A self-assembled CdSe QD–organogel hybrid: photophysical and thermoresponsive properties

Chatterjee, Sayantan; Kuppan, Balamurugan; Maitra, Uday

doi:10.1039/c7dt04454b

Cited by 14 publications

(13 citation statements)

References 58 publications

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“…However, the capping agents attached at the surface of the QRs could interact favourably with the gelator molecules through their long lipophilic alkyl chains as this renders the QRs soluble in a non‐polar aromatic solvent (DCB). Furthermore, presence of deoxycholic acid along with TOPO on the surface of the QRs is evident in the FT‐IR spectrum of the QRs (Figure S6) and this yields more support to the co‐assembly due to the structural similarity between the capping ligand and the gelator …”

Section: Resultsmentioning

confidence: 94%

Wire‐Like Tip‐To‐Tip Linked Assemblies of CdSe‐CdS Quantum Rods Promoted on Supramolecular Nanofibers of Hybrid Organo‐ and Hydrogels

et al. 2019

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A variety of core-shell CdSe-CdS nanorods or quantum rods (QRs), both sphere (CdSe) in rod (CdS) and rod (CdSe) in rod (CdS) have been synthesized in a seededgrowth approach using a very efficient and highly thermally stable steroidal cadmium precursor replacing the more common CdO: cadmium deoxycholate. The core-shell QRs display high photoluminescence quantum yields (40-75%) and high molar absorption co-efficient (ϵ = 10 6 M À 1 cm À 1 ). Sphere-in-rods QRs can be co-assembled with the organogelator diethylaminolithocholyl iodide in 1,2-dichlorobenzene and with the hydrogelator calcium cholate in water to form hybrid gels. These organic-inorganic hybrid soft materials are translucent and brightly red-luminescent. The nanofibers composing the gel network act as a scaffold to support the dispersed QRs and impede their self-aggregation. Furthermore, formation of original wire-like assemblies of the nanorods is promoted in these gels, in particular in the hydrogel. This orientation occurs by a QR tip-to-tip interaction and is proposed to be driven by the amphiphilic behaviour of the QRs: laterally capped by negatively charged TGA (thioglycolic acid) ligands and un-capped on the tips due to TGA unbinding. The combination of nanofiberforming hydrogelators and elongated quantum rods is promising in the perspective to form hybrid nanostructures with anisotropic optic or electronic properties.

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Section: Resultsmentioning

confidence: 94%

Wire‐Like Tip‐To‐Tip Linked Assemblies of CdSe‐CdS Quantum Rods Promoted on Supramolecular Nanofibers of Hybrid Organo‐ and Hydrogels

et al. 2019

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“…[ 71 ] In another investigation, a lithocholic acid‐based organogelator facilitated the fabrication of CdSe QD organogel hybrid, which exhibited interesting photophysical and thermoresponsive properties. [ 72 ] Sodium deoxycholate facilitated the synthesis of photoluminescent chiral hydrogels [37a] . Gel formation involved interactions of sodium deoxycholate and glutathione [37a] .…”

Section: Fabrication Of Composite Gelsmentioning

confidence: 99%

Multifunctional Properties of Commercial Bile Salts for Advanced Materials Engineering

et al. 2021

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Applications of bile acids (BAs) and bile salts (BSs) in the nanotechnology of functional materials are described. The exceptionally strong solubilization and dispersion power of BAs/BSs is a key factor for the solubilization of dyes, drugs, and polymers for electronic, optical, and biomedical devices, fabrication of composites, based on carbon nanotubes, graphene, diamonds, quantum dots, and polymers for applications in energy storage devices, coatings for corrosion protection of metals, sensors and electronic devices. BAs/BSs have attracted attention for synthesis, design, and surface modification of advanced materials. BAs/BSs are used as reducing, capping, chelating and dispersing agents for the synthesis of nanoparticles of metals and alloys, and low temperature synthesis of stoichiometric nanostructured complex oxides. BAs/BSs exhibit unique selfassembly properties, which are successfully used for the template synthesis of functional nanoparticles of controlled shapes. Particularly important are applications of BAs/BSs in the fabrication of dye sensitized solar cells with enhanced efficiency. Electrochemical strategies are discovered for the deposition of BA films and composites. Of particular interest are the unique gel-forming properties of BAs/BSs, which provide a basis for the synthesis of nanoparticles of controlled size and fabrication of novel materials with advanced functionality.

