Silver Nanoshells:  Variations in Morphologies and Optical Properties

and, J. B. Jackson; Halas, Naomi J.

doi:10.1021/jp003868k

Cited by 486 publications

(406 citation statements)

References 22 publications

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“…Clearly, however, the curvature of 110-nm spheres does not result in simple polystyrene core/Ag shell structures. 19 Consistent with Mie theory, 20 spherical Ag nanoparticles in DMF exhibit a single-surface plasmon resonance centered at 415 nm. The Ag nanodisks presented here exhibit optical properties that are remarkably different from those of spherical Ag nanoparticles.…”

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confidence: 60%

Synthesis of Silver Nanodisks Using Polystyrene Mesospheres as Templates

et al. 2002

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The remarkable size and shape dependence of physical, optical, and electronic properties of metal and semiconductor nanocrystals make them compelling components of modern materials chemistry. [1][2][3] When spherical metal particles are transformed into nanoscale rods or triangular prisms, the surface plasmon resonances are strongly affected, typically red-shifting and even splitting into distinctive dipole and quadrupole plasmon modes. 4 Colloid chemists have recently made much progress in preparing monodispersed spherical nanocrystals via ambient temperature wet-chemical routes or organometallic methods. 2 Although the synthesis of spherical nanocrystals is well developed for many materials, systematic manipulation of the shapes of nanocrystals is a significant challenge. Recent work devoted to making nonspherical nanocrystals via anisotropic inorganic nanocrystal growth in liquid media (including electrochemical growth) has yielded Au rods, 5 BaCrO 4 rods, 6 TiO 2 rods, 7 Ag rods, 8 Pt cubes and pyramids, 9 and rod-, arrow-, teardrop-, and tetrapod-shaped CdSe nanocrystals. 10,11 Fabrication of these materials is useful not only for understanding fundamental phenomena such as quantum confinement but also for obtaining "building blocks" featuring optical and electronic properties that are desirable for advanced applications in photovoltaic solar cells, light-emitting diodes, and biological diagnostics. 4,12,13 In contrast to nanorods, nanodisks and nanoprisms such as triangles are less well-known. Although a few strategies do exist for synthesizing Co disks, 14 Ag disks, 15 and Ag triangle nanoprisms, 4,16 there is great interest in developing new methods for making nanoparticles with control over shape and size. Herein, we report a new synthesis of disk-shaped Ag nanoparticles using polystyrene spheres as templates.An aqueous colloidal suspension of carboxylate-functionalized polystyrene (PS) spheres was purchased from Interfacial Dynamics Corporation. Fresh Ag solution containing 10 wt % AgNO 3 and 6% ammonium hydroxide was prepared. Briefly, 160 µL of 110-nm diameter PS spheres and 75 µL of Ag solution were added to 60 mL of somewhat aged N,N-dimethylformamide (DMF). Then, the solution was heated with stirring on a hotplate. Within 8-12 min, the solution color changed from yellow through red to purple, after which the temperature was quickly reduced via a cold-water bath. The product was purified by gradient centrifugation and then kept at 4°C.A rich variety of recipes are now available for making Ag nanoparticles in solution. DMF is one of the standard organic compounds used both as solvent and reducing agent. The reduction of Ag + ions in DMF can take place at room temperature, but the reaction rate is markedly increased at higher temperatures. It is also known that DMF slightly decomposes to a more easily oxidized amine upon aging or upon catalytic decomposition with solid base. The availability of the amine evidently accelerates the reduction of silver ions. (We found that dialkylamines are ineffective ...

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Synthesis of Silver Nanodisks Using Polystyrene Mesospheres as Templates

et al. 2002

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“…More recently, the localized surface plasmon resonance ͑LSPR͒ nanosensor becomes a hot spot due to their unique characteristics and potential market in the life sciences. [2][3][4][5][6] The LSPR nanosensor can be implemented through extremely simple, small, light, robust, low cost equipment. It has many advantages such as convenience, high sensitivity, wide application, real-time detection, etc.…”

Section: Introductionmentioning

confidence: 99%

Hybrid metallic nanoparticles for excitation of surface plasmon resonance

Zhu

Luo

et al. 2007

Journal of Applied Physics

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A Ag nanostructure was put forward in this paper. There are two types of Ag nanoparticles, spherical and pyramidal particles. Both of them have the same period, but different height and shapes. The hybrid nanoparticles can produce the localized surface plasmon resonance ͑LSPR͒, which couples each other and leads to an extra peak transmission. Our UV-visible-IR spectrophotometer measurement results show that some extra small and sharp peaks appear besides the normal LSPR wave peaks in the transmittance spectrum. The hybrid Ag nanoparticles being used as nanosensors will be more sensitive and selective than the conventional LSPR-based nanosensors.

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“…Scientist gained significant control both the over size [7] and surfaces [8][9][10][11][12] for nanoparticles. They have demonstrated that anisotropy in nanostructure like triangular prisms [13][14][15][16][17][18], nanoscale rods [19][20][21][22][23][24][25][26], nanoshells [27][28][29][30][31], multipods [32][33][34], disks [35][36][37][38][39] and cubes [40][41][42] shows better performance over solid spheres. …”

Section: Nanomaterials and Nanotechnologymentioning

confidence: 99%

Nanoplasmonics and its Applied Devices

Rahman¹

2014

Journal of Nanotechnology and Smart Materials

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Nanoplasmonics makes a connection to conventional optics to the nanoworld. Interesting performance like subwavelength focusing to invisibility cloaking, nanoplasmonics have profound applications in science and engineering world from biophotonics to nanocircuitry. Metal and dielectric have free d-shell electrons. When metal and dielectric of different refractive index come in contact, these free electrons get accumulated in a region at the metal-semiconductor interface forming nanoplasmons. Practical implementation of nano device fabrication is the most challenging task due to the dissipative losses in metal. The optimum operating condition can be achieved by the efficient use of optical gain. We review here the ongoing progress in the field of nanoplasmonic research.

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Silver Nanoshells: Variations in Morphologies and Optical Properties

Cited by 486 publications

References 22 publications

Synthesis of Silver Nanodisks Using Polystyrene Mesospheres as Templates

Synthesis of Silver Nanodisks Using Polystyrene Mesospheres as Templates

Hybrid metallic nanoparticles for excitation of surface plasmon resonance

Nanoplasmonics and its Applied Devices

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