DNA-directed Self-assembly of Nanoparticle Arrays PDF Download

Author: Jaswinder Kumar Sharma
Publisher:
ISBN:
Category : DNA.
Languages : en
Pages : 430

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Author: Jason Kee Yang Ong
Publisher:
ISBN: 9781321081305
Category : Nanotechnology
Languages : en
Pages : 139

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The biggest attraction of building nanometer structures is the emergence of novel properties and phenomena at these length scales. In the discipline of electronics particularly, nanoscale bridges the gap between the microscopic quantum world to the macroscopic classical world. The bridge can be tailored to effectively affect the material properties. One of the well-known phenomena that is altered at the nanoscale is the electron transport through a metal, i.e. the Ohm's law. As the size of the metal particle reduces to nanometer, Ohm's law breaks down due to trapping of a single electron charge, i.e. local charging, that prohibits the subsequent steam of electrons to pass through. This phenomenon is referred to as the Coulomb blockade, where the current is blocked below a threshold bias, VT. However, to observe a robust VT, the system has to be cooled to cryogenic temperatures. Here, fabrication and construction of a nano-system using directed self-assembled network of 1D necklace of 10 nm Au particles are described, which exhibits a robust single electron effect with a record high VT of 7.5 V at room temperature and a subsequent current, I rise as ( V/VT -- 1)&zgr;, where &zgr; is a critical constant, usually around 2. These physical parameters can be precisely tuned by tailoring the dimension and topology of the ensemble. The finding is important as nanoparticle based Single Electron Devices (SEDs) have become of great interest due to their orders of magnitude high sensitivity to gating. For over six decades of research on SEDs, it is clear that V T > 2 V at room temperature is required to make a robust device to eliminate the omnipresent "quantum noise" in these systems. Our system has not only shown a room temperature VT of well above 2 V but also its easy integrability with microelectronics circuits. Detailed scientific studies have been performed on the formation and structure of necklace array to understand the assembly process. Subsequent modification of the necklace array can be performed by nano-cementing to regulate its electrical and optoelectronic properties while maintaining the single electron effect. In the second aspect of the process, the device fabrication, a method implementing soft-lithography and electron beam has been developed to pattern the necklace monolayer with custom design at sub-micron levels. The technique confines the network of the necklaces to a width small enough that the current is limited to a single necklace array connecting two larger necklace network clusters. The approach allows fundamental and sophisticated measurements to be conducted to study mesoscale properties of disordered structures.

Author: Roel Gronheid
Publisher: Woodhead Publishing
ISBN: 0081002610
Category : Technology & Engineering
Languages : en
Pages : 328

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The directed self-assembly (DSA) method of patterning for microelectronics uses polymer phase-separation to generate features of less than 20nm, with the positions of self-assembling materials externally guided into the desired pattern. Directed self-assembly of Block Co-polymers for Nano-manufacturing reviews the design, production, applications and future developments needed to facilitate the widescale adoption of this promising technology. Beginning with a solid overview of the physics and chemistry of block copolymer (BCP) materials, Part 1 covers the synthesis of new materials and new processing methods for DSA. Part 2 then goes on to outline the key modelling and characterization principles of DSA, reviewing templates and patterning using topographical and chemically modified surfaces, line edge roughness and dimensional control, x-ray scattering for characterization, and nanoscale driven assembly. Finally, Part 3 discusses application areas and related issues for DSA in nano-manufacturing, including for basic logic circuit design, the inverse DSA problem, design decomposition and the modelling and analysis of large scale, template self-assembly manufacturing techniques. Authoritative outlining of theoretical principles and modeling techniques to give a thorough introdution to the topic Discusses a broad range of practical applications for directed self-assembly in nano-manufacturing Highlights the importance of this technology to both the present and future of nano-manufacturing by exploring its potential use in a range of fields

Author: Randall Mark Stoltenberg
Publisher: Stanford University
ISBN:
Category :
Languages : en
Pages : 249

