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Air-stable hybrid perovskite solar cell by sequential vapor deposition in a single reactor
摘要： Here we demonstrate a facile two-step low-pressure vapor deposition of methyl-ammonium lead iodide (MAPbI3) perovskite films in a single reactor. Continuous, poly-crystalline lead iodide (PbI2) films were deposited in the first step and successfully converted to high quality perovskite films in the second step during exposure of PbI2 films to methyl-ammonium iodide (MAI) vapor. A complete conversion was realized after 90 minutes of exposure with an average grain size of 3.70 ± 1.80 μm. The perovskite conversion starts at the PbI2 surface through the intercalation reaction of PbI2 and MAI vapor molecules and progresses towards the PbI2/substrate interface. The coverage and quality of the perovskite thin film is controlled by that of the pre-deposited PbI2 film. The absorbance measurements confirmed air stability of the fully converted perovskite for 21 days, ascribed to its superior morphology and grain size. Finally, a planar single-junction perovskite solar cell with no additives or additional interfacial engineering was fabricated and tested under open-air conditions, yielding a best power conversion efficiency of 11.7%. The solar cell maintains 85% of its performance up to 13 days in open-air with relative humidity up to 80%.
关键词： planar device,Two-step vapor deposition,large grains,intercalation,air-stable
更新于2025-09-23 15:19:57
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Synthesis and photophysics of benzazole based triazoles with amino acid-derived pendant units. Multiparametric optical sensors for BSA and CT-DNA in solution
摘要： Herein we report the synthesis of a series of amino acid-derived triazoles by an organocatalytic cycloaddition reaction between azides and carbonyl compounds, catalyzed by a simple amine. These compounds present absorption maxima located in the UV-B ascribed to fully spin and symmetry allowed electronic transitions and a main fluorescence emission in the UV-A (~380 nm) with a relatively large Stokes shift (5700 cm-1). No significant solvatochromism was observed in both ground and excited states. Unexpectedly, the benzoxazole derivatives presented much higher fluorescence quantum yield values (40-80%) of compared to the sulfur analogues (3-6%). In addition, the DNA binding assays indicated that these compounds presented strong interaction with CT-DNA, which could be attributed to π-stacking and intermolecular hydrogen-bonding. The interaction of the benzazoles with bovine serum albumin (BSA) was also investigated, where a suppression mechanism was observed. In each case, docking was performed to better understand the observed interactions.
关键词： fluorescent sensor,DNA intercalation,protein detection,amino acid-derived triazole,docking studies
更新于2025-09-23 15:19:57
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Phase control of quasi-2D perovskites and improved light-emitting performance by excess organic cations and nanoparticle intercalation
摘要： The optoelectronic properties of quasi-two-dimensional organic–inorganic hybrid perovskites can be tuned by controlling the formation of Ruddlesden–Popper type phases, which enables diverse device applications such as photovoltaics and light-emitting diodes (LEDs). Herein, the influence of excess organic cations on the phase formation of (PEA)2MAn?1PbnBr3n+1 is systematically investigated with various mixing ratios to discover the phase distribution beneficial for light-emitting diodes. It is found that PEA cations exceeding Pb ions in molar ratio are required to produce small-n phases in the films with a strong photoluminescence, while excess MA cations enable the formation of more large-n phases. Low electrical conductivity inherent to the properties of quasi-2D perovskites is further lowered by the introduction of excess organic cations. This is overcome by the intercalation of zinc oxide (ZnO) nanoparticles (NPs) into the blocking layers composed of PEA cations. Importantly, these metal oxide NPs also modulate the phase distribution, enabling the realization of bright green quasi-2D perovskites with a better stability and a maximum luminance of nearly 60 000 cd m?2, which is the highest brightness compared to the so far reported quasi-2D perovskite LEDs incorporating organic cations.
