Sonochemical Synthesis of Functionalized Amorphous Iron Oxide Nanoparticles

Shafi, Kurikka V. P. M.; Ulman, Abraham; Yan, Xingqing; Yang, Nan; Estournès, Claude; White, Henry; Rafailovich, Miriam

doi:10.1021/la010421+

Cited by 209 publications

(144 citation statements)

References 39 publications

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“…Figure 12 shows the most stable structures derived from the interaction of CPPA with the investigated surfaces (see Supporting Information for the other configurations investigated). First of all we can observe on the (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and (0001)-Zn surfaces a strong H-bonding interaction of the PO termination with a surface hydroxyl group, while on the (10-10) surface this interaction is not active ( Table 2).…”

Section: ■ Experimental Sectionmentioning

confidence: 98%

“…By contrast, the (10-10) surface is slightly less stabilized (−22.6 kcal/mol) The difference in the energy stabilization obtained on the (10-10) surface compared with the other two surfaces (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and (0001) is mainly due to the different H bonding between surface and CPPA molecule (one H bond with PO and with C−O on the (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and (0001)-Zn surfaces and two H bonds with C−O on the (10-10) surface; see Table 2). …”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…CP2K calculations, since are based on a mixed plane-wave and atom-basis centered approach, are not significantly affected by the BSSE (that is correlated only to the atom centered basis set approximation), so it was not taken into account. In particular, it was demonstrated 42 that with the same theoretical approximation (PBE, basis set = MOLOPT 43 and GTH pseudopotential) BSSE represents a very little contribution to Wurtzite crystals are dominated by four low Miller index surfaces ( Figure 3): 44 the nonpolar (10-10) and (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) surfaces and the polar (0001) formed by zinc-terminated (0001) and oxygen-terminated (000-1) islands. 45 In this contest, the ZnO surfaces (0001)-Zn, , and (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) were constructed for the adsorption process using a slab model having a (2 × 2) surface unit cell (see Supporting Information for details).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…In this case, the interaction between CPPA and ZnO surface consists of a double condensation between the two P−O−H terminations and the surface hydroxyl groups on two Zn atoms, leading to a bridging bidentate coordination bonding (structure 2 in Scheme 1). Energetic (ΔG) of single and double condensation of the CPPA molecule has been compared in the case of (10-10), (11)(12)(13)(14)(15)(16)(17)(18)(19)(20), and (0001) surfaces according to reaction 1 and eq 2:…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…DFT calculations were performed to model CPPA anchoring on the hydroxylated (11)(12)(13)(14)(15)(16)(17)(18)(19)(20), , and (0001)-Zn surfaces shown in Figure 11. Details on these surfaces are enclosed in the Supporting Information.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Spectroscopic and Theoretical Study of the Grafting Modes of Phosphonic Acids on ZnO Nanorods

et al. 2013

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Metal oxides are versatile substrates for the design of a wide range of SAM-based organic−inorganic materials among which ZnO nanostructures modified with phosphonic SAM are promising semiconducting systems for applications in technological fields such as biosensing, photonics, and field-effect transistors (FET). Despite previous studies reported on various successful grafting approaches, issues regarding preferred anchoring modes of phosphonic acids and the role of a second reactive group (i.e., a carboxylic group) are still a matter of controversial interpretations. This paper reports on an experimental and theoretical study on the functionalization of ZnO nanorods with monofunctional alkylphosphonic and bifunctional carboxyalkylphosphonic acids. X-ray photoelectron and infrared spectroscopies have been combined with DFT modeling to explain and understand the interactions that drive the surface anchoring of phosphonic acids on ZnO surface. It was found that both monofunctional and bifunctional acids anchor on ZnO through a multidentate bonding which involves both PO and P−O moieties of the phosphonic group. Moreover, anchored bifunctional acids bend to the surface, promoting a further interaction between surface hydroxyl groups and carboxylic terminations. This secondary interaction can be limited by increasing the surface density of the anchored molecules. ■ INTRODUCTIONFunctionalization of metal oxides with self-assembled monolayers (SAMs) is nowadays a field of great interest since it is a powerful and low-cost method to form stable and flexible surfaces with controlled properties. 1−3 Possible applications range from protective coatings which enhance mechanical properties (such as adhesion, friction, and corrosion resistance) 4−6 to functional layers in specific electronics devices such as field-effect transistors, 7,8 sensors, 9−12 or dye-sensitized solar cells (DSSCs). 13 Therefore, the present decade has seen a surge of interest in the modification of metal oxides (TiO 2 , AgO, Al 2 O 3 , ZrO, ZnO, ITO) with SAM having various anchoring groups, among which phosphonic moieties were proven to be an efficient alternative to the more often adopted carboxylic and siloxane tethering functionalities. 14−17 Among mentioned metal oxides, nanostructured ZnO, a wide-band-gap semiconductor (E g = 3.37 eV at room temperature) 18 used in sensors, 19 electronic devices, 20,21 and solar cells, 22−24 is a promising substrate for the design of SAM-based organic− inorganic materials of technological relevance. 25−32 Examples of SAM-functionalized ZnO nanostructures include nanorods modified either with carboxyalkylphosphonic acids (HOOC-(CH 2 ) n P(O)(OH) 2 (n = 2, 9)) for biosensing 25 or with C60-functionalized phosphonic linkers for photonic devices 26 and nanowire-based ZnO field-effect transistors (FET) which use long-chain alkylphosphonic acids as gate dielectrics. 27 Despite various studies reported on a wide range of successful anchoring approaches, issues regarding preferred anchoring modes (monodenta...

