Download or read book DNA Guided Self Assembly of Nanocrystals for Optoelectronic Devices written by Hyunwoo Noh and published by . This book was released on 2013 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: While inherent properties of nanocrystals have been actively investigated within the last decade, control over positioning and ordering of nanomaterials at multiple length scales has been difficult to achieve. In the research shown here, DNA is used in conjunction with metal and semiconductor nanocrystals to facilitate their assembly at precise locations on a substrate with potential for programmable ordering. The inimitable ability of DNA to binding through stable, specific, and reversible molecular recognition has allowed the creation of nanocrystal assemblies through extraordinary control over spatial location and crystallization. We first show an inexpensive printing method that enables repeated patterning of large area arrays of nanoscale materials by AFM and fluorescence microscopy. DNA strands were patterned with 50nm resolution by a soft-lithographic subtraction printing process and DNA hybridization was used to direct the assembly of 10nm gold nanoparticles to create ordered two-dimensional nanoparticle arrays. This technique was further modified to demonstrate methods to generate patterned nanocrystal superlattices. Electron microscopy and fourier transformation analysis were used to investigate the role of chemical and geometrical confinement on interparticle DNA hybridization and particle packing and obtaining long-range order. Using similar strategies, we also demonstrate the generation of highly ordered 3-D body-centered-cubic (BCC) superlattices of gold nanocrystals at desired areas on a surface through specific DNA interactions. In this work, controlled film thicknesses from 20nm to 100nm could be easily obtained by varying initial gold nanoparticle concentrations and particles remained ordered in the z-direction as well. These gold nanoparticle studies were then applied toward producing 3D thin film arrays of quantum dots (QDs) For this, successful aqueous phase transfer of CdTe QDs for DNA conjugation was first demonstrated. Next, the DNA conjugated CdTe QDs were assembled on TiO2 films to fabricate ITO/TiO2/DNA-CdTe/Au thin film devices which were then tested by current-voltage measurements. We demonstrate that producing close packed arrays as opposed to disordered ones significantly improves film formation with less defects. By tuning the QD size and film thicknesses, the correlation between Voc and Jsc values was investigated to show the possibility of charge transport through DNA-QDs assembly for the application of optoelectronic devices.

Download or read book Structural DNA Nanotechnology written by Nadrian C. Seeman and published by Cambridge University Press. This book was released on 2015 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the founder of the field, this is a comprehensive and accessible introduction to structural DNA nanotechnology.

Download or read book Design Synthesis and Characterization of Nanoscale Optical Devices Using DNA Directed Self assembly written by William Peter Klein and published by . This book was released on 2016 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Near-field energy transfer has great potential for use in nanoscale communications, biosensing, and light harvesting photonic devices. However, the light collecting and energy transferring efficiency of current devices is poor, resulting in few commercially available applications. Current human-made light harvesting devices lack the benefits of natural selection. Natural systems are typically highly optimized and highly efficient. For example, transfer efficiency in photosynthesis is greater than 90%. In this work, two classes of optical devices were designed, synthesized, and characterized: Plasmonic waveguides and FRET-based photonic devices. In the case of plasmonic waveguides, a multi-scaffold DNA origami synthesis method was developed to fabricate linear waveguides with 10-nm diameter gold nanoparticles. Precise control over interparticle gaps and interchromophore distances was demonstrated. Using a similar approach, DNA labeled fluorophores were arranged in linear and branched geometries to form FRET-based photonic wires and light harvesting devices. Recently, homogeneous FRET (homoFRET) has emerged as a potential way of increasing the transfer efficiency of photonic wires. However, little is known about the design principles needed to construct such devices. To address this knowledge gap, linear photonic wires, and three light harvesting devices were designed, synthesized, and characterized. All the devices contained a homoFRET region to extend the energy transfer distance. Over 50 different FRET-based photonic wires with different homogeneous FRET configurations were evaluated. Several configurations were found that resulted in a higher end-to-end efficiency despite possessing fewer dyes. A six-fold antenna gain was achieved in the case of the light-harvesting devices. The findings demonstrate that homoFRET can be used to increase the energy harvesting capability of photonic devices. In general, the work also showed that DNA nanotechnology can be used to self-assemble a variety of photonic devices. Additionally, the work has established some basic design rules that will enable the bottom-up assembly of more elaborate devices."--Boise State University ScholarWorks.

