Synthesis and Characterization of Silver Nanoparticles for an Undergraduate Laboratory

Orbaek, Alvin W.; McHale, Mary M.; Barron, Andrew R.

doi:10.1021/ed500036b

Cited by 47 publications

(53 citation statements)

References 18 publications

(28 reference statements)

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“…This thin layer of alumina is only a few nanometers, as shown in [ 29 ], and would not affect the optical properties of the Al NPs much. For the purpose of comparison, we also synthesized 100-nm Ag NPs by the NaBH 4 reduction of silver nitrate solution [ 39 ]. A 5-mL deionized water solution with 5 mM AgNO 3 and 5 mM sodium citrate were prepared.…”

Section: Methodsmentioning

confidence: 99%

Ultraviolet Plasmonic Aluminium Nanoparticles for Highly Efficient Light Incoupling on Silicon Solar Cells

2016

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Plasmonic metal nanoparticles supporting localized surface plasmon resonances have attracted a great deal of interest in boosting the light absorption in solar cells. Among the various plasmonic materials, the aluminium nanoparticles recently have become a rising star due to their unique ultraviolet plasmonic resonances, low cost, earth-abundance and high compatibility with the complementary metal-oxide semiconductor (CMOS) manufacturing process. Here, we report some key factors that determine the light incoupling of aluminium nanoparticles located on the front side of silicon solar cells. We first numerically study the scattering and absorption properties of the aluminium nanoparticles and the influence of the nanoparticle shape, size, surface coverage and the spacing layer on the light incoupling using the finite difference time domain method. Then, we experimentally integrate 100-nm aluminium nanoparticles on the front side of silicon solar cells with varying silicon nitride thicknesses. This study provides the fundamental insights for designing aluminium nanoparticle-based light trapping on solar cells.

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Section: Methodsmentioning

confidence: 99%

Ultraviolet Plasmonic Aluminium Nanoparticles for Highly Efficient Light Incoupling on Silicon Solar Cells

2016

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“…The solution was heated to 40 °C and stirred for 0.5 h. Honey yellow coloured silver nanoparticle and wine red coloured copper nanoparticle which are spherical and highly monodispersed were obtained respectively. The nanoparticles in the suspensions are stored in N 2 for future use and they are characterized using HRTEM, SEM and EDX measurements [34][35][36][37][38][39][40][41][42][43][44][45].…”

Section: Synthesis Of Silver Nanoparticle and Copper Nanoparticlementioning

confidence: 99%

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

Vasumathi¹,

Santhanalakshmi²

2018

Asian J. Chem.

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INTRODUCTIONInvention of non-invasive in vivo biosensors is today's necessity in diagnostics, medical analysis and therapy [1,2]. Detection and estimation of sugars in biological systems attract the attention of medical engineers. When protein-carbohydrate interactions are studied and established in presence of silver and copper nanoparticles, new immunotherapeutic strategies may be discovered in the treatment of malignant diseases [3]. In this paper the studies on the interaction of silver nanoparticles (AgNP) and copper nanoparticles (CuNP) with milk protein, β-casein (BCA) is quantitatively described using fluorescence quenching measurements. The interaction studies between the protein and the nanoparticles (Pro-NP) are extensively studied in presence of various monosaccharide and disaccharide sugars like glucose, fructose, galactose, sucrose, maltose and lactose. The protein β-casein (BCA) exhibits a strong fluorescence emission, which is sensitive to active quenchers. Metal nanoparticles like copper nanoparticles and silver nanoparticles with enhanced and unique properties are reported to quench protein fluorescence appreciably. In the present work, the fluorescence quenching effects of metal nanoparticles on the protein fluorescence are extensively studied in presence of various sugar molecules. This may play a significant role in the sensing applications of sugar molecular systems in the presence of metal nanoparticles. β-Casein is used as fluorophore and sugar molecular systems like sucrose, maltose, fructose, lactose, galactose and glucose are chosen as quenchers and the protein-sugar interactions are arrived from fluorescence quenching results in the presence of copper nanoparticles and silver nanoparticles. To find the role of life time on the intensity of fluorescence, time resolved fluorescence measurements for the protein-sugar systems in the presence and absence of nanoparticles is measured. The proteinnanoparticles-sugar fluorescence interactions are analyzed by using Stern-Volmer plots and thermodynamic plots using fluorescence intensity quenching data. The trends in the extent of quenching action on protein fluorescence and also the binding interactions among protein sugar systems are quantified in the presence of copper nanoparticles and silver nanoparticles separately, in terms of Stern-Volmer constant values and binding constants values. β-Casein is found to interact strongly with the quenchers in the presence of copper nanoparticle and silver nanoparticle. Silver nanoparticle is read to be a better quenching mediator than copper nanoparticle for the fluorescence intensity in molecular interactions. Order of sugars quenching the protein fluorescence in presence of the nanoparticles is found.

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“…Physical and chemical methods have usually been successful in the synthesis of nanomaterials in large quantities in short periods of time, as well for specific size and shape. However, most of these methods are extremely expensive and they also involve the use of toxic, hazardous chemicals as the stabilizers which may pose potential environmental and biological risks [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of silver nanoparticles using phlomis leaf extract and investigation of their antibacterial activity

et al. 2016

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In recent years, the green synthesis of silver nanoparticles using various plant extracts has attracted great attention. This is because, these methods are simple, inexpensive and, eco-friendly. In this study, it was observed that silver ions were reduced by phlomis leaf extract after 5 min, leading to the formation of crystalline silver nanoparticles. Phlomis species is known as a rich source of flavonoids, phenylpropanoids and other phenolic compounds. The silver nanoparticles produced by the phlomis extract were characterized by different techniques including UV-vis spectrophotometry, X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and FT-IR. The SEM and TEM results indicated that AgNPs were predominantly spherical in shape with an average particle size of 25 nm. In addition, the antibacterial activity of biologically synthesized nanopartilcles against Gram-positive (Staphyloccocus aureus and Bacillus cereus) and Gram-negative (Salmonella typhimurium and Escherichia coli) bacteria was proved. This study, therefore, showed that the phlomis leaf extract could be used for the green synthesis of silver nanoparticles with the appropriate antibacterial activity.

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Synthesis and Characterization of Silver Nanoparticles for an Undergraduate Laboratory

Cited by 47 publications

References 18 publications

Ultraviolet Plasmonic Aluminium Nanoparticles for Highly Efficient Light Incoupling on Silicon Solar Cells

Ultraviolet Plasmonic Aluminium Nanoparticles for Highly Efficient Light Incoupling on Silicon Solar Cells

Fluorescence Quenching of b-Casein by Silver Nanoparticles and Copper Nanoparticles in Presence of Sugars: A Quantitative Exploration

Green synthesis of silver nanoparticles using phlomis leaf extract and investigation of their antibacterial activity

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