SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Xiulian Yin,Yingjin Li,Mingjie Wei,Yanni Ji,Qinghua Cao,Xiangfen Xue
Spectral retrieval method plays a crucial role in spectral analysis technology. Nevertheless, research in this area has not received the requisite advancement for fluorescence excitation-emission matrix (EEM) spectroscopy, which has been widely used in environmental monitoring and other fields. In this work, we developed a spectral retrieval method, the contour line-based image pattern recognition (CLIPR) technique, to interpret the EEM spectrum. A three-level retrieval mechanism, including the primary feature Lib1, qualitation Lib2 and quantitation Lib3 has been set up. Optimization efforts have been conducted on the accuracy and efficiency of noise removing, feature extraction and image retrieval methods. To demonstrate the technique, four model pollutants with very similar chemical structures and a metal-organic framework (MOF), MOF-74 (Zn), as a fluorescence probe providing more dimensional information were used. A total of 28 × 4 EEM map images were modeled and validated using the leave-one-out cross-validation method. Two batches with 5 × 4 samples each as unknown samples were selected to evaluate the performance of the CLIPR method. When taking the weight value set with 0.8, 0.1 and 0.1, for the validation sets with the concentration greater than 50 μM, the intra class similarity is above 79.61 % and the accuracy reached 98.81 % (83/84). The best quantitative result is PhNH 2 -S1, with the RMSE/True value 3.09 % and R 2 0.99. For the unknown sets, when Batch 1 greater than 35 μM and Batch 2 greater than 50 μM, the recognition accuracy reaches 100 %. The research results indicate that the model has a certain degree of stability and generalization and it is feasible to apply spectral retrieval method to interpret EEM information. We have taken a step forward in laying the foundation for large-scale reference data preparation in this field.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Jian Sun,Liang Chen,Zhipeng Liu,Zhiwei Gu,Lixin Song,Pingfan Du
Nonradiative recombination losses induced by surface and grain boundary defects in perovskite films severely limit their power conversion efficiency (PCE) and stability. In this study, effective passivation of film defects was achieved by incorporating poly(methyl vinyl ether-alt-maleic anhydride) (PMVEMA) into the perovskite precursor solution. The carbonyl groups (C═O) in PMVEMA coordinate with Pb2+ ions, thereby enhancing crystallinity, suppressing carrier recombination, and reducing trap-state density. Additionally, the hydrophobic groups in PMVEMA contribute to enhanced environmental stability of the perovskite films, and its flexible polymer chains significantly improve the mechanical flexibility of the devices. Experimental results demonstrate that PMVEMA-modified rigid and flexible devices achieved PCEs of 22.12 and 20.05%, respectively, under ambient air conditions. Moreover, after 600 h of storage in the dark, the devices retained 85% of their initial efficiency, compared to only 44% for the control devices. This study highlights the potential of PMVEMA as a functional additive for enhancing the performance and stability of perovskite solar cells (PSCs), providing an effective strategy for the development of efficient and flexible photovoltaic devices.
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NATURE
·
2025
·
IF 48.5
Zou Chen,Ren Zhixiang,Hui Kangshuo,Wang Zixiang,Fan Yangning,Yang Yichen,Yuan Bo,Zhao Baodan,Di Dawei
Solution-processed semiconductor lasers promise lightweight, wearable and scalable optoelectronic applications. Among the gain media for solution-processed lasers, metal halide perovskites stand out as an exceptional class because of their ability to achieve wavelength-adjustable, low-threshold lasing under optical pumping 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 . Despite the progress in this field, electrically driven lasing from perovskite semiconductors remains a critical challenge. Here we demonstrate an electrically driven perovskite laser, constructed by vertically integrating a low-threshold single-crystal perovskite microcavity sub-unit with a high-power microcavity perovskite LED (PeLED) sub-unit. Under pulsed electrical excitation, the dual-cavity perovskite device shows a minimum lasing threshold of 92 A cm −2 (average threshold: 129 A cm −2 , at about 22 °C, in air), which is an order of magnitude lower than that of state-of-the-art electrically driven organic lasers 9 , 10 . Key to this demonstration is the integrated dual-cavity device architecture, which allows the microcavity PeLED sub-unit to deliver directional emission into the single-crystal perovskite microcavity sub-unit (at a coupling efficiency of about 82.7%) to establish the lasing action. An operational half-life ( T 50 ) of 1.8 h (6.4 × 10 4 voltage pulses at 10 Hz) is achieved, outperforming the stability of electrically pumped organic lasers 9 , 10 . The dual-cavity perovskite laser can be rapidly modulated at a bandwidth of 36.2 MHz, indicating its potential for data transmission and computational applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Wen Guo,Lixin Song,Jinhuan Jiang,Tianguang Guo,Chenyang Shi,Xin Yin,Jie Xiong
The enhancement in efficiency and stability of air-processed perovskite solar cells (PSCs) have garnered increasing attention. Carbon-based composite materials additives, due to their excellent electrical conductivity, outstanding stability and high flexibility, provide a novel idea for improving the performance of perovskite films as well as PSCs. In this study, the superfine SnO x /carbon composite nanofibers (SnO x /C NFs) with the average diameter of 26 nm was doped into perovskite films and modulating perovskite crystallization. The SnO x /C NFs provided a uniform heterogeneous nucleation site, regulate the crystal morphology of perovskite films via Sn-I coordination and O/(MA + , FA + ) electrostatic coupling, passivated the organic cations and Pb 2+ vacancy defects within the perovskite structure, and enhanced the overall quality of the films. The distinctive one-dimensional structure of SnO x /C NFs provides additional channels for charge transport, thereby facilitating more efficient charge extraction and effectively alleviating device defects. In addition, the flexible nanofibers released the residual stress and enhanced the stability of the devices. The power conversion efficiency (PCE) of the champion device with low hysteresis prepared under open-air conditions was 22.32 %. The champion device maintained initial PCE of 80.3 %, 90.6 % and 86.6 % under 55 ± 5 % RH for 1200 h, 85 °C for 500 h and AM 1.5 light illumination for 500 h, respectively. In addition, the SnO x /C NFs-based flexible-PSCs (f-PSCs) achieved a champion efficiency of 19.84 % and retained 92.13 % of their initial PCE after 300 cycles (radius = 7 mm).
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POLYMER
·
2025
·
IF 4.5
Jinqi Ye,Nasha Zeng,Lili Wang,Keying Zheng,Junyi Lu,Minghua Wu
Disperse dyes wash-free inkjet-dyeing is one of the important research and development directions to achieve clean dyeing of polyester fabrics. Wash-free binders are needed to be designed with a special molecular structure to achieve good colour yield and fixation during dyeing. Specifically, isophorone diisocyanate and polypropylene glycol were used as the monomers of the hard and soft chain segments of the polymer, respectively, and KH-560 as the capping agent, to prepare a series of end-group cross-linked organosilicon modified waterborne polyurethane (SWPU). It was applied as wash-free binder for the digital inkjet-dyed polyester fabrics. The results showed that, for 2 wt% KH-560 and 40 wt% hard chain segments, the SWPU film had good water resistance, mechanical properties, and adhesion properties, and the best dispersed dye directional effect. With the addition of SWPU in the dye ink of 8 wt%, the front K/S value of the SWPU wash-free digital inkjet-dyes fabric reached 16.86, and the dry/wet rubbing fastness achieved grades 4–5 and 3–4, respectively. Compared with the pure dye inkjet-dyed fabric, its front K/S value increased by 23.9 %, and its dry/wet rubbing fastness improved by grades 1 and 0.5, respectively.
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Journal of Physical Chemistry C
·
2025
·
IF 3.2
Lifang Zheng,Changsheng Feng,Yan Wang,Feiyue Ge,Lijun Hu,Yue Chen,Fang Cheng,Xue-Jun Wu
Silver nanocrystals (NCs) possess excellent localized surface plasmon resonance features, and recent studies have revealed the great impact of crystallinity on their optical properties. However, the synthesis of highly monodisperse single-crystalline Ag nanocrystals (SC-Ag NCs) still encounters challenges, which require the elimination of undesirable defective NCs. Herein, we present a templated transformation method for the preparation of SC-Ag NCs with the assistance of Cu ions. The evolution from Ag2S to Ag NCs is driven by heterogeneous nucleation of the Ag on the surface of Ag2S NCs with the strong coordination effect of the alkylphosphine. The method is highly applicable for SC-Ag NCs with tunable sizes as well as SC-AgAu-alloyed NCs with an adjustable composition. The as-obtained SC-Ag NCs exhibit superior optical properties and enable enhanced performance in molecular sensing and Raman enhancement, compared to multitwinned counterparts with a similar size. This methodology contributes to the development of SC plasmonic NCs and broadens their applications in sensing, photonics, and catalysis.
