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Hyperthermia Induced by Near-Infrared Laser-Irradiated CsWO3 Nanoparticles Disintegrates Preformed Lysozyme Amyloid Fibrils
摘要： This research study attempts to prove the concept of the applicability of hyperthermia to treating the lysozyme amyloid fibrils (LAF)’s self-assembled fibrillary aggregates by a feedback-modulated temperature controller ranging from 26 °C to 80 °C, and separately, by near-infrared (NIR) laser-irradiated cesium tungstate (CsWO3) nanoparticle (NPs). The dependence of the final morphology of the amyloidal assembly on external heating and the photothermal effect of the NPs on treating the fibrillary assembly were investigated and analyzed. Experimentally, atomic force microscopy (AFM), optical stereoscopy, and scanning electron microscopy (SEM) were used primarily to ensure mutual interaction between LAF and NPs, optically elucidate the surface contour and final fibrillary assembly upon the influence of thermal treatment, and further reveal fine-details of the optical samples. Finally, conclusive remarks are drawn that the fibrillary structures doped with the NPs exhibit an increasing degree of unique orthogonality. As the temperature rises, utter deformation of the dendritic structures of fibrillary assemblies at 70 °C was found, and NIR laser-irradiated CsWO3 NPs have been demonstrated to be useful in topically destructing pre-assembled LAFs, which may be conducive to the future development of neurodegenerative therapeutic techniques.
关键词： neurodegenerative diseases,self-assembled nanocomposite,lysozyme amyloid fibrils,hyperthermia,cesium tungsten oxide nanoparticles
更新于2025-09-16 10:30:52
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Room temperature synthesis of cesium lead bromide perovskite magic sized clusters with controlled ratio of carboxylic acid and benzylamine capping ligands
摘要： We demonstrate the synthesis of cesium lead bromide (CsPbBr3) perovskite magic sized clusters (PMSCs) and how to control the transformation from CsPbBr3 perovskite quantum dots (PQDs) to PMSCs by varying the amount of organic carboxylic acids (CAs), including mesitylacetic acid (MAA), oleic acid (OA), and phenylacetic acid (PAA), along with benzylamine (BZA) as capping ligands at room temperature. The PQDs and PMSCs are characterized by means of XRD, UV/vis, photoluminescence (PL), time-resolved PL (TRPL), and X-ray-photoelectron spectroscopy (XPS). The concentration of CAs affects the excitonic absorption of both the CsPbBr3 PMSCs (λ ? 389–428 nm) and CsPbBr3 PQDs (λ ? 460–516 nm), with high concentration of CAs favoring CsPbBr3 PMSCs over PQDs. With PAA at 45.45 mM, pure CsPbBr3 PMSCs can be generated, which does not happen for MAA or OA, suggesting that PAA is a stronger ligand than MAA and OA. The results suggest that PMSCs require better passivation or stronger ligands than PQDs. This study establishes a simple and general method for synthesizing CsPbBr3 PMSCs using a combination of BZA and CA capping ligands as a highly effective dual passivation system.
关键词： Controlled ratio of capping ligands,Room temperature,Perovskite quantum dots (PQDs),Perovskite magic sized clusters (PMSCs),Cesium lead bromide perovskite
更新于2025-09-16 10:30:52
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Slow and fast single photons from a quantum dot interacting with the excited state hyperfine structure of the Cesium D1-line
摘要： Hybrid interfaces between distinct quantum systems play a major role in the implementation of quantum networks. Quantum states have to be stored in memories to synchronize the photon arrival times for entanglement swapping by projective measurements in quantum repeaters or for entanglement purification. Here, we analyze the distortion of a single-photon wave packet propagating through a dispersive and absorptive medium with high spectral resolution. Single photons are generated from a single in(Ga)As quantum dot with its excitonic transition precisely set relative to the cesium D1 transition. the delay of spectral components of the single-photon wave packet with almost Fourier-limited width is investigated in detail with a 200 MHz narrow-band monolithic Fabry-Pérot resonator. Reflecting the excited state hyperfine structure of Cesium, “slow light” and “fast light” behavior is observed. As a step towards room-temperature alkali vapor memories, quantum dot photons are delayed for 5 ns by strong dispersion between the two 1.17 GHz hyperfine-split excited state transitions. Based on optical pumping on the hyperfine-split ground states, we propose a simple, all-optically controllable delay for synchronization of heralded narrow-band photons in a quantum network.
