Phenol Formaldehyde Resin Nanoparticles Loaded with CdTe Quantum Dots: A Fluorescence Resonance Energy Transfer Probe for Optical Visual Detection of Copper(II) Ions

Yang, Ping; Zhao, Yang; Lu, Yang; Xu, Qizhi; Xu, Xue-Wei; Dong, Liang; Yu, Shu‐Hong

doi:10.1021/nn103352b

Cited by 131 publications

(77 citation statements)

References 57 publications

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“…[14][15][16] The oxidation state of Cu in ZnS shells has been discussed for a long time and it has been established that Cu adopts the 1 + oxidation state in ZnS lattices, which was confirmed by our XPS measurements.…”

supporting

confidence: 84%

“…[13] Indeed, QDs have demonstrated high sensitivity towards Cu ions, where the presence of Cu dramatically quenches the QD core photoluminescence. [14][15][16] The oxidation state of Cu in ZnS shells has been discussed for a long time and it has been established that Cu adopts the 1 + oxidation state in ZnS lattices, which was confirmed by our XPS measurements. [17] Herein we show that doping small amounts of Cu into the ZnS QD shell partially quenches the QD core luminescence, but makes QDs photoactivated vectors for the release of catalytically active Cu + ions.…”

supporting

confidence: 84%

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Copper‐Doped CdSe/ZnS Quantum Dots: Controllable Photoactivated Copper(I) Cation Storage and Release Vectors for Catalysis

et al. 2013

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The first photoactivated doped quantum dot vector for metal-ion release has been developed. A facile method for doping copper(I) cations within ZnS quantum dot shells was achieved through the use of metal-dithiocarbamates, with Cu + ions elucidated by X-ray photoelectron spectroscopy. Photoexcitation of the quantum dots has been shown to release Cu + ions, which was employed as an effective catalyst for the Huisgen [3+2] cycloaddition reaction. The relationship between the extent of doping, catalytic activity, and the fluorescence quenching was also explored.The use of quantum dots (QDs) for optical devices, [1][2][3] bioimaging agents, [4,5] and energy materials [6] has been the subject of intensive research, but their photoactivated properties have been largely overlooked as vectors for the controlled release of catalytic metals.[7] Herein we demonstrate that Cudoped CdSe/ZnS QDs act as vectors for the photoinduced release of Cu + ions for catalysis. The overgrowth of a shell composed of a semiconducting material such as ZnS with a larger band-gap (type-I core-shell system) than the QD core passivates the QD surface and leads to much improved photostability and decreased cytotoxicity.[8] The thickness of the shell, as well as the presence of dopants has been shown to dictate QD luminescence properties, [9] which we herein link to catalytic potential.Past studies on Cu doping have focused on doping the QD core, resulting in emission-tunable nanoparticles with enhanced luminescence properties and long-lived photoinduced magnetization.[10] When doped into ZnS QD cores, Cu has been shown in the 2 + oxidation state and can act as a source of optically active holes.[11] Crooker and co-workers have shown that photoexcitation allows the tuning of the paramagnetic Cu 2+ species in the QD core.[12] Doping Cu into the QD shells has been largely uninvestigated. This is possibly because of the detrimental effect Cu ions have on the QD luminescence.[13] Indeed, QDs have demonstrated high sensitivity towards Cu ions, where the presence of Cu dramatically quenches the QD core photoluminescence. [14][15][16] The oxidation state of Cu in ZnS shells has been discussed for a long time and it has been established that Cu adopts the 1 + oxidation state in ZnS lattices, which was confirmed by our XPS measurements.[17]Herein we show that doping small amounts of Cu into the ZnS QD shell partially quenches the QD core luminescence, but makes QDs photoactivated vectors for the release of catalytically active Cu + ions. We hypothesize that S in the ZnS/CuS shell is slowly photooxidized to SO x yÀ on irradiation, which causes Cu + to be released into solution. To evaluate this hypothesis, reactions which are selectively catalyzed by Cu + species such as the Huisgen [3+2] cycloaddition developed by Sharpless [18] and Meldal [19] and co-workers have been employed. To the best of our knowledge, this is the first example of CdSe/ZnS-CuS QDs as Cu + vectors for heterogeneous catalysis. Typically, QDs are shelled either by precursor i...

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supporting

confidence: 84%

supporting

confidence: 84%

Copper‐Doped CdSe/ZnS Quantum Dots: Controllable Photoactivated Copper(I) Cation Storage and Release Vectors for Catalysis

et al. 2013

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“…Under the optimized conditions, the Cu 2+ -specific probe exhibits high sensitivity towards Cu 2+ but also high selectivity over other possible interference ions. The method is also highlighted by its simplicity and rapidity as compared to many other nanoparticles-based colorimetric methods [32][33][34][35][36][37][38][39][40][41]. Compared with our former research [28], the present work is more timesaving and sensitive to naked-eyes.…”

Section: Discussionmentioning

confidence: 78%

Colorimetric sensing of copper(II) based on catalytic etching of gold nanoparticles

Liu

Chen

Wang

et al. 2013

Talanta

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“…It is a suitable choice of amino groups as stabilizers for metallic nanoparticles due to its complexing interaction between the nitrogen atom in amino groups with metallic atoms [39,40]. Consequently, the gold nanocolloids were uniformly deposited onto the surface of P(DVB-co-GMA)-NH 2 microspheres with hydrophilic surface (GMA fraction of 0.60 in the comonomer feed as an example) by the in situ reduction of HAuCl 4 with NaBH 4 as reductant via the stabilization of the amino groups.…”

Section: P(dvb-co-gma)-nh 2 Stabilized Gold Nanocolloidsmentioning

confidence: 99%

Preparation of polymer microspheres with reactive epoxy group and amino groups as stabilizers for gold nanocolloids with recoverable catalysis

et al. 2014

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Narrow disperse poly(divinylbenzene-co-glycidyl methacrylate) (P(DVB-co-GMA)) microspheres with reactive epoxy group were prepared by distillation precipitation copolymerization of divinylbenzene (DVB) and glycidyl methacrylate (GMA) with benzoyl peroxide (BPO) as initiator in neat acetonitrile. The epoxy group was modified with ethylenediamine (EDA) for transferring to amino group, which was used as a stabilizer for the gold metallic nanocolloids during the in situ reduction of gold chloride trihydrate (HAuCl 4 ) with sodium borohydride (NaBH 4 ) as a reductant. The catalytic properties of the microspherestabilized gold nanocolloids (P(DVB-co-GMA)-NH 2 @Au) were investigated by the reduction of aqueous 4-nitrophenol (4-NP) to 4-aminophenol (4-AnP) with NaBH 4 as reductant. The resultant microspheres were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectra (FT-IR), elemental analysis (EA), Zeta potential, X-ray photoelectron spectroscopy (XPS), inductively coupled plasma (ICP) mission spectrum, and ultraviolet-visible spectroscopy.

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Phenol Formaldehyde Resin Nanoparticles Loaded with CdTe Quantum Dots: A Fluorescence Resonance Energy Transfer Probe for Optical Visual Detection of Copper(II) Ions

Cited by 131 publications

References 57 publications

Copper‐Doped CdSe/ZnS Quantum Dots: Controllable Photoactivated Copper(I) Cation Storage and Release Vectors for Catalysis

Copper‐Doped CdSe/ZnS Quantum Dots: Controllable Photoactivated Copper(I) Cation Storage and Release Vectors for Catalysis

Colorimetric sensing of copper(II) based on catalytic etching of gold nanoparticles

Preparation of polymer microspheres with reactive epoxy group and amino groups as stabilizers for gold nanocolloids with recoverable catalysis

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