Photoluminescent and pH-responsive supramolecular structures from co-assembly of carbon quantum dots and zwitterionic surfactant micelles

Sun, Xiaofeng; Chen, Mengjun; Zhang, Yiqiang; Yin, Yanji; Zhang, Linwen; Li, Hongguang; Hao, Jingcheng

doi:10.1039/c8tb00630j

Cited by 28 publications

(34 citation statements)

References 51 publications

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“…However, there are limited reports for the fabrication of inherently luminescent stable hybrid vesicles. Earlier, Sun et al investigated the self-assembly mechanism of oppositely charged carbon quantum dots (CQDs)–surfactants mixture and showed the formation of supramolecular fluorescent vesicles. , …”

Section: Introductionmentioning

confidence: 99%

“…Earlier, Sun et al investigated the self-assembly mechanism of oppositely charged carbon quantum dots (CQDs)−surfactants mixture and showed the formation of supramolecular fluorescent vesicles. 39,40 In the present study, we have investigated the interaction of MSA-capped CdTe QDs with surfactant assemblies and explored the self-assembly mechanism by using various spectroscopic and microscopic techniques (Scheme 1). The aim of the present study is to illustrate the role of electrostatic interactions between oppositely charged QDs and surfactants in the association and subsequent self-assembly process.…”

Section: ■ Introductionmentioning

confidence: 99%

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Surfactant-Induced Self-Assembly of CdTe Quantum Dots into Multicolor Luminescent Hybrid Vesicles

Vaishnav

Mukherjee

2019

Langmuir

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Here, we report the interaction of mercaptosuccinic acid (MSA)-capped CdTe quantum dots (QDs) with hexadecyltrimethylammonium bromide (CTAB) surfactant and subsequent formation of self-assembled multicolor luminescent vesicles in aqueous medium. A continuous phase sequence from clear (C1) to turbid (T1), precipitate (P), turbid (T2), and clear (C2) has been observed for QD solution upon increasing the concentration of positively charged CTAB, indicating dynamic equilibrium between various self-assembled supramolecular structures. In contrast, no such changes have been observed in the presence of negatively charged sodium dodecyl sulfate and neutral Triton X-100 surfactants, indicating specific electrostatic interactions behind the observed phase separation behavior. Epi-fluorescence imaging in the C1 and C2 regions reveals the presence of surfactant-induced aggregates of QD. The morphologies and photoluminescence properties of self-assembled supramolecular structures in the T1 and T2 region have been explored by using scanning electron microscopy (SEM), atomic force microscopy (AFM), and confocal laser scanning microscopy (CLSM). SEM and AFM images reveal distinct spherical vesicles in the T1 and T2 regions of the binary mixture. Moreover, CLSM results show that these spherical vesicles are inherently luminescent due to the presence of self-assembled QDs. Fabrication of multicolor luminescent vesicles has been demonstrated by tuning the size of CdTe QD. Using CLSM, we have further demonstrated efficient encapsulation of Rhodamine 6G dye into these self-assembled vesicles without any structural disruption. While these luminescent vesicles are quite stable in neutral and basic pH (pH = 6.5–11), they are unstable in acidic pH (pH = 4.5–5.5). Moreover, it has been observed that this pH-responsive structural change is totally reversible. The present findings of self-assembled luminescent vesicles from QD-CTAB binary mixture may open up new opportunities in various applications such as bioimaging, drug delivery, and sensing.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Surfactant-Induced Self-Assembly of CdTe Quantum Dots into Multicolor Luminescent Hybrid Vesicles

Vaishnav

Mukherjee

2019

Langmuir

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“…In addition to the above-mentioned three applications, the enzyme-regulated healable polymer hydrogels are also potentially useful in many other fields when combining with functional guest materials (Figure ). On one hand, nanomaterials such as quantum dots, metal nanoparticles, , carbon nanotubes, and graphene show excellent optical, electronic, magnetic, thermal, mechanical, and other properties. These nanomaterials also have good compatibility with polymers and can be introduced into polymer hydrogels to improve their fluorescence performance, mechanical toughness, and electrical conductivity.…”

Section: Applications Of Enzyme-regulated Healable Polymeric Hydrogelsmentioning

confidence: 99%

Enzyme-Regulated Healable Polymeric Hydrogels

Zhong

et al. 2020

ACS Cent. Sci.

Self Cite

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The enzyme-regulated healable polymeric hydrogels are a kind of emerging soft material capable of repairing the structural defects and recovering the hydrogel properties, wherein their fabrication, self-healing, or degradation is mediated by enzymatic reactions. Despite achievements that have been made in controllable cross-linking and de-cross-linking of hydrogels by utilizing enzyme-catalyzed reactions in the past few years, this substrate-specific strategy for regulating healable polymeric hydrogels remains in its infancy, because both the intelligence and practicality of current man-made enzyme-regulated healable materials are far below the levels of living organisms. A systematic summary of current achievements and a reasonable prospect at this point can play positive roles for the future development in this field. This Outlook focuses on the emerging and rapidly developing research area of bioinspired enzyme-regulated self-healing polymeric hydrogel systems. The enzymatic fabrication and degradation of healable polymeric hydrogels, as well as the enzymatically regulated self-healing of polymeric hydrogels, are reviewed. The functions and applications of the enzyme-regulated healable polymeric hydrogels are discussed.

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“…The fluorescence of CDs is usually found to be pH-dependent, which is attributed to the reversible protonation and deprotonation of functional groups on the surface of CDs [ 15 , 16 , 17 , 18 , 19 ] and the aggregation of CDs [ 17 , 20 , 21 ]. Among these, N-doping also plays a very important role.…”

Section: Introductionmentioning

confidence: 99%

pH-Sensitive Silver-Containing Carbon Dots Based on Folic Acid

Wang

2022

Materials

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Herein, Ag-containing carbon dots (Ag-CDs) was synthesized based on folic acid. In a neutral solution, its fluorescence emission owns a structure fixing fluorescent species with the emission maximum at 400 nm and an excitation-wavelength dependent fluorescent species, respectively. By comparing fluorescent emission and excitation spectra, the electronic absorption origins of these fluorescent species were assigned. With the assistance of UV–Vis absorption and XPS, the pH-regulating fluorescence mechanism of Ag-CDs was studied and proposed. A particularly strong fluorescence emitter was observed at pH ~12 with a mixing coordination structure as Ag(CDs-NH2)OH. The as-prepared Ag-CDs might be developed into a fluorescent sensor, especially at extremely basic conditions.

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Photoluminescent and pH-responsive supramolecular structures from co-assembly of carbon quantum dots and zwitterionic surfactant micelles

Abstract: Mixing negatively charged carbon quantum dots with a zwitterionic surfactant in water produces a variety of supramolecular structures, which are photoluminescent and show a reversible response to pH.

Cited by 28 publications

References 51 publications

Surfactant-Induced Self-Assembly of CdTe Quantum Dots into Multicolor Luminescent Hybrid Vesicles

Surfactant-Induced Self-Assembly of CdTe Quantum Dots into Multicolor Luminescent Hybrid Vesicles

Enzyme-Regulated Healable Polymeric Hydrogels

pH-Sensitive Silver-Containing Carbon Dots Based on Folic Acid

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