A dual-mode fluorometric/colorimetric sensor for Cu<sup>2+</sup> detection based on hybridized carbon dots and gold–silver core–shell nanoparticles

Chen, Yuqing; Lian, Yawen; Huang, Mengna; Wei, Lin; Xiao, Lehui

doi:10.1039/c9an00850k

Cited by 35 publications

(17 citation statements)

References 41 publications

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“…Gold–silver (Au@Ag) core–shell nanostructures play a pivotal role in nanosynthesis and applications. Due to their stronger surface plasma response, wider absorption and scattering in the UV–vis–NIR region, and unique optical properties, the Au@Ag core–shell nanostructures are widely used in biosensors − and abiosensors, − biological imaging, − photothermal therapy, , and catalysis. , These applications depend primarily on the distinctive properties of the core–shell nanostructures, which are derived from their unique morphology, size, and atomic lattices. Therefore, it is highly important to regulate core–shell structures precisely at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical Molecular Decoration of Gold Nanorods for Engineering of Shape-Controlled AuNR@Ag Core–Shell Nanostructures

et al. 2019

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Gold−silver (Au@Ag) core−shell nanostructures have a stronger surface plasma response, wider absorption and scattering in the UV−vis−NIR region, and distinctive optical properties, which are widely explored in biosensors, information processing, photothermal therapy, and catalysis. Core−shell nanostructures are usually formed by the deposition of the second metal atoms onto the first core metal particles via the chemical wet method. The conventional approaches for the manipulation of the shape usually were done by homogeneous growth or etching of isotropic nanoparticles. Through in situ modification of the first metal core at the different locations, the different growth model of the second metal can be regulated to control the shapes of core−shell structures. Herein, we modified the gold nanorods (AuNRs) asymmetrically at the end and side parts using thiolated molecules to regulate the morphology of gold nanorod@silver (AuNR@Ag) core−shell nanoparticles. Interestingly, the obvious eccentric nanostructures of AuNR@Ag core−shell nanoparticles were obtained with the increase of the molecular weight of macromolecules modified at the end of AuNRs. Therefore the growth mode was adjusted from Frank−van der Merwe mode to Stranski−Krastanow mode. By changing the length of the hydrocarbon chain and functional groups of the small mercaptan molecules at the side of AuNRs, the silver shell exhibits selective growth at the side of the AuNRs, resulting in heterogeneous core−shell nanoparticles and various shapes of the AuNR@Ag core−shell. Our method opens up a new avenue toward preparing core−shell nanostructures with controlled shapes, and the obtained structures are promising in various applications.

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Section: Introductionmentioning

confidence: 99%

Asymmetrical Molecular Decoration of Gold Nanorods for Engineering of Shape-Controlled AuNR@Ag Core–Shell Nanostructures

et al. 2019

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“…Besides, the QDs possessed good uorescence stability and long uorescence lifetime. The comparison of different QDs-based assays for the detection of Cu 2+ are listed in Table S3 [40][41][42][43][44] (see ESI †). By comparison, these uorescent probes used to detect Cu 2+ were synthesized in a variety of ways.…”

Section: Fluorescence Detection Of Cu 2+mentioning

confidence: 99%

Facile one-step synthesis of quaternary AgInZnS quantum dots and their applications for causing bioeffects and detecting Cu²⁺

Han

Hao

et al. 2020

RSC Adv.

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“…However, they require more advanced instrumentation, i.e., light source and revelator, while fluorescent materials are often based on complex synthesis steps [ 17 , 18 ]. On the other hand, variations of absorbance can enable simple naked-eye visual inspection through visual color change along with instrumental quantitative colorimetric determination of the presence of a specific analyte [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Sensing Properties of N and S Co-Doped Carbon Dots for Colorimetric Detection of Copper and Cobalt in Water

Bisauriya

Antonaroli

Ardini

et al. 2022

Sensors

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In this study, nitrogen and sulfur co-doped carbon dots (NS-CDs) were investigated for the detection of heavy metals in water through absorption-based colorimetric response. NS-CDs were synthesized by a simple one-pot hydrothermal method and characterized by TEM, STEM-coupled with energy dispersive X-ray analysis, NMR, and IR spectroscopy. Addition of Cu(II) ions to NS-CD aqueous solutions gave origin to a distinct absorption band at 660 nm which was attributed to the formation of cuprammonium complexes through coordination with amino functional groups of NS-CDs. Absorbance increased linearly with Cu(II) concentration in the range 1–100 µM and enabled a limit of detection of 200 nM. No response was observed with the other tested metals, including Fe(III) which, however, appreciably decreased sensitivity to copper. Increase of pH of the NS-CD solution up to 9.5 greatly reduced this interference effect and enhanced the response to Cu(II), thus confirming the different nature of the two interactions. In addition, a concurrent response to Co(II) appeared in a different spectral region, thus suggesting the possibility of dual-species multiple sensitivity. The present method neither requires any other reagents nor any previous assay treatment and thus can be a promising candidate for low-cost monitoring of copper onsite and by unskilled personnel.

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A dual-mode fluorometric/colorimetric sensor for Cu²⁺ detection based on hybridized carbon dots and gold–silver core–shell nanoparticles

Abstract: A fluorometric and colorimetric dual mode sensing platform based on hybridized carbon dots (Cdots) and gold–silver core–shell nanoparticles (Au@Ag NPs) has been established for the sensitive detection of trace Cu2+ ions in aqueous solution.

Cited by 35 publications

References 41 publications

Asymmetrical Molecular Decoration of Gold Nanorods for Engineering of Shape-Controlled AuNR@Ag Core–Shell Nanostructures

Asymmetrical Molecular Decoration of Gold Nanorods for Engineering of Shape-Controlled AuNR@Ag Core–Shell Nanostructures

Facile one-step synthesis of quaternary AgInZnS quantum dots and their applications for causing bioeffects and detecting Cu²⁺

Tuning the Sensing Properties of N and S Co-Doped Carbon Dots for Colorimetric Detection of Copper and Cobalt in Water

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A dual-mode fluorometric/colorimetric sensor for Cu2+ detection based on hybridized carbon dots and gold–silver core–shell nanoparticles

Abstract: A fluorometric and colorimetric dual mode sensing platform based on hybridized carbon dots (Cdots) and gold–silver core–shell nanoparticles (Au@Ag NPs) has been established for the sensitive detection of trace Cu2+ ions in aqueous solution.

Cited by 35 publications

References 41 publications

Asymmetrical Molecular Decoration of Gold Nanorods for Engineering of Shape-Controlled AuNR@Ag Core–Shell Nanostructures

Asymmetrical Molecular Decoration of Gold Nanorods for Engineering of Shape-Controlled AuNR@Ag Core–Shell Nanostructures

Facile one-step synthesis of quaternary AgInZnS quantum dots and their applications for causing bioeffects and detecting Cu2+

Tuning the Sensing Properties of N and S Co-Doped Carbon Dots for Colorimetric Detection of Copper and Cobalt in Water

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Resources

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A dual-mode fluorometric/colorimetric sensor for Cu²⁺ detection based on hybridized carbon dots and gold–silver core–shell nanoparticles

Facile one-step synthesis of quaternary AgInZnS quantum dots and their applications for causing bioeffects and detecting Cu²⁺