Carbon nanotubes and organic conjugated polymers were used to synthesize nanocomposites as the new active semiconductor materials that were used for fabricating two device architectures: thin film coating and cascade solar cell fiber. The objective of this project is to develop organic nano-electronic-based photovoltaics. The main tasks of this project include materials synthesis, characterization, theoretical calculations, organic solar cell device fabrication and test. This report summarizes the main work performed by New Mexico State University and University of Houston on a DOE sponsored project High Efficiency Cascade Solar Cells. Implications of the findings to the design of interfacial reactivities via core-shell nanocomposites for magnetic, catalytic, and biological applications are also briefly discussed. The SQUID data reveal a decrease in magnetization and blocking temperature and an increase in coercivity for reflecting the decreased coupling of the magnetic moments as a result of the increased interparticle spacing by both gold and capping shells. The interfacial reactivity of a combination of ligand-exchanging and interparticle cross-linking was exploited for molecularly mediated thin film assembly of the core-shell nanoparticles. Fe3O4 nanoparticles of selected sizes were used as seeding materials for the reduction of gold precursors to produce gold-coated Fe3O4 nanoparticles Experimental data from both physical and chemical determinations of the changes in particle size, surface plasmon resonance optical band, core-shell composition, surface reactivity, and magnetic properties have confirmed the formation of the more » core-shell nanostructure. This paper describes findings of an investigation of the synthesis and assembly of core (Fe3O4)-shell (An) nanoparticles with high monodispersity. The ability to synthesize and assemble monodispersed core-shell nanoparticles is important for exploring the unique properties of nanoscale core, shell, or their combinations in technological applications. « lessĪuthors: Wang, Lingyan Luo, Jin Maye, Mathew M Fan, Quan Qiang, Rendeng Engelhard, Mark H Wang, Chong M Lin, Yuehe Zhong, Chuan-Jian Publication Date: Wed May 04 00:00: Research Org.: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL) Sponsoring Org.: USDOE OSTI Identifier: 15020659 Report Number(s): PNNL-SA-45191 2506 6899 KP1302000 TRN: US0504682 DOE Contract Number: AC05-76RL01830 Resource Type: Journal Article Journal Name: Journal of Materials Chemistry, 15(18):1821-1832 Additional Journal Information: Journal Volume: 15 Journal Issue: 18 Country of Publication: United States Language: English Subject: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS CHEMISTRY COATINGS DETECTION DIFFRACTION GOLD ION EXCHANGE IRON IRON OXIDES LIGANDS MAGNETITE MORPHOLOGY PARTICLE SIZE PLASMONS RESONANCE SURFACE PROPERTIES SYNTHESIS THIN FILMS X-RAY DIFFRACTION X-RAY PHOTOELECTRON SPECTROSCOPY Nanotechnology, nanoparticles Environmental Molecular Sciences =, number = 18, The results have provided important insights into the design of interfacial reactivities via core–shell nanocomposites for magnetic, catalytic and biosensing applications. The interparticle ligand exchange–precipitation chemistry at the gold shell is to our more » knowledge the first example demonstrating the inter-shell reactivity for constructing thin films of Fe particles. In addition to evidence from TEM detection of the change in particle size, UV-Vis observation of the change in the surface plasmon resonance band, and XRD detection of disappearance of the magnetite diffraction peaks after coating the gold shell, the formation of the core–shell morphology was further confirmed by DCP-AES composition analysis of Au and Fe in the molecularly-mediated thin film assembly of Fe particles. The core–shell nanocomposites and assemblies have been characterized using TEM, XRD, XPS, FTIR, TGA, and DCP-AES techniques. The novelty of our assembly strategy is the exploitation of the ligand-exchange reactivity at the gold shells for the thin film assembly of the core–shell nanoparticles. Pre-synthesized and size-defined iron oxide nanoparticles were used as seeding materials for the reduction of gold precursors, which was shown to be effective for coating the iron oxide cores with gold shells (Fe The unique aspect of our synthesis is the formation of Fe core–shell nanoparticles with controllable surface properties. This paper reports findings of an investigation of the synthesis of monolayer-capped iron oxide and core (iron oxide)–shell (gold) nanocomposite and their assembly towards thin film materials.
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