Star-like copolymer stabilized noble-metal nanoparticle powders

Cao, Peng; Yan, Yun; Mangadlao, Joey Dacula; Rong, Li; Advincula, Rigoberto C.

doi:10.1039/c5nr07000g

Cited by 14 publications

(23 citation statements)

References 60 publications

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“…In the sensing system, AuNPs aggregation triggered only by interactions with a particular target is expected, which can greatly improve the specificity and selectivity of the colorimetric sensor. However, AuNPs prepared by traditional small-molecule reduction methods easily aggregate under the conditions of strong acid, solid state, or excess ion concentrations [16,17], which can interfere with the Ag + detection. Therefore, the stability of AuNPs is a major obstacle to practical applications.…”

Section: Introductionmentioning

confidence: 99%

Green and Facile Synthesis of Highly Stable Gold Nanoparticles via Hyperbranched Polymer In-Situ Reduction and Their Application in Ag+ Detection and Separation

Liu

Zhu

et al. 2018

Polymers

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Abstract:The development of a green and facile strategy for synthesizing high stable gold nanoparticles (AuNPs) is still highly challenging. Additionally, the main problems regarding AuNPs based colorimetric sensors are their poor selectivity and low sensitivity, as well their tendency to aggregate during their synthesis and sensing process. Herein, we present an in-situ reduction strategy to synthesize thermoresponsive hyperbranched polymer (i.e., Hyperbranched polyethylenimine-terminal isobutyramide (HPEI-IBAm)) functionalized AuNPs. The HPEI-IBAm-AuNPs show excellent thermal stability up to 200 • C, high tolerance of a wide range of pH value (3-13), and high salt resistance. HPEI-IBAm acted as the template, the reducing agent, and the stabilizing agent for the preparation of AuNPs. The HPEI-IBAm-AuNPs can be used as colorimetric sensors for the detection of Ag + . In the detecting process, HPEI-IBAm serves as a trigger agent to cause an unusual color change from red to brown. This new non-aggregation-based colorimetric sensor showed high stability (maintaining the color lasting without fading), high selectivity, and high sensitivity with an extremely low detection limit of 7.22 nM and a good linear relationship in a wide concentration range of 0-2.0 mM (R 2 = 0.9921). Significantly, based on the thermoresponsive property of the HPEI-IBAm, the AuNPs/Ag composites can be separated after sensing detection, which can avoid secondary pollutions. Therefore, the green preparation and the applications of the unusual colorimetric sensor truly embody the concepts of energy saving, environmental protection, and sustainable development.

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Section: Introductionmentioning

confidence: 99%

Green and Facile Synthesis of Highly Stable Gold Nanoparticles via Hyperbranched Polymer In-Situ Reduction and Their Application in Ag+ Detection and Separation

Liu

Zhu

et al. 2018

Polymers

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“…It has been reported that the order of the binding strength is Au-S > Au-NH2 > Au-COOH. [25,26] Therefore, the hyperbranched polyethylenimine derivative with a large number of thiol groups (HPEI-SH) as multidentate ligand will further improve the stability of AuNPs/analyte composites and be benefit for testing.…”

mentioning

confidence: 99%

Red to brown to green colorimetric detection of Ag+ based on the formation of Au-Ag core-shell NPs stabilized by a multi-sulfhydryl functionalized hyperbranched polymer

Liu

Dai

et al. 2016

Sensors and Actuators B: Chemical

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The hyperbranched polyethylenimine (HPEI) derivative with thiol (SH) terminals was synthesized and used as multidentate ligand to stabilize AuNPs/analyte composites. A facile and rapid colorimetric method for the sensitive and selective detection of Ag + based on the formation of Au-Ag core-shell NPs with three color changes (red through brown to green) was developed. Successive multiple color changes can greatly improve the specificity and selectivity of this colorimetric sensor owing to the lower possibility of false positive results. Other environmentally relevant metal ions did not interfere with the determination of Ag +. The response (i.e., the absorbance at 600 nm, A600 nm) was linearly proportional to the Ag + concentration in a range from 8.76×10-9 to 1.27×10-4 M with a detection limit of 8.76×10-8 M by the naked eyes and 8.76×10-9 M by the UV-vis spectra. For the first time, this novel colorimetric sensor based on multiple color changes was developed and successfully applied to detect Ag + in real samples.

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“…Transmission electron microscopy (TEM) image of Au/PATP/Hemin nanoprobe showed uniform and monodisperse spherical structures with an average dimeter of ∼36 nm (Figure A). The amounts of PATP and hemin conjugated on a single Au nanoparticle were calculated to be 5.867 × 10 3 and 4.231 × 10 2 (Figure S2) by measurement with UV–vis spectroscopy and particle size analyzer. − …”

Section: Results and Discussionmentioning

confidence: 99%

para-Aminothiophenol Radical Reaction-Functionalized Gold Nanoprobe for One-to-All Detection of Five Reactive Oxygen Species In Vivo

et al. 2018

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Five major reactive oxygen species (ROS) are generated in diseases including HO, OH, O, ROO, and O. Simultaneous detection of the five ROS with a single probe is crucial for a comprehensive understanding of the development and progression of many diseases, such as cancer and inflammatory diseases. However, currently reported detection systems are limited by targeting one ROS with one probe. This one-to-one detection mode may fail to sufficiently unveil the diseased state. In this study, we achieved simultaneous detection of all the five ROS with one probe (i.e., one-to-all detection), by designing a novel para-aminothiophenol (PATP) and hemin-decorated gold (Au/PATP/Hemin) nanoprobe. The design is principled by our discovery that PATP can react with OH, O, ROO, and O by a radical oxidative coupling mechanism to form 4,4'-dimercaptoazobenzene (DMAB). The DMAB then elicited strong characteristic surface-enhanced Raman scattering (SERS) peaks at 1142, 1386, and 1432 cm; which in turn enables direct detection of OH, O, ROO, and O and indirect detection of HO by hemin-catalyzed fenton reaction to convert HO into OH. In two representative ROS-elevated mice models of tumors and allergic dermatitis, the Au/PATP/Hemin nanoprobe demonstrated its robust performance of monitoring tumor development and inflammation progression in a highly sensitive and quantitative manner.

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Star-like copolymer stabilized noble-metal nanoparticle powders

Cited by 14 publications

References 60 publications

Green and Facile Synthesis of Highly Stable Gold Nanoparticles via Hyperbranched Polymer In-Situ Reduction and Their Application in Ag+ Detection and Separation

Green and Facile Synthesis of Highly Stable Gold Nanoparticles via Hyperbranched Polymer In-Situ Reduction and Their Application in Ag+ Detection and Separation

Red to brown to green colorimetric detection of Ag+ based on the formation of Au-Ag core-shell NPs stabilized by a multi-sulfhydryl functionalized hyperbranched polymer

para-Aminothiophenol Radical Reaction-Functionalized Gold Nanoprobe for One-to-All Detection of Five Reactive Oxygen Species In Vivo

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