ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuanchao Lu,Ruixin Xiong,Xingyu Lin,Liangxiao Zhang,Xianghe Meng,Zisheng Luo
Rapidly and sensitively evaluating the acid value (AV) of edible oils is significant to ensuring food quality and safety. Cesium lead bromide perovskite nanocrystals (CsPbBr3 NCs) are an effective candidate for AV detection; however, their instability restricts wide applications. Herein, CsPbBr3@ZIF-8 was prepared by confining and growing CsPbBr3 NCs in situ into zeolitic imidazolate framework-8 (ZIF-8) to improve the stability, and a fluorescence sensor was established to evaluate the AV of edible oils. The results present that CsPbBr3 NCs (below 5 nm) with excellent optical properties were confined and grown in situ in micropores and mesopores of ZIF-8. Meanwhile, CsPbBr3@ZIF-8 had better long-term storage, ultraviolet-irradiation, and water-exposure stabilities, compared with CsPbBr3 NCs. Given the fact that free fatty acids (the major contributor of AV) decrease the fluorescence of CsPbBr3 NCs, the fluorescence intensities of CsPbBr3@ZIF-8 were negative-linearly related to oil AV (R2 = 0.9902) in 0.04–6.00 mg of KOH/g with a 0.06 mg of KOH/g limit of detection. Besides, the practical AV recovery was 92–101% with an average relative standard deviation of 2%. Furthermore, the detection time was 20 min. The response mechanism revealed that free fatty acids could remove surface ligands and increase surface defects to prompt the aggregation of CsPbBr3 NCs and the formation of lattice fringe dislocations, inducing a decrease in the fluorescence. Thus, a stable, sensitive, reliable sensor was established to evaluate the AV of edible oils.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhenyu Li,Huifeng Deng,Yu Jiang,Jianbin Ju,Xiaowen Huang,Lang Zhang,Guihua Ruan,Zhengyi Chen,Yipeng Huang
Portable fluorescence-based Cs + radionuclide sensing has received great concerns yet challenged by interference in complex sample matrices. Herein, a reliable method was established by in situ converting the preconcentrated Cs + to CsPbBr 3 perovskite nanocrystals in mesoporous silica modified with dibenzo 24-crown-8 ethers (DB24C8E-SiO 2 ), which combined the selective extraction of Cs + with in situ fluorescence derivatization to achieve good anti-interference ability. The high adsorption capacity (49.5 mg g −1 ) of DB24C8E-SiO 2 for Cs + and elution-free operation enabled enrichment factor up to 4500, which was conducive to reducing the limit of detection (LOD) for Cs + . By this method, the fluorescence intensity linearly increased with the Cs + concentration from 0.050 μg mL −1 to 100 μg mL −1 with an LOD of 0.017 μg mL −1 (S/N = 3). The concentration of Cs + in seawater sample was detected to be 0.056 μg mL −1 . The recoveries of Cs + in spiked samples remained above 88.90 % and the relative standard deviations were less than 12.06 %. In addition, the relative errors of this method were within ±13.2 % compared with the result from atomic absorption spectrometry. The study demonstrated the high potential of the method for removal and portable detection of Cs + .
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 8
·2995-3002
·
IF 6.4
Wenwei Lai,Chuanli Wu,Xiuxun Han
CsPbBr3 nanocrystals (NCs) exhibit great potential for various optoelectronic applications due to their excellent optoelectrical properties. However, the poor stability inherited from the ionic crystal structure limits their practical applications. Hence, coupling CsPbBr3 NCs with protective and functional materials for achieving superior properties is one of the current research challenges. Herein, three-dimensional hyperbranched structures of Eu-MOF were developed as effective frameworks coupled with CsPbBr3 NCs. Rich Eu-MOF morphologies including sheaf-like, dumbbell-like, and urchin-like ones were achieved in a controllable way via introducing an Al(Ac)3 additive. The crystal splitting growth mechanism was found to dominate the formation of hierarchical Eu-MOF structures, as evidenced by the time-dependent morphological evolution of an urchin-like Eu-MOF. In addition, acidic carboxylate salts (such as Al(Ac)3, Zn(Ac)2, Pb(Ac)2, Cu(Ac)2, Ni(Ac)2) effectively modulate the splitting of Eu-MOF crystal growth, which is deemed to be the synergistic effect of metal ions and acetate ions. Subsequently, a series of CsPbBr3/Eu-MOF composites were synthesized by pre-preparing various Eu-MOF hyperbranched structures, and they demonstrate excellent dual-emissive optical properties. A ratiometric fluorescence probe fabricated by encapsulating CsPbBr3 in the three-dimensional hyperbranched Eu-MOF structure exhibits remarkable sensitivity, good linearity, and high selectivity for DMF detection.
