Electrical transport studies of Ag nanoclusters embedded in glass matrix

Magudapathy, P.; Gangopadhyay, P.; Panigrahi, B. K.; Nair, K. G. M.; Dhara, Sandip

doi:10.1016/s0921-4526(00)00580-9

Cited by 378 publications

(169 citation statements)

References 12 publications

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“…Figure 6b showed the EDX profile with a strong Ag signal along with other peaks, which may be originated from biomolecules bounding to the surface of AgNPs. Metallic AgNPs generally show typical absorption peak approximately at 3 keV due to surface Plasmon resonance [34]. In addition, TEM micrograph shows fine configuration of crystalline, spherical AgNPs, with size slightly higher of that recorded in AFM and SEM assays, since it ranged between 27 and 49 nm (Fig.…”

Section: Resultsmentioning

confidence: 86%

Green-Synthesized Mosquito Oviposition Attractants and Ovicides: Towards a Nanoparticle-Based “Lure and Kill” Approach?

Benelli

Govindarajan

2016

J Clust Sci

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Mosquitoes are key vectors of malaria, dengue, yellow fever, chikungunya, West Nile, Japanese encephalitis, lymphatic filariasis, Zika virus and St. Louis encephalitis virus. Eco-friendly control tools of Culicidae vectors are a priority. Green nanotechnologies may help to boost the effectiveness of mosquito vector control. We proposed a facile fabrication of poly-disperse and stable silver nanoparticles (AgNPs) using the Aganosma cymosa leaf extract. Nanoparticles were characterized by UV-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction analysis, atomic force microscopy, scanning electron microscopy and transmission electron microscopy. Nanoparticles showed high toxicity on eggs and larvae of Anopheles stephensi, Aedes aegypti and Culex quinquefasciatus. LC 50 values were 12.45, 13.58 and 14.79 lg/mL, respectively. No egg hatchability was noted post-treatment with 40, 50 and 60 lg/mL, respectively. Nanoparticles were found safer to non-target mosquito predators Anisops bouvieri, Diplonychus indicus and Gambusia affinis, LC 50 values ranged from 673.36 to 2247.43 lg/mL. Notably, AgNPs showed high oviposition attractiveness towards the three mosquito species. Overall, the oviposition attractiveness of the A. cymosa extract coupled with the ovicidal action of AgNPs can help to develop ''lure and kill'' tools to be used at mosquito breeding sites.

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Section: Resultsmentioning

confidence: 86%

Green-Synthesized Mosquito Oviposition Attractants and Ovicides: Towards a Nanoparticle-Based “Lure and Kill” Approach?

Benelli

Govindarajan

2016

J Clust Sci

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“…7a) and 2 keV (Fig. 7b), which is typical for the absorption of metallic Ag [52] and Au [53] nanocrystallites, respectively. In addition to Ag and Au, peaks due to carbon and oxygen are also present, which further support the stabilization of nanoparticles by biomolecules.…”

Section: Edax Analysismentioning

confidence: 80%

Photobiological synthesis of noble metal nanoparticles using Hydrocotyle asiatica and application as catalyst for the photodegradation of cationic dyes

2015

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Solar light induced photo catalysis by plasmonic nanoparticles such as Au and Ag is an important field in green chemistry. In this study an environmental benign method was investigated for the rapid synthesis of colloidal Ag and AuNPs using the extract of Hydrocotyle asiatica, as a reducing and stabilizing agent under sunlight irradiation. The nanoparticles were formed in few seconds and were characterized by UV-Vis., FT-IR, TEM, EDAX, XRD, DLS and Zetasizer. The nanoparticles were stable in aqueous solution for more than 6 months. TEM analysis established that the Ag and AuNPs were predominantly spherical with average size of 21 and 8 nm, respectively. The flavonoids and glycosides from the extract of H. asiatica were proved to be responsible for the reduction and capping through FT-IR analysis. The antimicrobial studies of AgNPs showed effective inhibitory activity against the clinical strains of gram-negative and positive bacteria. The localized surface plasmon resonance of AgNPs was used for the photo-driven degradation of cationic dyes (malachite green and methylene blue). Thus, this green technique can be used for bulk production of AgNPs, and thus prepared nanoparticles may be used for removal of dyes from effluent. Graphical Abstract

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“…The peak is observed at 12.260 KeV, which is typical for the absorption of metallic SNPs [21]. Strong signals from the silver atoms are observed, while weaker signals from C atoms are also recorded.…”

Section: Resultsmentioning

confidence: 84%

Biosynthesis, characterization and antibacterial activity of silver nanoparticles from Aspergillus awamori

Vishwanatha¹,

Keshavamurthy²,

Mahanthappa³

et al. 2018

J App Biol Biotech

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Microbial nanoparticles (NPs) have become the subject of immense research interest in the recent past due to their wide range of applications as effective antimicrobial agents, drug delivery systems, gene delivery, diagnostic agents in imaging diseases, and consumer products among others. The present study emphasizes on the synthesis of metallic silver NPs (SNPs) from cell-free supernatant of Aspergillus awamori strain KGSR12. The phase purity, composition, size, and shape of the as-synthesized NPs were characterized using various analytic spectroscopic techniques including X-ray diffraction, scanning electron microscope (SEM), ultraviolet-visible, and Fourier transform-infrared spectroscopy. Based on the SEM analysis, the particles are uniformly distributed, and size is estimated to be 40-50 nm. Antibacterial activity of NPs against significant human pathogens was conferred with well diffusion assay, and it reveals the strains of Pseudomonas aeruginosa, Klebsiella pneumoniae, and Bacillus cereus are susceptible to synthesized SNPs that confirm the antibacterial activity of SNPs. Thus, the study concludes with the biogenic and eco-friendly route for synthesizing SNPs with antibacterial activity against clinically important pathogens and attributes growing interest on fungi as an emerging source for the synthesis of NPs.

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Electrical transport studies of Ag nanoclusters embedded in glass matrix

Cited by 378 publications

References 12 publications

Green-Synthesized Mosquito Oviposition Attractants and Ovicides: Towards a Nanoparticle-Based “Lure and Kill” Approach?

Green-Synthesized Mosquito Oviposition Attractants and Ovicides: Towards a Nanoparticle-Based “Lure and Kill” Approach?

Photobiological synthesis of noble metal nanoparticles using Hydrocotyle asiatica and application as catalyst for the photodegradation of cationic dyes

Biosynthesis, characterization and antibacterial activity of silver nanoparticles from Aspergillus awamori

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