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Directed assembly of single molecules is a central theme in nanotechnology. This body of work was inspired by a specific challenge involving ordered deposition of single DNAs on surfaces for massively parallel single molecule DNA sequencing via fluorescence microscopy. A potential 10-fold gain in data density is possible if single molecules can be forced into a regular array rather than randomly deposited. The dimensions of such an array are difficult to achieve with conventional lithography techniques. On one end, molecules must be separated by sufficient distance so their optical signatures do not overlap. This distance is on the order of hundreds of nanometers. On the other end, the attachment points for the molecules must have molecular dimensions. Bridging these two length scales is a formidable task. The ability to place nanometer scale objects with nanometer precision can been achieved through atomic force microscopy, scanning tunneling microscopy, optical tweezers, and ebeam lithography. All of these techniques, however, are serial in nature and hence do not serve the intended gain in data density. Another approach toward directed patterning of single molecules is through self-assembly. In this work, self-assembly of block copolymers is explored as a means to addressing the molecular and optical resolution length scales simultaneously. First, the challenge of molecular patterning for single molecule fluorescence microscopy is explored theoretically and the limits of this approach are defined. Block copolymers are introduced as a possible solution to generating the correct surface patterns for improved data density, and experimental results are compared to theoretical predictions. Second, the surface chemistry of these arrays is characterized, and I will show they can be selectively functionalized in preparation for directed assembly of DNAs. Third, these arrays are integrated into single molecule fluorescence imaging experiments to determine their potential for improved data density. What emerges from this work is not only a viable platform for increased single molecule fluorescence data density, but also a deeper understanding of the requirements for directed self-assembly of single molecules.

Author: Thu Bach Tran
Publisher:
ISBN:
Category : Nanoparticles
Languages : en
Pages : 178

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Author: Alexandru Grumezescu
Publisher: William Andrew
ISBN: 0323417353
Category : Technology & Engineering
Languages : en
Pages : 529

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Fabrication and Self-Assembly of Nanobiomaterials presents the most recent findings regarding the fabrication and self-assembly of nanomaterials for different biomedical applications. Respected authors from around the world offer a comprehensive look at how nanobiomaterials are made, enabling knowledge from current research to be used in an applied setting. Recent applications of nanotechnology in the biomedical field have developed in response to an increased demand for innovative approaches to diagnosis, exploratory procedures and therapy. The book provides the reader with a strong grounding in emerging biomedical nanofabrication technologies, covering numerous fabrication routes for specific applications are described in detail and discussing synthesis, characterization and current or potential future use. This book will be of interest to professors, postdoctoral researchers and students engaged in the fields of materials science, biotechnology and applied chemistry. It will also be highly valuable to those working in industry, including pharmaceutics and biotechnology companies, medical researchers, biomedical engineers and advanced clinicians. An up-to-date and highly structured reference source for practitioners, researchers and students working in biomedical, biotechnological and engineering fields A valuable guide to recent scientific progress, covering major and emerging applications of nanomaterials in the biomedical field Proposes novel opportunities and ideas for developing or improving technologies in fabrication and self-assembly

Author: Rongchao Jin
Publisher: John Wiley & Sons
ISBN: 1119788641
Category : Technology & Engineering
Languages : en
Pages : 533

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Explore recent progress and developments in atomically precise nanochemistry Chemists have long been motivated to create atomically precise nanoclusters, not only for addressing some fundamental issues that were not possible to tackle with imprecise nanoparticles, but also to provide new opportunities for applications such as catalysis, optics, and biomedicine. In Atomically Precise Nanochemistry, a team of distinguished researchers delivers a state-of-the-art reference for researchers and industry professionals working in the fields of nanoscience and cluster science, in disciplines ranging from chemistry to physics, biology, materials science, and engineering. A variety of different nanoclusters are covered, including metal nanoclusters, semiconductor nanoclusters, metal-oxo systems, large-sized organometallic nano-architectures, carbon clusters, and supramolecular architectures. The book contains not only experimental contributions, but also theoretical insights into the atomic and electronic structures, as well as the catalytic mechanisms. The authors explore synthesis, structure, geometry, bonding, and applications of each type of nanocluster. Perfect for researchers working in nanoscience, nanotechnology, and materials chemistry, Atomically Precise Nanochemistry will also benefit industry professionals in these sectors seeking a practical and up-to-date resource.

