NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 20
·9771-9778
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IF 3.3
Qin Zhang,Fang Guo,Run-Chi Zhao,Zhi-Hong Mo
Metal halide perovskite nanocrystals (PNCs) exhibiting excellent optoelectronic properties have been commonly synthesized by the ligand-assisted reprecipitation (LARP) method. However, the application of the LARP method for the large-scale production of PNCs is greatly hindered by the heavy use of the toxic antisolvent toluene and alkylamine ligand. In this study, ethanol was used as the antisolvent to synthesize CsPbBr3 PNCs at room temperature, which was enabled by simply using cyclodextrin (α-CD) as the ligand. The proposed method could produce α-CD@CsPbBr3 PNCs with a size of 35.0 ± 0.6 nm, a photoluminescence quantum efficiency of 86.0 ± 0.1%, and a yield of 33.4 ± 0.6% (5 batches). In addition, the obtained α-CD@CsPbBr3 PNCs could persist for 6 months in ethanol with a loss of luminescence of less than 10%. The effective generation, high reproducibility, and long-term stability of the PNCs were contributed from the strong interaction between α-CD and CsPbBr3 and the poor solubility of α-CD in ethanol, which resulted in a firm enclosing of CsPbBr3 crystals within α-CD molecules. Additionally, the anion exchanges of the α-CD@PNCs were rapidly achieved in ethanol by using common salts of KI and NaCl. Using a non-toxic and low-cost antisolvent and ligand, this method is more eco-friendly and economical than ever.
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CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Longshi Rao,Yong Tang,Cunjiang Song,Ke Xu,Evan Thomas Vickers,Sara Bonabi Naghadeh,Xinrui Ding,Zongtao Li,Jin Z. Zhang
In this work, we report a polar-solvent-free, low-cost, and environmentally friendly method for synthesizing highly stable all-inorganic CsPbBr3 nanocrystals (NCs). Their shape and size are controlled by adjusting key parameters in the synthesis, such as capping ligands as well as ultrasound power and radiation time. The CsPbBr3 NCs are tunable from three-dimensional to two-dimensional and finally to 0-dimensional, by controlling the ratios and types of capping ligands. The CsPbBr3 NCs exhibit optical properties dependent on their shape and size, with photoluminescence quantum yield as high as 83%. Moreover, the role of nonpolar solvents in improving the stability of the CsPbBr3 NCs and the mechanism for the tunable growth of CsPbBr3 NCs are studied and discussed. Controlled shape and size of perovskite NCs are desired for applications, including solar cells, lasers, light-emitting diodes, and solar concentrators.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yanyan Zhao,Yongbo Wang,Xuhua Liang,Huanxian Shi,Cunjin Wang,Jun Fan,Xiaoyun Hu,Enzhou Liu
A visible-light-induced antibiotics degradation system based on a nano-Ag, CsPbBr 3 quantum dot (QDs) and bulk g-C 3 N 4 (CN) ternary assembly (Ag-CsPbBr 3 /CN) has been firstly constructed under an organic phase environment, oleylamine (OLA) and oleic acid (OA) were used as surfactants to stabilize the CsPbBr 3 , l -cysteine was used to facilitate the interaction between nano-Ag, CsPbBr 3 and CN. The new ternary assembly of Ag-CsPbBr 3 /CN composite was used to degrade 7-aminocephalosporanic acid (7-ACA) under visible light irradiation, and the 7%-Ag-CsPbBr 3 /CN composite displayed the superior photocatalytic activity, approximately 92.79% of 7-ACA has been degraded to CO 2 , H 2 O and other small molecules at 140 min, which was approximately 1.49-folds, 1.56-folds, 3.01-folds and 11.43-folds higher than 9%-CsPbBr 3 /CN, 7%-Ag/CN, pure CN and pure CsPbBr 3 , respectively. A possible mechanism for 7-ACA degradation over Ag-CsPbBr 3 /CN composite were proposed according to detailed measurements of adsorption test, Brunauer-Emmett-Teller (BET) measurement, UV–vis diffuse reflectance spectra (DRS), photoluminescence spectra (PL), transient photocurrent response and electrochemical impedance spectroscopy (EIS) measurement, and the enhanced