A single gold nanoprobe for colorimetric detection of silver(i) ions with dark-field microscopy

The Analyst ◽  
2019 ◽  
Vol 144 (6) ◽  
pp. 2011-2016 ◽  
Author(s):  
Yi Fen Xie ◽  
Yun Ying Cheng ◽  
Meng Li Liu ◽  
Hong Yan Zou ◽  
Cheng Zhi Huang
Keyword(s):  
Signal Transduction ◽  
Gold Nanoparticles ◽  
Lake Water ◽  
Water Samples ◽  
Color Change ◽  
Colorimetric Detection ◽  
Dark Field ◽  
Microscopy Imaging ◽  
Dark Field Microscopy ◽  
Gold Nanoprobe

In this work, the formation of C–Ag+–C bonding between cytosines was utilized to induce interparticle coupling of gold nanoparticles modified with single-strand DNA, resulting in a color change as the signal transduction to quantify Ag+ sensitively under dark-field microscopy imaging, while we achieved the quantification of Ag+ could be directly realized in lake water samples and drug samples.

Precision improvement in dark-field microscopy imaging by using gold nanoparticles as an internal reference: a combined theoretical and experimental study

Nanoscale ◽  
2016 ◽  
Vol 8 (16) ◽  
pp. 8729-8736 ◽  
Author(s):  
Jun Ma ◽  
Yue Liu ◽  
Peng Fei Gao ◽  
Hong Yan Zou ◽  
Cheng Zhi Huang
Keyword(s):  
Experimental Study ◽  
Gold Nanoparticles ◽  
Measurement Errors ◽  
Dark Field ◽  
Internal Reference ◽  
Microscopy Imaging ◽  
Microscopic Imaging ◽  
Dark Field Microscopy

The internal reference (IR) was introduced to dark-field microscopic imaging (iDFM) technique to reduce the large unavoidable measurement errors, and improved precision of the acquired signals has been obtained.

Preparation of Poly(Acrylic Acid) Crosslinked-Gold Nanoparticles for Colorimetric Detection of Analytes

2019 ◽  
Vol 950 ◽  
pp. 138-143
Author(s):  
Erindyah Retno Wikantyasning ◽  
Mutmainnah Mutmainnah ◽  
Ghiyats Ramadhan ◽  
Zakky Cholisoh ◽  
Muhammad Da'i
Keyword(s):  
Gold Nanoparticles ◽  
Herbal Medicine ◽  
Acrylic Acid ◽  
Color Change ◽  
Colorimetric Detection ◽  
Ph Responsive ◽  
Herbal Medicine Product ◽  
Responsive Polymer ◽  
Medicine Product ◽  
Poly Acrylic Acid

The aims of this study are to synthesize and characterize gold nanoparticles (AuNPs) crosslinked by pH-responsive polymer poly (acrylic acid) (PAA) and its application for detection of some analytes in herbal medicine product. In this study, a pH-responsive polymer, poly (acrylic acid) was prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization method. The polymer was then cross-linked by gold nanoparticles, which was synthesized by the Turkevich method. The response of the AuNPs-crosslinked PAA was observed by the color change from red to blue at a specific pH (4-5) and was characterized by TEM. The reversible color change was resulted from aggregation and disaggregation of the AuNPs due to the shrinking and swelling of the polymer when different pH was introduced as a stimulant. This sensor has the capability of recognizing analytes such as aspirin and tolbutamide added in the herbal medicine product at the concentration of 0.04-0.05 M.

scholarly journals Facile and One Pot Synthesis of Gold Nanoparticles Using Tetraphenylborate and Polyvinylpyrrolidone for Selective Colorimetric Detection of Mercury Ions in Aqueous Medium

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Sidhureddy Boopathi ◽  
Shanmugam Senthilkumar ◽  
Kanala Lakshminarasimha Phani
Keyword(s):  
Gold Nanoparticles ◽  
Alkaline Medium ◽  
Color Change ◽  
Colorimetric Detection ◽  
Spherical Shape ◽  
Reducing Agent ◽  
Nanoparticle Dispersion ◽  
Mercury Ions ◽  
One Pot ◽  
Resonance Band

In this work, we reported for the first time, a facile and one step synthesis of gold nanoparticles from HAuCl4, employing tetraphenylborate as the reducing agent. The synthesis is not only facile but also yields “dumb-bell-shaped”particles. This shape appears to arise from a possible emulsion of the products of oxidation/decomposition of tetraphenylborate by HAuCl4, surrounding the particle. The size and shape of the AuNPs were characterized by Transmission electron microscopy (TEM) and UV-visible Spectroscopy. Interestingly, the addition of polyvinylpyrrolidone (PVP) during the synthesis was found to enhance the stability of the nanoparticle dispersion. The particles synthesized under these conditions assume “spherical” shape with the appearance of only transverse surface plasmon resonance band. The highlight of the observations is that the gold nanoparticles synthesized using tetraphenylborate as reducing agent and PVP as stabilizer are highly stable in alkaline medium, in contrast to the synthesis wherein borohydride is used as reducing agent. The AuNPs synthesized using tetraphenylborate and PVP show their mercury sensing behavior only in the alkaline medium. The color of the nanoparticle dispersion undergoes distinct color change from pink to blue with the addition of mercury ions. They also show dramatic selectivity to mercury ions in presence of other interfering ions, Pb2+, Zn2+and Ca2+.

