Self-assembly of Organic Semiconducting Molecules Into One-dimensional Nanostructures PDF Download

Author: Kaushik Balakrishnan
Publisher:
ISBN:
Category :
Languages : en
Pages : 230

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Author: Aniket Datar
Publisher:
ISBN:
Category :
Languages : en
Pages : 152

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The use of organic semiconductors in electronic devices emerged with the fabrication of photovoltaic cells with organic dyes and in recent years their applications have extended to field effect transistors (FETs) and light emitting devices (LEDs). Increased attention towards organic semiconductors and materials is mainly due to flexibility they provide with respect to the properties of individual molecules and fabrication in desired shapes. Among n-type semiconductors, perylenetetracaboxylicdiimide (PTCDI), is gaining increasing attention due to its high photo and thermal stability. With the modification of side chains with different functionalities, one can tune the solubility of molecule in different solvent and the morphology of resultant molecular aggregates. Following work presents the use of PTCDI molecules with three different side chains attached to PTCDI core. We investigated the effect of different side chains on resultant morphology when fabricated through different processing techniques. Fabrication techniques applied are solution based processing and surface assisted solvent vapor annealing. The later technique provides a better control over the size and shape of resultant nanocrystals. We investigated the size and optical properties of nanocrystals formed with the help of atomic force microscopy (AFM) and near-field scanning optical microscopy (NSOM). Through solution based and surface assisted solvent vapor annealing processes under different conditions, we have fabricated nanocrystals with different aspect ratios, size and shape. Currently we are working on investigation of electrical measurements for application of nanocrystals in real time electronic devices.

Author: Chaoying Fu
Publisher:
ISBN:
Category :
Languages : en
Pages :

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"Molecular self-assembly, a promising bottom-up strategy for nanofabrication of functional devices, utilizes non-covalent interactions to yield well-defined supramolecular nanostructures. This method provides an inexpensive and versatile route to build the desired nanoarchitectures as compared to current top-down nanolithography methods. On the other hand, understanding and control of the supramolecular ordering of organic semiconducting (OSC) molecules at the interface is also crucial for optimization of thin-film optoelectronic applications. The supramolecular packing of OSC molecules in an active layer at the interface defines the exciton and charge transport properties and hence influences the device efficiency. This thesis studies the self-assembly properties of tailor-made OSC molecules. These molecules possess extended [pi]-conjugation and non-covalent intermolecular binding (e.g. hydrogen bonding) motifs and were designed to explore on-surface assembly of functional supramolecular architectures and two-dimensional (2D) polymers ("organic graphenes"). A series of derivatives of two isomeric tetrathienoanthracenes (TTAs), p-type semiconducting molecules, are designed and synthesized with different functionalities enabling their further chemical modification, their self-assembly via weak intermolecular interactions (i.e. hydrogen bonding, halogen bonding) and their polymerization. The versatile TTA derivatives are used to build 2D nanostructures and investigate the role of building block symmetry in controlling the order. The supramolecular packing of the OSC molecules at the interface is highly relevant for applications in organic field effect transistors (OFETs), where a charge transport mainly occurs within the first few layers close to the organic-dielectric interface. In this thesis, the initial stages of film growth of n-type semiconductors, mono-alkylated naphthalenediimides (NDI-R), are explored in solution and through vapor deposition on both conductive (HOPG) and insulating (SiO2) surfaces. The study indicates the retention of hydrogen bonding throughout the thin film growth, on both surfaces, mimicking the electrode and gate interfaces of actual OFET devices. Finally, the supramolecular ordering of diaryl diketopyrrolopyrrole (DPP), a common moiety for high-efficiency ambipolar OSC, is investigated as models of the corresponding oligomers and polymers. The effect of aryl-substituents on the hydrogen bonding of the structurally similar (hetero)aromatic-DPP building blocks is investigated in both molecular 2D self-assembly and crystal structures. Also, the mutual roles of alkyl chains and pending aryl substituents on dialkylated diaryl-DPP molecular planarity and packing are thoroughly assessed at both monolayer and bulk crystal levels.Overall, this thesis explores the relationship between the molecular structures and the on-surface supramolecular orderings of organic semiconducting molecules. It also establishes a general methodology for studying on-surface assemblies of such materials, integrating scanning tunneling microscopy (STM), atomic force microscopy (AFM), XRD and DFT analysis to create an overall view of molecular assembly growing from the surface, and evolving into thin films and, eventually, bulk crystals." --

Author: Ramanathan Nagarajan
Publisher: John Wiley & Sons
ISBN: 1119001366
Category : Science
Languages : en
Pages : 364

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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.