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Journal of Physical Chemistry C
·
2025
·
IF 3.2
Yi Chen,Junzi Li,Can Ren,Tingchao He
Hybrid metal halide (HMH) heterojunctions have been widely studied due to their unique quantum well structures and excellent optical properties. In this work, two kinds of 2D/3D HMH heterojunctions have been constructed, i.e., (S-2-NEA)2PbBr4/MAPbBr3 (S-MA) and (S-2-NEA)2PbBr4/FAPbBr3 (S-FA). By using femtosecond-transient absorption spectroscopy, it is revealed that S-MA has a more efficient energy transfer efficiency compared to S-FA. Based on the measurement of temperature-dependent photoluminescence spectra, it is confirmed that the S-MA exhibits stronger electron–phonon (EP) coupling strength than that of the S-FA film. As a result of more efficient energy transfer and stronger EP coupling strength, S-MA exhibits two- and three-photon absorption coefficients larger than those of S-FA. This work highlights the synergistic role of energy transfer and EP coupling in enhancing multiphoton absorption, providing crucial insights for designing HMHs with superior nonlinear optical properties.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Xiao Han,Xiujuan Zhong,Fanpeng Meng,Jinsheng Zhao,Jun Yang,Yongfa Zhu,Qian Xu,Jun Hu,Ningqiang Zhang
Building polymer heterojunctions (PHJs) is a promising way to enhance the performance of single-polymer photocatalysts, but it's still challenging to design the ideal structure with well-matched energy levels and strong interface synergy by precisely tuning the molecular structure of polymer. Herein, two triazine-based conjugated porous polymers (CPPs) were synthesized in advance including TB and TR via linkage unit modulation at the molecular level, and then their PHJs with carbon nitride (g-C 3 N 4 ) nanosheet including TB/CN and TR/CN were successfully constructed by the convenient physical ball milling method. Theoretical calculations, electron paramagnetic resonance (EPR), and in situ X-ray absorption near-edge structure (XANES) spectra show that replacing thiophene rings in TR with phenyl rings in TB changes the PHJ structure from type-I (TR/CN) to an S-scheme (TB/CN) heterojunction. Compared to TR/CN, TB/CN exhibits a stronger internal electric field (IEF), better redox ability, longer exciton lifetime, and improved charge separation and transport. As a result, TB (Wang et al., 2023a (20))/CN achieves a much higher hydrogen evolution rate (HER) of 9.11 mmol g −1 h −1 , which is 1.8 times of TR (Wang et al., 2023a (20))/CN and 6.6 times of pure g-C 3 N 4 . TB (Wang et al., 2023a (20))/CN also shows superior Cr(VI) reduction efficiency (98.5 % in 60 min), outperforming TR (Wang et al., 2023a (20))/CN (82.0 %) and g-C 3 N 4 (21.8 %). This study shows that adjusting the linkage units can effectively tune the interface properties of PHJs, offering a promising strategy for designing efficient polymer-based photocatalysts.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Hongxin Liu,Min Gong,Wen Li,Xiankan Zeng,Chen Meng,Jin Luo,Weiqing Yang,Sijie Zhang
The bromide-chloride mixed quasi-two-dimensional (quasi-2D) perovskites with high exciton binding energy have demonstrated remarkable potential for efficient blue perovskite light-emitting diodes (PeLEDs). However, challenges persist due to the poor energy transfer efficiency in quasi-2D perovskites and imbalanced charge injection at the interface, which results in notable exciton quenching. This study employs an effective approach termed “systematic synergistic engineering” by introducing 4-guanidinobenzoic acid methanesulfonate (GAMS) into the perovskites and 2-bromoethylphosphonic acid (BPA) molecules at the buried interface, respectively. Benefiting from the high absorption energy with charge defects of the guanidinobenzoic acid (GA) group as a spacer, contributing to a homogeneous phase distribution, the small-sized methanesulfonate (MS) group serves as a synergistic passivator to reduce trap states, which accelerates energy transfer efficiency. Moreover, the BPA buffer layer with strongly electronegative groups not only reduces buried interface defects but also deepens the valence band maximum (VBM) of poly(9-vinylcarbazole) (PVK), ultimately enhancing hole-injection efficiency. As a result, efficient and spectrally stable blue PeLEDs achieve a maximum external quantum efficiency (EQE) of 9.1% and a maximum luminance of 2460 cd m–2 at 480 nm. This work delineates an effective method for the efficient blue quasi-2D PeLEDs.