Author: Katsuhiko Ariga
Publisher: Elsevier
ISBN: 0323994733
Category : Technology & Engineering
Languages : en
Pages : 648

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Materials Nanoarchitectonics: From Integrated Molecular Systems to Advanced Devices provides the latest information on the design and molecular manipulation of self-organized hierarchically structured systems using tailor-made nanoscale materials as structural and functional units. The book is organized into three main sections that focus on molecular design of building blocks and hybrid materials, formation of nanostructures, and applications and devices. Bringing together emerging materials, synthetic aspects, nanostructure strategies, and applications, the book aims to support further progress, by offering different perspectives and a strong interdisciplinary approach to this rapidly growing area of innovation. This is an extremely valuable resource for researchers, advanced students, and scientists in industry, with an interest in nanoarchitectonics, nanostructures, and nanomaterials, or across the areas of nanotechnology, chemistry, surface science, polymer science, electrical engineering, physics, chemical engineering, and materials science. Offers a nanoarchitectonic perspective on emerging fields, such as metal-organic frameworks, porous polymer materials, or biomimetic nanostructures Discusses different approaches to utilizing "soft chemistry" as a source for hierarchically organized materials Offers an interdisciplinary approach to the design and construction of integrated chemical nano systems Discusses novel approaches towards the creation of complex multiscale architectures

Author: Sarah Marie Adams
Publisher:
ISBN: 9781267802958
Category :
Languages : en
Pages : 178

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This dissertation demonstrates chemically-driven self-assembly techniques to produce assemblies of closely-spaced metal nanoparticles from colloidal nanoparticle solution in order to engineer enhanced optical fields. Planar nanoparticle assemblies provide a platform for a multitude of applications and material architectures. With nanoscale inter-particle spacing, metallic nanoparticles enable increased efficiency of photovoltaic devices due to light focusing and enhancement of electromagnetic fields useful for optical sensing of molecules due to coupling of the plasmon resonance in nanoparticle gaps. For molecular sensors, development of self-assembled two-dimensional assemblies of closely-spaced nanoparticles is useful for producing surface plasmon resonance sensors and surface-enhanced Raman spectroscopy (SERS) based sensing. Using chemical self-assembly, monodisperse, colloidal gold nanoparticles were attached on self-organized polymer templates in order to pattern assemblies of nanoparticle clusters with sub-10 nanometer inter-particle spacing. First citrate-stabilized Au nanoparticles were functionalized with thioctic acid ligands in solution. Then poly(methyl methacrylate) domains in phase-separated poly(styrene-block-methyl methacrylate) (PS-b-PMMA) thin films were chemically modified with surface amine functional groups. Au nanoparticles were preferentially attached to the functionalized PMMA surface domains using cross-linking chemistry. This method allows for versatility of size, shape, and composition. In this dissertation, we demonstrated attachment of 5, 10, and 20 nm Au and 20 nm Ag nanoparticles. PS-b-PMMA thin films also exhibit versatility of domain size and morphology by varying polymer molecular weights. The nanoparticle diameter to PMMA domain size ratio influenced the cluster size. As the ratio decreased, larger clusters were observed on PMMA domains with increased frequency. SERS measurement of nanoparticle assemblies showed uniform signal enhancement across samples with enhancements as high as 109. Reusability of SERS substrates with simple analyte removal between measurements was also observed. Two different deposition methods, diffusion and electrophoresis, were compared in terms of Au nanoparticle coverage, and inter-particle spacing. We found electrophoresis provided comparable nanoparticle coverage to diffusion deposition with 83% reduced processing time, 23% increased cluster formation, and 40% reduced inter-particle spacing. As optical field strength increases with decreased inter-particle spacing, fast processing times and high coverage of closely-spaced clustered nanoparticles would benefit for efficient and economical manufacturing of chemically assembled sensors and light-trapping surfaces on solar cells.

Author: Matthew M. Shindel
Publisher:
ISBN:
Category :
Languages : en
Pages : 316

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