OPTICAL MATERIALS
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2024
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IF 3.8
Zongyi Meng,Zunxian Yang,Yuliang Ye,Zhiwei Zeng,Hongyi Hong,Songwei Ye,Zhiming Cheng,Qianting Lan,Jiaxiang Wang,Ye Chen,Hui Zhang,Yuting Bai,Xudong Jiang,Benfang Liu,Jiajie Hong,Tailiang Guo,Fushan Li,Yongyi Chen,Zhenzhen Weng
Quantum-dot light-emitting diodes (QLED) have become a research trend in the field of new displays due to their low cost, wide color gamut , narrow bandwidth, and characteristics that enable production through the solution-gel method. However, the electrical performance of QLED is consistently constrained by energy losses and imbalanced charge carrier injection. This motivates our focus on exciton recombination and energy losses within the quantum-dot layer to enhance the electrical efficiency of QLED. In this work, we introduce a method using a CdZnS quantum dot (B-QD) interlayer to modulate energy transfer and charge carrier transport in QLED devices employing CdSe quantum dot (G-QD) as the emissive layer . By strategically incorporating a B-QD layer between the G-QD and HTL/ETL, we facilitate energy transfer due to the overlap between the excitation wavelength of B-QD and the absorption wavelength of G-QDs. This leads to enhanced energy injection in QLED devices, resulting in a high current efficiency of 39.54 Cd/A and a peak brightness of 522,272 cd/m 2 for efficient QLED. The corresponding external quantum efficiency (EQE) is greatly improved from 5.62 % to 9.4 %. Our work provides a straightforward and effective approach to modulate exciton recombination and energy injection and further can be applicable to other photo-electronics devices.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 37
·16230-16242
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IF 2.7
Liang Wei,Sihong Li,Haibo Wang,Zimei Mo,Junji Chen,Meng Li,Hongxi Zhang,Jing Yang,Xiande Yang
Aflatoxin B1 (AFB1), a mycotoxin commonly found in foodstuffs, poses significant health risks when ingested through contaminated food sources. Therefore, it is imperative to devise a safe and efficient method for AFB1 degradation. Graphitic carbon nitride (g-C3N4) stands out as an exceptionally stable, non-toxic, and economical photocatalyst, which is widely used in photocatalysis. In this study, we explored the photocatalytic performance of four g-C3N4 catalysts derived from different precursors (dicyandiamide (D-CN), melamine (M-CN), thiourea (T-CN), and urea (U-CN)) in AFB1 degradation under visible light. Notably, the U-CN catalyst displayed an impressive degradation rate of 93.5% for AFB1 within 30 min, outperforming M-CN (82.5%), T-CN (78.5%), and D-CN (46.2%). This superior performance is attributed to its inherent porous structure, enlarged specific surface area, and reduced electron–hole pairs’ recombination rate. Additionally, our investigation identified ˙O2− as the primary active species in AFB1 degradation. Furthermore, we explored the degradation pathway of AFB1 and its associated inactivation mechanism mediated by the U-CN catalyst. This work provides a theoretical foundation for developing highly efficient photocatalysts in AFB1 degradation.
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FOOD CHEMISTRY
·
2025
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IF 9.8
Weipeng Tong,Yingjie Du,Mingjian Yao,Hao Fang,Weitao He,Yi Zhang,Yu Su,Yuankui Leng,Xiaolin Huang,Ying Xiong,Yonghua Xiong
An innovative light scattering immunoassay was developed using an AuNPs etching strategy. Three types of anisotropic gold nanoparticles, including gold nanocubes, nanorods, and nanoflowers with distinct morphologies, were utilized to investigate how these morphological differences affect the sensitivity of light scattering signal transduction. Based on theoretical insights into light scattering and electromagnetic fields, gold nanocubes were identified as the optimal probes for enhancing light scattering signal transduction and were employed to construct an immunoassay for detecting staphylococcal enterotoxin A (SEA). The developed immunoassay achieved ultrahigh sensitivity for SEA detection in milk samples, with a detection limit of 10.39 pg mL −1 , which is 190 times lower than that of conventional ELISA. The proposed immunoassay was validated across ten food samples, demonstrating high accuracy and robustness. Given these promising results, we believe this method has significant potential for screening trace levels of SEA in food products.
