Gold nanoparticles for the colorimetric and fluorescent detection of ions and small organic molecules

Liu, Dingbin; Wang, Zhuo; Jiang, Xingyu

doi:10.1039/c0nr00887g

Cited by 394 publications

(253 citation statements)

References 141 publications

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“…12 In this study, we studied the effects of salts (including NaCl, MgCl 2 , and CaCl 2 ) concentrations on the stability of Au@PEG-F NPs. The concentration of these salts ranged in 0.5−500 mM.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Sensitive Colorimetric Visualization of Perfluorinated Compounds Using Poly(ethylene glycol) and Perfluorinated Thiols Modified Gold Nanoparticles

et al. 2014

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In this work, we have developed a novel sensing strategy employing mixed poly(ethylene glycol)-terminated (PEG-thiols) and perfluoroalkyl-terminated (F-thiols) alkanethiols modified gold nanoparticles (Au@PEG-F NPs) as a probe to detect perfluorinated compounds (PFCs) from water samples. PEG-thiols with high density and long carbon chains make the Au NPs probe well-dispersed in solution and stable even in high concentration of salt solution; F-thiols provide specific fluorous−fluorous interactions to PFCs, which results in adsorption of PFCs on Au@PEG-F NPs. The adsorbed PFCs cause the aggregation of Au@PEG-F NPs probes and thus induce the insolubility of probes and precipitation directly from reaction solution due to the superhydrophobicity of perfluorocarbon monolayers, leading to color and absorbance response of the assay to PFCs. The preparation of the Au@PEG-F NPs probe is very simple, and the colorimetric assay based on this mechanism for the detection of PFCs is selective and convenient. Combined with UV−vis spectrophotometry, the assay demonstrates good sensitivities to PFCs with wide linear range. In the designed concentration range, the response of the colorimetric assay to longchain PFCs (perfluoroalkyl chain ≥7) is discerned even as the concentration of these PFCs is as low as 10 μg L −1 . This low-cost and sensitive assay shows great potential to measure total PFCs in water samples. To the best of our knowledge, this is the first application of the specific fluorous−fluorous interactions and Au NPs based probes for colorimetric recognition for PFCs.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Sensitive Colorimetric Visualization of Perfluorinated Compounds Using Poly(ethylene glycol) and Perfluorinated Thiols Modified Gold Nanoparticles

et al. 2014

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“…The smaller nanoparticles also show a higher rate of cellular uptake than larger ones. 7,8 Conventional approaches for preparing drugloaded PLGA nanoparticles include emulsion-solvent evaporation, nanoprecipitation and polymerization. 9 Among these techniques, nanoprecipitation can easily produce small PLGA nanoparticles (<100 nm) by dissolving the polymer and drug in organic solution followed by adding aqueous solution.…”

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confidence: 99%

A microfluidic origami chip for synthesis of functionalized polymeric nanoparticles

Sun

Xianyu

et al. 2013

Nanoscale

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“…It has been reported that H 2 O 2 can directly etch gold nanorods in the presence of CTAB. 38,39 Most recently, Ni and co-workers also proposed and certified a Br 3 − mediated etching of GNRs by H 2 O 2 . 40 However, in our system, 0.2 mM H 2 O 2 induced a very tiny change of LSPR of GNRs with the presence of 10 mM CTAB ( Figure S1), which is also consistent with the previous results that H 2 O 2 below 10 mM led to negligible oxidation of GNRs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The GNRs were synthesized using a modified method by changing the amount of AgNO 3 . 34 (1) Seed Solution: To 7.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Ultrasensitive Visual Sensing of Molybdate Based on Enzymatic-like Etching of Gold Nanorods

Zhang

Chen

2015

Langmuir

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Here, we have developed a novel approach to the visual detection of molybdate with high sensitivity and selectivity in aqueous media based on the combination of catalytic formation of iodine and iodine-mediated etching of gold nanorods. In weak acid solution, like peroxidase, molybdate can catalyze the reaction between H 2 O 2 and I − to produce I 2 , a moderate oxidant, which then etches gold nanorods preferentially along the longitudinal direction in the presence of hexadecyltrimethylammonium bromide. The etching results in the longitudinal localized surface plasmon resonance extinction peak shifts to short wavelength, accompanied by a color change from blue to red. Under optimal conditions, this sensor exhibits good sensitivity with a detection limit of 1.0 nM. The approach is highlighted by its high selectivity and tolerance to interference, which enables the sensor to detect molybdate directly in real samples, such as tap water, drinking water, and seawater. In addition, perhaps the proposed sensing strategy can be also used for other targets that can selectively regulate the formation of I 2 under given conditions.

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Gold nanoparticles for the colorimetric and fluorescent detection of ions and small organic molecules

Cited by 394 publications

References 141 publications

Sensitive Colorimetric Visualization of Perfluorinated Compounds Using Poly(ethylene glycol) and Perfluorinated Thiols Modified Gold Nanoparticles

Sensitive Colorimetric Visualization of Perfluorinated Compounds Using Poly(ethylene glycol) and Perfluorinated Thiols Modified Gold Nanoparticles

A microfluidic origami chip for synthesis of functionalized polymeric nanoparticles

Ultrasensitive Visual Sensing of Molybdate Based on Enzymatic-like Etching of Gold Nanorods

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