Electronic structure of gold nanoparticles deposited on SiOx/Si(100)

Petö, G.; Molnár, György; Pászti, Zoltán; Geszti, O.; Beck, A.; Guczi, L.

doi:10.1016/s0928-4931(01)00449-0

Cited by 132 publications

(84 citation statements)

References 13 publications

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“…Nanoparticles have incredible importance due to their unusual optical (Krolikowska et al, 2003), chemical (Kumar et al, 2003), photoelectrochemical (Chandrasekharan & Kamat, 2000) and electronic (Peto et al, 2002) properties. The optoelectronic and physicochemical properties of nanoparticles are strongly dependent on particle size (Alivisatos, 1996).…”

Section: Introductionmentioning

confidence: 99%

Screening of different algae for green synthesis of gold nanoparticles

Parial

Patra

Dasgupta

et al. 2012

European Journal of Phycology

168

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The cyanobacteria Phormidium valderianum, P. tenue and Microcoleus chthonoplastes and the green algae Rhizoclonium fontinale, Ulva intestinalis, Chara zeylanica and Pithophora oedogoniana were exposed to hydrogen tetrachloroaurate solution and were screened for their suitability for producing nano-gold. All three cyanobacteria genera and two of the green algae (Rhizoclonium fontinale and Ulva intestinalis) produced gold nanoparticles intracellularly, confirmed by purple colouration of the thallus within 72 h of treatment at 20 C. Extracted nanoparticle solutions were examined by UV-vis spectroscopy, transmission electron microscopy (TEM) and X-ray diffractometry (XRD). XRD confirmed the reduction of Au (III) to Au (0). UV-vis spectroscopy and TEM studies indicated the production of nanoparticles having different shapes and sizes. Phormidium valderianum synthesized mostly spherical nanoparticles, along with hexagonal and triangular nanoparticles, at basic and neutral pHs (pH 9 and pH 7, respectively). Medicinally important gold nanorods were synthesized (together with gold nanospheres) only by P. valderianum at acidic pH (pH 5); this was initially determined by two surface plasmon bands in UV-vis spectroscopy and later confirmed by TEM. Spherical to somewhat irregular particles were produced by P. tenue and Ulva intestinalis (TEM studies). The UV-vis spectroscopy of the supernatant of other algal extracts indicated the formation of mostly spherical particles. Production of gold nanoparticles by algae is more ecofriendly than purely chemical synthesis. However, the choice of algae is important: Chara zeylanica and Pithophora oedogoniana were found to be unable to produce nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Screening of different algae for green synthesis of gold nanoparticles

Parial

Patra

Dasgupta

et al. 2012

European Journal of Phycology

168

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“…Metal nanoparticles have attracted a great deal of attention in recent years due to their unique optical, 1 electrochemical, 2 and electronic 3 properties. In particular, noble metal colloids, especially those of silver and gold, have a variety of applications in catalysis, 4 nonlinear optics, 5 medicine, 6 microscopy, 7 and surface-enhanced Raman scattering (SERS).…”

Section: Introductionmentioning

confidence: 99%

SERS of plant material

Zeiri

2007

J Raman Spectroscopy

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Colloidal gold and silver were formed by the spontaneous reduction of metal salts by plant tissue -alfalfa seeds, green tea leaves, carrots and red cabbage. The colloids were analyzed using electron microscopy and spectroscopic tools. The reduction process yielded stable gold colloids, but for silver the colloidal particles were bigger and less stable, tending to form aggregates. The formation of metal colloids enabled surface-enhanced Raman spectra (SERS) measurements, yielding specific vibrational signatures for the plant components in the proximity of the colloids. The main SERS peaks were attributed to nicotinamide adenine dinucleotide (NAD) and other adenine-containing materials. Other peaks were assigned to flavins [e.g. flavin adenine dinucleotide (FAD)], chlorophyll, lipids and other biocomponents. Since the SERS spectra did not show any antioxidants common to all four different types of plant tissue, it is proposed that NAD and FAD compounds that play an important role in the respiration process may be involved in the metal reduction process.

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“…Inorganic nano materials are gaining attention due to their novel and size-related physico-chemical properties as compared to bulk matter [1]. Due to their these novel properties of nano materials, they have been used in a wide range of potential applications in medicine, cosmetics, catalyst, renewable energy and biomedical devices [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Toxic Textile Dyes using Silver Nanocomposites

Khatoon¹,

Sardar²

2017

J Nanosci Curr Res

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In the present study biomimetic synthesis of silver nanoparticles using Solanum nigrum and Cannabis sativa were explored. The biosynthesized silver nanocomposites were characterized using UV-VIS spectroscopy, DLS, TEM, FTIR and XRD. The characteristic surface plasmon resonance of Solanum nigrum and Cannabis sativa were recorded at 430 and 445 nm respectively. The average diameter of silver nanocomposites were 34.13 ± 3.10 and 70.93 ± 3.57 nm for Solanum nigrum and Cannabis sativa leaf extract respectively. The release of textile dyes into our surrounding water bodies has toxic effect on human health and marine life therefore removal of these dyes is necessary to protect environment. The nanotechnology has provided a new platform for waste water treatment. Hence the biosynthesized nanocomposites were employed for dye removal from wastewater. The effects of various parameters, such as time of incubation, concentration, pH, and temperature, were studied. The biosynthesized silver nanoparticles are most effective in dye removal at alkaline pH 9 and at 60ºC. The textile industry effluents have high pH and temperature which makes these nanoparticles more appropriate in treatment of these industry effluents. To elucidate the reusability, the decolorizing efficiency of biosynthesized silver nanocomposites were investigated upto 3 cycles.

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Electronic structure of gold nanoparticles deposited on SiOx/Si(100)

Cited by 132 publications

References 13 publications

Screening of different algae for green synthesis of gold nanoparticles

Screening of different algae for green synthesis of gold nanoparticles

SERS of plant material

Efficient Removal of Toxic Textile Dyes using Silver Nanocomposites

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