T. Ignat - Academia.edu (original) (raw)

Papers by T. Ignat

Porous silicon (PS) is a nanostructured material based on silicon, fabricated using an electroche... more Porous silicon (PS) is a nanostructured material based on silicon, fabricated using an electrochemical process that can be used for a broad spectrum of applications, from optoelectronic to biomedicine. In this paper there are presented the fabrication processes of microelement monolithic reservoirs using PS matrix; two impregnation processes of porous structure with iron ions or iron oxides have been studied: iron electrochemical deposition and iron salts deposition and melting, both followed by thermal treatments. The test structures were analyzed from morphological and compositional point of view and the measurements reveal that the iron compounds are distributed both inside the pores network and in the Si skeleton.

Proceedings. The 16th International Conference on Microelectronics, 2004. ICM 2004., 2004

Micro fluidic Biochip for Bio-medical Application ... Monica Simion, Anca Angelescu, Irina Kleps,... more Micro fluidic Biochip for Bio-medical Application ... Monica Simion, Anca Angelescu, Irina Kleps, Mhaela Miu, Marioara Avram, Florea Craciunoiu, Teodora Ignat, Adina Bragam ... Notional Institute for Research and Development in Microtechnologies, Laboratoty of ...

Fuel Cells, 2010

Platinum nanocatalysts were deposited on / inside of nanostructured silicon (nanoSi) matrix using... more Platinum nanocatalysts were deposited on / inside of nanostructured silicon (nanoSi) matrix using physico -chemical methods, e.i. E-beam high vacuum Pt thin film and respectively chemically loaded Pt nanoparticles from hexachloroplatinic acid aqueous or alcoholic precursor solutions. High resolution morphological characterisations, completed by microstructural and compositional analyses have been performed to characterise the nanoSi catalyst support and to investigate the Pt thin film nanostructuration as well as the nanoparticle attachment and clustering processes, evidencing the controlling factors and conditions of the size, morphology and distribution. Furthermore, the experimental structures have been subjected to different electrochemical tests and it was revealed that significant improvement of the long term catalyst stability was achieved when the metal-porous silicon nanoassemblies is formed, which represents a step closer to the realization of the monolithic integrated Si-based microfabricated fuel cell.

2009 International Semiconductor Conference, 2009

The aim of this work is to prepare a multilayer polyelectrolyte film using layer-by-layer techniq... more The aim of this work is to prepare a multilayer polyelectrolyte film using layer-by-layer technique (LbL), by sequentially immersing of a Nafion 117 membrane in positively and then negatively charged polyelectrolyte solutions in a cyclic procedure, based on the electrostatic attraction between opposite charges polyelectrolytes. Poly (sodium styrene sulfonate) - PSS has been used as polyanionic solution and poly (diallyldimethylammonium

CAS 2005 Proceedings. 2005 International Semiconductor Conference, 2005., 2005

The gold nanocrystallites orientation on nanocrystalline silicon substrates is of great interest ... more The gold nanocrystallites orientation on nanocrystalline silicon substrates is of great interest for applications in biochemistry; the Au (III)/nc-Si surface has a higher density of atoms comparatively with Ai(100); this favors the attachment of a higher number of atoms and biomolecules on the gold surface. In this paper the variation of the gold structural characteristics on different Si nanocomposite layers,

Superlattices and Microstructures, 2009

Nanoparticles of noble metals, such as gold and silver, exhibit unique and tunable optical proper... more Nanoparticles of noble metals, such as gold and silver, exhibit unique and tunable optical properties on account of their surface plasmon resonance. In particular, gold nanoparticles on silicon substrates are attractive for future nanoscale sensors and optical devices due to their resistance to ...

Journal of Alloys and Compounds, 2010

Porous silicon (PS) is a nanostructured material based on silicon, fabricated using an electroche... more Porous silicon (PS) is a nanostructured material based on silicon, fabricated using an electrochemical process that can be used for a broad spectrum of applications, from optoelectronic to biomedicine. In this paper there are presented the fabrication processes of microelement monolithic reservoirs using PS matrix; two impregnation processes of porous structure with iron ions or iron oxides have been studied: iron electrochemical deposition and iron salts deposition and melting, both followed by thermal treatments. The test structures were analyzed from morphological and compositional point of view and the measurements reveal that the iron compounds are distributed both inside the pores network and in the Si skeleton.

…, 2004

National Institutc for Research and Development in Microtechnologies (IMT), POBox 38-160, Buchare... more National Institutc for Research and Development in Microtechnologies (IMT), POBox 38-160, Bucharest, Romania, fix: 40.1.4908238, tel.: 40.1.4908412/33, E-mail: mihaelam@imt.ro * Institute of Biochemistry, Bucharest, Romania, Splaiul Independentei 296, fax :40.1.2239069, tel: ...

2008 International Semiconductor Conference, 2008

National Institute for Research and Development in Microtechnologies (IMT - Bucharest) Str. Erou ... more National Institute for Research and Development in Microtechnologies (IMT - Bucharest) Str. Erou Iancu Nicolae 32B, 72996 Bucharest, Romania, Phone: +40214908085; Fax: +40214908238 *University of Bucharest, Department of Organic Chemistry, M. Kogalniceanu str., ...

