BrainMap

Loredana Preda

PhD

Researcher - INSTITUTUL DE CHIMIE FIZICA - ILIE MURGULESCU

Researcher

Curriculum Vitae (02/04/2025)

Expertise & keywords

Molecular control over single-crystalline GaAs(hkl) surface electronic properties by using bio-thiols Call name: Exploratory Research Projects - PCE-2011 call
PN-II-ID-PCE-2011-3-0304 2012 - 2016

Role in this project: Key expert

Coordinating institution: Institutul de Chimie Fizica Ilie Murgulescu al Academiei Romane

Project partners: Institutul de Chimie Fizica Ilie Murgulescu al Academiei Romane (RO)

Affiliation: Institutul de Chimie Fizica Ilie Murgulescu al Academiei Romane (RO)

Project website: http://www.icf.ro/pr_2011/PN-II-ID-PCE-2011-3-0304.pps

Abstract:

The project aims to explore the control exerted by the adsorbed cysteine over the electronic properties of the GaAs (hkl) surfaces. Beside the thiol group that binds to substrate with high affinity, this small highly polar molecule owns carboxyl and amino functional groups whose intramolecular and intermolecular interactions with themselves or other ions present in its environment play a key role in determining adsorbate conformation and overlayer structure. The complexity of the interfacial phenomena accompanying its binding to GaAs (hkl) requires an interdisciplinary approach. This is mainly achieved by correlating the information concerning the interplay of the semiconductor surface states- and field-effects supplied by electrochemical impedance spectroscopy with that referring to the changes in the surface chemistry furnished by XPS and surface morphology provided by the fractal analysis of the AFM / STM images. UV-VIS-NIR and IR spectroellipsometry investigations on the surface morphology are also considered. Special attention will be focused on pH and doping effects as well as on the influence exerted by the metal cations (e.g. Ca2+/Mg+/ Ni2+), anions (e.g. Cl-) and redox probes (e.g. Fe(CN)63-/4- on the electrochemical properties of the self-assembled monolayer of cysteine on GaAs(hkl) electrodes. Electrochemical response of the cysteine-modified GaAs (hkl) electrodes in the presence of two important neurotransmitters (dopamine / epinephrine) will be also examined.

Electrochemical surface modification using a predefined molecular pattern Call name: Postdoctoral Research Projects - PD-2012 call
PN-II-RU-PD-2012-3-0130 2013 - 2015

Role in this project: Project coordinator

Coordinating institution: INSTITUTUL DE CHIMIE FIZICA - ILIE MURGULESCU

Project partners: INSTITUTUL DE CHIMIE FIZICA - ILIE MURGULESCU (RO)

Affiliation: INSTITUTUL DE CHIMIE FIZICA - ILIE MURGULESCU (RO)

Project website: http://www.icf.ro/pr_2012/PD0130/PN-II-RU-PD-2012-3-0130.html

Abstract:

The first part of project is devoted to the obtaining of bidimensional metallic (Cu/Pd) islands/dithiolate SAMs/GaAs architecture by the under potential deposition metallization of the aliphatic and aromatic dithiolate modified GaAs(hkl) substrate. Such metallic overlayer is expected to induce important changes in the electronic properties of the GaAs(hkl), of potential interest in the microelectronics applications. The second part of the project is devoted to the obtaining a periodic network of one-atom-thick metallic islands of well-defined size extended over the whole surface by electrochemical metallization of CN-modified Pt(111) electrode. Such extended ordered periodic array of metallic bidimensional islands of similar size should exhibit peculiar collective electronic properties as well as ferromagnetic properties, irrespective of the metal used to metallize the adlayer. A regular array of ferromagnetic nanoislands extended over a macroscopic surface, might have many implications in the development of high-density data storage devices. Project will be carried out by combining classical electrochemical techniques (CV, EIS) with surface – sensitive methods such as electrochemical STM, XPS and AFM.

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List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects