Low Optical Loss and Bent Waveguides: Crystals of a One-Dimensional Pt₁Ag₁₄ Nanocluster

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Март 28, 2025

Photoluminescent nanoclusters are promising materials for optical waveguides. However, their photon transmission under mechanical stress is very challenging. Here, we report an low-loss metallic nanocluster crystal, [Pt1Ag14(DPPP)6Cl4](SbF6)2 (DPPP = 1,3-bis(diphenylphosphino) propane), which exhibits stable performance with loss coefficient of 7.15 × 10–4 dB·μm–1─lower than most reported inorganic, organic, and hybrid materials. The Pt1Ag14 crystals maintain excellent stability deformation, difference only 0.15 10–3 dB·μm–1 before after stress. Reasonable molecular design endows robust flexibility, resulting in bending radius being smaller that similar structures. Structural analysis has shown multiple π···π, C–H···π, C–H···F intra- intermolecular interactions originating from the ligands between counterions ensure crystal Metallic low flexibility generated by rational offer candidates fields active waveguides flexible electronic

Язык: Английский

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Suppression of iron oxidation problem into PVDF/PMMA composites with ceramic additives: SiO2 vs. TiO2

Polymer, Год журнала: 2025, Номер unknown, С. 128100 - 128100

Опубликована: Янв. 1, 2025

Язык: Английский

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Bioinspired Nanoscale 3D Printing of Calcium Phosphates Using Bone Prenucleation Clusters

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 28, 2025

Abstract Calcium phosphates (CaPs) are ubiquitous in biological structures, such as vertebrate bones and teeth, have been widely used biomedical applications. However, fabricating CaPs at the nanoscale 3D has remained a significant challenge, particularly due to limitations current nanofabrication techniques, two‐photon polymerization (2pp), which not applicable for creating CaP nanostructures. In this study, novel approach is presented print structures with unprecedented resolution of ≈300 nm precision, achieving level detail three orders magnitude finer than any existing additive manufacturing techniques CaPs. This advancement achieved by leveraging bioinspired chemistry, utilizing bone prenucleation nanoclusters (PNCs, average size 5 nm), within photosensitive resin. These form highly transparent photoresist, overcoming light‐scattering typically associated larger calcium phosphate‐based nanoparticles. method only allows nanopatterning on diverse substrates, but also enables precise control microstructure down submicron grains. The paves way developing metamaterials, lightweight damage‐tolerant materials, cell‐modulating interfaces, precision‐engineered coatings.

Язык: Английский

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Adjustable Ultra‐Light Mechanical Negative Poisson's Ratio Metamaterials with Multi‐Level Dynamic Crushing Effects

Small, Год журнала: 2024, Номер 20(43)

Опубликована: Июль 14, 2024

Mechanical metamaterials with multi-level dynamic crushing effects (MM-MLs) are designed in this study through coordinate transformation and mirror arrays. The mechanical of the diameter length ratio struts connecting rods, Euler angles, cell numbers on properties investigated separately. MM-ML can exhibit significant two-level platform stress, local cells first stress stage undergo rotational motion, while second mainly involves collapse compression bending. Although increasing rods increase range Poisson's ratio, it will reduce level energy absorption. Increasing angle strain interval improve absorption capacity. In addition, number maintaining a constant relative density effectively enhance has parameter controllability, achieve different regions, ranges ratios, requirements according to application scenario, demonstrate functional diversity compared existing research. design scheme provide ideas for adaptive protection requirements.

Язык: Английский

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Atomically Engineered Trimetallic Nanoclusters Toward Enhanced Photoluminescence and Photoinitiation Activity

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 13, 2025

Abstract Precise doping is of vital significance for atomic engineering and the establishment structure‐property relationships in nanocluster (NC) chemistry. Herein, two novel trimetallic MAu 18 Cd 3 (M = Pd/Pt) NCs that are derived from M‐doped Au 25 templates 24 reported, which central M atom surface‐motif atoms concurrently achieved. Compared to original templates, Cd‐induced surface enhances rigidity structural framework enlarges HOMO‐LUMO gaps , significantly improving photoluminescent efficiency by suppressing nonradiative relaxation. The critical role (Pd/Pt) dopant photoluminescence, regulates rate radiative decay excited‐state electrons, has also been substantiated. More notably, doped case PtAu exhibits excellent photoinitiation activity 3D two‐photon printing with a high resolution ≈140 nm, may be attributed prolonged excited state. Overall, this work provides generalized routine precise synthesis multi‐metal concurrent enhancements photoluminescence activity, expected stimulate further research design preparation multi‐functional, NCs.

Язык: Английский

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3D Nanoprinting of Multifunctional MgO Transparent Ceramics

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Май 15, 2025

Transparent ceramics face fabrication challenges in achieving high-resolution 3D architectures with optical isotropy and thermal/mechanical stability. While two-photon lithography (TPL) enables nanoscale printing, existing inorganic TPL materials suffer from opacity, big shrinkage, costly postprocessing. Here, we report a solvent-free, high-loading Mg-cross-linked photoresist for of sub-200 nm MgO transparent high fidelity via two-step sintering. With high-purity cubic lattice, defect-free fully dense structures exhibit wide range thicknesses. Demonstrations include excellent imaging, focusing capabilities, stable mechanical durability under various harsh working conditions, like temperature high-energy laser radiation. This simple relatively low-cost method also showcases fiber-integrated micro-optic device high-intensity systems. synergy precision, wide-thickness transparency, outstanding stability will position as next-generation components to make micro-optical devices damage thresholds.

Язык: Английский

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Mechanical Behavior of Nanocluster-Based Nanocomposites Made Using Two-Photon Lithography

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Май 29, 2025

Mechanical metamaterials with nanoscale features exhibit exceptional properties, including high specific strength, modulus, energy absorption, and recoverability. The ability to fabricate these out of complex nanocomposites could further boost their mechanical properties. Recently, two-photon lithography (TPL) has been used architected microlattices high-performance polymer that contain metallic nanoclusters. However, the mechanism leads unique properties nanocomposites, such as strain hardening, remains unclear. Here, TPL is nanocluster-based nanocomposite micropillars investigate how nanocluster content chemical bonding matrix impact are tested in compression at rates 10-3 102 s-1, after heat treatment up 550 °C. Findings show nanoclusters establish hydrogen bonds strong interfacial polymer, restricting chain movement significantly enhancing strength compared unfilled polymers.

Язык: Английский

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