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“…The last few decades have witnessed a continuously growing interest in the fabrication of supramolecular gels, a smart functional material, encompassing fascinating physicochemical aspects. − Gels are principally self-assembled, viscoelastic, soft materials having nanoscale morphologies. From recent past, researchers are genuinely involved in their fabrication and advancement owing to their promising and wide array of applications in different branches of science and technology including catalysis, sensing, environmental pollution abatement, sorption, optoelectronics, magnetism, supercapacitors, drug delivery, cell imaging, O 2 binding and activation, and so on. − The gels are commonly having cross-linked interwoven fibrillar nanodimensional architectures, which favors the entrapment of large volume of solvent molecules, within the available annulled space of their network morphology. A couple of different coordinative and non-covalent interactions, including hydrogen bondings, hydrophobic interactions, van der Waals forces, π–π/CH−π interactions, electrostatic effects, and so forth, play the responsible role in bringing out the stable gelation.…”

Section: Introductionmentioning

confidence: 99%

Cu(II)-Based Nanofibrous Metallogel for Phenoxazinone Synthase-like Activity

Sarkar

Maji

Dutta

et al. 2021

ACS Appl. Nano Mater.

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Metallogel formation by an individual ligand is well known, but simultaneous need of two ligands in selective metallogelation is relatively less common. In our present study, we have shown that disodium succinate and hexamethylenetetramine, when allowed to react simultaneously with CuCl 2 in an aqueous medium, instantaneously form a greenish metallogel. The gelation is not attainable in the absence of any of the two ligands, which ascertains the cooperativity of the ligands to successfully achieve the metallogelation. Different microanalytical studies [Fourier transform infrared (FTIR), powder X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, rheology, and so on] have been performed for complete characterizations of the gel sample. The gel shows a nanodimensional entangled network morphology. Metal−ligand coordination in association with solventmediated hydrogen bonding interactions becomes a part-and-parcel in making the nanoscale fibrillar network of the metallogel. Different related ligands and metal ions were also reviewed in lieu of the above two ligands and the Cu(II) ion, but none of the alternatives was able to result in the gel formation. Thus, both the ligands were highly specific for the said metallogelation with Cu(II) only. The effect of counter anions of the Cu(II) salt was also studied. The gel also exhibits its stimuli-responsive nature toward different interfering chemical parameters such as pH, selective anions, selective complexing agents, and so forth. Finally, the robust Cu(II) metallogel was deliberately exploited as a heterogeneous catalyst for successful oxidative conversion of 2-aminophenol (OAPH) to phenoxazinone hiring atmospheric oxygen and thereby conferring its role as a biomimetic nanozyme catalyst. The catalytic conversion has been followed spectrophotometrically. The detailed kinetics for the reaction was performed with varied reaction parameters. The Michaelis−Menten model was applied to analyze the results. Based on the experimental results (e.g., FTIR, XRD, thermogravimetric analysis, and electrospray ionization−mass spectrometry), a mechanistic approach has also been anticipated to establish the catalytic process. Finally, recyclability of the catalyst was also verified. This nanozymatic phenoxazinone synthase-like activity of a nanodimensional metallogel is hitherto unknown and thus suggests its enzyme mimicking feature.

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A self-assembled CdSe QD–organogel hybrid: photophysical and thermoresponsive properties

Cited by 14 publications

References 58 publications

Wire‐Like Tip‐To‐Tip Linked Assemblies of CdSe‐CdS Quantum Rods Promoted on Supramolecular Nanofibers of Hybrid Organo‐ and Hydrogels

Wire‐Like Tip‐To‐Tip Linked Assemblies of CdSe‐CdS Quantum Rods Promoted on Supramolecular Nanofibers of Hybrid Organo‐ and Hydrogels

Multifunctional Properties of Commercial Bile Salts for Advanced Materials Engineering

Cu(II)-Based Nanofibrous Metallogel for Phenoxazinone Synthase-like Activity

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