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Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 8
·4145-4152
·
IF 5.1
Qingwei Zhou,Hansheng Li,Fan Wu,Dan Chen,Fang Luo,Chucai Guo,Zhihong Zhu
Controlling the interface energy level and simultaneously passivating the surface defects of perovskite films are crucial for improving the efficiency and stability of perovskite solar cells (PSCs). In this study, two-dimensional MXene nanoflakes grafted with MoS2 quantum dots (QD) are utilized as multifunctional interlayers at the interface of perovskite/carbon in all-inorganic CsPbBr3 PSCs, aiming to enhance their performance and stability. MoS2 QDs are grafted onto the surface of MXene to use the unsaturated S atoms at the edge of MoS2 to passivate the under-coordinated Pb2+ in perovskite films and reduce the interface charge recombination. The MoS2-grafted MXene interlayer can also tune the energy level of perovskite films and provide an efficient pathway for hole transfer, thereby reducing open-circuit voltage (Voc) deficit and improving device performance. Moreover, the ion diffusion from the perovsikte layer to the carbon electrode is significantly suppressed due to the passivation of perovskite interface defects and the formation of isolation layers by the MoS2-grafted MXene interlayers. As a result, the optimized device exhibits a champion efficiency of 10.70% with an ultrahigh Voc of 1.701 V and significantly improved stability under persistent light irradiation and humidity (80%) for a remarkable 50 day period.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Juqing Li,Yanhong Fan,Tongtong Xuan,Haoran Zhang,Wei Li,Chaofan Hu,Jianle Zhuang,Ru-Shi Liu,Bingfu Lei,Yingliang Liu,Xuejie Zhang
All-inorganic CsPbBr3 perovskite quantum dots (QDs) are considered to be one of the most promising green candidates for the new-generation backlight displays. The pending barriers to their applications, however, lie in their mismatching of the target window of green light, scalable production, susceptibility to the leaching of lead ions, and instability in harsh environments (such as moisture, light, and heat). Herein, high-quality CsPbBr3 QDs with globoid shapes and cuboid shapes were in situ crystallized/grown inside a well-designed glass to produce nanocomposites with peak emission at 526 nm, which not only exhibited photoluminescence quantum yields of 53 and 86% upon 455 and 365 nm excitation, respectively, but also have been imparted of high stability when they were submerged in water and exposed to heat and light. These characteristics, along with their lead self-sequestration capability and easy-to-scale preparation, can enable breakthrough applications for CsPbBr3 QDs in the field of wide color gamut backlit display. A high-performance backlight white LEDs was fabricated using the CsPbBr3 QDs@glass powder and K2SiF6:Mn4+ red phosphor, which shows a color gamut of ∼126% of the NTSC or 94% of the Rec. 2020 standards.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Xianju Zhou,Qianyang Chang,Guotao Xiang,Sha Jiang,Li Li,Xiao Tang,Faling Ling,Yongjie Wang,Jingfang Li,Zhen Wang,Xuecong Zhang
Light-emitting perovskite quantum dots (PeQDs) are extensively investigated owing to their evident merits. However, it is still a challenge to adjust their intrinsic emissions and enhance their thermal stability to achieve full-color highly emissive QD-based light-emitting diodes (QLEDs), especially blue QLEDs. Herein, we demonstrate an effective strategy to fundamentally stabilize the crystal structure of CsPbBr 3 QDs by codoping Na + and Cu 2+ ions, which are designed to substitute Cs + (A sites) and Pb 2+ (B sites), respectively. It is found out that the codoping metal ions have significantly improved the thermal stability and the optical properties of the QDs. 40% of the emission intensity can be remained after 8 thermal cycles (20–120 °C) for CsPbBr 3 : Na + /Cu 2+ QDs, whilst less than 10% is maintained for undoped CsPbBr 3 QDs. Accordingly, stable blue QLEDs are packed by CsPbBr 3 : Na + /Cu 2+ QDs. Strong electroluminescence with the maximum luminance of 7161 cd m −2 and low turn-on voltage of 2.4 V are realized. The CIE coordinates are tuned from green (0.10, 0.74) to blue (0.17, 0.25) via Na + and Cu 2+ codoping. The maximum external quantum efficiency (EQE max ) is obtained as 4.52% for PeLEDs based on codoped QDs. The proposed metal ions A and B sites dual substitution strategy guarantees PeQDs as an extremely promising prospect in potential applications as high-resolution displays and high-quality lightings.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Bowen Zhang,Zhiyong Zhao,Fangfang Yu,Diandian Chen,Fei Cheng,Hari Bala,Zhanying Zhang
The CsPbBr 3 perovskite solar cells (PSCs) based on carbon counter electrode (CCE) are promising because of the advantages including fabrication simplicity and excellent stability, but their power conversion efficiencies (PCE) are low due to interfacial carrier recombination as the direct contact of the CsPbBr 3 with electron transport materials (ETM). In this paper, PbTiO 3 shells were grown onto TiO 2 nanorods to form PbTiO 3 -coated TiO 2 scaffold layer via a two-step method. The presence of PbTiO 3 could promote crystallinity of the CsPbBr 3 perovskite film and inhibits interface recombination at the CsPbBr 3 /TiO 2 interface. Consequently, the carbon-based CsPbBr 3 solar cells with PbTiO 3 /TiO 2 scaffold layer achieves a high PCE of 7.28%, demonstrating an increase by 19.9% compared with the devices based on TiO 2 NRs. Moreover, the champion devices exhibited excellent stability in ambient air, with the PCE value remaining at 93% over 28 days.