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LANGMUIR
·
2024
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IF 3.7
Xiuxian Gu,Jinyue Ma,Junhui He
Although a wide variety of single-function coatings have been successfully developed, the integration of multiple functions onto a single coating has remained an immense challenge in the field. Here, we report a simple room-temperature fabrication of robust coatings with UV-shielding, light conversion, and antifogging functionalities. The addition of glutaraldehyde (GA) molecular cross-linker and carbon dot (CD) nanocross-linker with light conversion function to poly(vinyl alcohol) (PVA) resulted in the formation of robust spatial structures of coatings. The fluorescence intensity tests demonstrated that the coatings had an excellent ability to absorb and convert ultraviolet light into blue-violet light. Both cold-warm and hot-vapor tests showed that the coatings had excellent antifogging performance. To our surprise, no creases were observed after coatings were immersed in water for 1 month, indicating that these are much stronger than those reported so far. The 8H pencil hardness and wear resistance attested to their excellent mechanical properties. The current preparation method can be operated at ambient temperature and is not restricted by the substrate type and shape. Therefore, it may also expand the possibilities for future applications of coatings for glass windows, optical microscopes, eyeglasses, agricultural greenhouses, and so on.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Shuoqi Zhang,Mingxing Zhao,Lei Shi,Chunsheng Lei
In this paper, a novel Z-scheme BiOI/ZIF-67 photocatalyst (BOI/ZIF) was successfully prepared using an in-situ growth method, and its effectiveness in degrading tetracycline (TC) under visible light was assessed. Using a range of characterization techniques, the crystal structure, elemental composition, microstructure and optical characteristics of the composite catalyst were examined. Simultaneously, a 30 % mass ratio catalyst (BOI/ZIF-30) could remove 91 % of TC under visible light, which was 41 % and 28 % greater than the degradation rates of BiOI and ZIF-67, respectively. These results demonstrated that BOI/ZIF exhibited strong photocatalytic activity and excellent stability. The results of the radical quenching experiment and electron spin resonance revealed that h + and •O 2 − were the principal chemical substances responsible for TC degradation, corresponding with the suggested charge transfer mechanism of Z-scheme heterojunction. The Z-scheme heterojunction created between BiOI and ZIF-67 improved the effective separation of photogenerated carriers and boosted the efficiency of TC degradation. This study offers a promising method for designing photocatalytic systems to break down antimicrobial contaminants.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Sheng Li,Wentong Fan,Qiulin Chen,Xinfeng Zhang
Sulfur quantum dots (SQDs) are emerging fluorescent nanomaterials, whereas most of the methods for synthesizing SQDs are limited to thermal synthesis. In this study, we report the first case of a light-driven strategy for facile synthesis of SQDs and further applied the SQDs for fluorescence cell imaging. The light-driven synthesis strategy only utilized Na2S as the sulfur source and nano-TiO2 as the photosensitizer. Under ultraviolet illumination, the nano-TiO2 photosensitizer generated a large number of •O2– and •OH to oxidize S2– to Sx2– and further to elemental sulfur, which could be obtained as monodispersed SQDs after etching by H2O2. The prepared SQDs exhibit excellent tunable photoluminescence properties, superior stability, and a uniform small size, with particle diameters in the range of 0.5–4 nm, and the fluorescence absolute quantum yield is as high as 27.8%. Meanwhile, the prepared SQDs also exhibited extreme biocompatibility and stability, and we further applied it for intracellular imaging and Hg2+ sensing with satisfactory results. In comparison to the widely reported thermal synthesis, the light-driven synthesis method is greener and simpler, opening a new way for the preparation of biocompatible SQDs.
