scholarly journals Silver Nanoparticles as Optical Sensors

10.5772/8517 ◽  
2010 ◽  
Author(s):  
Chien Wang ◽  
Marta Luconi ◽  
Adriana Masi ◽  
Liliana Fernandez
Keyword(s):  
Silver Nanoparticles ◽  
Optical Sensors

scholarly journals Silver Nanoparticles as Colorimetric Sensors for Water Pollutants

Chemosensors ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 26 ◽  
Author(s):  
Paolo Prosposito ◽  
Luca Burratti ◽  
Iole Venditti
Keyword(s):  
Heavy Metals ◽  
Silver Nanoparticles ◽  
Human Health ◽  
Optical Sensors ◽  
Short Term ◽  
Water Pollutants ◽  
Silver Nanomaterials ◽  
Nanoparticles Synthesis ◽  
Heavy Metals Ions ◽  
Colorimetric Sensors

This review provides an up-to-date overview on silver nanoparticles-based materials suitable as optical sensors for water pollutants. The topic is really hot considering the implications for human health and environment due to water pollutants. In fact, the pollutants present in the water disturb the spontaneity of life-related mechanisms, such as the synthesis of cellular constituents and the transport of nutrients into cells, and this causes long / short-term diseases. For this reason, research continuously tends to develop always innovative, selective and efficient processes / technologies to remove pollutants from water. In this paper we will report on the silver nanoparticles synthesis, paying attention to the stabilizers and mostly used ligands, to the characterizations, to the properties and applications as colorimetric sensors for water pollutants. As water pollutants our attention will be focused on several heavy metals ions, such as Hg(II), Ni(II),Cu(II), Fe(III), Mn(II), Cr(III/V) Co(II) Cd(II), Pb(II), due to their dangerous effects on human health. In addition, several systems based on silver nanoparticles employed as pesticides colorimetric sensors in water will be also discussed. All of this with the aim to provide to readers a guide about recent advanced silver nanomaterials, used as colorimetric sensors in water.

Green Synthesis of Biopolymer-Silver Nanocomposites for Gas Sensing

2016 ◽  
Vol 99 ◽  
pp. 54-60 ◽  
Author(s):  
Shilpa A. Pande
Keyword(s):  
Silver Nanoparticles ◽  
Optical Sensors ◽  
Gas Sensing ◽  
Low Cost ◽  
Research Work ◽  
Trisodium Citrate ◽  
Nanocomposite Films ◽  
Sem Images ◽  
Natural Polysaccharide ◽  
Vis Spectroscopy

In this research work, a very simple, low cost eco-friendly method is presented for the synthesis of silver nanoparticles to be used in colorimetric optical sensors based on localized SPR (LSPR) measurement for gas ammonia. Silver nitrate salts are reduced using gaur gum which acts as a capping and reducing agent. Commonly used reducing agents such as trisodium citrate or sodium borohydride are replaced by a more environmental friendly natural polysaccharide. Nanocomposite films of ~ 1.5 μm thicknesses were fabricated using Gaur Gum and silver nanoparticles. The uniformity of nanoparticles size was measured by SEM and TEM, while face centred cubic structure of crystalline silver nanoparticles was characterized using the X-ray diffraction technique. The optical properties of the composite film were tested by UV-VIS Spectroscopy. The formation of Gaur Gum/silver nanocomposite films was confirmed using SEM images. Also the resistivity of nanocomposite thin film was measured which could be then used for gas sensing application.

scholarly journals Recent Advances in (Bio)Chemical Sensors for Food Safety and Quality Based on Silver Nanomaterials

2021 ◽  
Vol 59 (2) ◽  
Author(s):  
Irena Ivanišević ◽  
Stjepan Milardović ◽  
Petar Kassal
Keyword(s):  
Silver Nanoparticles ◽  
Food Safety ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Academic Research ◽  
Vital Role ◽  
Special Focus ◽  
Food And Beverage ◽  
The Cost ◽  
Food Safety And Quality

There is a continuing need for tools and devices which can simplify, quicken and reduce the cost of analyses of food safety and quality. Chemical sensors and biosensors are increasingly being developed for this purpose, reaping from the opportunities provided by nanotechnology. Due to the distinct electrical and optical properties of silver nanoparticles (AgNPs), this material plays a vital role in (bio)sensor development. This review is an analysis of chemical sensors and biosensors based on silver nanoparticles with application in food and beverage matrices. It consists of academic research published from 2015 to 2020. The paper is structured to separately explore the designs of two major (bio)sensor classes: electrochemical (including voltammetric and impedimetric sensors) and optical sensors (including colorimetric and luminescent), with special focus on the type of silver nanomaterial and its role in the sensor system. The review indicates that diverse nanosensors have been developed, capable of detecting analytes such as pesticides, mycotoxins, fertilizers, microorganisms, heavy metals, and various additives with exceptional analytical performance. Current trends in the design of such sensors are highlighted and challenges which need to be overcome in the future are discussed.

scholarly journals Single Silver Nanoparticles as Real-Time Optical Sensors with Zeptomole Sensitivity

Nano Letters ◽  
2003 ◽  
Vol 3 (8) ◽  
pp. 1057-1062 ◽  
Author(s):  
Adam D. McFarland ◽  
Richard P. Van Duyne
Keyword(s):  
Silver Nanoparticles ◽  
Real Time ◽  
Optical Sensors

Comparison of two devices for measuring exercise transcutaneous oxygen pressures in patients with claudication

VASA ◽  
2015 ◽  
Vol 44 (5) ◽  
pp. 355-362 ◽  
Author(s):  
Marie Urban ◽  
Alban Fouasson-Chailloux ◽  
Isabelle Signolet ◽  
Christophe Colas Ribas ◽  
Mathieu Feuilloy ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Transcutaneous Oxygen ◽  
Starting Values ◽  
Two Systems ◽  
Transcutaneous Oxygen Pressure ◽  
New Sensors ◽  
Changes Over Time ◽  
Over Time

Abstract. Summary: Background: We aimed at estimating the agreement between the Medicap® (photo-optical) and Radiometer® (electro-chemical) sensors during exercise transcutaneous oxygen pressure (tcpO2) tests. Our hypothesis was that although absolute starting values (tcpO2rest: mean over 2 minutes) might be different, tcpO2-changes over time and the minimal value of the decrease from rest of oxygen pressure (DROPmin) results at exercise shall be concordant between the two systems. Patients and methods: Forty seven patients with arterial claudication (65 + / - 7 years) performed a treadmill test with 5 probes each of the electro-chemical and photo-optical devices simultaneously, one of each system on the chest, on each buttock and on each calf. Results: Seventeen Medicap® probes disconnected during the tests. tcpO2rest and DROPmin values were higher with Medicap® than with Radiometer®, by 13.7 + / - 17.1 mm Hg and 3.4 + / - 11.7 mm Hg, respectively. Despite the differences in absolute starting values, changes over time were similar between the two systems. The concordance between the two systems was approximately 70 % for classification of test results from DROPmin. Conclusions: Photo-optical sensors are promising alternatives to electro-chemical sensors for exercise oximetry, provided that miniaturisation and weight reduction of the new sensors are possible.

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