Multispectral and Circular Polarization‐Sensitive Carbon Dot‐Polydiacetylene Capacitive Photodetector

Abstract

Multispectral photodetectors (MSPs) and circularly polarized light (CPL) sensors are important in opto‐electronics, photonics, and imaging. A capacitive photodetector consisting of an interdigitated electrode coated with carbon dot/anthraquinone‐polydiacetylene is constructed. Photoexcitation of the carbon dots induces transient electron transfer to the anthraquinone moieties, and concomitant change in the film dielectric constant and recorded capacitance. This unique photodetection mechanism furnishes wavelength selectivity that is solely determined by the absorbance of the carbon dots incorporated in the anthraquinone‐polydiacetylene matrix. Accordingly, employing an array of polymerized‐anthraquinone photodetector films comprising carbon dots (C‐dots) exhibiting different excitation wavelengths yielded optical “capacitive fingerprints” in a broad spectral range (350–650 nm). Furthermore, circular light polarization selectivity is achieved through chiral polymerization of the polydiacetylene framework. The carbon dot/anthraquinone‐polydiacetylene capacitive photodetector features rapid photo‐response, high fidelity, and recyclability as the redox reactions of anthraquinone are fully reversible. The carbon dot/anthraquinone‐polydiacetylene platform is inexpensive, easy to fabricate, and consists of environmentally friendly materials.

Light-Induced Self-Assembled Polydiacetylene/Carbon Dot Functional “Honeycomb”

“…21,34 Similarly, bis-ADA molecules were shown to exhibit propensity for aligned structures, mediated by π−π interactions between the anthraquinone cores and hydrogen-bonds between the pendant side chains etc. 42 Figure 5 also underscores the key roles of the C-dots, which both display close proximity allowing interactions with the anthraquinone cores of bis-ADA, while parallel linking with the MCDA-EDEA moieties through hydrogen bonding to their amine termini. Figure 5 also illustrates the charge transfer between the C-dots and bis-ADA (i.e., EPR analysis in Figure 4), which is a key driving force for the honeycomb assembly.…”

“…Bis-ADA adopts lamellar sheets upon self-assembly in organic solvents like toluene. 42 Carbon dots synthesized from octadecylamine as the carbon source were also employed (Figure 1A). The presence of −NH 2 and −COOH residues on the C-dots' surface [confirmed by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR), Figure S1] promote selfassembly via noncovalent interactions with the pendant side chains and hydrophobic cores of MCDA-EDEA and bis-ADA.…”

Anthraquinone‐Functionalized Polydiacetylene Supercapacitors

“…Chloroform‐dissolved bis‐ADA monomers were drop‐casted on a graphite sheet and photopolymerized (254 nm, 60 s), yielding the conjugated polydiacetylene network. [ 11 ] The representative scanning electron microscopy (SEM) image in Figure 1B shows the assembly of bis‐anthraquinone‐polydiacetylene (bis‐APDA) microflakes furnishing porosity and high surface area that are important for the electrochemical performance.…”

“…The synthesis of polyaniline was performed following the chemical route published earlier. [11] Synthesis of PANI: The synthesis of PANI was performed following the chemical route published earlier with a little modification in the process. [14b] Briefly, 3.1 mL of aniline was dissolved in aqueous solution of 20 mL of concentrated HCl containing 190 mL of Deionised (DI) water.…”

Circularly Polarized Light Responsive Materials: Design Strategies and Applications

“…A light‐polymerizable anthraquinone‐diacetylene compound was allowed to blend with carbon dots. [ 73 ] The hybrid films with diacetylene segments were polymerized by CPL illumination, which successfully transferred chirality via light–matter interaction. By embedding carbon dots with tunable absorbance bands, broad spectral range (350–650 nm) with multiple wavelengths can be achieved, which features rapid photo‐response, high fidelity, and recyclability.…”