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Dive into the research topics where I. Preda is active.

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Featured researches published by I. Preda.


Current Nanoscience | 2011

Surface Functionalization of Nanostructured Porous Silicon by APTS: Toward the Fabrication of Electrical Biosensors of Bacterium Escherichia coli

Gonzalo Recio-Sánchez; G. Domínguez-Cañizares; Miguel Manso; I. Preda; V. Torres-Costa; A. Gutiérrez; L. Soriano; Raúl J. Martín-Palma

Nanostructured porous silicon (nanoPS) basically consists in a network of silicon nanocrystals with high specific surface. Its intrinsic high surface reactivity makes nanoPS a very suitable material for the development of biosensors. In this work, the surface of nanoPS was functionalized by the use of (3-aminopropyl)triethoxysilane solutions in toluene. Escherichia coli (E. coli) antibodies were subsequently immobilized on the functionalized surfaces. Finally, fragments of this bacterium, which are specifically recognized by the antibodies, were immobilized. Moreover, devices with a metal/nanoPS/semiconductor/metal structure were fabricated aiming at the electrical biosensing of E. Coli bacterium. The experimental results showed a strong variation of the current as a function of the presence/absence of bacterium E. Coli and surface concentration.


Journal of Synchrotron Radiation | 2013

X-ray absorption study of the local structure at the NiO/oxide interfaces

I. Preda; L. Soriano; Daniel Díaz-Fernández; G. Domínguez-Cañizares; A. Gutiérrez; Germán R. Castro; J. Chaboy

This work reports an X-ray absorption near-edge structure (XANES) spectroscopy study at the Ni K-edge in the early stages of growth of NiO on non-ordered SiO2, Al2O3 and MgO thin films substrates. Two different coverages of NiO on the substrates have been studied. The analysis of the XANES region shows that for high coverages (80 Eq-ML) the spectra are similar to that of bulk NiO, being identical for all substrates. In contrast, for low coverages (1 Eq-ML) the spectra differ from that of large coverages indicating that the local order around Ni is limited to the first two coordination shells. In addition, the results also suggest the formation of cross-linking bonds Ni-O-M (M = Si, Al, Mg) at the interface.


Physical Review B | 2007

Surface effects in the Ni 2p x-ray photoemission spectra of NiO

L. Soriano; I. Preda; A. Gutiérrez; S. Palacín; M. Abbate; A. Vollmer


Physical Review B | 2008

Interface effects in the Ni 2 p x-ray photoelectron spectra of NiO thin films grown on oxide substrates

I. Preda; A. Gutiérrez; M. Abbate; F. Yubero; Javier Méndez; L. Alvarez; L. Soriano


Surface Science | 2012

Surface contributions to the XPS spectra of nanostructured NiO deposited on HOPG

I. Preda; R.J.O. Mossanek; M. Abbate; L. Alvarez; J. Méndez; A. Gutiérrez; L. Soriano


Chemical Physics Letters | 2011

Investigation of surface and non-local screening effects in the Ni 2p core level photoemission spectra of NiO

R.J.O. Mossanek; I. Preda; M. Abbate; J. Rubio-Zuazo; Germán R. Castro; A. Vollmer; A. Gutiérrez; L. Soriano


Physical Review B | 2006

Splitting of Ni 3 d states at the surface of NiO nanostructures

L. Soriano; A. Gutiérrez; I. Preda; S. Palacín; J. M. Sanz; M. Abbate; J. F. Trigo; A. Vollmer; P. R. Bressler


Journal of Physical Chemistry C | 2010

Growth and structure of self-assembled monolayers of a TTF derivative on Au(111)

Christian Urban; David Ecija; Yang Wang; Marta Trelka; I. Preda; Antje Vollmer; Nicolás Lorente; A. Arnau; Manuel Alcamí; L. Soriano; Nazario Martín; Fernando Martín; Roberto Otero; José M. Gallego; R. Miranda


Journal of Electron Spectroscopy and Related Phenomena | 2007

Study of the growth of NiO on highly oriented pyrolytic graphite by X-ray absorption spectroscopy

I. Preda; M. Abbate; A. Gutiérrez; S. Palacín; A. Vollmer; L. Soriano


Applied Surface Science | 2007

Core-level electronic properties of nanostructured NiO coatings

S. Palacín; A. Gutiérrez; I. Preda; M. Hernández-Vélez; R. Sanz; José Antonio Jiménez; L. Soriano

Collaboration


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L. Soriano

Autonomous University of Madrid

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A. Gutiérrez

Autonomous University of Madrid

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M. Abbate

Federal University of Paraná

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S. Palacín

Autonomous University of Madrid

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A. Vollmer

Helmholtz-Zentrum Berlin

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L. Alvarez

Spanish National Research Council

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F. Yubero

Spanish National Research Council

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G. Domínguez-Cañizares

Autonomous University of Madrid

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Germán R. Castro

Spanish National Research Council

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J. M. Sanz

Spanish National Research Council

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