photocatalytic activity of Ag-CsPbBr 3 /CN composite could be attributed to the excellent adsorbability, the enhanced light-harvesting and reduced charge recombination, as well as the synergistic effects of nano-Ag and CsPbBr 3 co-loaded with CN. In addition, Holes (h + ) and hydroxyl radicals ( OH) played major roles, electronic (e − ) and superoxide radical ( O 2 -) played minor roles based on the reactive-species-trapping experiments, the NBT transformation and the 7-hydroxycoumarin fluorescent experiments. Furthermore, a possible 7-ACA degradation pathway was investigated based on the Liquid Chromatography-Mass spectroscopy (LC-MS) experiment to better understand the degradation process. The present opens up a new insight for using CsPbBr 3 as photocatalyst to degrade antibiotics.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Shipeng Wan,Man Ou,Qin Zhong,Xinming Wang
Base-on the excellent optoelectronic properties, perovskite CsPbBr 3 quantum dots (QDs) have been used on perovskite solar cells and LED devices, but little research has been focused on photochemical CO 2 reduction due to their poor moisture stability. Coincidentally, metal-organic frameworks (MOFs) materials have received tremendous attention for sustainable clean energy and environmental remediation. However, the design of excellent performed MOFs is still indispensable. Therefore, the CsPbBr 3 QDs/UiO-66(NH 2 ) nanocomposites that combine the advantages of CsPbBr 3 QDs and UiO-66(NH 2 ) have been successfully designed and fabricated for the first time. Then we employ the nanocomposites as photocatalysts to convert CO 2 to chemical fuels in nonaqueous media. The resultant nanocomposites exhibit significantly improved photocatalytic activity for CO 2 reduction. When CsPbBr 3 QDs content is 15 wt%, the amount of CO can reach 98.57 μmol·g −1 . The remarkable photocatalytic performance could be ascribed to the improved electron extraction and transfer between UiO-66(NH 2 ) and CsPbBr 3 QDs, large accessible specific surface area and enhanced visible light absorption capacity. Moreover, the nanojunction shows excellent reusability for photocatalytic CO 2 reduction. This work might supply new pathway to utilize halide perovskite QDs/MOF nanocomposite in energy conversion and environmental remediation.
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Science China-Materials
·
2024
·Vol. 67
·期 7
·2246-2255
·
IF 6.8
Dai Yan,Chen Gengxu,Huang Weilong,Xu Chenhui,Liu Changfei,Huang Ziyu,Guo Tailiang,Chen Huipeng
Artificial photonic synapses offer an efficient solution for overcoming the von Neumann bottleneck in data storage and processing, providing advantages over electrical synapses by eliminating the bandwidth-connection-density tradeoff and exhibiting low power consumption. Perovskite quantum dots (QDs) have garnered significant attention in artificial photonic synapses due to their facile synthesis and favorable optoelectronic properties. However, challenges such as limited carrier mobility and nonlinearity impede their performance in neuromorphic applications. In this study, CsPbBr 3 -attached MXene nanostructures (CsPbBr 3 -MXene), in-situ growth of CsPbBr 3 QDs on MXene nanosheets, were proposed as the light-absorbing layer of a synaptic phototransistor. The heterostructure formed by CsPbBr 3 and MXene enhances photocurrent generation. Comparative analyses between CsPbBr 3 -MXene synapse transistor and that containing only CsPbBr 3 revealed a 24.6% higher excitatory postsynaptic current (EPSC) in the CsPbBr 3 -MXene one under identical light pulse stimulation. Following calculations and comparisons, the linearity exhibited significant improvement, decreasing from 4.586 to 1.099. Furthermore, the recognition accuracy in handwritten digit classification notably increased, rising from 86.13% to 92.05%. Moreover, the F1 score in edge detection had improvement, advancing from 0.8165 to 0.9065, approaching closer to 1. These improvements have demonstrated substantial assistance in the field of neural computing.
