Colorimetric Detection of Cr3+ in Aqueous Solution Based on Cofunctionalized Silver Nanoparticles Modified with 4-Nitrobenzenethiol and 4-Mercaptobenzoic Acid

NANO ◽  
2015 ◽  
Vol 10 (07) ◽  
pp. 1550095 ◽  
Author(s):  
Zhikun Zhang ◽  
Ying Zhou ◽  
Jing-Kui Yang ◽  
Peilong Wang ◽  
Xiaoou Su ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Color Change ◽  
Colorimetric Detection ◽  
Ligand Interaction ◽  
Bright Yellow ◽  
Colorimetric Response ◽  
Icp Ms ◽  
Highly Sensitive ◽  
Highly Sensitive Detection ◽  
Good Agreement

A new method has been proposed to realize the visual detection of Cr 3+ using 4-nitrobenzenethiol (4-NBT) and 4-mercaptobenzoic acid (4-MBA) modified silver nanoparticles ( AgNPs ). The presence of Cr 3+ induces the aggregation of AgNPs through cooperative metal–ligand interaction, resulting in a color change from bright yellow to purple. Consequently, Cr 3+ could be monitored by colorimetric response of AgNPs by a UV-Vis spectrophotometer or even naked eyes. We firstly used ethylene diamine tetraacetic acid (EDTA) as a masking agent to selectively detect Cr 3+, and other metal ions have little influence on the Cr 3+– AgNPs system. The cofunctionalized AgNPs exhibited a highly sensitive detection limit of Cr 3+, which is as low as 5 × 10-9 mol L-1, and the absorbance ratio (A600nm/A387nm) is linear with the concentration of Cr 3+ ranging from 5 × 10-9 mol L-1 to 2 × 10-6 mol L-1 with a coefficient of 0.993. Particularly, the sensor has been further evaluated to monitor the concentration of Cr 3+ in drinking water, the recovery was in good agreement with those obtained by ICP-MS, indicating that this proposed method is successfully applied in real samples.

scholarly journals Functionalized Silver Nano-Sensor for Colorimetric Detection of Hg2+ Ions: Facile Synthesis and Docking Studies

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2698 ◽  
Author(s):  
Kollur Shiva Prasad ◽  
Govindaraju Shruthi ◽  
Chandan Shivamallu
Keyword(s):  
Silver Nanoparticles ◽  
Color Change ◽  
Colorimetric Detection ◽  
Docking Studies ◽  
Facile Synthesis ◽  
Colorimetric Response ◽  
Yellow Color ◽  
Deep Yellow ◽  
Uv Visible ◽  
Average Size

In the present study, we describe the facile synthesis of silver nanoparticles (AgNPs) and their nanostructures functionalized with 2-aminopyrimidine-4,6-diol (APD-AgNPs) for Hg2+ ion detection. The promising colorimetric response of APD-AgNPs to detect Hg2+ ions was visible with naked eyes and spectroscopic changes were examined by using a UV-Visible spectrophotometer. The aggregation of APD-AgNPs upon addition of Hg2+ ions was due to the chelation effect of the functionalized nanostructures and results in a color change from pale brown to deep yellow color. The probing sensitivity was observed within five minutes with a detection limit of about 0.35 µM/L. The TEM images of APD-AgNPs showed polydispersed morphologies with hexagonal, heptagonal and spherical nanostructures with an average size between 10 to 40 nm. Furthermore, the sensing behavior of APD-AgNPs towards Hg2+ ions detection was investigated using docking and interaction studies.

scholarly journals In-Situ Grown Silver Nanoparticles on Nonwoven Fabrics Based on Mussel-Inspired Polydopamine for Highly Sensitive SERS Carbaryl Pesticides Detection

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 384 ◽  
Author(s):  
Zhiliang Zhang ◽  
Tiantian Si ◽  
Jun Liu ◽  
Guowei Zhou
Keyword(s):  
Silver Nanoparticles ◽  
Collection Efficiency ◽  
High Sensitivity ◽  
Sers Substrate ◽  
Analytical Sensitivity ◽  
Sers Substrates ◽  
Rapid Sampling ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