关键词： slow light,optical pumping,single-photon wave packet,quantum networks,quantum dot,cesium D1 transition,fast light,Fabry-Pérot resonator
更新于2025-09-16 10:30:52
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Direct Synthesis of Quaternary Alkylammonium Capped Perovskite Nanocrystals for Efficient Blue and Green Light-Emitting Diodes
摘要： Cesium lead halide nanocrystals (CsPbX3 NCs) are newcomer inorganic light sources covering the entire visible spectral range and exhibiting near-unity efficiencies. While the last years have seen rapid progress in green- and red-electroluminescence from CsPbX3 NCs, the development of blue counterparts remained rather stagnant. Controlling the surface state of CsPbX3 NCs had proven to be a major factor governing the efficiency of the charge injection and for diminishing the density of traps. Although didodecyldimethylammonium halides (DDAX, X=Br, Cl) had been known to improve the luminescence of CsPbX3 NCs when applied post-synthetically, they had not been used as a sole long-chain ammonium ligand directly in the synthesis of these NCs. Herein we report a facile, direct synthesis of DDAX-stabilized CsPbX3 NCs. We then demonstrate blue and green light-emitting diodes, characterized by the electroluminescence at 463-515 nm and external quantum efficiencies of 9.80% for green, 4.96% for sky-blue and 1.03% for deep-blue spectral regions.
关键词： Cesium lead halide nanocrystals,DDAX-stabilized,external quantum efficiencies,light-emitting diodes,electroluminescence
更新于2025-09-16 10:30:52
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Waterproof Cesium Lead Bromide Perovskite Lasers and Their Applications in Solution
摘要： The many advantageous optoelectronic properties of lead halide perovskites have made them promising materials in both solar cells and light source applications. However, lead halide perovskites are soluble in polar solvents, which hinders their practical applications. Thus, the effective protection of perovskite against polar solvents is of great significance. Herein, we report waterproof CsPbBr3 nanoplate (NP) laser protected by large-scale on-chip micro process compatible atomic layer deposition (ALD) Al2O3. 50 nm Al2O3 coated CsPbBr3 NPs can continuously lase in water for over an hour, and can still lase after being immersed in water for a month. Moreover, the lasing behaviors of the 20 nm Al2O3 coated CsPbBr3 NP, in the mixed solution of water and glycerine with the refractive index ranging from 1.33 to 1.47, are also studied. As the environmental refractive index increases, the NP laser goes through a mode selection process, showing single-mode (540.3 nm) to dual-mode and to single-mode (533.9 nm) lasing behavior, which is caused by mode competition resulting from the decrease of quality factor (Q factor) and the blue-shift of the material’s gain spectra. Besides, lasing thresholds of the CsPbBr3 NP increase with the environmental refractive index, which can be utilized for sensing with a measured sensitivity of 129.7 μJ cm?2 RIU?1 (per refractive index unit) (388.2 μJ cm?2 RIU?1) for the long (short) wavelength lasing mode. Our work demonstrates that the ALD Al2O3 protection method can effectively protect CsPbBr3 against polar solvents, enhance the material’s stability, and enable perovskite’s practical applications in both on-chip integration and solvent systems.
关键词： cesium lead bromide,waterproof,nanolaser,refractive index sensor,perovskite
更新于2025-09-12 10:27:22
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Near infrared radiation shielding using CsxWO3 Nanoparticles for infrared mini Light-Emitting Diodes
摘要： Recently, near infrared LEDs have been used in small electronic devices due to the trend of manufacturing compact systems. The intensity of near infrared (NIR) optical device needs to be moderated if the chip emits too much power. In tradition, color pigments are used as additives in the encapsulant of LEDs to reduce the intensity of over irradiated NIR, a strategy which results in unaesthetic appearance. Cesium doped tungsten trioxide (CsxWO3) nanoparticles (NPs) have good near infrared absorption ability. Applying very few amount of CsxWO3 NPs into the encapsulation materials of NIR optical device can decrease NIR intensity while still maintain high visible light transmittance without losing aesthetic touch of those devices such as LED transmitters. The addition of only 0.0021 wt% CsxWO3/PMA dispersion in epoxy encapsulant can drop 15.5% NIR (860 nm) intensity but barely reduce visible light (only 3.2% at 450 nm). The excellent performance of CsxWO3 NPs; i.e., good NIR absorption and visible light transmission properties, can be suitable for maintaining the moderate luminescence intensity of small optoelectronic devices like NIR mini- or micro- light-emitting diodes.
关键词： nanoparticles,Mini-LED,Near-infrared shielding,nanocomposites,Cesium doped tungsten trioxide
更新于2025-09-12 10:27:22
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Double perovskite Cs4CuSb2Cl12 microcrystalline device for cost effective photodetector applications
摘要： Recently reported double perovskites (DPs), Cs4CuSb2Cl12 has led to the development of a new lead free perovskite. It is 1 eV band gap material. The perovskite microcrystals were synthesized via liquid phase method. This was investigated as active solar energy materials for visible-light photodetector. The microcrystalline device was made in a single-step printable Cs4CuSb2Cl12/carbon materials composite paste. 10 wt % active material composite was found to be the best candidate for the highest responsivity, 10 ―3 A/W and detectivity, 108 J. One-step printing of the composite paste can be used for cost effective photodetector applications.
