- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Bio-Inspired Structural Colors based on Linear Ultra-High Molecular Weight Block Copolymers
摘要： Ultra-high molecular weight (UHMW) block copolymers (BCPs) are promising candidates for the fabrication of photonic materials. Here, we demonstrate the synthesis and self-assembly capability of well-defined amphiphilic UHMW BCPs with overall molar masses up to 4432 kg mol-1 obtained via living anionic polymerization. BCP micelles featuring hydrodynamic diameters in the range of the wavelength of the visible light to the near infrared region (300-1143 nm) are used for colloidal crystal formation. By varying the BCP composition brilliant structural colours can be observed. Microphase separation of the UHMW BCPs in the bulk state reveals uniform domains and showing blue to green structural color transitions. Finally, we provide examples of how BCP structural control can be used to generate reversibly switchable solvatochromatic optical sensors.
关键词： morphology,block copolymers,structural colors,self-assembly,anionic polymerization,micellar photonic crystals,photonic materials
更新于2025-09-23 15:23:52
-
Hierarchical Photonic Pigments <i>via</i> the Confined Self-Assembly of Bottlebrush Block Copolymers
摘要： Hierarchical, structurally colored materials offer a wide variety of visual effects that cannot be achieved with standard pigments or dyes. However, their fabrication requires simultaneous control over multiple length-scales. Here we introduce a robust strategy for the fabrication of hierarchical photonic pigments via the confined self-assembly of bottlebrush block copolymers within emulsified microdroplets. The bottlebrush block copolymer self-assembles into highly ordered concentric lamellae, giving rise to a near perfect photonic multi-layer in the solid-state, with reflectivity up to 100%. The reflected color can be readily tuned across the whole visible spectrum by either altering the molecular weight or by blending the bottlebrush block copolymers. Furthermore, the developed photonic pigments are responsive, with a selective and reversible color change observed upon swelling in different solvents. Our system is particularly suited for the scalable production of photonic pigments, arising from their rapid self-assembly mechanism and size-independent color.
关键词： photonic crystals,confined self-assembly,microspheres,structural colors,bottlebrush block copolymers
更新于2025-09-23 15:23:52
-
Structural Coloration with Nonclose-Packed Array of Bidisperse Colloidal Particles
摘要： Colloidal crystals and glasses have their own photonic effects. Colloidal crystals show high reflectivity at narrowband, whereas colloidal glasses show low reflectivity at broadband. To compromise the opposite optical properties, a simple means is suggested to control the colloidal arrangement between crystal and glass by employing two different sizes of silica particles with repulsive interparticle potential. Monodisperse silica particles with repulsive potential spontaneously form crystalline structure at volume fraction far below 0.74. When two different sizes of silica particles coexist, the arrangement of silica particles is significantly influenced by two parameters: size contrast and mixing ratio. When the size contrast is small, a long-range order is partially conserved in the entire mixing ratio, resulting in a pronounced reflectance peak and brilliant structural color. When the size contrast is large, the long-range order is rapidly reduced along with mixing ratio. Nevertheless, a short-range order survives, which causes low reflectivity at a broad wavelength, developing faint structural colors. These findings offer an insight into controlling the colloidal arrangements and provide a simple way to tune the optical property of colloidal arrays for structural coloration.
关键词： colloidal arrays,colloids,mechanochromism,structural colors,repulsive potential
更新于2025-09-23 15:22:29
-
Optical Properties of Individual Aragonite Plates from Nacre
摘要： The unique structural architecture of nacre from sea shells (e. g., mussel, pearl oyster, and abalone shells) is the basis of this substance’s brilliant iridescent coloration. In fact, nacre consists of alternating bilayers of plate-shaped aragonite and an organic binder. In this paper, we first report the optical characteristics of individual aragonite plates derived from nacre. A simple chemical method is employed to disintegrate nacre without structural and polymorphism changes. Implementation of this method enable us to investigate the optical properties of individual aragonite plates. Evidence indicate that most light is transmitted by aragonite plates, a phenomenon that contributes substantially to the fantastic iridescent colors displayed by nacre. Reflected light, on the other hand, displays wavelength selectivity that depends on the thickness of the aragonite plates. As typical material applications, natural aragonite plates are utilized as transparent fillers and as a pigment for surface coating. Aside from their use as optical materials, aragonite plates can also be employed as a solid support for the growth of metal nanoparticles and utilize for surface-enhanced Raman spectroscopy.
