang Zhang,Guisheng Zhong,Guisheng Zhong,Guisheng Zhong,Ting Fu,Xiaodong Niu,Xiaodong Niu,Yong Tang
Benefit from their near-unity photoluminescence quantum yield (PL QY), narrow emission band, and widely tunable bandgap, metal halide perovskites have shown promising in light-emitting applications. Despite such promise, how to facile, environmentally-friendly, and large-scale prepare solid metal halide perovskite with high emission and stability remains a challenging. Herein, we demonstrate a convenient and environmentally-friendly method for the mass synthesis of solid CsPbBr3/Cs4PbBr6 composites using high-power ultrasonication. Adjusting key experimental parameters, bright emitting CsPbBr3/Cs4PbBr6 solids with a maximum PL QY of 71% were obtained within 30 min. XRD, SEM, TEM, Abs/PL, XPS, and lifetime characterizations provide solid evidence for forming CsPbBr3/Cs4PbBr6 composites. Taking advantage of these composites, the photostability, thermostability, and polar solvent stability of CsPbBr3/Cs4PbBr6 are much improved compared to CsPbBr3. We further demonstrated CsPbBr3/Cs4PbBr6 use in flexible/stretchable film and high-power WLEDs. After being subjected to bending, folding, and twisting, the film retains its bright emission and exhibits good resistance to mechanical deformation. Additionally, our WLEDs display a superior, durable high-power-driving capability, operating currents up to 300 mA and maintaining high luminous intensity for 50 hours. Such highly emissive and stable metal halide perovskites make them promising for solid-state lighting, lasing, and flexible/stretchable display device applications.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-16
·
IF 17.694
Li Fangyuan,Sun Heng,Ren Jiafeng,Zhang Bo,Hu Xi,Fang Chunyan,Lee Jiyoung,Gu Hongzhou,Ling Daishun
Platinum (Pt) resistance in cancer almost inevitably occurs during clinical Pt-based chemotherapy. The spontaneous nucleotide-excision repair of cancer cells is a representative process that leads to Pt resistance, which involves the local DNA bending to facilitate the recruitment of nucleotide-excision repair proteins and subsequent elimination of Pt-DNA adducts. By exploiting the structural vulnerability of this process, we herein report a nuclease-mimetic Pt nanozyme that can target cancer cell nuclei and induce concurrent DNA platination and oxidative cleavage to overcome Pt drug resistance. We show that the Pt nanozyme, unlike cisplatin and conventional Pt nanoparticles, specifically induces the nanozyme-catalyzed cleavage of the formed Pt-DNA adducts by generating in situ reactive oxygen species, which impairs the damage recognition factors-induced DNA bending prerequisite for nucleotide-excision repair. The recruitment of downstream effectors of nucleotide-excision repair to DNA lesion sites, including xeroderma pigmentosum groups A and F, is disrupted by the Pt nanozyme in cisplatin-resistant cancer cells, allowing excessive accumulation of the Pt-DNA adducts for highly efficient cancer therapy. Our study highlights the potential benefits of applying enzymatic activities to the use of the Pt nanomedicines, providing a paradigm shift in DNA damaging chemotherapy.
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ADVANCED MATERIALS
·
2022
·Vol. 35
·期 6
·2208735
·
IF 32.086
Xiaowei Yu,Kaikai Liu,Bolun Wang,Hongyue Zhang,Yuanyuan Qi,Jihong Yu
Luminescence multiplexing shows promising application prospects in information security, yet even outstanding time division multiplexing can only carry limited luminescence information. Time–space division multiplexing can greatly expand the information capacity by simultaneously transferring luminescence information in both time and space dimensions. Herein, time-dependent polychrome stereoscopic luminescence system has been successfully developed by designing a 3D luminescence system based on resonance energy transfer (RET), in which afterglow lifetime easily regulated carbon dots-in-zeolite composites are used as energy donors and multicolor fluorescence quantum dots (QDs) as energy acceptors. Taking perovskite QDs (PeQDs) as example, by matching the energy donors with different afterglow lifetimes and the energy acceptors with different fluorescence colors, tunable afterglow emission of PeQDs with wavelength within 463–614 nm and lifetime within 232–1500 ms can be realized, in which the maximal RET efficiency reaches 95%. As a proof of concept, such novel luminescence system that carries eight layers of luminescence information involving four dimensions (time and 3D space) is successfully applied in advanced time–space division multiplexing. This work opens a new perspective for the application of time-space integrated luminescence systems in advanced information multiplexing.
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