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REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Shan Wu,Yuhan Duan,Wenru Kuang,Wenyue Dong,Xu Cui,Xiaodong Zhang,Qian Duan
Metal phthalocyanines (MPcs) have attracted more and more attention in recent years for the catalytic degradation of pollutants in water driven by visible light. However, they are easy to aggregate in the aqueous phase and difficult to recycle, which seriously limits their photocatalytic activity and applicability. Introducing phthalocyanine into polymers may be an effective way to solve the above problems. Herein, three kinds of copolymers PNIPAM x - co -PDUPcZn y with different molecular weights and monomer ratios were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization, with S-1-dodecyl-S′-(α,α’-dimethyl-α”-acetic acid)trithiocarbonate (DDMAT) as chain transfer agent, 3-undecenamide-9(10),16(17),23(24)-decyloxy‑zinc phthalocyanine (DUPcZn) and N -isopropyl acrylamide (NIPAM) as monomers, 2,2′-azobis(2-methylpropionitrile) (AIBN) as initiator. The polymerization process shows the characteristics of living polymerization, and the polymer dispersity index (PDI) values are <1.1. The three copolymers exhibit obvious thermo-responsive characteristics and the lower critical solution temperatures (LCSTs) are between 32.7 °C and 33.1 °C. The photocatalytic activity of the copolymers was evaluated by using 1,5-dihydroxynaphthalene (DHN) and Cr(VI) as model pollutants. It was found that the three copolymers had photocatalytic oxidation performance for DHN and photocatalytic reduction performance for Cr(VI), and their photocatalytic property was affected by the pH of the model pollutant solution and the catalytic temperature. Among them, PNIPAM 57 - co -PDUPcZn 7 exhibit a photocatalytic oxidation rate of 93.0% for DHN and the photocatalytic reduction rate of 70.0% for Cr(VI), respectively, under the visible light irradiation for 120 min at pH = 5 and 32 °C. More importantly, the homogeneous catalysis and heterogeneous recovery are achieved in the catalytic process through simple temperature regulation. In addition, the copolymers exhibited excellent chemical stability and reusability after three cycles. Finally, O 2 1 /e − was determined to be the active species that plays a crucial role in the photocatalytic oxidation/reduction process, upon which a possible photocatalytic mechanism was proposed. This research provides a promising strategy for the synthesis of environmentally friendly visible light catalysts for the sewage (waste) water treatment.
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BIOELECTROCHEMISTRY
·
2024
·
IF 4.8
Guiyin Li,Wenzhan Li,Yu Zhou,Xiaohong Tan,Qing Huang,Jintao Liang,Zhide Zhou
Glypican-3 (GPC3) is exclusively overexpressed in most Hepatocellular carcinoma (HCC) tissue but not in normal liver tissue, making it a promising biomarker for the precise detection of HCC. In this paper, a label-free light-addressable potentiometric sensor (LAPS) decorated by platinumpalladium-hemin-reduced graphene oxide nanocomposites (PtPd@H-rGO NCs) was constructed for determination of GPC3. The GPC3 aptamer (GPC3 Apt ) and PtPd@H-rGO NCs were modified on the surface of silicon-based LAPS chip to build sensitive unit of LAPS system. A readout photocurrent elicited from a modulated light source, registers the localized surface potential change. When a bias voltage is provided to the LAPS system, the GPC3-GPC3 Apt complexes formed by the specific reaction between GPC3 and GPC3 Apt at the sensing interface can cause the sensitive membrane surface potential to change, resulting in the photocurrent-voltage (I-V) curves generate a corresponding offset response. Therefore GPC3 concentration can be determined by monitoring the potential shifts (△V). Under optimal conditions, the potential shift is linearly related to the concentration of GPC3 in the range of 0.001–3.00 μg/mL with the limit of detection (LOD) of 0.0001 μg/mL. The LAPS has a good analytical performance with good specificity, reproducibility and stability, and can be used for the detection of GPC3 in actual serum samples, which provides a broad application prospect for the combined application of LAPS and aptamers in biooassay.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiangming Li,Bo Sun,Qingpeng Chen,Hiang Kwee Lee,Bo Shi,Hegang Ren,Haitao Li,Zequn Ma,Meng Fu
The reduction of 4-nitrophenol (4-NP) into 4-aminophenol (4-AP) is an important reaction in both chemical manufacturing and environmental protection. The design of a highly active, multifunctional and reusable catalyst for efficient 4-NP decontamination/valorization is therefore crucial to bring in economic and societal benefits. Herein, we achieve an efficient plasmonic-photothermal catalyst of Pd nanoparticles by growing them on graphene-polyelectrolytes self-assembly nanolayers via an in situ green reduction approach using polyelectrolyte as the reductant. The as-fabricated catalyst shows high catalytic behaviors and good stability (maintained over 92.5 % conversion efficiency after ten successive cycles) for 4-NP reduction under ultra-low catalyst dose. The rate constant and turnover frequency were calculated at 0.197 min −1 and 7.79 mmol g −1 min −1 , respectively, which were much higher than those of most reported catalysts. Moreover, the as-prepared catalyst exhibited excellent photothermal conversion efficiency of ∼77 % and boosted 4-NP reduction by ∼2-fold under near-infrared irradiation (NIR). This study provides valuable insights into the design of greener catalytic materials and facilitates the development of multifunctional plasmonic-photothermal catalysts for diverse environmental, chemical, and energy applications using NIR.
