Synthesis and spectral characterization of silver embedded chitosan matrix nanocomposite for the selective colorimetric sensing of toxic mercury

Nivethaa, E. A. K.; Narayanan, Vijaykrishnan

doi:10.1016/j.saa.2015.01.075

Cited by 38 publications

(12 citation statements)

References 38 publications

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“…Figure 11b shows three spin-orbit pairs of XPS signals for Ag3d5/2 and Ag3d3/2 energetic levels as a fitting of experimental curve. The main signals within Ag 3d peaks are located at 368.3 and 374.3 eV for Ag3d5/2B and Ag3d3/2B components and can be identified as metallic silver atoms in the bulk phase of silver nanoparticles (Kaushik 1991;Hoflund et al 2000;Bao et al 1996;Moulder et al 1992). The binding energy for another spin-orbit pair shifts towards lower binding energy values at the positions 367.7 and 373.7 eV for Ag3d5/2C and Ag3d3/2C lines, respectively, are attributed to the silver atoms bonding with oxygen suggesting the existence of silver(I) and silver(II) oxidation states in Ag 2 O (Weaver and Hoflund 1994) and AgO phase (Schon 1973) (confirmed also for oxygen atoms in Fig.…”

Section: Electron Spectroscopy For Chemical Analysis Of Silica/ Agnp mentioning

confidence: 99%

Silica nanocomposites based on silver nanoparticles-functionalization and pH effect

2018

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Current reports in the field of nanotechnology indicate that the properties of metal nanoparticles are determined by their features such as size, shape, composition as well as a degree of crystallinity and stability. These, in turn, may depend heavily on their preparation way, treatment during and after synthesis and finally on properties of the supports and matrices. The goal of presented work was to determine the shape, size, and distribution of silver nanoparticles depending on preparation conditions. In particular, the issues of the formation of silver nanostructures (AgNP) with various shapes and sizes depending on functionalized silica surface as well as on the conditions of the impregnation step by noble metal ions (especially pH) were considered. In particular, the comprehensive approach to determine the impact of pH conditions on the properties of metallic nanoparticles is laid down in this work. Three types of fumed silica materials were selected as the supports of silver nanostructures (Aerosil 150, Aerosil 300 and Silochrom C-120). Silica materials were chemically functionalized by thiol and amine groups and treated with diamminesilver(I) ions [Ag(NH 3 ) 2 ] + . As a result of their reduction silicas adorned with silver nanostructures were obtained. In this work, the AgNP in the form of very small nanoparticles, longitudinal and spherical forms and greater structures with nondescript shape were successfully received and characterized through changing the form of functional groups on the solid surface by adjusting the pH conditions. It turns out that protonation and deprotonation of thiol, amino, and hydroxyl groups can be responsible for possible interactions between noble metal ions and functional groups in the form of both attractive and repulsive electrostatic interactions. The Ag nanoparticle/silica nanocomposites were investigated by X-ray diffraction, atomic force microscopy, potentiometric titration and X-ray photoelectron spectroscopy.

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Section: Electron Spectroscopy For Chemical Analysis Of Silica/ Agnp mentioning

confidence: 99%

Silica nanocomposites based on silver nanoparticles-functionalization and pH effect

2018

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“…ACCEPTED MANUSCRIPT 15 phenomena related to a redox reaction between zero-valent silver and Hg 2+ with the standard potential of 0.8 V (Ag + /Ag) and 0.85 V (Hg 2+ /Hg) happened, leading to the formation of Ag−Hg nanoalloy [16,39]. This reversely changed the surface plasmon property of AgNPs and consequently the color of the solution changed.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Microwave-assisted ultrafast synthesis of silver nanoparticles for detection of Hg2+

Pang

Liu

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Nivethaa et al 236 synthesized polymer matrix based CH-Ag nanocomposites containing silver in various proportions of weight %. The study aimed to show that CH-Ag nanocomposites, whose matrix is an edible biopolymer, could be used as mercury (Hg) sensor.…”

Section: Chemistry Structure and Sensing Applicationsmentioning

confidence: 99%

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confidence: 99%

Chemistry, Structures, and Advanced Applications of Nanocomposites from Biorenewable Resources

et al. 2020

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Researchers have recently focused on the advancement of new materials from bio-renewable and sustainable sources because of the great concerns about environmental, waste accumulation and destruction, and the inevitable depletion of fossil resources. The bio-renewable-based materials have been extensively used as a matrix or reinforcement in many applications. In the development of innovative methods and materials, composites offer important advantages because of their excellent properties such as ease of fabrication, higher mechanical properties, high thermal stability, and many more. Especially, the nanocomposites (obtained by using biorenewable sources) have significant advantages when compared to conventional composites.The nanocomposites have been utilized in many applications ranging from food, biomedical, electroanalysis, energy storage, wastewater treatment, automotive etc. This comprehensive review provides chemistry, structures, advanced applications and recent developments about nanocomposites obtained from bio-renewable sources.

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Synthesis and spectral characterization of silver embedded chitosan matrix nanocomposite for the selective colorimetric sensing of toxic mercury

Cited by 38 publications

References 38 publications

Silica nanocomposites based on silver nanoparticles-functionalization and pH effect

Silica nanocomposites based on silver nanoparticles-functionalization and pH effect

Microwave-assisted ultrafast synthesis of silver nanoparticles for detection of Hg2+

Chemistry, Structures, and Advanced Applications of Nanocomposites from Biorenewable Resources

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