Thickness-dependent blue shift in the excitonic peak of conformally grown ZnO:Al on ion-beam fabricated self-organized Si ripples

2015 ◽  
Vol 118 (10) ◽  
pp. 104903 ◽  
Author(s):  
T. Basu ◽  
M. Kumar ◽  
S. Nandy ◽  
B. Satpati ◽  
C. P. Saini ◽  
...  
Keyword(s):  
Ion Beam ◽  
Blue Shift ◽  
Excitonic Peak ◽  
Self Organized

scholarly journals Ion Beam Nanopatterning of Biomaterial Surfaces

2021 ◽  
Vol 11 (14) ◽  
pp. 6575
Author(s):  
Yu Yang ◽  
Adrian Keller
Keyword(s):  
Material Properties ◽  
Ion Beam ◽  
The Self ◽  
Solid Surfaces ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Future Directions ◽  
Self Organized ◽  
Functional Surfaces ◽  
Biomaterial Surfaces

Ion beam irradiation of solid surfaces may result in the self-organized formation of well-defined topographic nanopatterns. Depending on the irradiation conditions and the material properties, isotropic or anisotropic patterns of differently shaped features may be obtained. Most intriguingly, the periodicities of these patterns can be adjusted in the range between less than twenty and several hundred nanometers, which covers the dimensions of many cellular and extracellular features. However, even though ion beam nanopatterning has been studied for several decades and is nowadays widely employed in the fabrication of functional surfaces, it has found its way into the biomaterials field only recently. This review provides a brief overview of the basics of ion beam nanopatterning, emphasizes aspects of particular relevance for biomaterials applications, and summarizes a number of recent studies that investigated the effects of such nanopatterned surfaces on the adsorption of biomolecules and the response of adhering cells. Finally, promising future directions and potential translational challenges are identified.

Spontaneous formation of nanometer-scale self-organized structures in Ag-Cu alloys under irradiation

2000 ◽  
Vol 647 ◽  
Author(s):  
Raúl A. Enrique ◽  
Pascal Bellon
Keyword(s):  
Ion Irradiation ◽  
Ion Beam ◽  
Solute Concentration ◽  
Irradiation Temperature ◽  
Nanometer Scale ◽  
Beam Irradiation ◽  
X Ray Diffraction ◽  
Ion Beam Irradiation ◽  
Self Organized ◽  
The One

AbstractIon-beam irradiation can be used as a processing tool to synthesize metastable materials. A particular case is the preparation of solid solutions from immiscible alloys, which have been achieved for a whole range of systems. In this process, enhanced solute concentration is obtained through the local mixing induced by each irradiation event, which if occurring at a high enough frequency, can outweigh demixing by thermal diffusion. The resulting microstructure forms in far from equilibrium conditions, and theoretical results for these kind of driven alloys have shown that novel microstructures exhibiting self-organization can develop. To test these predictions, we prepare Ag-Cu multilayered thin films that we subject to 1 MeV Kr+-ion irradiation at temperatures ranging from room temperature to 225 °C, and characterize the specimens by x-ray diffraction, TEM and STEM. We observe two different phenomena occurring at different length scales: On the one hand, regardless of the irradiation temperature, grains grow under irradiation until reaching a size limited by film thickness (~200 nm). On the other hand, the distribution of species inside the grains is greatly affected by the irradiation temperature. At intermediate temperatures, a semi-coherent decomposition is observed at a nanometer scale. This nanometer-scale decomposition phenomenon appears as an evidence of patterning, and thus confirms on the possibility of using ion-beam irradiation as a route to synthesize nanostructured materials with novel magnetic and optical properties.

scholarly journals Self-Organized Conductive Gratings of Au Nanostripe Dimers Enable Tunable Plasmonic Activity

2020 ◽  
Vol 10 (4) ◽  
pp. 1301
Author(s):  
Maria Caterina Giordano ◽  
Matteo Barelli ◽  
Giuseppe Della Valle ◽  
Francesco Buatier de Mongeot
Keyword(s):  
High Efficiency ◽  
Ion Beam ◽  
Near Field ◽  
Cost Effective ◽  
Localized Surface Plasmon ◽  
Large Area ◽  
Field Amplification ◽  
Self Organized ◽  
Broadband Spectrum ◽  
Out Of Plane

