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.

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 Silver-Nanoparticles Embedded Pyridine-Cholesterol Xerogels as Highly Efficient Catalysts for 4-nitrophenol Reduction

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1486
Author(s):  
Ganesh Shimoga ◽  
Eun-Jae Shin ◽  
Sang-Youn Kim
Keyword(s):  
Silver Nanoparticles ◽  
Trisodium Citrate ◽  
Environmentally Benign ◽  
X Ray Diffraction ◽  
Physico Chemical ◽  
Efficient Reduction ◽  
Nitrophenol Reduction ◽  
Uv Visible ◽  
Average Size

Two xerogels made of 4-pyridyl cholesterol (PC) and silver-nanocomposites (SNCs) thereof have been studied for their efficient reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of aqueous sodium borohydride. Since in-situ silver doping will be effective in ethanol and acetone solvents with a PC gelator, two silver-loaded PC xerogels were prepared and successive SNCs were achieved by using an environmentally benign trisodium citrate dehydrate reducing agent. The formed PC xerogels and their SNCs were comprehensively investigated using different physico-chemical techniques, such as field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), powdered X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-Vis). The FE-SEM results confirm that the shape of xerogel-covered silver nanoparticles (SNPs) are roughly spherical, with an average size in the range of 30–80 nm. Thermal degradation studies were analyzed via the sensitive graphical Broido’s method using a TGA technique. Both SNC-PC (SNC-PC-X1 and SNC-PC-X2) xerogels showed remarkable catalytic performances, with recyclable conversion efficiency of around 82% after the fourth consecutive run. The apparent rate constant (kapp) of SNC-PC-X1 and SNC-PC-X2 were found to be 6.120 × 10-3 sec-1 and 3.758 × 10-3 sec-1, respectively, at an ambient temperature.

scholarly journals Synthesis and Photonics Applications of Afzelechin Conjugated Silver Nanoparticles

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1295
Author(s):  
Shahid Ali ◽  
Muhammad Rahim ◽  
Perveen Fazil ◽  
Malik Shoaib Ahmad ◽  
Azeem Ullah ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Band Gap ◽  
Band Gap Energy ◽  
Visible Absorption ◽  
Force Microscopy ◽  
Atomic Force ◽  
Uv Visible ◽  
Size And Morphology ◽  
Average Size ◽  
20 Nm

The silver nanoparticles were synthesized, functionalized with afzelechin and characterized using UV-Visible spectroscopy. A difference of 20 nm was observed in surface plasmon resonance of bare and functionalized silver nanoparticles which indicates afzelechin conjugation with silver nanoparticles. The atomic force microscopy (AFM) technique was used for the determination of the size and morphology of synthesized silver nanoparticles. The afzelechin conjugated silver nanoparticles were spherical and their sizes ranged from 3 to 10 nm with an average size of 8 nm while the bare silver nanoparticles were also spherical and their sizes ranged from 3 to 10 nm with an average size of 6 nm. The average sizes were also calculated by fitting their UV-Visible absorption spectra. Fitting is based on the Mie and Mie Gans models, which deduced that afzelechin conjugated silver nanoparticles were 96.5% spherical and 3.5% spheroidal with an average size of 5 nm while bare silver nanoparticles were 100% spherical with an average size of 4 nm. Both the fitting model as well as the AFM results showed a difference of 3 nm between the sizes of afzelechin conjugated silver nanoparticles while 2 nm differences was observed for bare silver nanoparticles. The band gap energy of afzelechin conjugated silver nanoparticles and bare silver nanoparticles were calculated via Tauc’s equation and were found to be 5.1 eV and 5.4 eV, respectively. A difference of 0.3 eV was observed in band gap energies of afzelechin conjugated silver nanoparticles and bare silver nanoparticles.

scholarly journals Synthesis Of PEG Coated Ascorbic Acid Functionalized Silver Nanoparticles and Determining its Antioxidant Activity

2019 ◽  
Vol 8 (4S2) ◽  
pp. 741-744
Keyword(s):  
Antioxidant Activity ◽  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Nanoparticle Synthesis ◽  
Drug Carriers ◽  
Functionalized Nanoparticles ◽  
Antioxidative Effects ◽  
Uv Visible ◽  
Average Size ◽  
Scanning Electron

Silver nanoparticles are extensively being studied for various applications in different fields. Functionalized silver nanoparticles are now being used as drug carriers. Ascorbic acid (Vitamin C) is a well-known antioxidant which has been reported to have various beneficial properties to humans. Here we have synthesized silver nanoparticles functionalized with ascorbic acid. The functionalized nanoparticles were further coated with PEG. The nanoparticle synthesis was characterized using UV-Visible spectral analysis, XRD, FTIR and Scanning electron microscope. The average size of the nanoparticle was found to be 24 nm. The synthesized nanoparticle was found to possess antioxidative effects.

