Shape and size dependence of the surface plasmon resonance of gold nanoparticles studied by Photoacoustic technique

El‐Brolossy, T. A.; Abdallah, T.; Mohamed, Mona; Abdallah, Said; Easawi, K.; Negm, S.; Talaat, Mohamed

doi:10.1140/epjst/e2008-00462-0

Cited by 233 publications

(160 citation statements)

References 11 publications

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“…Appearance of specific colour during synthesis was due to excitation of surface plasmon resonance of GNP. With increase in incubation time, the reduction of HAuCl 4 into GNP was evident from change in the reaction mixture colour and appearance of GNP characteristic absorbance peak at $550 nm [33]. The involvement of biochemical constituents such as redox species, capping agents and surfactants of plant extracts has been documented earlier for metallic nanoparticle synthesis and for their size and shape control [20,21].…”

Section: Kinetics Of Gnp Synthesismentioning

confidence: 83%

Characterisation of gold nanoparticles synthesised by leaf and seed extract ofSyzygium cuminiL.

Kumar

Yadav

2012

Journal of Experimental Nanoscience

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Here, Syzygium cumini leaf extract (LE) and seed extract (SE) were explored for the synthesis of gold nanoparticles (GNP). LE and SE as well as their polar (water) fractions showed potential for GNP synthesis. Comparative synthesis kinetics and morphological characterisation studies revealed the synthesis of smaller sized GNP by LE than SE. Only polar (water) fractions showed potential for GNP synthesis, which are smaller in size compared to their respective extracts. SE contained more polyphenols and biochemical constituents than LE and therefore, showed higher synthesis rate and bigger sized GNP. Atomic force microscope and scanning electron microscope analysis indicated that both extracts and their fractions catalysed the synthesis of spherical GNP. The average size of GNP synthesised by LE, leaf water fraction (LWF), SE and seed water fraction (SWF) were 24, 23, 35 and 32 nm, respectively. Fourier transform infrared analysis identified the biomolecules involved in the synthesis and stability of GNP. This study documented the potential of S. cumini for the synthesis of GNP in addition to silver nanoparticles (SNP). However, nature and types of polyphenols involved in GNP synthesis seem to be different from that involved in SNP synthesis. This might be the possible reason for smaller sized GNP that SNP.

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Section: Kinetics Of Gnp Synthesismentioning

confidence: 83%

Characterisation of gold nanoparticles synthesised by leaf and seed extract ofSyzygium cuminiL.

Kumar

Yadav

2012

Journal of Experimental Nanoscience

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“…The Au-functionalised WO 3 films show an additional absorbance at 585 nm, corresponding to the surface plasmon resonance (SPR) peak of gold nanoparticles (El-Brolossy et al, 2008). Increasing the amount of gold precursor led to an increase in the absorbance of the gold plasmon resonance peak, suggesting a greater incorporation of gold particles.…”

Section: Resultsmentioning

confidence: 99%

Aerosol-assisted CVD synthesis, characterisation and gas-sensing application of gold-functionalised tungsten oxide

Maggio

Ling

Tsang

et al. 2014

J. Sens. Sens. Syst.

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Abstract. Tungsten oxide nanoneedles (NNs) functionalised with gold nanoparticles (NPs) have been integrated with alumina gas-sensor platforms using a simple and effective co-deposition method via aerosol-assisted chemical vapour deposition (AACVD) utilising a novel gold precursor, (NH 4 )AuCl 4 . The gas-sensing results show that gold NP functionalisation of tungsten oxide NNs improves the sensitivity of response to ethanol, with sensitivity increasing and response time decreasing with increasing amount of gold.

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“…Thus, the optical features to particle size shape and chemical environment is directly dependent on nanoparticles SPRs, charge distribution, and the dielectric environment. When excited, the SPRs of gold nanoparticles could scatter and/or absorb light in the visible or the near-infrared spectrum [42], an extremely useful and exploitable property for in vivo optical imaging techniques such as photoacoustic [43] and photon luminescence imaging [44]. The SDS protein profiling revealed that the bands corresponding to 42 and 50 kD in lane 1 gradually declined in lane 2 and almost disappeared in lane 3.…”

Section: Discussionmentioning

confidence: 99%

Biogenic gold nanotriangles from Saccharomonospora sp., an endophytic actinomycetes of Azadirachta indica A. Juss.

et al. 2013

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Microbial biofabrication is emerging as eco-friendly, simpler, and reproducible alternative to chemical synthesis of metals and semiconductor nanoparticles, allowing generation of rare geometrical forms such as nanotriangles and nanoprisms. Highly confined nanostructures like triangles/prisms are interesting class of nanoparticles due to their unique optical properties exploitable in biomedical diagnostics and biosensors. Here, we report for the first time a single-step biological protocol for the synthesis of gold nanotriangles using extract of endophytic actinomycetes Saccharomonospora sp., isolated from surface sterilized root tissues of Azadirachta indica A. Juss., when incubated with an aqueous solution of chloroaurate ions (AuCl − 4 /1 mM). Thin, flat occasionally prismatic gold nanotriangles were produced when aqueous chloroaurate ions reacted with the cell-free extract as well as with the biomass of endophytic Saccharomonospora. It was evidenced from sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis that proteins of 42 and 50 kD were involved in biosynthesis as well as in stabilization of the nanoparticles. The particle growth process was monitored by UV-vis spectroscopy, and the morphological characterization was carried out by transmission electron microscopy and atomic force microscopy together with X-ray powder diffractions. Although the exact mechanism for this shape-oriented synthesis is not clear so far, the possibility of achieving nanoparticle shape control in a microbial system is exciting.

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Shape and size dependence of the surface plasmon resonance of gold nanoparticles studied by Photoacoustic technique

Cited by 233 publications

References 11 publications

Characterisation of gold nanoparticles synthesised by leaf and seed extract ofSyzygium cuminiL.

Characterisation of gold nanoparticles synthesised by leaf and seed extract ofSyzygium cuminiL.

Aerosol-assisted CVD synthesis, characterisation and gas-sensing application of gold-functionalised tungsten oxide

Biogenic gold nanotriangles from Saccharomonospora sp., an endophytic actinomycetes of Azadirachta indica A. Juss.

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