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Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-15
·
IF 36.3
Zheng Haiying,Liu Guozhen,Dong Xinhe,Chen Feifan,Wang Chao,Yu Hongbo,Zhang Zhihua,Pan Xu
Interface modification has been demonstrated as an effective means to enhance the performance of perovskite solar cells. However, the effect depends on the anchoring mode and strength of the interfacial molecules, which determines whether long-term robust interface for carrier viaduct can be achieved under operational light illumination. Herein, we select squaric acid (SA) as the interfacial molecule between the perovskite and SnO 2 layer and propose a self-regulated bilateral anchoring strategy. The unique four-membered ring conjugated structure and dicarboxylic acid groups facilitate stable hydrogen bonds and coordination bonds at both SnO 2 /SA and SA/PbI 2 interfaces. The self-transforming property of SA enables the dynamic bilateral anchoring at the buried interface, ultimately releasing residual stress and constructing a stable interfacial molecular bridge. The results show that SA molecular bridge not only can effectively inhibit the generation of diverse charged defects but also serves as an effective electron transport pathway, resulting in improved power conversion efficiency (PCE) from 23.19 to 25.50% and excellent stability at the maximum power point. Additionally, the PCEs of the flexible and large-area (1 cm 2 ) devices were increased to 24.92% and 24.01%, respectively, demonstrating the universal applicability of the bilateral anchoring to PSCs based on different substrates and larger area.
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FUEL
·
2024
·
IF 6.7
Xiaoxiao Ding,Yatao Yang,Weihong Jiao,Zequan Zeng,Zhanggen Huang
The heteroatom doping into the activated carbon (AC) has been proved to be one of powerful tools to remove dioxins from sintering flue gas. However, the fact that the intrinsic enhanced mechanism of specific nitrogen species still remains unanswered makes the choice and design of AC suitable for dioxins elimination difficult. Herein, nitrogen-doping AC with alterable N species were prepared by melamine modification to in-depth illuminate the promotional roles of N-containing groups on the adsorption of chlorobenzene (CB) (a model compound for dioxins) over ACs through experimental and density functional theory (DFT). The results demonstrated that the N-doping was obviously conducive to CB adsorption, and pyrrole N group with the strongest adsorption energy (−0.84 eV) between AC-pyrrole and CB was determined to be the key adsorption sites for CB. ACM600 with more pyrrole N group prominently improved the chemical adsorption of total adsorption amount from 8.18 % to 15.12 %. The adsorption mechanism of CB onto ACs was governed by physical adsorption and weak chemical adsorption, which was attributed to the synergistic effects of π-π stacking interaction and hydrogen bonds, and the π-π stacking interaction dominated the adsorption interactions. The introduction of heteroatom N enhanced the adsorption capacity by promoting the chemical reactivity and π-electron density distribution of AC, and forming more significant π-π stacking interaction with the π-acceptor. The study provided a sound theoretical guideline and scientific foundation for the design and estimation of carbonaceous materials for dioxins abatement.
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Nature Photonics
·
2024
·
IF 32.3
Mu Ge,Tan Yimei,Bi Cheng,Liu Yanfei,Hao Qun,Tang Xin
Photodetection over a broad spectral range is necessary for multispectral sensing and imaging. Despite the fact that broadband single-element detectors with high performance have been demonstrated with various low-dimensional materials, broadband focal plane array imagers have been rarely reported. Here we propose a stacked lead sulfide/mercury telluride colloidal quantum dot photodetector configuration with optimized graded energy gaps. This architecture allows for ultrabroadband spectral response from 0.4 to 5.0 µm, with responsivity values of 0.23, 0.31, 0.83 and 0.71 A W −1 at 0.4, 0.7, 2.2 and 4.2 µm, respectively. We also fabricate a focal plane array imager with a resolution of 640 × 512, a low photoresponse non-uniformity down to 6% and a noise equivalent temperature difference as low as 34 mK. We demonstrate broadband imaging by simultaneously capturing both short-wave infrared and mid-wave infrared information, as well as multispectral imaging in the red, green, blue, short-wave infrared and mid-wave infrared channels, using a set of optical filters.
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