Metallic nanoparticle tropism of alkylthiol guest molecules included into α-cyclodextrin host

Barrientos, Lorena; Yutronic, Nicolás; Muñoz, Macarena; Silva, Nataly; Jara, Paul

doi:10.1080/10610270802549709

Cited by 7 publications

(9 citation statements)

References 20 publications

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“…Figure 3(c,d) shows histograms of the DLS-based hydrodynamic size distributions for the bare and Zr(PrO) 4 -treated QDs, respectively. Considering the lengths of the organic ligands like OA ( ∼ 1.5 nm) [35], OLA ( ∼ 2 nm) [36], and DDT ( ∼ 1.5 nm) [37] on the QD surface, the much larger size (10.1 nm) of the bare QDs from the DLS-based analysis compared to the TEM result is acceptable. Meanwhile, the hydrodynamic average size of the Zr(PrO) 4 -treated QDs slightly increased to 11 nm due to the presence of the ultra-thin Zr species above, which was not detectable through TEM measurement.…”

Section: Resultsmentioning

confidence: 99%

Towards the fluorescence retention and colloidal stability of InP quantum dots through surface treatment with zirconium propoxide

Han

Yang

2018

Journal of Information Display

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Through the synthetic development of sophisticated core/shell heterostructures, the fluorescent properties of quantum dots (QDs) have been steadily improved to a level that can ultimately meet the industrial demands, but their reliability is still insufficient, particularly showing low fluorescence stability against degradable conditions. As one solution to this issue, an additional physical barrier typically with an oxide phase has been introduced to protect the QD surface from the environment. In this work, a strategy for improving the stability of QDs involving the passivation of their surfaces with zirconium propoxide (Zr(PrO) 4) is suggested. Multi-shelled green QDs of InP/ZnSeS/ZnS were first synthesized, and then their surfaces were in-situ-treated with Zr(PrO) 4. To confirm the presence of Zr(PrO) 4-derived species on the QD surfaces, chemical analyses of the Zr(PrO) 4-treated QDs were performed through Fourier transform infrared, X-ray photoelectron, and inductively coupled plasma optical emission spectroscopic measurements. A photostability test of two comparative InP/ZnSeS/ZnS QDs-one treated without and one with Zr(PrO) 4-was performed by exposing their dispersions to ultraviolet (UV) irradiation for prolonged periods of time, up to 120 h. It was revealed that Zr(PrO) 4 treatment is highly effective in improving fluorescence retention and colloidal stability.

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Section: Resultsmentioning

confidence: 99%

Towards the fluorescence retention and colloidal stability of InP quantum dots through surface treatment with zirconium propoxide

Han

Yang

2018

Journal of Information Display

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“…These ligand molecules have to be bound to the particle surface by some attractive interaction, such as chemisorption or electrostatic attraction, among others 30,[58][59][60] . Studies performed primarily by our research group have demonstrated that AuNPs can be deposited onto inclusion complexes of cyclodextrins using organic molecules as guest and that possess functional groups such as thiol, carboxylic acid or amine groups [61][62][63][64][65] . Additionally, due to the plasmon effect of AuNPs, it is possible to promote photothermally controlled drug release.…”

Section: Introductionmentioning

confidence: 99%

Gold Nanoparticles Interacting with β-Cyclodextrin–Phenylethylamine Inclusion Complex: A Ternary System for Photothermal Drug Release

Sierpe

Lang

Jara

et al. 2015

ACS Appl. Mater. Interfaces

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We report the synthesis of a 1:1 β-cyclodextrin-phenylethylamine (βCD-PhEA) inclusion complex (IC) and the adhesion of gold nanoparticles (AuNPs) onto microcrystals of this complex, which forms a ternary system. The formation of the IC was confirmed by powder X-ray diffraction and NMR analyses ((1)H and ROESY). The stability constant of the IC (760 M(-1)) was determined using the phase solubility method. The adhesion of AuNPs was obtained using the magnetron sputtering technique, and the presence of AuNPs was confirmed using UV-vis spectroscopy (surface plasmon resonance effect), which showed an absorbance at 533 nm. The powder X-ray diffractograms of βCD-PhEA were similar to those of the crystals decorated with AuNPs. A comparison of the one- and two-dimensional NMR spectra of the IC with and without AuNPs suggests partial displacement of the guest to the outside of the βCD due to attraction toward AuNPs, a characteristic tropism effect. The size, morphology, and distribution of the AuNPs were analyzed using TEM and SEM. The average size of the AuNPs was 14 nm. Changes in the IR and Raman spectra were attributed to the formation of the complex and to the specific interactions of this group with the AuNPs. Laser irradiation assays show that the ternary system βCD-PhEA-AuNPs in solution enables the release of the guest.

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“…The use of functionalized surface of supramolecular crystals that have the ability to direct their functional groups to the proximity of a nanostructure [12] allows attachment of a single surface coat of AuNRs facilitating studies of their individual optical properties in solid state [20]. AuNRs have plasmon resonant absorption and scattering in near infrared region, making them attractive probes for in vitro and in vivo imaging [21].…”

Section: Discussionmentioning

confidence: 99%

“…This is probably due to the greatest interaction between the IC and AuNRs, (produced by the chemisorption of AuNRs and -SH groups of the pivot guest molecules [12]) compared with the van der Waals forces between CTAB molecules surrounding AuNRs. After the process of washing, the crystals remain in the surface only AuNRs that are interacting with -SH groups of preferential plane of the crystal.…”

Section: Sem and Eds Analysismentioning

confidence: 99%

“…In this paper, we reported for the first time the selective nanodecoration of a-CD/OT IC crystal plane with AuNRs by the action of dynamic functionalized surface, where the -SH groups of the guest molecule, that protruded from that particular plane of the crystal, act as a pivot [12], partially displaced the CTAB molecules of AuNRs. This produces a single coating of AuNRs onto crystal surface that allows the study of individual optical properties, which are of the great important in nanochemistry and interface phenomenon.…”

Section: Introductionmentioning

confidence: 97%

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Selective nanodecoration of modified cyclodextrin crystals with gold nanorods

Herrera

Adura

Yutronic

et al. 2013

Journal of Colloid and Interface Science

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Metallic nanoparticle tropism of alkylthiol guest molecules included into α-cyclodextrin host

Cited by 7 publications

References 20 publications

Towards the fluorescence retention and colloidal stability of InP quantum dots through surface treatment with zirconium propoxide

Towards the fluorescence retention and colloidal stability of InP quantum dots through surface treatment with zirconium propoxide

Gold Nanoparticles Interacting with β-Cyclodextrin–Phenylethylamine Inclusion Complex: A Ternary System for Photothermal Drug Release

Selective nanodecoration of modified cyclodextrin crystals with gold nanorods

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