Journal ArticleDOI
Starch-mediated shape-selective synthesis of Au nanoparticles with tunable longitudinal plasmon resonance.
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The starch-stabilized nanoparticles could be precipitated from the solution by a starch digesting enzyme which also binds with the particles resulting in its precipitation and the change in shape from spherical to triangular to hexagonal particles with increasing initial HAuC14 concentration was revealed.Abstract:
We report the synthesis ofAu nanoparticles, with tunable longitudinal plasmon band and shape selectivity, mediated by starch in the presence of ultrasonic waves. The synthesis was carried out by reduction of HAuCl4, at various concentrations, using H2O2 as the reducing agent. When the reactions were carried out in the absence of ultrasonic waves, there was no occurrence of the longitudinal resonance band, while the transverse plasmon resonance band shifted toward a higher wavelength. Transmission electron microscopic measurements revealed an increase in particle sizes with increasing higher initial HAuCl4 concentration. On the other hand, in the presence of ultrasonic waves, as the initial concentration of HAuCl4 was increased, while the transverse plasmon resonance band remained the same, the longitudinal plasmon resonance band increasingly shifted toward a higher wavelength. Transmission electron microscopic measurements revealed the change in shape from spherical to triangular to hexagonal particles with increasing initial HAuC14 concentration. We also report that the starch-stabilized nanoparticles could be precipitated from the solution by a starch digesting enzyme which also binds with the particles resulting in its precipitation.read more
Citations
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Synthesis of gold nanotriangles and silver nanoparticles using Aloe vera plant extract.
TL;DR: It is observed that the slow rate of the reaction along with the shape directing effect of the constituents of the extract are responsible for the formation of single crystalline gold nanotriangles.
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Gold Nanomaterials at Work in Biomedicine
Journal ArticleDOI
Biofabrication with chitosan.
Hyunmin Yi,Li-Qun Wu,William E. Bentley,Reza Ghodssi,Gary W. Rubloff,James N. Culver,Gregory F. Payne +6 more
TL;DR: The traditional motivation for integrating biological components into microfabricated devices has been to create biosensors that meld the molecular recognition capabilities of biology with the signal processing capabilities of electronic devices, but a different motivation is emerging; biological components are being explored to radically change how fabrication is achieved at the micro- and nanoscales.
Journal ArticleDOI
Biomimetic and Bioinspired Synthesis of Nanomaterials/Nanostructures.
Guangtao Zan,Qingsheng Wu +1 more
TL;DR: This review examines the biomimetic and bioinspired synthesis of nanomaterials/nanostructures from five perspectives and discusses the synthesis procedures, basic principles, and relationships of these systems from the following five perspectives.
Journal ArticleDOI
Synthesis of starch-stabilized silver nanoparticles and their application as a surface plasmon resonance-based sensor of hydrogen peroxide
TL;DR: In this paper, a plasmon resonance-based optical sensor for hydrogen peroxide detection is presented. But the sensitivity of this sensor is limited to 0.9μm H 2 O 2, which is lower than certain enzyme-based biosensors.
References
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Journal ArticleDOI
Semiconductor Clusters, Nanocrystals, and Quantum Dots
TL;DR: In this article, the authors focus on the properties of quantum dots and their ability to join the dots into complex assemblies creates many opportunities for scientific discovery, such as the ability of joining the dots to complex assemblies.
Journal ArticleDOI
Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering
Shuming Nie,Steven R. Emory +1 more
TL;DR: In this article, surface-enhanced Raman scattering was used to detect single molecules and single nanoparticles at room temperature with the use of surface enhanced Raman, and the intrinsic Raman enhancement factors were on the order of 10 14 to 10 15, much larger than the ensemble-averaged values derived from conventional measurements.
Journal ArticleDOI
Shape-Controlled Synthesis of Gold and Silver Nanoparticles
Yugang Sun,Younan Xia +1 more
TL;DR: Monodisperse samples of silver nanocubes were synthesized in large quantities by reducing silver nitrate with ethylene glycol in the presence of poly(vinyl pyrrolidone) (PVP), characterized by a slightly truncated shape bounded by {100, {110}, and {111} facets.
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Photoinduced conversion of silver nanospheres to nanoprisms.
TL;DR: This light-driven process results in a colloid with distinctive optical properties that directly relate to the nanoprism shape of the particles, which could be useful in developing multicolor diagnostic labels on the basis of nanoparticle composition and size but also of shape.
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Some interesting properties of metals confined in time and nanometer space of different shapes.
TL;DR: Some of the observed new chemical, optical, and thermal properties of metallic nanocrystals when their size is confined to the nanometer length scale and their dynamical processes are observed on the femto- to picosecond time scale are described.