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Showing 1 to 20 of 38 for “"Silicon Nanoparticles"”.
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Fully printed transistors employing silicon nanoparticles
… on printed electronics using nanoparticulate silicon, with the aim of producing fully printed transistors. All of the printed transistors produced to date have been field-effect transistors (FETs), due to the fact that printing processes are easily applicable to the planar FET architectures. …
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Surface modification of hydrogen-terminated silicon nanoparticles.
Abstract not available.
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The Fabrication of Thermoelectric Materials Using Functionalised Silicon Nanoparticles
Silicon nanoparticles (SiNPs) can be synthesised by a variety of methods. A one-pot synthesis based on the chemical reduction of inverse micelles has been used to produce SiNPs with ligands of varying alkyl chain length. These particles were characterised to determine how the chain length affects …
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Complex of heavy magnetic ions and luminescent silicon nanoparticles
We study the optical properties of luminescent silicon nanoparticles in the presence of magnetic ions of iron or erbium in solution and electric biasing. Upon the introduction of the ions under zero biasing, the luminescence is enhanced to by 50%. The peak position of the nanoparticle's spectrum …
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Size Dependence of the Electrical Characteristics of Silicon Nanoparticles
We studied the electronic properties of silicon nanoparticles with sizes rang- ing from 2.9 to 1 nm in diameter. Using a scanning tunneling microscope we studied the electronic structure of the particles. Resonant tunneling through hole states was observed when the samples were excited with light. …
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Designing and characterizing hyperpolarizable silicon nanoparticles for magnetic resonance imaging
… noise. It has been shown that ballmilled silicon nanoparticles have the advantageous properties of hyperpolarizability and biodegradability, but in vivo utilization requires the modification of the particle surface to prevent aggregation that leads to very fast removal from circulation …
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Synthesis, Characterisation and Biological Activity of Silicon Nanoparticles Functionalised by Anticancer Compounds
Abstract Silicon Nanoparticles (SiNPs) are non-toxic materials particularly suitable for various biomedical applications. They exhibit unique optical properties for use in bioimaging and diagnostic applications. To exploit these aspects, this thesis explores the synthesis, characterisation and …
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Synthesis and functionalization of carbohydrate capped silicon nanoparticles for targeting cancer cells
Silicon nanoparticles (SiNPs) hold prominent interest in various aspects of biomedical applications. For this purpose, surface functionalization of the NPs is essential to stabilize them. A facile method is reported here to synthesize highly stable and brightly luminescent amine-terminated SiNPs. …
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Synthesis, Characterisation and Device Application of Silicon Nanoparticles produced by Mechanical Attrition
Nanostructured silicon is a promising materials for research because it serves as building blocks for nanotechnological applications, such as nano and quantum electronics, sensors and energy applications. However, many of the synthesis methods come with an increased level of sophistication, and …
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Luminescent Silicon Nanoparticles: An improved inverse micelle synthesis and oxide-dependent photoluminescence studies
The luminescence of silicon nanoparticles has been an active area of study for a number of years. These nanoparticles luminesce when excited by ultraviolet (UV) light in the ~340 nm region, displaying either a blueish or a reddish colour. The control and origin of these colours has been debated, …
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A Time-Resolved Fluorescence Study of Silicon Nanoparticles: Testing the Dimer Stretching Model
The role of surface dimers in the fluorescence mechanism is explored using the theoretical framework of Allan, Delerue, and Lanoo [1]. Their single dimer computations are extended to a fully reconstructed structure using time dependent density functional theory. Despite the inclusion of a fully …
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The role of quantum confinement effects in the visible photoluminescence from silicon nanoparticles
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Optical Characterization of Ultrasmall, Hydrogen -Terminated and Carboxyl -Functionalized Silicon Nanoparticles in Aqueous Environments
In the second part, three central elements establish that the carboxyl-functionalized Si-np have excellent potential for use as a luminescent marker in aqueous systems. First, they are shown to be ultrasmall, with a diameter of ∼1 nm, comparable to that of common organic fluorophores. Second, …
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Optical Characterization of Ultrasmall, Hydrogen-Terminated and Carboxyl-Functionalized Silicon Nanoparticles in Aqueous Environments
… and chemical properties of ultrasmall (~1 nm) silicon nanoparticles (Si-np) in aqueous environments, focusing on their potential for use as luminescent markers in biophysical and biological applications. Two systems are presented in detail: (1) Chapters 2-4 cover hydrogen-terminated Si-np that …
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A study of the molecular behavior in the vibronic and excitonic properties of silicon nanoparticles
The molecular behavior of silicon nanoparticles, produced via electrochemical etching of a bulk precursor, is studied. The smallest particle, 1 nrn in diameter, is amenable to first principles modeling due to the manageable number of atoms in the structure. The ability to produce these particles in …
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Synthesis and characterisation of doped silicon nanoparticles by hot wire thermal catalytic and spark pyrolysis
Doped silicon nanoparticles with clean surfaces and which are suitable forelectronic applications, have successfully been produced. The doped silicon nanoparticles produced in this work will find application in the emerging field of flexible electronics. Two bottom-up production processes were …
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One-pot synthesis and characterisation of alkyl functionalised silicon nanoparticles, using an inverse micelle based method.
Silicon nanoparticles (SiNPs) are subject to research in a variety of fields and their synthesis is of increasing importance. A simple, cheap and easily scalable solution based synthesis method of alkyl terminated SiNPs is reported here. The produced SiNPs were imaged with a transmission electron …
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Nonvolatile memory devices with colloidal, 1.0 nm silicon nanoparticles : principles of operation, fabrication, measurements, and analysis
Silicon nanoparticles are candidate charge trapping and storage elements for future high density, low-voltage nonvolatile memory devices. Most previous works have studied nanoparticles of larger than 5 nm size and exhibited bulk-like trapping characteristics. Technologically viable and competitive …
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Characterisation of silicon nanoparticles produced by mechanical attrition using scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoemission spectroscopy
… devices. However, to produce working devices, nanoparticles have to meet requirements on size, shape, and composition. In the application of silicon nanoparticles in electronics, it is important that a network of interconnecting particles is formed through which charge transport can take place. …
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