Download or read book Materials Nanoarchitectonics written by Katsuhiko Ariga and published by Elsevier. This book was released on 2023-12-07 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Download or read book DNA Directed Self assembly of Plasmonic Nanoparticles written by Suchetan Pal and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Deoxyribonucleic acid (DNA), a biopolymer well known for its role in preserving genetic information in biology, is now drawing great deal of interest from material scientists. Ease of synthesis, predictable molecular recognition via Watson-Crick base pairing, vast numbers of available chemical modifications, and intrinsic nanoscale size makes DNA a suitable material for the construction of a plethora of nanostructures that can be used as scaffold to organize functional molecules with nanometer precision. This dissertation focuses on DNA-directed organization of metallic nanoparticles into well-defined, discrete structures and using them to study photonic interaction between fluorophore and metal particle. Presented here are a series of studies toward this goal. First, a novel and robust strategy of DNA functionalized silver nanoparticles (AgNPs) was developed and DNA functionalized AgNPs were employed for the organization of discrete well-defined dimeric and trimeric structures using a DNA triangular origami scaffold. Assembly of 1:1 silver nanoparticle and gold nanoparticle heterodimer has also been demonstrated using the same approach. Next, the triangular origami structures were used to co-assemble gold nanoparticles (AuNPs) and fluorophores to study the distance dependent and nanogap dependencies of the photonic interactions between them. These interactions were found to be consistent with the full electrodynamic simulations. Further, a gold nanorod (AuNR), an anisotropic nanoparticle was assembled into well-defined dimeric structures with predefined inter-rod angles. These dimeric structures exhibited unique optical properties compared to single AuNR that was consistent with the theoretical calculations. Fabrication of otherwise difficult to achieve 1:1 AuNP- AuNR hetero dimer, where the AuNP can be selectively placed at the end-on or side-on positions of anisotropic AuNR has also been shown. Finally, a click chemistry based approach was developed to organize sugar modified DNA on a particular arm of a DNA origami triangle and used them for site-selective immobilization of small AgNPs.

Download or read book Self Assembly of Nanostructures and Patchy Nanoparticles written by Shafigh Mehraeen and published by BoD – Books on Demand. This book was released on 2020-11-04 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Top-down approaches are currently the main contributor of fabricating microelectronic devices. However, the prohibitive cost of numerous technological steps in these approaches is the main obstacle to further progress. Furthermore, a large number of applications necessitate fabrication of complex and ultra-small devices that cannot be made using these approaches. New approaches based on natural self-assembly of matter need to be developed to allow for fabrication of micro and nanoelectronic devices. Self-assembly of nanostructures is a dynamic field, which explores physics of these structures and new ways to fabricate them. However, the major problem is how to control the properties of the nanostructures resulting from low dimensionality. This book presents recent advances made to address this problem, and fabricate nanostructures using self-assembly.

Download or read book Evaporative Self assembly Of Ordered Complex Structures written by Zhiqun Lin and published by World Scientific. This book was released on 2012-02-28 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of spontaneous self-assembly, as a lithographic tool and as an external field-free means to construct well-ordered and intriguing patterns, has received much attention due to its ease of producing complex, large-scale structures with small feature sizes. An extremely simple route to highly-ordered, complex structures is the evaporative self-assembly of nonvolatile solutes (e.g., polymers, nanoparticles, carbon nanotubes, and DNA) from a sessile droplet on a solid substrate. To date, a few studies have elegantly demonstrated that self-organized nanoscale, microscale, and hierarchically structured patterns have been readily obtained from sophisticated control of droplet evaporation. These include convective assembly in evaporating menisci, the alignment of nanomaterials by programmed dip coating and controlled anisotrophic wetting/dewetting processes, facile microstructuring of functional polymers by the “Breath Figure” method, controlled evaporative self-assembly in confined geometries, etc.This book is unique in this regard in providing a wide spectrum of recent experimental and theoretical advances in evaporative self-assembly techniques. The ability to engineer an evaporative self-assembly process that yields a broad range of complex, well-ordered and intriguing structures with small feature sizes composed of polymers of nanocrystals of different size and shapes as well as DNA over large areas offers tremendous potential for applications in electronics, optoelectronics, photonics, sensors, information processing and data storage devices, nanotechnology, high-throughput drug discovery, chemical detection, combinatorical chemistry, and biotechnology.