Author: Arvind Kumar
Publisher: John Wiley & Sons
ISBN: 3527837655
Category : Technology & Engineering
Languages : en
Pages : 373

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Book Description
1D Semiconducting Hybrid Nanostructures In-depth discussion on the physics, chemistry, and engineering beneath the construction of 1D semiconducting hybrid materials 1D Semiconducting Hybrid Nanostructures: Synthesis and Applications in Gas Sensing and Optoelectronics provides breakthrough research developments and trends in a variety of 1D hybrid nanostructures for chemi-resistive gas sensors and optoelectronics applications, including recent investigations and developments regarding the innovative designing approaches, fabrications, and methods used to characterize these hybrid nanostructures. The text also includes the surface and interface properties of 1D hybrid semiconducting nanostructured materials, as well as their optimization for applications in gas sensing and optoelectronics. This book further addresses the different issues of sensitivity, selectivity, and operating temperature of gas sensors based on hybrid 1D nanostructures. Moreover, it covers the novel and additional functional optoelectronic properties that originate at the interface of 1D semiconducting nanostructures combined with other low dimensional materials. Some of the specific sample topics covered in this book include: Gas sensing and optoelectronic applications of one-dimensional semiconducting hybrid nanostructures, plus synthesis and gas sensing application of 1D semiconducting hybrid nanostructures Room temperature gas sensing properties of metal oxide nanowire/graphene hybrid structures and highly sensitive room temperature gas sensors based on organic-inorganic nanofibers Synthesis and applications of 1D hybrid tin oxide nanostructures and recent advances in semiconducting nanowires-based hybrid structures for solar application Types of semiconducting hybrid nanostructures for optoelectronic devices and hybrid 1D semiconducting ZnO/GaN nanostructures Thanks to its comprehensive coverage of the subject from highly qualified authors who have significant experience in the field, 1D Semiconducting Hybrid Nanostructures is a must-have reference for senior undergraduate and graduate students, professionals, researchers, in the field of semiconductor physics, materials science, surface science, and chemical engineering.

Author: Shafigh Mehraeen
Publisher: BoD – Books on Demand
ISBN: 1789239605
Category : Technology & Engineering
Languages : en
Pages : 102

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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.

Author: Jin Zhang
Publisher: Springer Science & Business Media
ISBN: 0306479419
Category : Science
Languages : en
Pages : 327

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Nanostructures refer to materials that have relevant dimensions on the nanometer length scales and reside in the mesoscopic regime between isolated atoms and molecules in bulk matter. These materials have unique physical properties that are distinctly different from bulk materials. Self-Assembled Nanostructures provides systematic coverage of basic nanomaterials science including materials assembly and synthesis, characterization, and application. Suitable for both beginners and experts, it balances the chemistry aspects of nanomaterials with physical principles. It also highlights nanomaterial-based architectures including assembled or self-assembled systems. Filled with in-depth discussion of important applications of nano-architectures as well as potential applications ranging from physical to chemical and biological systems, Self-Assembled Nanostructures is the essential reference or text for scientists involved with nanostructures.

Author: Timothy Deming
Publisher: Springer Science & Business Media
ISBN: 3642271391
Category : Technology & Engineering
Languages : en
Pages : 184

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Synthesis of Polypeptides by Ring-Opening Polymerization of α-Amino Acid N-Carboxyanhydrides, by Jianjun Cheng and Timothy J. Deming.- Peptide Synthesis and Self-Assembly, by S. Maude, L. R. Tai, R. P. W. Davies, B. Liu, S. A. Harris, P. J. Kocienski and A. Aggeli.- Elastomeric Polypeptides, by Mark B. van Eldijk, Christopher L. McGann, Kristi L. Kiick andJan C. M. van Hest.- Self-Assembled Polypeptide and Polypeptide Hybrid Vesicles: From Synthesis to Application, by Uh-Joo Choe, Victor Z. Sun, James-Kevin Y. Tan and Daniel T. Kamei.- Peptide-Based and Polypeptide-Based Hydrogels for Drug Delivery and Tissue Engineering, by Aysegul Altunbas and Darrin J. Pochan.-

Author: Katharina Al-Shamery
Publisher: Springer Science & Business Media
ISBN: 3540719237
Category : Technology & Engineering
Languages : en
Pages : 369

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Book Description
This jaw-dropping window on the future is the first comprehensive overview of the fabrication, fundamental properties, and applications of a new class of nanoscaled organic materials. These materials offer incredible scope to scientists wanting to exploit their optical and electronic properties and offer the potential to create a new generation of tiny devices with powerful applications. Altogether, the book offers a unique integration of organic materials science basics, nanostructured organic materials fabrication, and device applications.

Author: H. Heinz
Publisher: Wiley
ISBN: 9781118557433
Category : Science
Languages : en
Pages : 400

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Book Description
The book explains the self-assembly of nanostructures derived from different materials classes for a broad range of applications. The starting materials comprise biomacromolecules, complex environments at cell surfaces, inorganic building blocks, and synthetic organic polymers. A team of leading experts focuses on the explanation of molecular recognition mechanisms at interfaces that enable control of driving forces for self-organization from the nanometer to the micrometer scale, including biotic-abiotic and inorganic-organic interfaces. The spectrum of topics includes signaling at cell membranes, biologically programmed mineralization of nanostructures, nano-designed building and transportation materials, as well as assembly of soft matter for energy conversion and electronic devices. Structure-property relationships of biological, medicinal, biomimetic, and functional materials from the nanoscale up will be supported by state-of-the-art synthesis, assembly, and characterization techniques, including recent developments in modeling and simulation. The book strives to balance fundamental concepts and emerging applications. The book shows parallels and differences between different fields such as bioengineering, inorganic chemistry, organic electronics, combinatorial materials design, modeling and theory.