Synthesis and Characterization of Sol–Gel Prepared Silver Nanoparticles

2014 ◽  
Vol 13 (01) ◽  
pp. 1450004 ◽  
Author(s):  
Dharamvir Singh Ahlawat ◽  
Rekha Kumari ◽  
Rachna ◽  
Indu Yadav
Keyword(s):  
Silver Nanoparticles ◽  
Absorption Spectra ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Silica Matrix ◽  
Silver Clusters ◽  
Different Temperatures ◽  
Uv Visible ◽  
Average Size

Silver nanoparticles (SNPs) have been successfully prepared using sol–gel method by annealing the sample at 550°C for 30 min. The SNPs were not confirmed by X-ray diffraction (XRD) analysis when the annealing temperature was considered at 450°C. They were also not confirmed without calcination of the sample. The physical mechanism of silver clusters formation in the densified silica matrix with respect to thermal treatment has been understood. The presence of silver metal in the silica matrix was confirmed by XRD analysis and TEM image of the samples. The average size of nanoparticles dispersed in silica matrix was determined as 10.2 nm by the XRD technique. The synthesized nanocomposites were also characterized by UV-Visible spectroscopy with a peak in the absorption spectra at around 375 nm. The distribution of particle size has been reported here in the range from 8 nm to 25 nm by TEM observations of the sample prepared at 550°C. The spherically smaller size (≈10 nm) SNPs have reported the surface plasmons resonance (SPR) peak less than or near to 400 nm due to blue-shifting and effect of local refractive index. Without annealing the silica samples the absorption spectra does not show any peak around 375 nm. The FTIR spectroscopy of the three types of samples prepared at different temperatures (room temperature, 450°C and 550°C) has also been reported. This spectra have provided the identification of different chemical groups in the prepared samples. It has been predicted that the size of SNPs by XRD, UV-Visible and TEM results have agreed well with each other. It may be concluded that formation of SNPs is a function of annealing temperature.

scholarly journals SINTESIS DAN STUDI STABILITAS NANOPARTIKEL PERAK TERTUDUNG ASAM SALISILAT

2019 ◽  
Vol 1 (3) ◽  
pp. 83
Author(s):  
Rizky Noviani Ridwan ◽  
Gusrizal Gusrizal ◽  
Nurlina Nurlina ◽  
Sri Juari Santosa
Keyword(s):  
Silver Nanoparticles ◽  
Salicylic Acid ◽  
Silver Nitrate ◽  
Stability Test ◽  
Capping Agent ◽  
Acid Solutions ◽  
Boiling Water Bath ◽  
Yellow Color ◽  
Size Of Particles ◽  
Average Size

Silver nanoparticles capped with salicylic acid have been synthesized by reduction of silver nitrate with salicylic acid without additional capping agent. In the formation of silver nanoparticles, the solution of silver nitrate was first mixed with the pH 11 salicylic acid solutions at a mole ratio of 1:40. The mixture was heated for 45 minutes in a boiling water bath. The formation of silver nanoparticles was indicated by the appearance of yellow color and monitored using UV-Vis spectrophotometer. The maximum peak of resulted silver nanoparticles appeared in the range of 410-420 nm with the average size of particles was 66±28 nm. Stability test over a period of 16 weeks showed that silver nanoparticles capped with salicylic acid were stable. The results of stability test show that salicylic acid simultaneously act as reducing as well as capping agent in the formation of silver nanoparticles.

scholarly journals Paper-Based Multiplexed Colorimetric Device for the Simultaneous Detection of Salivary Biomarkers

Biosensors ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 443
Author(s):  
Tania Pomili ◽  
Paolo Donati ◽  
Pier Paolo Pompa
Keyword(s):  
Color Change ◽  
Colorimetric Detection ◽  
Simultaneous Detection ◽  
Spectral Shift ◽  
Fully Integrated ◽  
Salivary Biomarkers ◽  
Colorimetric Response ◽  
Test Zone ◽  
One Step ◽  
Pre Treatment

In this study, we describe a monolithic and fully integrated paper-based device for the simultaneous detection of three prognostic biomarkers in saliva. The pattern of the proposed multiplexed device is designed with a central sample deposition zone and three identical arms, each containing a pre-treatment and test zone. Its one-step fabrication is realized by CO2 laser cutting, providing remarkable parallelization and rapidity (ca. 5 s/device). The colorimetric detection is based on the sensitive and selective target-induced reshaping of plasmonic multibranched gold nanoparticles, which exhibit a clear spectral shift (and blue-to-pink color change) in case of non-physiological concentrations of the three salivary biomarkers. A rapid and multiplexed naked-eye or smartphone-based readout of the colorimetric response is achieved within 10 min. A prototype kit for POCT testing is also reported, providing robustness and easy handling of the device.

