Highly Sensitive and Selective Pymetrozine Colorimetric Sensor Based on P-Aminobenzenesulfonic Acid Modified Ag NPs

2011 ◽  
Vol 117-119 ◽  
pp. 958-961 ◽  
Author(s):  
Jun Chen ◽  
Cai Xia Dong ◽  
Yi Jun Zhang ◽  
Xiao Mao Zhou ◽  
Lian Yang Bai
Keyword(s):  
Absorption Band ◽  
Surface Plasmon ◽  
Colorimetric Sensor ◽  
Ag Nps ◽  
Plasmon Absorption ◽  
Plasmon Absorption Band ◽  
Surface Plasmon Absorption ◽  
Transmission Electron ◽  
Highly Sensitive ◽  
Dark Green

This paper reports a novel colorimetric sensor for pymetrozine based on p-aminobenzenesulfonic acid functionalized silver nanoparticles (p-ABSA-modified Ag NPs), which were characterized by IR spectroscopy, ultraviolet–visible spectroscopy (UV–vis), and transmission electron microscopy (TEM). The newly synthesized p-ABSA-modified Ag NPs are yellow in color due to the intense surface plasmon absorption band centered at 400nm. In the presence of pymetrozine, the yellow p-ABSA-modified Ag NPs solution turns to dark green, with a dramatic surface plasmon absorption band centered at 660nm. Moreover, high selectivity for pymetrozine was approved by the comparative experiments with an absorption ratio of A660/A400 more than 0.7. This highly sensitive sensor allows a direct and rapid quantitative assay of pymetrozine with a colorimetric limited detection concentration of 0.01mg/L.

scholarly journals A teoria de Mie aplicada ao estudo da banda de absorção de plasmon de superfície de nanopartículas metálicas coloidais

2019 ◽  
Author(s):  
Carlos Rodolfo Bomfim Lopes Souza
Keyword(s):  
Absorption Band ◽  
Surface Plasmon ◽  
Plasmon Absorption ◽  
Plasmon Absorption Band ◽  
Surface Plasmon Absorption

Com o avanço na tecnologia de nanofabricação nas últimas duas décadas, os materiais nanoestruturados têm atraído a atenção de pesquisadores devido à suas propriedades físicas únicas, não presentes nos mesmos materiais em dimensões maiores. Tais materiais, em especial as nanopartículas, apresentam aplicações nos mais diversos campos de interesse da indústria, como na fabricação de dispositivos optoeletrônicos (Shirasaki et al., 2013). Nanopartículas de prata apresentam uma faixa de absorção intensa na região UV-Vis conhecida com banda de absorção de plásmon de superfície (SPAB, do inglês surface plasmon absorption band), que ocorre devido as oscilações coletivas dos elétrons na superfície. Em particular, para aplicações em dispositivos optoeletrônicos, em fotônica e no campo emergente da plasmônica, é essencial saber o comportamento óptico das nanopartículas e conhecer a SPAB.A SPAB de nanopartículas metálicas pode ser obtida pelo método de Mie (Mie, 1908), aplicado com sucesso ao estudo de nanopartículas de prata e ouro. Nessa teoria, a SPAB de nanopartículas esféricas são obtidas através do cálculo da seção de choque de extinção ou eficiência de extinção de nanopartícuas. Neste contexto, o objetivo principal deste trabalho é calcular a banda de absorção de plasmon de superfícies de nanopartículas de prata usando a soma completa da série de Mie para a seção de choque de extinção de partículas de prata esféricas numa gama de raios de 1 a 17 nm e simular o comportamento dessa banda.

scholarly journals Synthesis of One Dimensional Gold Nanostructures

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Hongchen Li ◽  
Caixia Kan ◽  
Zhaoguang Yi ◽  
Xiaolong Ding ◽  
Yanli Cao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Absorption Band ◽  
Gold Nanostructures ◽  
Ph Change ◽  
Plasmon Absorption ◽  
Au Nanorods ◽  
Plasmon Absorption Band ◽  
Transmission Electron ◽  
Slow Kinetics

Gold nanostructures with shapes of rod, dumbbells, and dog bone have been fabricated by an improved seed-mediated method. It is found that the pH change (the addition of HNO3or HCl) and the presence of Ag+ions have a great influence on the growth process and aspect ratios of these Au nanocrystals. UV-Vis-NIR absorption spectra for the Au colloidal show that the transverse plasmon absorption band locates at ~520 nm, while the longitudinal plasmon absorption band shifts in a wide spectra region of 750–1100 nm. The obtained Au nanostructures have been investigated by transmission electron microscopy, high-resolution transmission electron microscopy, and X-ray diffractometer. Based on the characterizations and FDTD simulations, most of the obtained Au nanorods are single crystals, possessing an octagonal cross-section bounded by and faces. One model for the anisotropic growth has been proposed. It is found that slow kinetics favor the formation of single-crystalline Au nanorods.

Controlling the Surface Plasmon Absorption of Silver Nanoparticles via Green Synthesis Using Pennisetum purpureum Leaf Extract

2018 ◽  
Vol 772 ◽  
pp. 73-77
Author(s):  
Ruelson S. Solidum ◽  
Arnold C. Alguno ◽  
Rey Capangpangan
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Silver Nitrate ◽  
Surface Plasmon ◽  
Leaf Extract ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Absorption Peak ◽  
Plasmon Absorption ◽  
Surface Plasmon Absorption

We report on the green synthesis of silver nanoparticles utilizing theP.purpureumleaf extract. Controlling the surface plasmon absorption of silver nanoparticles was achieved by regulating the amount of extract concentration and the molarity of silver nitrate solution. The surface plasmon absorption peak is found at around 430nm. The surface plasmon absorption peak have shifted to lower wavelength as the amount of extract is increased, while plasmon absorption peak shifts on a higher wavelength as the concentration of silver nitrate is increased before it stabilized at 430nm. This can be explained in terms of the available nucleation sites promoted by the plant extract as well as the available silver ions present in silver nitrate solution.

Synthesis of Gold Nanoparticles by Laser Ablation in Toluene:  Quenching and Recovery of the Surface Plasmon Absorption

2005 ◽  
Vol 109 (49) ◽  
pp. 23125-23128 ◽  
Author(s):  
Vincenzo Amendola ◽  
Gian Andrea Rizzi ◽  
Stefano Polizzi ◽  
Moreno Meneghetti
Keyword(s):  
Gold Nanoparticles ◽  
Laser Ablation ◽  
Surface Plasmon ◽  
Plasmon Absorption ◽  
Surface Plasmon Absorption
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