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Materials Today Energy
·
2021
·
IF 7.311
W.-W. Liu,Y.-C. Liu,C.-Y. Cui,S.-T. Niu,W.-J. Niu,M.-C. Liu,M.-J. Liu,B. Gu,L.-Y. Zhang,K. Zhao,F. Ran,Y.-L. Chueh
Fast extraction of photo-generated charge plays a crucial function in improving the photovoltaic conversion efficiency (PCE) of the perovskite solar cells (PSCs). Here, an effective strategy to decrease the charge recombination losses by introducing versatile carbon nitride ( g -C 3 N 4 ) nanosheets to the CsPbBr 3 films was demonstrated. The incorporation of the g -C 3 N 4 additive can restrain the nucleation and crystalline growth rate of perovskite films by an interaction of lone pair electrons from the exposed N atoms to the PbBr 2 precursor, resulting in high-quality CsPbBr 3 films with an increase in crystalline size. Notably, a ‘coupling effect’ between the lone pair electrons from g -C 3 N 4 nanosheets and unsaturated Pb dangling bonds (Br vacancies) around the grain boundaries significantly decreases trap states caused by defects, leading to the fewer recombination centers in CsPbBr 3 films. The g -C 3 N 4 nanosheets serving as an energy barrier can also successfully suppress the recombination loss of back electrons with holes from the g -C 3 N 4 interface, yielding a superior PCE of 8.0% with a fill factor of 80.25%. The result opens an alternative path to enhance the performance of CsPbBr 3 PSCs by passivating the trap states of perovskite films with the improvement of the crystallization quality and charge extraction efficiency.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Li Song,Lixin Huang,Yuan Liu,Yongsheng Hu,Xiaoyang Guo,Yulei Chang,Chong Geng,Shu Xu,Zihui Zhang,Yonghui Zhang,Nannan Luan
Perovskite light-emitting devices (PeLEDs) have drawn a great deal of attention because of their exceptional optical and electrical properties. However, as for the blue PeLEDs based on low-dimensional (LD) CsPbBr3, the low conductivity of the widely used organic spacers as well as the difficulty of forming pure and uniform LD CsPbBr3 phase have severely inhibited the device performance such as stability and efficiency. In this work, we report an effective strategy to obtain high-quality LD CsPbBr3 by using a novel spacer of inorganic Cs4PbBr6 instead of the common long-chain ammonium halides. We found that a 3-amino-1-propanol (3AP)-modified PEDOT:PSS was helpful to stimulate the formation of the LD blue emissive CsPbBr3:Cs4PbBr6 composite. We also revealed that an additive of poly(vinylpyrrolidone) (PVP) in the precursor can limit further growth of LD perovskite phase into 3D perovskite phase upon annealing, thus resulting in a uniformly distributed LD perovskite with high color stability. Consequently, efficient blue PeLEDs @ 485 nm with a brightness of 2192 cd/m2, current efficiency of 2.68 cd/A, and external quantum efficiency of 2.3% was successfully achieved. More importantly, the device showed much improved working stability compared to those with the spacer of organic ammonium halides. Our results provide some helpful insights into developing efficient and stable blue PeLEDs.
