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Papers by Josep Ferré-borrull

Research paper thumbnail of Nanoporous anodic alumina with ohmic contact between substrate and infill: Application to perovskite solar cells

Energy Science & Engineering

Research paper thumbnail of Highly sensitive remote biosensor for the determination of lead (II) ions by using nanoporous anodic alumina modified with DNAzyme

Sensors and Actuators B: Chemical

Research paper thumbnail of Nanoporous Anodic Alumina Platforms for Drug Delivery Applications: Recent Advances and Perspective

Advanced Materials Interfaces

Research paper thumbnail of Optical Detection of Thrombin on Nanoporous Anodic Alumina with Aptamer-Modified Surface

Research paper thumbnail of Tailor-engineered plasmonic single-lattices: harnessing localized surface plasmon resonances for visible-NIR light-enhanced photocatalysis

Catalysis Science & Technology

A platform material composed of 2D gold (Au) nanodot plasmonic single-lattices (Au-nD-PSLs) featu... more A platform material composed of 2D gold (Au) nanodot plasmonic single-lattices (Au-nD-PSLs) featuring tailor-engineered geometric features for visible-NIR light-driven enhanced photocatalysis is presented.

Research paper thumbnail of An optical biosensor for the determination of cathepsin B as a cancer-associated enzyme using nanoporous anodic alumina modified with human serum albumin-thionine

Research paper thumbnail of Highly sensitive IRS based biosensor for the determination of cytochrome c as a cancer marker by using nanoporous anodic alumina modified trypsin

Biosensors and Bioelectronics

Research paper thumbnail of Remote sensing of Salmonella-specific DNA fragment by using nanoporous alumina modified with the single-strand DNA probe

Sensors and Actuators B: Chemical

Research paper thumbnail of Highly sensitive aptasensor based on interferometric reflectance spectroscopy for the determination of amyloid β as an Alzheimer's disease biomarkers using nanoporous anodic alumina

Biosensors and Bioelectronics

Research paper thumbnail of Real-Time Monitoring of Biotinylated Molecules Detection Dynamics in Nanoporous Anodic Alumina for Bio-Sensing

Nanomaterials

The chemical modification, or functionalization, of the surfaces of nanomaterials is a key step t... more The chemical modification, or functionalization, of the surfaces of nanomaterials is a key step to achieve biosensors with the best sensitivity and selectivity. The surface modification of biosensors usually comprises several modification steps that have to be optimized. Real-time monitoring of all the reactions taking place during such modification steps can be a highly helpful tool for optimization. In this work, we propose nanoporous anodic alumina (NAA) functionalized with the streptavidin-biotin complex as a platform towards label-free biosensors. Using reflective interferometric spectroscopy (RIfS), the streptavidin-biotin complex formation, using biotinylated thrombin as a molecule model, was monitored in real-time. The study compared the performance of different NAA pore sizes in order to achieve the highest response. Furthermore, the optimal streptavidin concentration that enabled the efficient detection of the biotinylated thrombin attachment was estimated. Finally, the ab...

Research paper thumbnail of Impact of inkjet printed ZnO electron transport layer on the characteristics of polymer solar cells

RSC Advances

In this paper, we demonstrate that zinc oxide (ZnO) layers deposited by inkjet printing (IJP) can... more In this paper, we demonstrate that zinc oxide (ZnO) layers deposited by inkjet printing (IJP) can be successfully applied to the low-temperature fabrication of efficient inverted polymer solar cells (i-PSCs).

Research paper thumbnail of Nanoporous Anodic Alumina Surface Modification by Electrostatic, Covalent and Immune Complexation Binding Investigated by Capillary Filling

ACS applied materials & interfaces, Jan 6, 2018

The fluid imbibition-coupled laser interferometry (FICLI) technique has been applied to detect an... more The fluid imbibition-coupled laser interferometry (FICLI) technique has been applied to detect and quantify surface changes and pore dimension variations in nanoporous anodic alumina (NAA) structures. FICLI is a non-invasive optical technique that permits the determination of the NAA average pore radius with high accuracy. In this work, the technique is applied after each step of different surface modification paths of the NAA pores: i) electrostatic immobilization of bovine serum albumin, ii) covalent attachment of streptavidin via (3-aminipropyl)-triethoxysilane and glutaraldehyde grafting and iii) immune complexation. Results show that BSA attachment can be detected as a reduction in estimated radius from FICLI with high accuracy and reproducibility. In the case of the covalent attachment of streptavidin, FICLI is able to recognize a multi-layer formation of the silane and of the protein. For immune complexation, the technique is able to detect different antibody-antigen bindings...