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Laser & Photonics Reviews
·
2024
·
IF 9.8
Xiaoxi Li,Mengling Xia,Weiwei Li,Ping Lu,Xianghua Zhang,Yinsheng Xu
Lead-free halide perovskites (LHP) have attracted extensive attention in the field of next-generation solid-state lighting. However, single perovskite phosphor with tunable white-light emission and ultra-high photoluminescence quantum yield (PLQY) are rare. Here, the tunable dual-color emission LHP phosphor is developed with a near-unity PLQY of 99.5%. The LHP phosphor comprises Cs 2 NaInCl 6 : Sb 3+ /Bi 3+ and Cs 2 InCl 5 ·H 2 O: Sb 3+ /Bi 3+ crystals, with the transition between these two perovskite structures being adjustable by the concentration of Na + . The addition of NaCl inhibits the hydrolysis of the [Sb(H 2 O)Cl 5 ] 2− octahedron, resulting in 3D connected [SbCl 6 ] 3− octahedron with less Jahn-Teller distortion, and the PLQY of LHP is greater than 90%. Finally, the white-light diode device is fabricated by assembling the LHP with a ultraviolet light-emitting diode chip and the white light-emitting diode device achieved Commission Internationale de l'Eclairage color coordinates of (0.34, 0.33), correlated color temperature of 4936 K, and a high color rendering index of 92.9. The LHP perovskite exhibited multimodal luminescence when excited by 365, 335, and 310 nm UV light, showing the multi-mode anti-counterfeiting capabilities of the LHP crystals.
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JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Hui Zhang,Zhenyang Wang,Zhixing Chen,Xingyue Zhang,Yuanming Zhou,Fei Mei
The two-dimensional transition metal carbide MXenes, often designated by Ti 3 C 2 T x , have garnered significant interest on account of their distinctive optoelectronic characteristics. In this paper, PEDOT:PSS/Ti 3 C 2 T x composite hole transport layer (HTLs) was prepared by adding the MXenes material Ti 3 C 2 T x into PEDOT:PSS, and quasi-two-dimensional perovskite light-emitting diodes (PeLEDs) were fabricated and investigated. While the addition concentration of Ti 3 C 2 T x was 0.25 mg/mL, the optimal device shows the maximum luminance of 6250 cd/m 2 , and the current efficiency of 6.17 cd/A, which is 133 % and 112 % higher than the reference device without Ti 3 C 2 T x , respectively. It is indicated that the additive incorporation of Ti 3 C 2 T x in PEDOT:PSS can improve the efficiency of hole injection and conductivity of hole transport layer, and passivate the defects of perovskite film, thus enhancing the optoelectronic performance of PeLEDs. The findings of this study indicate that the PEDOT:PSS/Ti 3 C 2 T x composite HTLs has considerable potential for application in PeLEDs.
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ACS Catalysis
·
2025
·
IF 13.1
Dong Cao,Jingcheng Du,Jingguo Li,Qian Sun,Jian Guan,Jiangtao Liu
Photocatalytic hydrogen peroxide (H2O2) production via the oxygen reduction reaction (ORR) provides a promising and energy-saving alternative to the traditional energy-intensive anthraquinone process. Nevertheless, how to decrease the energy barrier of the two-electron (2e–) ORR process and photosynthesize H2O2 efficiently is still challenging. Herein, three hydroxyl-functionalized donor–acceptor covalent organic frameworks (COFs) are synthesized for photocatalytic H2O2 production under visible-light irradiation (420 ≤ λ ≤ 780 nm). It is observed that the dihydroxyl functionalization (2,5-DhaTph and 2,3-DhaTph) facilitates the transportation of photogenerated carriers between acceptor and donor units and accelerates the kinetics of the rate-limiting step of the ORR when comparing with the monohydroxyl functionalization (2-DhaTph). Further, 2,5-DhaTph with para-position hydroxyl functionalization shows higher H2O2 photosynthesis efficiency than 2,3-DhaTph (ortho-positioned hydroxyl), probably due to the greater exposure of catalytically active sites. This is supported by a better structural symmetry of 2,5-DhaTph, which contributes to higher crystallinity and higher specific surface areas. Electron paramagnetic resonance (EPR) spectra and theoretical calculations show that 2,5-DhaTph produces the *OOH intermediates with a reduced energy barrier, resulting in a high H2O2 production rate of 2103.1 μmol h–1 g–1. Regulating the amount of hydroxyl substituents and their location on the donor units of COFs is an effective strategy to boost photogenerated carrier transfer and reduce the energy barrier of O2-to-H2O2 conversion.
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