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JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Bo Li,Yanan Zhang,Luyuan Zhang,Longwei Yin
Inorganic CsPbBr 3 perovskite is arousing great interest following after organic-inorganic hybrid halide perovskites, and is found as a good candidate for photovoltaic devices for its prominent photoelectric property and stability. Herein, we for the first time report on PbCl 2 -tuned inorganic Cl-doped CsPbBr 3 (Cl) perovskite solar cells with adjustable crystal structure and Cl doping for enhanced carrier lifetime, extraction rate and photovoltaic performance . The effect of PbCl 2 on the morphologies, structures, optical, and photovoltaic performance of CsPbBr 3 perovskite solar cells is investigated systemically. Compared with orthorhombic CsPbBr 3 , cubic CsPbBr 3 demonstrates a significant improvement for electron lifetime (from 6.7 ns to 12.3 ns) and diffusion length (from 69 nm to 197 nm), as well as the enhanced electron extraction rate from CsPbBr 3 to TiO 2 . More importantly, Cl doping benefits the further enhancement of carrier lifetime (14.3 ns) and diffusion length (208 nm). The Cl doped cubic CsPbBr 3 (Cl) perovskite solar cell exhibits a J sc of 8.47 mA cm −2 and a PCE of 6.21%, superior to that of pure orthorhombic CsPbBr 3 (6.22 mA cm −2 and 3.78%). The improvement of photovoltaic performance can be attributed to enhanced carrier lifetime, diffusion length and extraction rates, as well as suppressed nonradiative recombination.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Wenqiang Liu,Zitong Qi,Tuanning Liu,Yang Zhang
Inorganic halide perovskite nanocrystals (NCs) are regarded as promising emitters for light-emitting diodes due to their bright and narrow emission. However, surface defects often result in trap states and ion migration, which remains a huge challenge for high-quality perovskite NCs. Herein, fluoride ions are introduced into CsPbBr3 perovskite NCs at room temperature through the chelation of ligands. Experimental results demonstrate that these fluoride ions from inorganic salts can improve the average lifetime and crystallinity of CsPbBr3 NCs. Meanwhile, the resulting photoluminescence quantum yield is optimized up to 99.02%, and it has high stability to water, heat, and ultraviolet light. Density functional theory calculations show that fluoride ions have a higher binding energy compared to other ligands, which not only removes the electron trapping center but also increases the halogen ion migration energy. By mixing green-emission CsPbBr3 NCs and red-emission K2SiF6:Mn4+ phosphors on a blue chip, the fabricated white light emitting diode shows a high luminous efficiency of 147.8 lm/W, a wide color gamut (129% for NTSC), and CIE coordinates of (0.3160, 0.3051). Furthermore, the photoluminescence intensity decreased by only 2.9% after 48 h of continuous operation.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 34
·2400817
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IF 18.5
Zhuangjie Xu,He Xi,Xue Sun,Hongjie Liu,Jiaxin Liu,Yanshuang Ba,Dandan Chen,Guodong Zhang,Chunfu Zhang,Xiaohua Ma,Yue Hao
Metal halide perovskite (MHP) single crystals have shown great potential for high-performance X-ray detection due to their excellent carrier transport properties, tunable optical bandgap, and low-temperature fabrication process. However, 3D perovskite single crystals suffer from severe ion migration, limiting the stability and sensitivity of X-ray detectors. Herein, a lowing temperature crystallization (LTC) method for liquid-phase epitaxial growth of 2D (PEA) 2 PbBr 4 single-crystal (SC) film on 3D CsPbBr 3 substrate is demonstratedand a 2D/3D (PEA) 2 PbBr 4 /CsPbBr 3 SC heterojunction is successfully constructed. The epitaxial (PEA) 2 PbBr 4 layer shows a pronounced passivation effect on CsPbBr 3 SC with a low trap density of 2.27 × 10 10 cm −3 . As such, the prepared 2D/3D heterojunction X-ray detector achieves a record-low detectable dose rate of 3.05 nGy air s −1 and high sensitivity of 34496 µC Gy air −1 cm −2 in 120 keV hard X-ray detection, with a largely suppressed dark current drift of 2.49 × 10 −4 nA cm −1 s −1 V −1 . In addition, the heterojunction detector exhibits a self-driven sensitivity of 44 µC Gy air −1 cm −2 due to its built-in electric field. This work provides a simple strategy to controllable construct 2D/3D MHP SC heterojunction with excellent optoelectronic characteristic, which is conducive to promoting the development of MHP SC X-ray detectors and other optoelectronic devices.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
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IF 7.7
XianWei Wang,Yue Zhai,Yuanhui Chen,Wei Zhang,Pei Liang,Qiangqiang Zhu,Hong Zhang,Juan Kang,Le Wang
s The development of a highly sensitive and reliable surface-enhanced Raman scattering (SERS) substrate is crucial for overcoming the limitations in its practical applications. Herein, a novel 3D waffle-like SERS substrate with high activity is constructed for detecting trace amounts of myricetin in complex analytes extracted from green tea. The substrate is achieved through a layered ternary film structure, where ordered poly (methyl methacrylate) opal photonic crystals (PMMA OPCs) serving as a 3D hot spots template and enhancing the performance of CsPbBr 3 film that facilitates efficient charge transport, and an Au film covered over the CsPbBr 3 film modulating the vibronic coupling and providing plasmonic hot spots. The PMMA-CsPbBr 3 -Au substrate exhibits a low detection limit of 10 −10 M with an 8.9 × 10 7 enhancement factor, signal repeatability and stability for R6G molecules. Furthermore, the SERS detection of myricetin content in Longjing green tea from different years is carried out, and the results show a good linear positive correlation with storage years (R 2 =98.2 %), demonstrating the potential application of 3D substrate for sensitive and reproducible SERS.