scholarly journals Silver Nanoparticles AgNPs Preparation by Chemical Method to Obtain Optimal Characteristics of The Pharmaceutical Form and Study Their Effect on The Leishmania Parasite in Laboratory: تحضير جسيمات الفضة النانوية AgNPs بالطريقة الكيميائية للحصول على الخصائص المثلى للشكل الصيدلاني المعتمد ودراسة تأثيرها على طفيلي الليشمانيا مختبريا

2021 ◽  
Vol 5 (3) ◽  
pp. 41-28
Author(s):  
Rama Muhamad Sattout, Ahmad Kamari, Muhamad Muayyad Bilal Rama Muhamad Sattout, Ahmad Kamari, Muhamad Muayyad Bilal
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Reduction ◽  
Leishmania Parasite ◽  
Force Microscopy ◽  
Atomic Force ◽  
Yellow Color ◽  
Artificial Environment ◽  
Pharmaceutical Form ◽  
Average Size ◽  
Hierarchical Morphology

This study aimed first to prepare silver nanoparticles AgNPs in a chemical reduction, The silver nanoparticles AgNPs properties were characterized using spectroscopy of Vision and UV- Visible (UV- Vis), and atomic force microscopy (AFM) and a ZetaSizer device. This study also aimed to study the results effect of preparing Silver nanoparticles on the Leishmania parasite using an artificial environment. The results of the spectrophotometer of the secondary silver solution with yellow color, showed maximum absorption at a wavelength of 400 mm, while the image of atomic force microscope (AFM) showed the hierarchical morphology shape of the prepared Silver nanoparticles with an average size of (10- 30 nm). Silver secondary particles were estimated with a diameter ranging from (12- 60 nm) and with good dispersion in water by ZetaSizer device. The results illustrated that the number of Promastigotes of the Leishmania parasite decreased after adding the Silver nanoparticles AgNPs in varying proportions, as the concentration of 500 μg/ml had the highest effect after 72 hours from incubation, and the percentage of remaining parasites was 5.2% comparing with the control percentage of 14.99%, while the value of IC50 was 253.075 μg/ml, The value of R2 = 0.8809, slope = 0.0478 after 24 hours from incubation.

Green Synthesis of Silver Nanoparticles using Ajuga parviflora Benth and Digera muricata Leaf extract: Their Characterization and Antimicrobial Activity

2020 ◽  
Vol 71 (10) ◽  
pp. 50-57
Author(s):  
Kamran Mehdi ◽  
Wajid Rehman ◽  
Obaid-Ur-rahman Abid ◽  
Srosh Fazil ◽  
Muhammad Sajid ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
State Of The Art ◽  
Sem Analysis ◽  
Bacterial Strains ◽  
Transmission Electron ◽  
Protein Amino Acids ◽  
Uv Visible ◽  
Average Size

The aim of the present study is to search out nontoxic silver nanoparticles synthesized from the leaf extract of two plants Ajuga parviflora Benth and Digera muricata for antimicrobial activity. The plants used in this investigation are rich in alkaloids, flavonoids, steroids, terpenoids, protein, amino acids, carbohydrate, quninones, phenols and tannins. The formation of nanoparticles were confirmed by UV/Visible spectroscopy, peaks at 423nm for Ajuga parviflora Benth and 408nm for Digera muricata. The morphology of the silver nanoparticles was established through state of the art spectroscopic tools. SEM analysis reveals average size of AgNPs 18 nm for Digera muricata and 22 nm for Ajuga parviflora Benth respectively while transmission electron microscopy confirms that AgNPs are spherical in shape. The synthesized nanoparticles were subjected to Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Pseudomonas aeruginosa. The results suggest that the silver nanoparticles have promising activity against all the bacterial strains and can be used an effective bactericides.

Facile synthesis of luminescent silver nanoparticles and fluorescence interactions with blue-emitting polyarylene ether nitrile

2015 ◽  
Vol 3 (15) ◽  
pp. 3522-3529 ◽  
Author(s):  
Kun Jia ◽  
Pan Wang ◽  
Liting Yuan ◽  
Xuefei Zhou ◽  
Wenjin Chen ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Organic Phase ◽  
Facile Synthesis ◽  
Polyarylene Ether Nitrile ◽  
One Step ◽  
Average Size

In this work, fluorescent silver nanoparticles with average size of 6 nm were synthesized in an organic phase via a facile one-step reaction.

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