Research paper thumbnail of Degradation Analysis of Encapsulated and Nonencapsulated TiO2/PTB7:PC70BM/V2O5 Solar Cells under Ambient Conditions via Impedance Spectroscopy

Research paper thumbnail of Micro- and nanoparticles of mesoporous anodic alumina: Morphological and physicochemical properties

Microporous and Mesoporous Materials

Research paper thumbnail of 3D Nanoporous Anodic Alumina Structures for Sustained Drug Release

Nanomaterials

The use of nanoporous anodic alumina (NAA) for the development of drug delivery systems has gaine... more The use of nanoporous anodic alumina (NAA) for the development of drug delivery systems has gained much attention in recent years. The release of drugs loaded inside NAA pores is complex and depends on the morphology of the pores. In this study, NAA, with different three-dimensional (3D) pore structures (cylindrical pores with several pore diameters, multilayered nanofunnels, and multilayered inverted funnels) were fabricated, and their respective drug delivery rates were studied and modeled using doxorubicin as a model drug. The obtained results reveal optimal modeling of all 3D pore structures, differentiating two drug release stages. Thus, an initial short-term and a sustained long-term release were successfully modeled by the Higuchi and the Korsmeyer-Peppas equations, respectively. This study demonstrates the influence of pore geometries on drug release rates, and further presents a sustained long-term drug release that exceeds 60 days without an undesired initial burst.

Research paper thumbnail of Methods, Properties and Applications of Porous Silicon

Springer Series in Materials Science, 2015

Research paper thumbnail of Design, fabrication and charge recombination analysis of interdigitated heterojunction nanomorphology on P3HT/PC70BM solar cells

Nanoscale, 2015

Fabrication and study of the charge extraction and charge recombination mechanisms for an interdi... more Fabrication and study of the charge extraction and charge recombination mechanisms for an interdigitated heterojunction nanomorphology in P3HT/PC70BM solar cells.

Research paper thumbnail of UV-Optical and microstructural properties of MgF_2- and LaF_3-coatings deposited by IBS and PVD processes

Optical Interference Coatings, 2001

Page 1. UV-Optical and microstructural properties of MgF2-and LaF3-coatings deposited by IBS and ... more Page 1. UV-Optical and microstructural properties of MgF2-and LaF3-coatings deposited by IBS and PVD processes Detlev Ristau7, Stefan Günster7, Salvador Bosch2, Angela Duparré3, Enrico Masetti4, Josep Ferré-Borrull2 ...

Research paper thumbnail of Optical Systems Design and Production

Mixed oxides are useful for obtaining the intermediate refractive indices needed in the realizati... more Mixed oxides are useful for obtaining the intermediate refractive indices needed in the realization of graded-index thin films. Co-evaporated TiO2-SiO2 mixtures are studied for a large range of concentrations via UV-VIS, IR ellipsometry and XPS. An understanding of the nature of these mixtures and their air exposure stability is important for further applications. At low TiO2 concentrations, Ti4+ ions are inserted into the silica tetrahedral network, as shown by the IR peak at 945 cm-1. At higher concentrations, an evolution from TiO4 tetrahedra to TiO6 octahedra is presumed. The behavior of the O1s core level peak indicates that a least two phases coexist. Comparison between concentration determined using XPS and RBS shows a deficit in TiO2 at the surface of the films, especially at high TiO2 concentrations. The evolution of the mixtures optical constants will be presented in a large wavelength range, going from IR to UV. Particular attention will be paid to the variations with res...