Download or read book DNA directed Self assembly of Nanoparticle Arrays written by Jaswinder Kumar Sharma and published by . This book was released on 2009 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Self assembly of Nanoparticles in Photonic Crystal Cavities for Optoelectronic Devices written by Geetha Thiruvengadam and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Photonic crystals (PhC) offer many advantages in optoelectronics field. The focus of this thesis is to investigate a self assembly process for the formation of thin film based one-dimensional PhC and the integration of nanoparticles with two-dimensional PhC. Nanoparticles like SiO2, TiO2, PolyStyrene, and PbSe (with different surface properties) were subjected to different experiments. Various techniques, such as spin coating, immersion technique, evaporation induced assembly technique, have been carried out by varying parameters like time, temperature, position of the substrate, etc. An optimized method for the fabrication of 1D PhC was found to be evaporation induced Self-Assembly method by varying temperature. For 2D PhC, a process was developed based on immersion technique and subsequent surface cleaning, where SiO2 and PbSe nanoparticles are back filled into the air holes of 2D PhC. A theoretical study of radius of nanoparticles in 1D and forces acting on nanoparticles in 2D has been discussed.

Download or read book Self Assembly with DNA From Materials Design to Chromatin written by Joshua Paul Lequieu and published by . This book was released on 2017 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to engineer the self-assembly of nano-scale objects to create highly ordered materials is of considerable scientific and practical interest. This new class of materials represents a powerful approach for engineering a next generation of devices, whose mechanical, optical, and electrical properties can be precisely tuned at the molecular scale. Though significant strides towards this goal have been achieved in recent years, the complexity achieved in engineered systems is still far surpassed by that achieved by nature. Precise self-assembly is achieved by nature through proteins and nucleic acids that fold into intricate, three-dimensional, and importantly, functional structures. A promising avenue towards improved engineered systems is to draw on discoveries from biophysics in order to inspire new approaches and paradigms for self-assembly and materials design. In this work, we explore the interplay between biophysics and engineering by exploring the self-assembly of DNA. Our discussion begins at the smallest length-scales of DNA, first by understanding the hybridization of DNA, and then at how hybridization can be used in materials to direct the self-assembly of gold nanoparticles. We report the first evidence of a tunable mechanical response in these assemblies, thereby suggesting the possibility of mechanical meta-materials constructed using DNA. Our discussion then proceeds to larger length scales, where we examine the biophysical processes that control the compaction of DNA into chromatin. Using a detailed molecular model, we explore the free energies and dynamics of smallest building block of chromatin, a protein-DNA complex called the nucleosome. Our results are in quantitative agreement with existing experimental measurements, and help to explain the molecular factors that dictate the first stages of DNA compaction into chromatin. Lastly, we present a multi-scale approach that can couple information across different length scales of chromatin in order to examine the folding of large regions DNA. By drawing on both the biophysics and engineering literature, the findings presented here suggest new approaches for materials design, and offer new paradigms for synthetic systems that seek to mimic the complexity achieved by nature.

Download or read book Controlling Nanomaterial Self assembly for Next Generation Optoelectronic Applications written by Mark Clayton Weidman and published by . This book was released on 2017 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor nanocrystals, also known as quantum dots, are an exciting class of materials because their band gap can be tuned according to the nanocrystal size. In this way, the material band gap can be largely decoupled from its atomic composition - a property unique to this system. The potential applications for semiconductor nanocrystals are wide ranging and include: LEDs, photovoltaics, photon downconversion, photon upconversion, and thermoelectrics. However, their size-dependent band gap can also be a hindrance, as any size variation in the ensemble of nanocrystals introduces energetic disorder and spatial disorder in films. While synthesized as a colloid, for most applications the nanocrystals are deposited as a thin film. The rate of energy transfer between nanocrystals in the film, dictated by the arrangement and distance between neighbors, is therefore a critical parameter affecting device efficiency. As a result, controlling the nanocrystal physical arrangement is crucial to the success of these materials. Despite this, there is a lack of understanding of how to observe and control these processes at the nanoscale. This thesis begins by improving the synthesis of lead sulfide (PbS) nanocrystals to produce narrow size dispersity ensembles with tunable average size by ensuring the reaction is diffusion-limited. We then experimentally determine what parameters (ligand coverage, solvent, size dispersity) most affect the ability of these nanocrystals to self-assemble into highly ordered superlattice structures. We show that superlattices can be produced with a wide variety of surface ligands of differing lengths, either directly from a colloidal suspension or post-deposition and we thoroughly characterize the interparticle spacing as a function of ligand species. Next, we demonstrate an in situ X-ray scattering technique which enables the real-time visualization of nanocrystal self-assembly, with details unprecedented by any other experimental method. This technique led to a better understanding of the colloid to superlattice transition, including the observation of intermediate states and the ability to compare kinetics of different self-assembly aspects. Finally, we present experimental measurements demonstrating that nanocrystal size dispersity and selfassembly are critical to efficient energy transfer in films and that as energetic disorder is minimized through improved synthetic methods, spatial disorder becomes an increasingly important parameter to control. In the final experimental chapter of this thesis, we apply this knowledge to a different material system perovskite nanoplatelets, which have the potential to be useful as an inexpensive, solution-processable emission material. For these 2D materials, we optimize the thickness homogeneity and study the selfassembly of the nanoplatelets into stacked superstructures. We highlight the incredible tunability of this material system accessible through thickness and compositional tuning, which allows absorption and emission to be shifted across the entire visible range. Lastly, we demonstrate the potential of this system for next generation LEDs.