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Advanced Optical Materials
·
2024
·
IF 8
Pengpeng Cheng,Zehan Liu,Jian Zhou,Ruyan Kang,Xiaoshan Wang,Xiaoxuan Li,Xian Zhao,Jia Zhao,Zhiyuan Zuo
The hardware-level construction of artificial synapses, mimicking the functionality of biological synapses, is widely acknowledged as a pivotal stride in artificial intelligence systems. Particularly, establishing all-optical artificial synapses for neuromorphic computing, leveraging on-chip optical interconnects instead of conventional wired connections, has garnered widespread attention. Here, high-quality CsPbBr 3 single crystals are synthesized, and intriguing relaxation processes associated with reversible photo-induced phase transition (PIPT) are observed, leading to a corresponding change in the birefringence effect. The birefringence change is systematically analyzed by an optical system. The relaxation time of reversible PIPT is similar to the behavior patterns of biological synapses, enabling the device to mimic synaptic features. The device successfully mimics excitatory/inhibitory synaptic behaviors such as EPSP/IPSP, PPF, SDDP, SFDP, and SIDP by using 1310 nm signal. Furthermore, the device continues to exhibit excitatory/inhibitory synaptic functionality when 940 and 1550 nm signals are applied, achieving multi-wavelength synaptic behaviors. The all-optical devices have the advantages of low crosstalk, fast signaling, and wide optical bandwidth, which lays the foundation of all-optical hardware for neuromorphic computing systems.
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JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Yougui Yang,Yan Chen,Junhao Li,Ling He,Meng Wu,Qi Wang,Yong Yang,Zhangwen Long,Yuan Gao,Dacheng Zhou,Jianbei Qiu
All-inorganic perovskite quantum dots (QDs) in glass materials , specifically CsPbX 3 (X = Cl, Br, I), are being considered as the next-generation fluorescent materials due to their impressive luminous performance and stability. However, the crystallization process of quantum dots within the glass presents uncontrollable challenge, leading to uneven crystallinity and subsequent reductions in light efficiency, thereby affecting practical applications. In glass ceramics doped with rare-earth oxides , the introduction of rare-earth ions as nucleating agents can promote the self-precipitation of nanocrystalline crystals within the glass. Building upon this principle, we have doped rare-earth ions into borosilicate glass for the first time to induce the self-crystallization of CsPbBr 3 QDs. This approach effectively enhances the equilibrium distribution of quantum dots within the glass, resulting in a significant improvement in luminosity. Furthermore, the luminescence spectrum range of quantum dot-shaped luminescent glass materials can be finely tuned through rare-earth ion doping. This finding holds both theoretical and practical significance for their application in the field of lighting.
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TALANTA
·
2024
·
IF 5.6
Jiajun Zhong,Minghao Ge,Tongxu Gu,Tong Wang,Zhizhou Liu,Pengli Bai
Single-nanoparticle counting (SNPC) based on fluorescent tag (FT) stands out for its capacity to achieve amplification-free and sensitive detection of biomarkers. The stability and luminescence of FT are important to the sensitivity and reliability of SPNC. In this work, we developed novel perovskite/silica nanocomposites by in-situ nanoconfined growth of CsPbBr 3 nanocrystals inside mesoporous structure of silica nanoparticles. PbBr(OH) was formed in an alkaline-assisted reaction triggered by water on the surface of CsPbBr 3 nanocrystals. The as-obtained nanocomposites, featuring dual protection from silica matrix and PbBr(OH), exhibited high absolute photoluminescence quantum yield (PLQY) of 86.5% and demonstrated outstanding PL stability confronting with water, heat, ultrasound and UV-irradiation, which is desired by SNPC-based biosensor. Thereafter, these nanocomposites were used to construct an operationally friendly SNPC assay for the amplification-free quantification of cancer-associated miRNA. Quantitative detection of miRNA could be accomplished by directly counting the number of nanocomposites using a flow cytometer in this assay. This strategy did not ask for multiple washing steps and demonstrated specific and sensitive detection of miRNA 21, which exhibited a dynamic range of 1–1000 pM and limit of detection of 79 amol. The employment of highly stable perovskite/silica nanocomposites improved the test reliability and stability of SNPC, revealing the vast potential of perovskites in biosensing.
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