Research paper thumbnail of Impact of the 2D-Structured Noise in the Post-Processing of Hybrid Optical-Digital Imaging Systems

International Optical Design, 2006

The effect of the 2D structured noise on the post-processing of images in hybrid optical-digital ... more The effect of the 2D structured noise on the post-processing of images in hybrid optical-digital imaging systems is studied on the basis of the Wiener restoration filter. 2D structured noise is modeled as an additive noise that has the same random value along a row or a column in the image. The restoration is carried out with the Wiener filter in an unsupervised way by the use of well established procedures to determine the filter constant as a function of the noise power. We show that the classical Wiener filter is not satisfactory for the case of systems affected by 2D noise and we conclude that this is caused by an overdetermantion of the 2D noise in the procedure to find the filter constant. From this conclusion we propose a new filter based on the separability of the Optical Transfer Function of the optical system that depends on two constants, one for each principal direction of the 2D noise. Furthermore, we define a procedure for the unsupervised determination of these constants and we evaluate the quality of the restoration obtained by this procedure. .

Research paper thumbnail of Nanoporous anodic alumina with ohmic contact between substrate and infill: Application to perovskite solar cells

Energy Science & Engineering

Research paper thumbnail of Highly sensitive remote biosensor for the determination of lead (II) ions by using nanoporous anodic alumina modified with DNAzyme

Sensors and Actuators B: Chemical

Research paper thumbnail of Nanoporous Anodic Alumina Platforms for Drug Delivery Applications: Recent Advances and Perspective

Advanced Materials Interfaces

Research paper thumbnail of Optical Detection of Thrombin on Nanoporous Anodic Alumina with Aptamer-Modified Surface

Research paper thumbnail of Tailor-engineered plasmonic single-lattices: harnessing localized surface plasmon resonances for visible-NIR light-enhanced photocatalysis

Catalysis Science & Technology

A platform material composed of 2D gold (Au) nanodot plasmonic single-lattices (Au-nD-PSLs) featu... more A platform material composed of 2D gold (Au) nanodot plasmonic single-lattices (Au-nD-PSLs) featuring tailor-engineered geometric features for visible-NIR light-driven enhanced photocatalysis is presented.

Research paper thumbnail of An optical biosensor for the determination of cathepsin B as a cancer-associated enzyme using nanoporous anodic alumina modified with human serum albumin-thionine

Research paper thumbnail of Highly sensitive IRS based biosensor for the determination of cytochrome c as a cancer marker by using nanoporous anodic alumina modified trypsin

Biosensors and Bioelectronics

Research paper thumbnail of Remote sensing of Salmonella-specific DNA fragment by using nanoporous alumina modified with the single-strand DNA probe

Sensors and Actuators B: Chemical

Research paper thumbnail of Highly sensitive aptasensor based on interferometric reflectance spectroscopy for the determination of amyloid β as an Alzheimer's disease biomarkers using nanoporous anodic alumina

Biosensors and Bioelectronics

Research paper thumbnail of Real-Time Monitoring of Biotinylated Molecules Detection Dynamics in Nanoporous Anodic Alumina for Bio-Sensing

Nanomaterials

The chemical modification, or functionalization, of the surfaces of nanomaterials is a key step t... more The chemical modification, or functionalization, of the surfaces of nanomaterials is a key step to achieve biosensors with the best sensitivity and selectivity. The surface modification of biosensors usually comprises several modification steps that have to be optimized. Real-time monitoring of all the reactions taking place during such modification steps can be a highly helpful tool for optimization. In this work, we propose nanoporous anodic alumina (NAA) functionalized with the streptavidin-biotin complex as a platform towards label-free biosensors. Using reflective interferometric spectroscopy (RIfS), the streptavidin-biotin complex formation, using biotinylated thrombin as a molecule model, was monitored in real-time. The study compared the performance of different NAA pore sizes in order to achieve the highest response. Furthermore, the optimal streptavidin concentration that enabled the efficient detection of the biotinylated thrombin attachment was estimated. Finally, the ab...