Download or read book Atomically Precise Nanochemistry written by Rongchao Jin and published by John Wiley & Sons. This book was released on 2023-06-12 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Self assembly and Guided Self assembly of InAs Nanocrystals written by Zuoming Zhao and published by . This book was released on 2006 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book DNA and Protein Directed Self assembly of Nanoparticles written by Stephen Cobbe and published by . This book was released on 2003 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simulation of DNA Induced Self assembly of Nanoparticles written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Self Assembly written by Ramanathan Nagarajan and published by John Wiley & Sons. This book was released on 2019-01-07 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the state-of-the-art of the diverse self-assembly systems Self-Assembly: From Surfactants to Nanoparticles provides an effective entry for new researchers into this exciting field while also giving the state of the art assessment of the diverse self-assembling systems for those already engaged in this research. Over the last twenty years, self-assembly has emerged as a distinct science/technology field, going well beyond the classical surfactant and block copolymer molecules, and encompassing much larger and complex molecular, biomolecular and nanoparticle systems. Within its ten chapters, each contributed by pioneers of the respective research topics, the book: Discusses the fundamental physical chemical principles that govern the formation and properties of self-assembled systems Describes important experimental techniques to characterize the properties of self-assembled systems, particularly the nature of molecular organization and structure at the nano, meso or micro scales. Provides the first exhaustive accounting of self-assembly derived from various kinds of biomolecules including peptides, DNA and proteins. Outlines methods of synthesis and functionalization of self-assembled nanoparticles and the further self-assembly of the nanoparticles into one, two or three dimensional materials. Explores numerous potential applications of self-assembled structures including nanomedicine applications of drug delivery, imaging, molecular diagnostics and theranostics, and design of materials to specification such as smart responsive materials and self-healing materials. Highlights the unifying as well as contrasting features of self-assembly, as we move from surfactant molecules to nanoparticles. Written for students and academic and industrial scientists and engineers, by pioneers of the research field, Self-Assembly: From Surfactants to Nanoparticles is a comprehensive resource on diverse self-assembly systems, that is simultaneously introductory as well as the state of the art.

Download or read book Self assembly of Complex DNA Nanostructures and Reconfigurable DNA Devices written by Fei Zhang and published by . This book was released on 2015 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deoxyribonucleic acid (DNA) has emerged as an excellent molecular building block for nanoconstruction in addition to its biological role of preserving genetic information. Its unique features such as predictable conformation and programmable intra- and inter-molecular Watson-Crick base pairing interactions make it a remarkable engineering material. A variety of convenient design rules and reliable assembly methods have been developed to engineer DNA nanostructures. The ability to create designer DNA architectures with accurate spatial control has allowed researchers to explore novel applications in directed material assembly, structural biology, biocatalysis, DNAcomputing, nano-robotics, disease diagnosis, and drug delivery. This dissertation focuses on developing the structural design rules for "static" DNA nano-architectures with increasing complexity. By using a modular self-assembly method, Archimedean tilings were achieved by association of different DNA motifs with designed arm lengths and inter-tile sticky end interactions. By employing DNA origami method, a new set of design rules was created to allow the scaffolds to travel in arbitrary directions in a designed geometry without local symmetry restrictions. Sophisticated wireframe structures of higher-order complexity were designed and constructed successfully. This dissertation also presents the use of "dynamic" DNA nanotechnology to construct DNA origami nanostructures with programmed reconfigurations.