A galvanic exchange process visualized on single silver nanoparticles via dark-field microscopy imaging

Nanoscale ◽  
2018 ◽  
Vol 10 (26) ◽  
pp. 12805-12812 ◽  
Author(s):  
Jun Zhou ◽  
Tong Yang ◽  
Wei He ◽  
Zi Yu Pan ◽  
Cheng Zhi Huang
Keyword(s):  
Silver Nanoparticles ◽  
Light Scattering ◽  
Reaction Kinetics ◽  
Removal Rate ◽  
Exchange Process ◽  
Dark Field ◽  
Gold Deposition ◽  
Microscopy Imaging ◽  
Dark Field Microscopy ◽  
Kinetics Of

A galvanic exchange (GE) process was visually monitored in real-time using light scattering dark-field microscopy imaging, through which the reaction kinetics of the GE process was visualized and the silver removal rate and gold deposition rate on single nanoparticles were revealed.

Microfluidic paper-based analytical device using gold nanoparticles modified with N,N′-bis(2-hydroxyethyl)dithiooxamide for detection of Hg(ii) in air, fish and water samples

2020 ◽  
Vol 44 (43) ◽  
pp. 18662-18667
Author(s):  
Sattar Shariati ◽  
Gholamreza Khayatian
Keyword(s):  
Gold Nanoparticles ◽  
Water Samples ◽  
Visual Detection ◽  
Color Change ◽  
Digital Camera ◽  
New Method ◽  
Naked Eye ◽  
Analytical Device

A new method for visual detection of mercury by color change is developed that can detect Hg2+ by the naked eye or a digital camera.

scholarly journals Developing Hollow-Channel Gold Nanoflowers as Trimodal Intracellular Nanoprobes

2018 ◽  
Vol 19 (8) ◽  
pp. 2327 ◽  
Author(s):  
Sunjie Ye ◽  
May Wheeler ◽  
James McLaughlan ◽  
Abiral Tamang ◽  
Christine Diggle ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Single Cell Analysis ◽  
Surface Enhanced Raman Spectroscopy ◽  
Dark Field ◽  
Microscopy Imaging ◽  
Gold Nanoflowers ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Spherical Gold Nanoparticles ◽  
Low Cytotoxicity

Gold nanoparticles-enabled intracellular surface-enhanced Raman spectroscopy (SERS) provides a sensitive and promising technique for single cell analysis. Compared with spherical gold nanoparticles, gold nanoflowers, i.e., flower-shaped gold nanostructures, can produce a stronger SERS signal. Current exploration of gold nanoflowers for intracellular SERS has been considerably limited by the difficulties in preparation, as well as background signal and cytotoxicity arising from the surfactant capping layer. Recently, we have developed a facile and surfactant-free method for fabricating hollow-channel gold nanoflowers (HAuNFs) with great single-particle SERS activity. In this paper, we investigate the cellular uptake and cytotoxicity of our HAuNFs using a RAW 264.7 macrophage cell line, and have observed effective cellular internalization and low cytotoxicity. We have further engineered our HAuNFs into SERS-active tags, and demonstrated the functionality of the obtained tags as trimodal nanoprobes for dark-field and fluorescence microscopy imaging, together with intracellular SERS.

Real-time monitoring of oxidative etching on single Ag nanocubes via light-scattering dark-field microscopy imaging

Nanoscale ◽  
2015 ◽  
Vol 7 (37) ◽  
pp. 15209-15213 ◽  
Author(s):  
Yi Wang ◽  
Hong Yan Zou ◽  
Cheng Zhi Huang
Keyword(s):  
Light Scattering ◽  
Real Time ◽  
Dark Field ◽  
Real Time Monitoring ◽  
Microscopy Imaging ◽  
Real Time Mode ◽  
Oxidative Etching ◽  
Dark Field Microscopy

Oxidative etching on single Ag nanocubes was monitored in real-time mode through light-scattering dark-field microscopy imaging.

Selective colorimetric detection of Cr(iii) and Cr(vi) using gallic acid capped gold nanoparticles

2016 ◽  
Vol 45 (20) ◽  
pp. 8347-8354 ◽  
Author(s):  
Chen Dong ◽  
Genhua Wu ◽  
Zhuqing Wang ◽  
Wenzhi Ren ◽  
Yujie Zhang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Gallic Acid ◽  
Color Change ◽  
Colorimetric Assay ◽  
Colorimetric Detection ◽  
Selective Detection

A colorimetric assay is proposed for the selective detection of Cr(iii) and Cr(vi) via the aggregation-induced color change of gallic acid capped gold nanoparticles (GA-AuNPs).

Colorimetric Detection of Melamine Based on Poly-Thymine Stabilized Gold Nanoparticles

2013 ◽  
Vol 790 ◽  
pp. 619-622
Author(s):  
Chong Jin ◽  
Hui Min Zhao ◽  
Meng Liu ◽  
Jun Ping Tian ◽  
Xie Quan
Keyword(s):  
Gold Nanoparticles ◽  
Color Change ◽  
Limit Of Detection ◽  
Pure Water ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Milk Powder ◽  
Aggregation Process ◽  
Naked Eye ◽  
Fresh Milk

A simple, fast and reliable colorimetric method for melamine detection based on gold nanoparticles (AuNPs) and poly-thymine (poly-T) is reported. Poly-T strands attract AuNPs through static electricity and keep them stable against aggregation in the presence of NaCl. The affinity between melamine and poly-T, hydrogen bond, frees AuNP from the protection provided by poly-T and thus makes AuNPs aggregate in the presence of NaCl. The color change of AuNPs from wine red to blue can be observed immediately by the naked eye during the aggregation process, and can be accurately recorded with the help of a UV/vis spetrophotometer within 5 minutes. The limit of detection (LOD) of melamine in pure water is 0.146 μmol/L with a linear range from 0.2×10-7 mol/L to 10.0×10-7 mol/L. In fresh milk and milk powder, the LOD is respectively as low as 2.37 μmol/L and 5.36 μmol/L.

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