关键词： phase control,excess organic cations,nanoparticle intercalation,light-emitting diodes,quasi-2D perovskites
更新于2025-09-19 17:15:36
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Boosting the Yield of MXene 2D Sheets via a Facile Hydrothermal-Assisted Intercalation
摘要： Ti3C2Tx (MXene) exhibits attractive properties in different applications. However, traditional synthesis leads to unsatisfactory yield of two-dimensional (2D) Ti3C2Tx, e.g. lower than 20%, which stems from the strong interactions of potential Ti-Ti bonds and residual Ti-Al bonds between the adjacent Ti3C2 layers, hindering the effective intercalation and delamination. Herein, we propose a facile hydrothermal-assisted intercalation (HAI) strategy to boost the yield of 2D sheets, achieving a record high value of 74%. This HAI assists the diffusion and intercalation of reagent effectively, promoting the subsequent delamination; meanwhile, antioxidant is applied to protect these Ti3C2Tx from oxidation during HAI process. Therefore, massive Ti3C2Tx 2D sheets can be easily synthesized. Thanks to the synergistic effect of high conductivity and substantial terminated functionalities, these Ti3C2Tx 2D sheets show promising application in supercapacitor, providing a high capacitance of 482 F g-1. Besides, the ultrafast carrier dynamics results of Ti3C2Tx 2D sheets clearly imply the promising application in photocatalysis, due to the relatively long bleaching relaxation time. Our work not only paves the way for the mass production of Ti3C2Tx 2D sheets, but also provides insights into their electronic and optical properties.
关键词： facile,Hydrothermal-assisted intercalation (HAI),high yield,MXene,Ti3C2Tx
更新于2025-09-19 17:15:36
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Intercalated complexes of 1T′-MoS <sub/>2</sub> nanosheets with alkylated phenylenediamines as excellent catalysts for electrochemical hydrogen evolution
摘要： Two-dimensional layered MoS2 has recently been considered as an excellent catalyst for the water-splitting hydrogen evolution reaction (HER). Herein, we synthesize 1T0 phase MoS2 that was intercalated with a series of alkylated p-phenylenediamines (PDs). The substituted N atoms produced S vacancies, leading to a composition of MoS2-2xNx (x = 0.1). The more abundant methyl groups induce a larger charge transfer, resulting in excellent HER performance: for tetramethyl PD, the overpotential is 0.15 V at 10 mA cm-2 with a Tafel slope of 35 mV dec-1. The catalytic activity of the complexes depends on the concentration of the intercalated molecules, showing an optimum at a concentration of 8 mol%. First-principles calculations showed that the intercalated complexes (1T0 phase) having N atom–S vacancy (N–VS) pairs are stabilized by a large charge transfer from the PD molecules that is enhanced by the methyl groups (i.e., 0.40e–0.84e per molecule at 6.25 mol% intercalation). The charge transfer increases the density of states at and just above the Fermi level, thereby increasing the electron concentration at low cathodic bias. The active sites for the Volmer reaction are found to be N atoms in the proximal N–VS pairs. The activation barrier for the Heyrovsky reaction becomes higher at higher concentrations of the intercalants, suggesting that the experimental HER performance is also kinetically controlled.
关键词： catalysis,first-principles calculations,MoS2,hydrogen evolution reaction,intercalation
更新于2025-09-19 17:15:36
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Synthesis of Monolayer Blue Phosphorus Enabled by Silicon Intercalation
摘要： The growth of entirely synthetic two-dimensional (2D) materials could further expand the library of naturally occurring layered solids and provide opportunities to design materials with finely tunable properties. Among them, the synthesis of elemental 2D materials is of particular interest as they represent the chemically simplest case and serve as model system for exploring the on-surface synthesis mechanism. Here, a pure atomically-thin blue phosphorous (BlueP) monolayer is synthesized via silicon intercalation of the BlueP-Au alloy on Au(111). The intercalation process is characterized at the atomic scale by low-temperature scanning probe microscopy, and further corroborated by synchrotron radiation-based x-ray photoelectron spectroscopy measurements. The evolution of the band structures from BlueP-Au alloy into Si intercalated BlueP are clearly revealed by angle-resolved photoemission spectroscopy and further verified by density functional theory calculations.