The rapid sampling and efficient collection of target molecules from a real-world surface is fairly crucial for surface-enhanced Raman scattering (SERS) to detect trace pesticide residues in the environment and in agriculture fields. In this work, a versatile approach was exploited to fabricate a flexible SERS substrate for highly sensitive detection of carbaryl pesticides, using in-situ grown silver nanoparticles (AgNPs)on non-woven (NW) fabric surfaces based on mussel-inspired polydopamine (PDA) molecules. The obtained NW@PDA@AgNPs fabrics showed extremely sensitive and reproducible SERS signals toward crystal violet (CV) molecules, and the detection limit was as low as 1.0 × 10−12 M. More importantly, these NW@PDA@AgNPs fabrics could be directly utilized as flexible SERS substrates for the rapid extraction and detection of trace carbaryl pesticides from various fruit surfaces through a simple swabbing approach. It was identified that the detection limits of carbaryl residues from apple, orange, and banana surfaces were approximately decreased to 4.02 × 10−12, 6.04 × 10−12, and 5.03 × 10−12 g, respectively, demonstrating high sensitivity and superior reliability. These flexible substrates could not only drastically increase the collection efficiency from multifarious irregular-shaped matrices, but also greatly enhance analytical sensitivity and reliability for carbaryl pesticides. The fabricated flexible and multifunctional SERS substrates would have great potential to trace pesticide residue detection in the environment and bioscience fields.

Zwitterionic peptide-capped gold nanoparticles for colorimetric detection of Ni2+

Nanoscale ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 5466-5473 ◽  
Author(s):  
Attasith Parnsubsakul ◽  
Sukunya Oaew ◽  
Werasak Surareungchai
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Sensitive Detection ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

Recyclable zwitterionic peptide-capped AuNPs for highly sensitive detection of Ni2+.

A method for highly sensitive detection of silver nanoparticles using a micro-resonator and DNA assisted conjugation

2020 ◽  
Vol 34 (4) ◽  
pp. 1675-1681
Author(s):  
Kuewhan Jang ◽  
Chanho Park ◽  
Wooboum Park ◽  
Jaekyeong Park ◽  
Kyoungwoo Park ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Sensitive Detection ◽  
Highly Sensitive ◽  
Micro Resonator ◽  
Highly Sensitive Detection

scholarly journals A New Fluorescent Chemosensor for Cobalt(II) Ions in Living Cells Based on 1,8-Naphthalimide

Molecules ◽  
2019 ◽  
Vol 24 (17) ◽  
pp. 3093 ◽  
Author(s):  
Yu-Long Liu ◽  
Liu Yang ◽  
Lu Li ◽  
You-Quan Guo ◽  
Xiao-Xiao Pang ◽  
...  
Keyword(s):  
Fluorescence Enhancement ◽  
Color Change ◽  
Limit Of Detection ◽  
Fluorescent Sensor ◽  
Cell Permeability ◽  
Fluorescent Chemosensor ◽  
Fluorescent Method ◽  
Colorimetric Response ◽  
Highly Sensitive ◽  
Distinct Color

In this work, a highly selective fluorescent chemosensor N-(2-(2-butyl-1,3-dioxo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)hydrazine-1-carbonothioyl)benzamide (L) was prepared and characterized. An assay to detect the presence of cobalt(II) ions was developed by utilizing turn-on fluorescence enhancement with visual colorimetric response. Upon treatment with Co2+, a remarkable fluorescence enhancement located at 450 nm was visible to naked eyes accompanied with a distinct color change (from pink to colorless) in a CH3CN/HEPES (4/1, v/v, pH = 7.4) solution due to the formation of a 1:1 complex at room temperature. In addition, the linear concentration range for Co2+ was 0–25 µM with the limit of detection down to 0.26 µM. Thus, a highly sensitive fluorescent method based on chelation-assisted fluorescence enhancement was developed for the trace-level detection of Co2+. The sensor was found to be highly selective toward Co2+ ions with a large number of coexisting ions. Furthermore, the L probe can serve as a fluorescent sensor for Co2+ detecting in biological environments, demonstrating its low toxic properties to organisms and good cell permeability in live cell imaging.

Water-dispersible silicon dots as a peroxidase mimetic for the highly-sensitive colorimetric detection of glucose

2014 ◽  
Vol 50 (51) ◽  
pp. 6771-6774 ◽  
Author(s):  
Qiong Chen ◽  
Meiling Liu ◽  
Jiangna Zhao ◽  
Xue Peng ◽  
Xiaojiao Chen ◽  
...  
Keyword(s):  
Color Change ◽  
Colorimetric Detection ◽  
Water Dispersible ◽  
Peroxidase Mimetic ◽  
Highly Sensitive

We demonstrate that photoluminescent Si-dots exhibit an intrinsic peroxidase-like activity, and can catalyze the oxidization of 3,3′,5,5′-tetramethylbenzidine (TMB) by H2O2, and produce a color change.

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