关键词： transfer matrix method,nacre,structural colors,aragonite plates
更新于2025-09-23 15:21:21
-
Improving efficiency and stability of colorful perovskite solar cells with two-dimensional photonic crystals
摘要： Colorful solar cells have been much sought after because they can generate electricity and concurrently satisfy ornamentation purposes. Owing to their outstanding power conversion efficiency and flexibility in processing, perovskite solar cells (PSCs) have the great potential to become both efficient and aesthetically appealing. Here, we specially devise and fabricate two novel electron transport layers (ETLs) for PSCs with two-dimensional (2D) photonic crystal structures, namely the 2D inverse opal (IO) structured SnO2 (IOS) and SnO2-TiO2 composite (IOST), using the template-assisted spin-coating method. The synergistic structure and material modifications to the ETLs lead to a number of unique features, including the remarkable electron transfer ability, vivid colors and good protection to the infiltrated perovskite films. Furthermore, the IOS and IOST ETLs are effectively incorporated into the CH3NH3PbI3-based PSC devices that deliver the best efficiency of 16.8% with structural colors.
关键词： structural colors,two-dimensional photonic crystals,SnO2,electron transport layers,TiO2,perovskite solar cells
更新于2025-09-23 15:21:01
-
Self-Powered Humidity Sensor Using Chitosan-Based Plasmonic Metal-Hydrogel-Metal Filters
摘要： A tunable Fabry–Pérot resonator is realized using metal–insulator–metal structure, in which the insulator is chitosan hydrogel. The chitosan swells in response to changes in relative humidity; this change affects transmissive structural color of the multilayer structure. This tunable resonator is utilized for a humidity sensor combined with a photovoltaic cell. The change in current through the photovoltaic cell provides rapid precise measurement of relative humidity, and the change in color of the multilayer provides an approximate, remotely-readable estimate. The response requires no power, so the device has numerous sensing applications.
关键词： Fabry–Pérot etalon,structural colors,tunable color filter,tunable structural colors,interferometric colors,metal–insulator–metal
更新于2025-09-23 15:19:57
-
Simultaneous Fulla??Color Printing and Holography Enabled by Centimetera??Scale Plasmonic Metasurfaces
摘要： Optical metasurfaces enable novel ways to locally manipulate light’s amplitude, phase, and polarization, underpinning a newly viable technology for applications, such as high-density optical storage, holography, and displays. Here, a high-security-level platform enabled by centimeter-scale plasmonic metasurfaces with full-color, high-purity, and enhanced-information-capacity properties is proposed. Multiple types of independent information can be embedded into a single metamark using full parameters of light, including amplitude, phase, and polarization. Under incoherent white light, the metamark appears as a polarization- and angle-encoded full-color image with flexibly controlled hue, saturation, and brightness, while switching to multiwavelength holograms under coherent laser illumination. More importantly, for actual applications, the extremely shallow functional layer makes such centimeter-scale plasmonic metamarks suitable for cost-effective mass production processes. Considering these superior performances of the presented multifunctional plasmonic metasurfaces, this work may find wide applications in anticounterfeiting, information security, high-density optical storage, and so forth.
关键词： structural colors,plasmonics,metasurfaces,holograms
更新于2025-09-23 15:19:57
-
Self-assembly of colloidal Poly(St-MMA-AA) core/shell photonic crystals with tunable structural colors of the full visible spectrum
摘要： This study used the copolymer emulsion method to synthesize colloidal monodisperse core/shell microspheres composed of the poly(styrene-co-methyl methacrylate-co-acrylic acid) [Poly(St-MMA-AA)]. Colloidal photonic crystal (CPhC) films have prepared by using polymer composite microspheres and successfully fabricated via natural sedimentation. The synthesized results of polymer composite microsphere exhibited uniform and good morphology. The resultant of CPhC color films demonstrated vividly structural colors due to 3D CPhC nanostructures. The structural colors over full visible spectra could be tuned by controlling the filling factor of crystals and diameter of microspheres according to the Bragg law. Additionally, the structural color of Poly(St-MMA-AA) CPhC films has measured under the standard colorimetric system. This study demonstrated a approach to fabricate tunable structural color for numerous applications.
关键词： Photonic crystals,Polymer microspheres,Structural colors,Colloidal crystals,Self-assembly
更新于2025-09-10 09:29:36