Controlling the Optical Properties of Lemongrass Extract Synthesized Gold Nanotriangles and Potential Application in Infrared-Absorbing Optical Coatings

Shankar, S. Shiv; Rai, Akhilesh; Ahmad, and Absar; Sastry, Murali

doi:10.1021/cm048292g

Cited by 597 publications

(417 citation statements)

References 29 publications

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“…Recently, several plants extracts such as Annona squamosa [16], Arbutus unedo [17], Cassia angustifolia [18] and many others [19][20][21][22][23][24][25][26][27] have been used to synthesize silver (Ag) and gold (Au) nanoparticles (NPs). However, these natural sources, which have active ingredients, produce nanoparticles at slower rate.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

2015

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“…Jose-Yacaman and co-workers (Gardea-Torresdey et al 2002 first reported the formation gold and silver nanoparticles by living plants. Green silver nanoparticles have been synthesized using various natural products, such as green tea (Camellia sinensis) (Vilchis-Nestor et al 2008), neem (Azadirachta indica) leaf broth (Shiv Shankar et al 2004), natural rubber (Abu Bakar et al 2007), starch (Vigneshwaran et al 2006), aloevera plant extract (Chandran et al 2006), lemongrass leaves extract (Shankar et al , 2005 leguminous shrub (Sesbania drummondii) (Sharma et al 2007), mushroom extract (Philip 2009), Coleus amboinicus lour (Narayanan andSakthivel 2011), Medicago sativa (Lukman et al 2011), and Citrus sinensis peel (Kaviya et al 2011) to name few. Shankar et al (2004) and Shiv Shankar et al (2004) reported the metallic silver and gold nanoparticle synthesis by using Neem (Azadirachta indica) leaf broth.…”

Section: Introductionmentioning

confidence: 99%

Rapid detection of Cr(VI) by AgNPs probe produced by Anacardium occidentale fresh leaf extracts

Balavigneswaran¹,

Kumar²,

Packiaraj³

et al. 2013

Appl Nanosci

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Nowadays necessities for the green synthesis of nanoparticles are enlarged because of its neutral toxicity and eco-friendly advantages. In this present study, we have explored the rapid biosynthesis of AgNPs at room temperature by the fresh leaf aqueous extract of Anacardium occidentale. Aqueous extracts were prepared at different temperatures 60, 80 and 100°C. Formation of silver nanoparticles (AgNPs) was confirmed by surface plasmon resonance (SPR) peak observed around 400-420 nm in UV-Visible spectra. Among the extracts prepared, 80°C extract showed good shift in UV-Visible spectrum during Cr(VI) detection and a good linear relationship was found between the absorbance ratio (A 510 /A 400 ) against 100 mM-1 lM concentration of Cr(VI). Cr(VI) was confirmed by the red shift of SPR position from 400 to 510 nm. Detection limit of our prepared probe is 1 lM and this simple technique exhibiting high selectivity to Cr(VI) over other tested heavy metal ions. Finally, efficient 80°C extract synthesized AgNPs were characterized by XRD, SEM and TEM. XRD characterization confirmed its face centered cubic structure and confirmed that the prepared AgNPs are crystalline in nature. TEM and SEM characterization results revealed that the AgNPs are in spherical nature. The size of AgNPs was found to be 40-60 nm.

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“…The flower-shape gold nanoparticles are synthesized without the use of toxic chemicals and stabilizers. Literature survey revealed synthesis of biological triangular gold nanoprisms by the reduction of aqueous chloroaurate ions by extracts of Cymbopogon flexuosus in high yield at room temperature [35]. Tamarind leaf extract can also be used as the reducing agent for making gold nanotriangles [36].…”

Section: Tem Analysismentioning

confidence: 99%

Flower-shaped gold nanoparticles synthesized using Kedrostis foetidissima and their antiproliferative activity against bone cancer cell lines

Firdhouse

Pottail

2016

Int J Ind Chem

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Three different methods were employed for the synthesis of biogenic gold nanoparticles using the aqueous extracts of Kedrostis foetidissima. The interaction of gold nanoparticles with the phytoconstituents was investigated by FTIR. The complete reduction of chloroaurate ions to gold nanoparticles was monitored using UV-visible spectroscopy under the different plant extract concentration and conditions. The formation of gold nanoparticles was confirmed using XRD, SEM and TEM analysis. The anisotropic and flower-shaped gold nanoparticles of size below 25 nm was confirmed by TEM analysis. Cucurbitacins, the chief constituents of K. foetidissima probably might have interacted with the chloroaurate ions, facilitating the formation of gold nanoparticles. KFL-mediated AuNPs showed 88 % cell viability against bone cancer cell lines at 200 lg/ml concentration using MTT assay. This may be due to the formation of flower-shaped nature of KFL-mediated AuNPs. The novelty of the work lies in the plantmediated synthesis of biocompatible gold nanoparticles of size less than 25 nm showing 88 % of cell viability against bone cancer cell lines.

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Controlling the Optical Properties of Lemongrass Extract Synthesized Gold Nanotriangles and Potential Application in Infrared-Absorbing Optical Coatings

Cited by 597 publications

References 29 publications

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

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

Rapid detection of Cr(VI) by AgNPs probe produced by Anacardium occidentale fresh leaf extracts

Flower-shaped gold nanoparticles synthesized using Kedrostis foetidissima and their antiproliferative activity against bone cancer cell lines

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