Plasmonic metasurfaces based on quasi-one-dimensional (1D) nanostripe arrays are homogeneously prepared over large-area substrates (cm2), exploiting a novel self-organized nanofabrication method. Glass templates are nanopatterned by ion beam-induced anisotropic nanoscale wrinkling, enabling the maskless confinement of quasi-1D arrays of out-of-plane tilted gold nanostripes, behaving as transparent wire-grid polarizer nanoelectrodes. These templates enable the dichroic excitation of localized surface plasmon resonances, easily tunable over a broadband spectrum from the visible to the near- and mid-infrared, by tailoring the nanostripes’ shape and/or changing the illumination conditions. The controlled self-organized method allows the engineering of the nanoantennas’ morphology in the form of Au-SiO2-Au nanostripe dimers, which show hybridized plasmonic resonances with enhanced tunability. Under this condition, superior near-field amplification is achievable for the excitation of the hybridized magnetic dipole mode, as pointed out by numerical simulations. The high efficiency of these plasmonic nanoantennas, combined with the controlled tuning of the resonant response, opens a variety of applications for these cost-effective templates, ranging from biosensing and optical spectroscopies to high-resolution molecular imaging and nonlinear optics.

Self-organized surface nanopatterns on Cd(Zn)Te crystals induced by medium-energy ion beam sputtering

2013 ◽  
Vol 46 (45) ◽  
pp. 455302 ◽  
Author(s):  
R Gago ◽  
L Vázquez ◽  
F J Palomares ◽  
F Agulló-Rueda ◽  
M Vinnichenko ◽  
...  
Keyword(s):  
Ion Beam ◽  
Medium Energy ◽  
Ion Beam Sputtering ◽  
Self Organized ◽  
Beam Sputtering

scholarly journals Applications of Microbeams Produced by Tapered Glass Capillary Optics

2020 ◽  
Vol 4 (2) ◽  
pp. 22 ◽  
Author(s):  
Tokihiro Ikeda
Keyword(s):  
Ion Beam ◽  
Transmission Mechanism ◽  
Glass Capillary ◽  
Self Organized ◽  
Transmission Mechanisms ◽  
Beam Analysis ◽  
Capillary Optics ◽  
Cell Surgery ◽  
First Time ◽  
Experimental And Theoretical Studies

Production of ion microbeams using tapered glass capillary optics was introduced more than 10 years ago. This technique has drawn attention in terms of both its peculiar transmission features and application to ion beam analysis. The transmission mechanism based on a self-organized charge-up process for keV-energy ions was observed for the first time in an experiment using a multitude of nanometer-sized capillaries in a polymer foil. The same mechanism can be seen for the transmission of keV ions through a single tapered glass capillary. The transmission experiments with keV ions showed a delayed transmission, focusing effects, guiding effects, and formation of microbeams. Experiments using MeV-energy ions always aim at applications of microbeam irradiation for material analysis, surface modification, cell surgery, and so on. In this article, the applications of MeV ion microbeams, including the fabrication method of the glass capillary, are reviewed, as well as the experimental and theoretical studies for the transmission mechanisms of keV/MeV ions.

Self-Organized ZnSe Quantum Dots: Synthesis and Characterization

2008 ◽  
Vol 8 (3) ◽  
pp. 1502-1511
Author(s):  
Diksha Kaushik ◽  
R. R. Singh ◽  
A. B. Sharma ◽  
D. Gupta ◽  
M. Sharma ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Tight Binding ◽  
Blue Shift ◽  
Luminescence Spectroscopy ◽  
Self Organized ◽  
Chemical Technique ◽  
Oxide Substrate ◽  
Indium Tin Oxide Substrate

Self-organized ZnSe quantum dots (Q-ZnSe) were grown on indium tin oxide substrate using wet chemical technique without or in presence of copper and manganese dopants. The structural, morphological and luminescence properties of the as grown Q-dot films have been investigated, using X-ray diffraction, transmission electron microscopy, atomic force microscopy and optical and luminescence spectroscopy. Composition of the samples were analyzed using atomic absorption spectroscopy. The quantum dots have been shown to deposit in a compact, uniform and organized array on the indium tin oxide substrate. The size dependent blue shift in the experimentally determined absorption edge has been compared with the theoretical predictions based on the effective mass and tight binding approximations. It is shown that the experimentally determined absorption edges depart significantly from the theoretically calculated values. The photoluminescence properties of the undoped as well as doped Q-ZnSe have also been discussed.

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