Nanostructured copper oxides and phosphates from a new solid-state route
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Accepted Version
Date
2011-07-23
Authors
Díaz, Carlos
Valenzuela, María Luisa
Lavayen, Vladimir
Mendoza, K.
Peña, D. O.
O'Dwyer, Colm
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Published Version
Abstract
Nanostructured copper containing materials of CuO, Cu3(PO4)3 and Cu2P2O7 have been prepared by solid-state pyrolysis of molecular CuCl2·NC5H4OH (I), CuCl2·CNCH2C6H4OH (II), oligomeric [Cu(PPh3)Cl]4 (III), N3P3[OC6H4CH2CN·CuCl]6[PF6] (IV), N3P3[OC6H5]5[OC5H4N·Cu][PF6] (V), polymeric chitosan·(CuCl2)n (VI) and polystyrene-co-4-vinylpyridine PS-b-4-PVP·(CuCl2) (VII) precursors. The products strongly depend on the precursor used. The pyrolytic products from phosphorus-containing precursors (III), (IV) and (V) are Cu phosphates or pyrophosphates, while non-phosphorous-containing precursors (VI) and (VII), result in mainly CuO. The use of chitosan as a solid-state template/stabilizer induces the formation of CuO and Cu2O nanoparticles. Copper pyrophosphate (Cu2P2O7) deposited on Si using (IV) as the precursor exhibits single-crystal dots of average diameter 100 nm and heights equivalent to twice the unit cell b-axis (1.5–1.7 nm) and an areal density of 5.1–7.7 Gigadots/in.2. Cu2P2O7 deposited from precursor (VI) exhibits unique labyrinthine high surface area deposits. The morphology of CuO deposited on Si from pyrolysis of (VI) depends on the polymer/Cu meta ratio. Magnetic measurements performed using SQUID on CuO nanoparticle networks suggest superparamagnetic behavior. The results give insights into compositional, shape and morphological control of the as-formed nanostructures through the structure of the precursors.
Description
Keywords
Nanoparticles , Copper oxides , Phosphazenes , Pyrolysis organometallics , Surface deposition , Phosphates
Citation
Diaz, C.,Valenzuela, M. L., Lavayen, V., Mendoza, K.,Pena, D. O.,O'Dwyer, C. (2011) 'Nanostructured copper oxides and phosphates from a new solid-state route', Inorganica Chimica Acta, 377, pp. 5-13. http://www.sciencedirect.com/science/article/pii/S0020169311005743