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Materials Horizons
·
2025
·
IF 10.7
Hongfei Liang,Lu Chen,Yang Wu,Youwen Xue,Yuxuan Wang,Wenjie Ji,Huanqi Cao,Qian Zhao,Jian Song,Guoran Li
Luminescence down-shifting technology is increasingly recognized as a crucial option for enhancing the efficiency of silicon solar cells. However, high-quality down-shifting materials, such as perovskite quantum dots, face challenges related to poor thermal stability. These materials tend to agglomerate into larger sizes, leading to the deterioration of the luminescence films at high temperature. Unlike introducing a protecting layer on perovskite quantum dots, we applied 3-aminopropyltriethoxysilane (APTES) as a direct capping agent for perovskite quantum dots in this work to achieve both efficient and stable composite down-shifting films. The interaction between APTES and CsPbBr3 quantum dots is thoroughly analyzed using both experimental measurements and theoretical calculations. Due to the strong interaction between APTES and CsPbBr3, an optimal amount of APTES effectively stabilizes the quantum dots. When mixed with ethylene-vinyl acetate (EVA) copolymer, the strong interaction between APTES and polymer chains could suppress the aggregation of CsPbBr3 quantum dots and inhibit degradation of the composite film under heating. Upon coating on commercial crystalline silicon solar cells, the optimal CsPbBr3 quantum dot/EVA composite film achieves an absolute efficiency by 1.00%, maintaining a 0.81% efficiency improvement even after annealing at 90 °C for 3 hours. In contrast, while the film without APTES shows an efficiency improvement of 0.63% at room temperature but experiences a decrease of 0.23% under the same heating conditions. This work provides a feasible strategy to enhance the thermal stability of CsPbBr3 quantum dot/EVA composite films under high-temperature conditions, offering a promising path toward the commercial application of perovskite-based luminescence down-shifting films in silicon solar cells.
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Nanoscale
·
2022
·Vol. 14
·期 37
·13779-13789
·
IF 8.307
Yanqiao Xu,Xiaobo Hu,Haijie Chen,Huidong Tang,Qing Hu,Ting Chen,Weihui Jiang,Lianjun Wang,Wan Jiang
A great hurdle restricting the optoelectronic applications of cesium lead halide perovskite (CsPbX3) nanocrystals (NCs) is due to the uncoordinated lead atoms (Pb0) on the surface, where most attempts to address the challenges in the literature depend on complicated post-treatment processes. Here we report a simple in situ surface engineering strategy to obtain highly fluorescent and stable perovskite NCs, wherein the introduction of the multifunctional additive 1-butyl-3-methyl-imidazolium tetrafluoroborate ([Bmim]BF4) can significantly eliminate the Pb0 traps. The photoluminescence quantum yield (PLQY) of the as-synthesized NCs was improved from 63.82% to 94.63% due to the good passivation of the surface defects. We also confirm the universality of this in situ passivation pathway to remove Pb0 deep traps by using fluoride acid-based ionic liquids (ILs). Due to the high hydrophobicity of the cations of ILs, the as-prepared CsPbBr3 NCs exhibit robust water resistance stability, maintaining 67.5% of the initial photoluminescence (PL) intensity after immersion in water for 21 days. A white light emitting diode (LED), assembled by mixing the as-synthesized CsPbBr3 NCs and red K2SiF6:Mn4+ phosphors onto a blue chip, exhibits high luminous efficiency (100.07 lm W−1) and wide color gamut (140.64% of the National Television System Committee (NTSC) standard). This work provides a promising and facile technique to eliminate the Pb0 traps and improve the optical performance and stability of halide perovskite NCs, facilitating their applications in optoelectronic fields.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Qiuxue Leng,Shuang Han,Minghui Zhai,Shiwei Liu,Yuzhuo Song
Here, a novel molecularly imprinted photopolymer was prepared using CsPbBr 3 quantum dots as the fluorescence source, TpPa-2 as substrate for selective solid fluorescence detection of patulin (PAT). TpPa-2 can promote efficient recognition of PAT due to its unique structure and significantly improve the fluorescence stability and sensitivity. The test results showed that the photopolymer exhibited large adsorption capacity (131.75 mg/g), fast adsorption ability (12 mins), superior reusability and high selectivity. The sensor proposed had good linearity for PAT in the range of 0.2–20 ng/mL and was applied to the analysis of PAT in apple juice and apple jam with a limit of detection as low as 0.027 ng/mL. Therefore it maybe a promising method for solid fluorescence detection of trace PAT in food analysis.
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