High-Throughput Sulfide Sensing with Colorimetric Analysis of Single Au–Ag Core–Shell Nanoparticles

Hao, Jinrui; Xiong, Bin; Cheng, Xiaodong; He, Yan; Yeung, Edward S.

doi:10.1021/ac500376e

Cited by 108 publications

(75 citation statements)

References 25 publications

(38 reference statements)

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“…So far people have been using micron-sized passive particles to trace the hydrodynamics of the bacterial environment. During the past decade, our research group have developed a series of nano-imaging techniques capable of tracing single plasmonic nanoparticles with high sensitivity and high resolution [66][67][68][69][70][71]. Inspired by single particle tracing at the micron-scale, it is expected that a lot of new information on the collective motion of bacteria could be obtained by tracking the spatial and temporal variation of multiple single nanoparticle tracers at the nanoscale.…”

Section: Outlooksmentioning

confidence: 99%

Collective motion of bacteria and their dynamic assembly behavior

Feng

2017

Sci. China Mater.

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In recent years, active matter systems have attracted considerable attentions due to their complex dynamic behaviors in physical and material science. In particular, microorganism systems have served as model systems for observing dynamic assembly and collective motility of active particles and significant progresses have been made on in-depth understanding of how high density bacteria colony behaves in the non-equilibrium state. In this mini-review, we mainly focus on the collective motion of bacteria and their dynamic assembly from four aspects: (1) the general phenomenon and biological mechanism of bacterial collective motion; (2) the common experimental techniques for studying bacterial motility; (3) some active systems on exploring bacterial collective behavior, which include both non-restricted free suspensions and those in relative confined geometric space; (4) the phenomenological and descriptive statistical methods and physical models on the underlying laws that lead to large-scale coordinate patterns in multicellular systems. This review aims to give a general picture of the collective motion in bacterial active matter systems experimentally and theoretically in order to reflect the interplays between individuals among populations in motion. It is expected that the general regulation rules related to the boundary effects in the complex systems and materials can be elucidated to some extent.

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Section: Outlooksmentioning

confidence: 99%

Collective motion of bacteria and their dynamic assembly behavior

Feng

2017

Sci. China Mater.

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“…Colorimetric methods are suitable for real‐time and on‐the‐spot detection of analytes because it minimizes the demand for complex instrumentation or skilled operators by producing results directly with visual observation or UV scanning . Compared to organic dyes employed in traditional colorimetric methods, plasmonic metal nanoparticles (NPs) such as Au, Ag, and Cu NPs have drawn much attention due to their high extinction molar coefficients, and size‐ and composition‐dependent localized surface plasmon resonance (LSPR) in the visible regions .…”

Section: Introductionmentioning

confidence: 99%

Au/AgI Dimeric Nanoparticles for Highly Selective and Sensitive Colorimetric Detection of Hydrogen Sulfide

Zeng

Liu

et al. 2018

Adv Funct Materials

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The development of Au/AgI dimeric nanoparticles (NPs) is reported for highly selective colorimetric detection of hydrogen sulfide (H 2 S). The detection mechanism is designed by taking advantage of the chemical transformation of AgI to Ag 2 S upon reacting with sulfide, which leads to a shift in the plasmonic band of the attached Au NPs. The plasmonic shift is accompanied by a color change of the solution from purplish red to blue and finally to light green depending on the concentration of sulfide, thus enables a naked-eye readout and UV-vis quantitation of the sulfide exposure. The Au/AgI dimeric NPs are further immobilized in agarose gels to produce test strips, which can be used for both naked-eye readout and quantitative detection of sulfide using UV-vis spectroscopy thanks to its transparency in the visible region. Compared to commercial Pb(Ac) 2 test papers, the agarose gel strip has superior performance for detecting sulfide in terms of sensitivity, selectivity, stability, and fidelity. The agarose gel is also capable of detecting gaseous H 2 S at important concentration thresholds, suggesting its practicability in real life applications. The potential of agarose gels is further highlighted by its ability in the enrichment and colorimetric detection of gaseous H 2 S released during cell cultivation.

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“…30 Therefore, we continue to reduce the aspect ratio of the inner Au nanorods, making the longitudinal LSPR absorption peak to be located at 680 nm. It is well known that the most sensitive region of color perception for the naked human eye is preferentially in the region of 500 to 600 nm.…”

Section: Optimization Of the Au@ag Core-shell Nanorods With The Propementioning

confidence: 99%

A promising direct visualization of an Au@Ag nanorod-based colorimetric sensor for trace detection of alpha-fetoprotein

Zhang

Zhu

et al. 2015

J. Mater. Chem. C

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The Ag coating-induced blue shift and enhancement of longitudinal plasmon of Au nanorods result in abundant and tunable optical absorptions in the visible region, which leads to the Au@Ag nanorod becoming a good candidate for colorimetric sensing. In this paper, we have reported an effective and simple approach for visualization detection of alpha-fetoprotein (AFP) based on Au@Ag core-shell nanorods. The AFP concentration-dependent colloid color of Au@Ag core-shell nanorods could change from green to gray, olivine to brown, and even blue to violet to pink, which are more varied color changes compared with the traditional red to blue color change. Besides, as the Ag shell thickness is increased, a dip was observed, which is located between two strong absorption peaks. The change of the dip is proposed as a new biosensor parameter for biomolecule detection based on absorption spectra.AFP concentration detection could be realized according to the change of the position and intensity of the dip, which has not been reported in the biomolecule detection field so far. Au@Ag core-shell nanorods with a small aspect ratio of inner Au nanorods are more suitable for direct read-out visualization, with a color change from blue to violet to pink. From the point of view of spectra analysis, Au@Ag core-shell nanorods with a greater aspect ratio of inner Au nanorods show higher spectral sensitivity. Furthermore, it is found that non-centrifuged Au@Ag core-shell nanorods are preferentially assembled in a side-by-side fashion with the addition of AFP, which will provide new approaches for other kinds of nanorods in controllable assembly fashions.

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High-Throughput Sulfide Sensing with Colorimetric Analysis of Single Au–Ag Core–Shell Nanoparticles

Cited by 108 publications

References 25 publications

Collective motion of bacteria and their dynamic assembly behavior

Collective motion of bacteria and their dynamic assembly behavior

Au/AgI Dimeric Nanoparticles for Highly Selective and Sensitive Colorimetric Detection of Hydrogen Sulfide

A promising direct visualization of an Au@Ag nanorod-based colorimetric sensor for trace detection of alpha-fetoprotein

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