Carbon dots promoted photonic crystal for optical information storage and sensing

Yellow‐Emissive Carbon Dots with High Solid‐State Photoluminescence

“…[6] These characteristics make CDs attractive for various applications including bioimaging, [7] anti-counterfeiting, [8] photocatalysis, [9] optoelectronic devices, [10] ionic detection, [11] etc. [12] Since any of the optical applications would benefit from the use of brightly fluorescent CDs, the exploration of synthetic strategies for fabricating CDs with high photoluminescence (PL) quantum yield (QY) has become a hot research topic. [13][14][15] Much of this research has resulted in blue-emissive CDs (B-CDs), [4,16,17] Here, we report the synthesis, chemical structure, and high PL QY of Y-CDs, as well as their potentials for high-performance LSCs and yellow phosphors of optoelectronic devices.…”

Fast Self‐Assembly of Photonic Crystal Hydrogel for Wearable Strain and Temperature Sensor

“…[12,13] When these periodic distances are within a few hundreds of nanometers, a modulation of the incident white light occurs, resulting in a strengthening in the light with the specific wavelength determined by Bragg's law. [12] Benefiting from structure colors, numerous visual devices, such as actuators, [14] flexible electronics, [15,16] strain sensors, [17][18][19] and other sensors [20,21] have been developed to monitor human motions, [15,16,22] temperature, [23,24] pH, [24] chemical sensing, [25][26][27] and cell monitoring. [28] At present, structure colors are obtained mainly via two schemes, including top-down fabrications such as direct laser writing, [29] nanoimprinting, [30] solvent release, [31] and bottom-up methods such as the self-assembly of nanoparticles (NPs), [32][33][34][35] cellulose nanocrystals, [36][37][38] block copolymers, [24,39] under capillary force [40,41] or external forces.…”

Carbon Dot-Functionalized Colloidal Particles for Patterning and Controllable Layer-Structured Photonic Crystals Construction

“…Here the CDs-functionalized monodisperse P­(S-MMA-AA) hybrid particles are enriched with abundant amino and carboxyl groups inherited from as-grafted CDs, providing a lot of binding sites to couple with each other. The CDs/P­(S-MMA-AA) particles connected by hydrogen bonds between amino and carboxyl groups have a strong binding force, greatly reducing the occurrence of cracks during the assembly process (Figure a). , Obviously, compared with the pristine P­(S-MMA-AA) film, the cracks of the CDs/P­(S-MMA-AA) film are significantly reduced (Figure b,c). By the assistance of G3-PAMAM and functional CDs, large-scale assembly of the crack-free PC film on an A4 glossy paper can be achieved easily via the spiral bar coating method (Figure S5).…”

“…The styrene (St) and potassium persulfate (KPS) were purified before experiments, and the detailed purification process is referred to in our previous work. 20 Methyl methacrylate (MMA), acrylic acid (AA), anhydrous citric acid (≥99.5%), carbamide (≥99.5%), 1-(3-(dimethylamino)propyl)-3-ethylcarbodiimide hydro (EDC, 99.5%), N-hydroxysuccinimide (NHS, 99.5%), Ethylenediamine (EDA) and ferric tetroxide nanoparticles (Fe 3 O 4 , 99.0%) were purchased from Aladdin. Ethanol (≥99.7%) and N,N-dimethylformamide (DMF, ≥99.5%) were purchased from Sinopharm Chemical Reagent Co., Ltd. Deionized water (DI water) with the resistivity greater than 18 MΩ cm −1 was used in the experiments.…”

“…However, it remains challenging to develop large-area colloidal PC films with crack-free morphology and the high-saturation structural color due to the weak interaction between the conventional colloidal particles, e.g., polystyrene (PS), , poly­(methyl methacrylate) (PMMA), and silicon dioxide (SiO 2 ) particles. Many efforts have been made to promote the assembly efficiency of PC films by monodisperse colloidal particles recently. − Coupling the colloidal particles with functional nanomaterials or grafting particular chemical groups have been successfully applied to synthesize high-performance colloidal particles for crack-free PC film-forming reinforcement. − For instance, Shen’s group coated polydopamine on PS nanoparticles (PS@PDA NPs) to fabricate amorphous PCs without apparent defects, which show an enhanced color contrast and low angle dependence due to the covalent bonding of coated colloidal particles . Chen’s group proposed a strategy to construct crack-free PC films by coordination effect among the Ag-loaded dendrimer functionalized polystyrene colloidal particles .…”