关键词： Photodetector,Solar energy materials,Cesium Copper Antimony Chloride (Cs4CuSb2Cl12),Carbon materials,Double Perovskite
更新于2025-09-12 10:27:22
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Precise stress control of inorganic perovskite films for carbon-based solar cells with an ultrahigh voltage of 1.622?V
摘要： All-inorganic cesium lead bromide (CsPbBr3) perovskite solar cell is one promising candidate to balance high efficiency and poor stability of organic-inorganic hybrid photovoltaics. The charge carrier transport can be maximized for high-efficiency devices through precise stress control during perovskite grain growth process to obtain high-quality full-bromine CsPbBr3 halide films. We present here the monolayer-aligned and large-grained CsPbBr3 perovskite films through precise control of crystallization temperature of PbBr2 film because the lattice volume is enlarged by 2.18 times during the phase conversion from PbBr2 to CsPbBr3, which helps to minimize residual-stress-induced grain boundaries and defect-induced charge recombination. Upon further interfacial modification by nitrogen doped carbon quantum dots, the hole transporting materials free, all-inorganic CsPbBr3 perovskite solar cell achieves a champion efficiency as high as 10.71% with an ultrahigh open-circuit voltage of 1.622 V. Moreover, the unencapsulated solar cell demonstrates remarkable long-term stability in 85% humidity in air atmosphere.
关键词： Stability,Strain engineering,Crystal growth,Cesium lead bromide,Charge recombination,Inorganic perovskite solar cell
更新于2025-09-12 10:27:22
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Precursor-Mediated Synthesis of Shape-controlled Colloidal CsPbBr <sub/>3</sub> Perovskite Nanocrystals and their Nanofiber-Directed Self-assembly
摘要： Shape control is often necessary to tune the optical and electronic properties of nanocrystals (NCs) and is mostly achieved through manipulation of surface ligands and processing conditions. Here we present a versatile synthesis of colloidal CsPbBr3 perovskite NCs of various shapes (nanorods, nanocubes and nanoplatelets) from an inexpensive steroidal Cs precursor: cesium cholate (CsCh). Cesium cholate has several advantages over the most commonly used Cs-precursor (cesium oleate or Cs2CO3 or CsOAc) such as low-cost, non-hygroscopicity and better reproducibility in the perovskite synthesis. Due to the solubility of this Cs-precursor in polar solvents such as methanol, a miniscule polar environment is created during the nucleation and growth of the nanocrystals leading to the serendipitous formation of nanorods at 180 ℃, whereas using a biphasic mixture of 1-octadecene and methanol, the morphology changes to nanocubes. By lowering the reaction temperature (90 ℃), nanoplatelets with 8-9 monolayers thicknesses are formed. These colloidal NCs of variety of shapes are strongly luminescent with a green emission having narrow emission linewidths (16-17 nm) and high quantum yields (96% for nanocubes, 94% for nanoplatelets). Furthermore, hybrid materials of nanocubes and organogel of a dimeric bile acid-derived ester gelator are obtained through co-assembly in which nanocubes arrange along nanofibers with stable, sharp and bright green emission. This enables spatial ordering of nanocubes ranging from micron to centimeter scale in thin films, which is crucial for advanced optoelectronic applications. To date, there is no report in literature on the anisotropic organization of perovskite CsPbBr3 nanocubes triggered by supramolecular co-assembly involving organogel nanofibers.
关键词： nanocubes,organogel,Shape control,hybrid materials,nanorods,cesium cholate,nanoplatelets,supramolecular co-assembly,colloidal CsPbBr3 perovskite NCs
更新于2025-09-12 10:27:22
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A model for real time, <i>in situ</i> estimation of cesium coverage on metal substrate using infrared imaging under vacuum
摘要： The present work is to develop an infra-red (IR) camera based in situ diagnostic tool for the determination of cesium (Cs) coverage suitable for ion source applications. Cs seeding is done to reduce the surface work function that enhances the surface assisted negative hydrogen ion production. The temporal Cs deposition on a metal surface (for, e.g., tungsten or molybdenum) follows Langmuir adsorption isotherm (LAI) kind of behavior. The surface temperature varies while the Cs deposition is reflected in the IR camera temperature measurements for a constant surface emissivity value. In this paper, a model on the relationship between Cs coverage in correlation with surface emissivity and temperature variation based on the theory of LAI is presented. A surface ionization probe (SIP) in the form of a cathode-anode assembly together with an IR camera viewing arrangement is designed to measure the Cs flux and the surface temperature simultaneously to test our model. In the present experiment, the Cs flux measurement using SIP is validated with a standard quartz crystal microbalance (QCM). The proposed model would be useful to correlate Cs coverage on plasma grid-like surface conditions under negative ion source relevant vacuum conditions.
关键词： surface ionization probe,infra-red camera,cesium coverage,quartz crystal microbalance,Langmuir adsorption isotherm
更新于2025-09-12 10:27:22