Porous silicon (PS) is a nanostructured material based on silicon, fabricated using an electroche... more Porous silicon (PS) is a nanostructured material based on silicon, fabricated using an electrochemical process that can be used for a broad spectrum of applications, from optoelectronic to biomedicine. In this paper there are presented the fabrication processes of microelement monolithic reservoirs using PS matrix; two impregnation processes of porous structure with iron ions or iron oxides have been studied: iron electrochemical deposition and iron salts deposition and melting, both followed by thermal treatments. The test structures were analyzed from morphological and compositional point of view and the measurements reveal that the iron compounds are distributed both inside the pores network and in the Si skeleton.

Proceedings. The 16th International Conference on Microelectronics, 2004. ICM 2004., 2004

Micro fluidic Biochip for Bio-medical Application ... Monica Simion, Anca Angelescu, Irina Kleps,... more Micro fluidic Biochip for Bio-medical Application ... Monica Simion, Anca Angelescu, Irina Kleps, Mhaela Miu, Marioara Avram, Florea Craciunoiu, Teodora Ignat, Adina Bragam ... Notional Institute for Research and Development in Microtechnologies, Laboratoty of ...

Fuel Cells, 2010

Platinum nanocatalysts were deposited on / inside of nanostructured silicon (nanoSi) matrix using... more Platinum nanocatalysts were deposited on / inside of nanostructured silicon (nanoSi) matrix using physico -chemical methods, e.i. E-beam high vacuum Pt thin film and respectively chemically loaded Pt nanoparticles from hexachloroplatinic acid aqueous or alcoholic precursor solutions. High resolution morphological characterisations, completed by microstructural and compositional analyses have been performed to characterise the nanoSi catalyst support and to investigate the Pt thin film nanostructuration as well as the nanoparticle attachment and clustering processes, evidencing the controlling factors and conditions of the size, morphology and distribution. Furthermore, the experimental structures have been subjected to different electrochemical tests and it was revealed that significant improvement of the long term catalyst stability was achieved when the metal-porous silicon nanoassemblies is formed, which represents a step closer to the realization of the monolithic integrated Si-based microfabricated fuel cell.

2009 International Semiconductor Conference, 2009

The aim of this work is to prepare a multilayer polyelectrolyte film using layer-by-layer techniq... more The aim of this work is to prepare a multilayer polyelectrolyte film using layer-by-layer technique (LbL), by sequentially immersing of a Nafion 117 membrane in positively and then negatively charged polyelectrolyte solutions in a cyclic procedure, based on the electrostatic attraction between opposite charges polyelectrolytes. Poly (sodium styrene sulfonate) - PSS has been used as polyanionic solution and poly (diallyldimethylammonium

CAS 2005 Proceedings. 2005 International Semiconductor Conference, 2005., 2005

The gold nanocrystallites orientation on nanocrystalline silicon substrates is of great interest ... more The gold nanocrystallites orientation on nanocrystalline silicon substrates is of great interest for applications in biochemistry; the Au (III)/nc-Si surface has a higher density of atoms comparatively with Ai(100); this favors the attachment of a higher number of atoms and biomolecules on the gold surface. In this paper the variation of the gold structural characteristics on different Si nanocomposite layers,

Superlattices and Microstructures, 2009

Nanoparticles of noble metals, such as gold and silver, exhibit unique and tunable optical proper... more Nanoparticles of noble metals, such as gold and silver, exhibit unique and tunable optical properties on account of their surface plasmon resonance. In particular, gold nanoparticles on silicon substrates are attractive for future nanoscale sensors and optical devices due to their resistance to ...

Journal of Alloys and Compounds, 2010

Porous silicon (PS) is a nanostructured material based on silicon, fabricated using an electroche... more Porous silicon (PS) is a nanostructured material based on silicon, fabricated using an electrochemical process that can be used for a broad spectrum of applications, from optoelectronic to biomedicine. In this paper there are presented the fabrication processes of microelement monolithic reservoirs using PS matrix; two impregnation processes of porous structure with iron ions or iron oxides have been studied: iron electrochemical deposition and iron salts deposition and melting, both followed by thermal treatments. The test structures were analyzed from morphological and compositional point of view and the measurements reveal that the iron compounds are distributed both inside the pores network and in the Si skeleton.

…, 2004

National Institutc for Research and Development in Microtechnologies (IMT), POBox 38-160, Buchare... more National Institutc for Research and Development in Microtechnologies (IMT), POBox 38-160, Bucharest, Romania, fix: 40.1.4908238, tel.: 40.1.4908412/33, E-mail: mihaelam@imt.ro * Institute of Biochemistry, Bucharest, Romania, Splaiul Independentei 296, fax :40.1.2239069, tel: ...

2008 International Semiconductor Conference, 2008

National Institute for Research and Development in Microtechnologies (IMT - Bucharest) Str. Erou ... more National Institute for Research and Development in Microtechnologies (IMT - Bucharest) Str. Erou Iancu Nicolae 32B, 72996 Bucharest, Romania, Phone: +40214908085; Fax: +40214908238 *University of Bucharest, Department of Organic Chemistry, M. Kogalniceanu str., ...