Silver nanoparticles as highly efficient and selective optical probe for sulphide via dendrimer formation in aqueous medium

1-[(4-Nitrophenyl)azo]-2-naphthol capped AgNPs were evaluated as a colorimetric sensor for S2− in aqueous medium over pH 4 to 10 with a nanomolar detection limit. The TEM, SEM and AFM images revealed the transition of spherical AgNPs into dendrimers.

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Selective Colorimetric Sensors for Cyanide and Acetate Ion in Partially Aqueous Medium

10.20944/preprints201803.0225.v1 ◽

2018 ◽

Author(s):

Divya Singhal ◽

Neha Gupta ◽

Ashok Kumar Singh

Keyword(s):

Detection Limit ◽

Aqueous Medium ◽

1H Nmr ◽

Binding Constant ◽

High Selectivity ◽

Good Sensitivity ◽

Dft Studies ◽

Nmr Titration ◽

1H Nmr Titration ◽

Nanomolar Detection

4-(thiazol-2-yldiazenyl)phenol (L1) and 2-((4-hydroxyphenyl) diazenyl)-5-nitrophenol (L2) based on azo phenol were synthesised and used as selective colorimetric sensor for CN- and AcO− ion in DMSO/H2O-HEPES (v/v; 1:1, pH–7.3 ± 0.2) and showed good sensitivity with large red shifts and nanomolar detection limit for CN- and AcO- ion. The stoichiometry of L1 with CN−/AcO− ion was found to be 1:1 and L2 with CN−/AcO− ion was found to be 1:2. Binding constant for L1+ CN−, L1 + AcO−, L2 + CN− and L2 + AcO− were calculated by B-H plot as 1.6 × 103, 8.0 × 102, 8.4 × 103 and 1.7 × 102 respectively. L2 showed high selectivity towards CN− ion with low detection limit of 81 nM and large binding constant. In addition, 1H NMR titration and DFT studies also supported the deprotonation mechanism of receptors in the presence of selective anions.

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Highly Efficient Colorimetric Sensor for Selective and Sensitive Detection of Arsenite Ion (III) in Aqueous Medium

Journal of Fluorescence ◽

10.1007/s10895-019-02401-4 ◽

2019 ◽

Vol 29 (4) ◽

pp. 813-818 ◽

Cited By ~ 2

Author(s):

Appadurai Deepa ◽

Vediappen Padmini

Keyword(s):

Aqueous Medium ◽

Colorimetric Sensor ◽

Sensitive Detection ◽

Highly Efficient

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A novel rhodamine-based optical probe for mercury(II) ion in aqueous medium: A nanomolar detection, wide pH range and real water sample application

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/j.saa.2019.117504 ◽

2020 ◽

Vol 225 ◽

pp. 117504 ◽

Cited By ~ 11

Author(s):

Sagar K. Patil ◽

Dipanwita Das

Keyword(s):

Water Sample ◽

Aqueous Medium ◽

Optical Probe ◽

Nanomolar Detection ◽

Wide Ph Range ◽

Sample Application ◽

Ph Range ◽

Real Water Sample

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Green synthesis of methyl gallate conjugated silver nanoparticles: a colorimetric probe for gentamicin

New Journal of Chemistry ◽

10.1039/c8nj04565h ◽

2019 ◽

Vol 43 (4) ◽

pp. 1972-1979 ◽

Cited By ~ 3

Author(s):

Noor ul Ain ◽

Zara Aslam ◽

Muhammad Yousuf ◽

Waqas Ahmed Waseem ◽

Samina Bano ◽

...

Keyword(s):

Silver Nanoparticles ◽

Green Synthesis ◽

Colorimetric Sensor ◽

Methyl Gallate ◽

Colorimetric Probe ◽

Highly Efficient

A highly efficient colorimetric sensor for gentamicin is proposed based on methyl gallate conjugated silver nanoparticles.

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Colorimetric Sensor Based on Silver Nanoparticle – Embedded Polymethacrylate Matrix

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1040.923 ◽

2014 ◽

Vol 1040 ◽

pp. 923-927 ◽

Cited By ~ 5

Author(s):

Nataliya A. Gavrilenko ◽

Nadezhda V. Saranchina ◽

Mikhail A. Gavrilenko

Keyword(s):

Hydrogen Peroxide ◽

Silver Nanoparticles ◽

Thermal Treatment ◽

Aqueous Medium ◽

Silver Nanoparticle ◽

Colorimetric Assay ◽

Colorimetric Sensor ◽

Yellow Color ◽

Transparent Color ◽

Polymethacrylate Matrix

Silver nanoparticles synthesized by a reagent less method involving only thermal treatment have been used in colorimetric assay for the detection of hydrogen peroxide. The silver nanoparticles were directly synthesized in polymethacrylate matrix (PMM) by method based on the reduction of the inorganic precursor AgNO3, which was pre-adsorbed by PMM from solution, through thermal treatment. These silver nanoparticles were characterized using absorption spectroscopy. It was shown that the silver nanoparticles in PMM (Ag – PMM) had ability for reduction of hydrogen peroxide with silver oxidation. As a result, the yellow color of Ag – PMM samples was gradually changed to transparent color depending on the hydrogen peroxide concentrations. Hence, the silver nanoparticles in PMM could be used as colorimetric sensor for hydrogen peroxide in aqueous medium.

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