关键词： MBE,STM,Si intercalation,monolayer blue phosphorus,ARPES
更新于2025-09-16 10:30:52
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Polymer light emitting diodes (PLEDs): An update review on current innovation and performance of material properties
摘要： Conventional lighting systems, such as the incandescent light bulbs used on the offshore oil rigs are becoming obsolete due to high energy consumption, poor life span and additional costs of waste treatment and disposal. Furthermore, they are susceptible to fire when exposed to an oxygen rich environment, posing a threat to the oil rig workers. Recent advances have led to the development of polymer light emitting diodes (PLEDs) as substitutes to these prevailing light sources. The PLEDs have advantages over the incandescent bulbs, for being durable, low energy consumption and environmental friendly. Consequently, the increasing research collaborations among the academic researchers and industrial stakeholders are gaining momentum in ensuring the advancements of PLEDs in terms of economic value and performance. This paper is aimed at reviewing the recent advances in the field of current innovation and performance of PLEDs materials. The paper focuses on the important experiments on the PLEDs materials towards the upgrading and modification of anode and holes injection/transporting layer and the influence of doping effect. In spite of that, this paper discovered that synthetic materials, such as synthetic silicates are the commonly used materials in the current PLEDs, and recommends the incorporation of cost effective inorganic clay-polymer nanocomposite-based LEDs as a way forward to reducing the material costs and provide more environmental friendly PLEDs materials.
关键词： doping,insertion,Polymer light emitting diodes,intercalation,materials
更新于2025-09-12 10:27:22
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Supra-Materials Nanoarchitectonics || Functional Layered Compounds for?Nanoarchitectonics
摘要： Inorganic layered materials are composed of stacked nanometer-thick inorganic crystalline sheets, which are weakly bound by electrostatic, van der Waals, or hydrogen bonding interactions. These materials are obtained from natural soil or are synthesized by hydrothermal heating or calcination at high temperature from mixture of raw chemicals. Depending on the chemical composition, layered materials possess functionalities such as conductivity, semiconductivity, magnetic property, luminescence property, and photocatalytic activity. In this section, recent development of nanoarchitectonics with layered materials as achieved by intercalation and exfoliation technique are reviewed as summarized in Fig. 7.1.
关键词： Functional Layered Compounds,Nanoarchitectonics,Nanosheets,Intercalation Compounds,Photofunctions
更新于2025-09-10 09:29:36
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PVP intercalated metallic WSe<sub>2</sub> as NIR photothermal agents for efficient tumor ablation
摘要： Transition metal dichalogenides (TMDCs) with unique layered structures hold promising potential as transducers for photothermal therapy. However, the low photothermal conversion efficiency and poor stability in some cases limit their practical applications. Herein, we demonstrate the fabrication of an ultrathin homogeneous hybridized TMDC nanosheets and their use for highly efficient photothermal tumor ablation. In particular, the nanosheets were composed of metallic WSe2 intercalated with polyvinylpyrrolidone (PVP), which was facilely prepared through a solvothermal process from the mixture of selenourea crystals, WCl6 powder along with PVP polymeric nanogel. Our characterizations revealed the obtained nanosheets exhibited excellent photothermal conversion efficiency, improved biocompatibility and physiological stability attributing to the combined merits of metallic phase of WSe2 and hydrophilic PVP insertion. Both the histological analysis of vital organs and in-vitro/in-vivo tests confirmed the nanosheets as actively effective and biologically safe in this phototherapeutic technique. Findings from this non-invasive experiment clearly emphasize the explorable therapeutic efficacy of layered-based hybrid agents in future cancer treatment planning procedures.
关键词： Solvothermal synthesis,intercalation,metallic tungsten diselenide,photothermal therapy
更新于2025-09-10 09:29:36
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Preparation of α-Zirconium Phosphate Nanosheets Stacked Solid Films with High Transparency and Intercalating with Cationic Free-Base Porphyrins
摘要： In this paper, a method is presented for the preparation of a transparent thin solid film by stacking α-zirconium phosphate nanosheets (αZrPNSs), and intercalating with cationic free-base porphyrin (TMPyP) molecules at the interlayer space. The αZrPNSs staked solid films with high transparency were firstly prepared by the filtration-film transfer method of the αZrPNSs colloid suspension. Immersion of the transparent film into a mixed aqueous solution of the TMPyP and n-butylamine was found to be the most effective intercalation method. In this film, the TMPyP cations existed as momomer species.
关键词： Intercalation,α-Zirconium Phosphate Nanosheet,Transparent Thin Solid Film
更新于2025-09-09 09:28:46