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Section: ■ Experimental Sectionmentioning

confidence: 98%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Spectroscopic and Theoretical Study of the Grafting Modes of Phosphonic Acids on ZnO Nanorods

et al. 2013

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Controlled Pyrolysis of Metal‐Containing Precursors as a Way for Synthesis of Metallopolymer Nanocomposites

Pomogailo

Rozenberg

Джардималиева

2004

Metal–Polymer Nanocomposites

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The processes of thermal decomposition play an important role in various practical fields including metallurgy, mineral conversion processes, pyrogenic chemical technology, pyrolysis and thermal treatment of wood and coal, combustion of natural and synthetical fuels, coal carbonization, the prevention of grain spontaneous ignition, and so on. There is still a need for scientifically well-founded approaches to control the thermal decomposition of materials. Many studies focus attention on the chemical transformations and reactions in the pyrolized systems and on the creation of mathematical models of such processes as the major parts of the theory of chemical decomposition of complex substances.Thermolysis is widely used in the synthesis of nano-sized metallopolymer composites. This is a result of the specifics of the preparation of such materials. In spite of a variety of the methods for the preparation of metallopolymer nanocomposites, there are two principal routes: "bottom-up" and "top-down."

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Synthesis of Nanoparticulate Magnetic Materials

Kolesnichenko

2009

Magnetic Nanoparticles

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Most magnetic materials used in today's technology are either metals or metal oxides. From a chemist's point of view, their preparation in bulk form is a simple task, however a bit more challenging aspect relates to phase purity, crystal structure and morphology which are responsible for better performance of these functional materials. The reduction of the crystal dimensionality to the nanometer scale brings a new degree of complexity to their synthesis. The area of science dealing with the development of magnetic nanoparticles, originates from solid-state inorganic chemistry and physics on one hand, and from the colloid and surface chemistry on the other.Ferrofluids, the colloidal dispersions of magnetic iron oxides in hydrocarbon oil, represent probably the first application of magnetic materials in the new form. Their preparation was based on mechanical grinding of the bulk oxide in the presence of surfactant oleic acid and a hydrocarbon solvent. By that time, an alternative approach which originated from the discoveries of colloidal chemistry was introduced, according to which the single metal ion precursors were used in chemical reactions leading to their condensation and subsequent precipitation. This technique was later called ''bottom-up,'' to indicate its fundamental difference from mechanical grinding, and was applied mostly to metal oxides, sulfides, and noble metals. As the theory of magnetism and the discovery of quantum confinement effect ignited a new wave of interest to nanocrystalline inorganic materials, the third approach to synthesis, based on the vapor condensation, was developed.The simplicity of the grinding method may be considered an advantage, but it can be used only (a) for metal oxides because most metals are malleable and (b) for those areas of application, where particle morphology and phase purity are unimportant. The vapor phase condensation methods are superior in terms of phase purity; they also have an advantage when multilayer composites are to be prepared, but they are not competitive in the scaled preparations and when uniform particle morphology is necessary.

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Sonochemical Synthesis of Functionalized Amorphous Iron Oxide Nanoparticles

Cited by 209 publications

References 39 publications

Spectroscopic and Theoretical Study of the Grafting Modes of Phosphonic Acids on ZnO Nanorods

Spectroscopic and Theoretical Study of the Grafting Modes of Phosphonic Acids on ZnO Nanorods

Controlled Pyrolysis of Metal‐Containing Precursors as a Way for Synthesis of Metallopolymer Nanocomposites

Synthesis of Nanoparticulate Magnetic Materials

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