Research paper thumbnail of Impact of inkjet printed ZnO electron transport layer on the characteristics of polymer solar cells

RSC Advances

In this paper, we demonstrate that zinc oxide (ZnO) layers deposited by inkjet printing (IJP) can... more In this paper, we demonstrate that zinc oxide (ZnO) layers deposited by inkjet printing (IJP) can be successfully applied to the low-temperature fabrication of efficient inverted polymer solar cells (i-PSCs).

Research paper thumbnail of Nanoporous Anodic Alumina Surface Modification by Electrostatic, Covalent and Immune Complexation Binding Investigated by Capillary Filling

ACS applied materials & interfaces, Jan 6, 2018

The fluid imbibition-coupled laser interferometry (FICLI) technique has been applied to detect an... more The fluid imbibition-coupled laser interferometry (FICLI) technique has been applied to detect and quantify surface changes and pore dimension variations in nanoporous anodic alumina (NAA) structures. FICLI is a non-invasive optical technique that permits the determination of the NAA average pore radius with high accuracy. In this work, the technique is applied after each step of different surface modification paths of the NAA pores: i) electrostatic immobilization of bovine serum albumin, ii) covalent attachment of streptavidin via (3-aminipropyl)-triethoxysilane and glutaraldehyde grafting and iii) immune complexation. Results show that BSA attachment can be detected as a reduction in estimated radius from FICLI with high accuracy and reproducibility. In the case of the covalent attachment of streptavidin, FICLI is able to recognize a multi-layer formation of the silane and of the protein. For immune complexation, the technique is able to detect different antibody-antigen bindings...

Research paper thumbnail of Degradation Analysis of Encapsulated and Nonencapsulated TiO2/PTB7:PC70BM/V2O5 Solar Cells under Ambient Conditions via Impedance Spectroscopy

Research paper thumbnail of Micro- and nanoparticles of mesoporous anodic alumina: Morphological and physicochemical properties

Microporous and Mesoporous Materials

Research paper thumbnail of 3D Nanoporous Anodic Alumina Structures for Sustained Drug Release

Nanomaterials

The use of nanoporous anodic alumina (NAA) for the development of drug delivery systems has gaine... more The use of nanoporous anodic alumina (NAA) for the development of drug delivery systems has gained much attention in recent years. The release of drugs loaded inside NAA pores is complex and depends on the morphology of the pores. In this study, NAA, with different three-dimensional (3D) pore structures (cylindrical pores with several pore diameters, multilayered nanofunnels, and multilayered inverted funnels) were fabricated, and their respective drug delivery rates were studied and modeled using doxorubicin as a model drug. The obtained results reveal optimal modeling of all 3D pore structures, differentiating two drug release stages. Thus, an initial short-term and a sustained long-term release were successfully modeled by the Higuchi and the Korsmeyer-Peppas equations, respectively. This study demonstrates the influence of pore geometries on drug release rates, and further presents a sustained long-term drug release that exceeds 60 days without an undesired initial burst.

Research paper thumbnail of Methods, Properties and Applications of Porous Silicon

Springer Series in Materials Science, 2015

Research paper thumbnail of Design, fabrication and charge recombination analysis of interdigitated heterojunction nanomorphology on P3HT/PC70BM solar cells

Nanoscale, 2015

Fabrication and study of the charge extraction and charge recombination mechanisms for an interdi... more Fabrication and study of the charge extraction and charge recombination mechanisms for an interdigitated heterojunction nanomorphology in P3HT/PC70BM solar cells.

Research paper thumbnail of UV-Optical and microstructural properties of MgF_2- and LaF_3-coatings deposited by IBS and PVD processes

Optical Interference Coatings, 2001

Page 1. UV-Optical and microstructural properties of MgF2-and LaF3-coatings deposited by IBS and ... more Page 1. UV-Optical and microstructural properties of MgF2-and LaF3-coatings deposited by IBS and PVD processes Detlev Ristau7, Stefan Günster7, Salvador Bosch2, Angela Duparré3, Enrico Masetti4, Josep Ferré-Borrull2 ...

Research paper thumbnail of Optical Systems Design and Production

Mixed oxides are useful for obtaining the intermediate refractive indices needed in the realizati... more Mixed oxides are useful for obtaining the intermediate refractive indices needed in the realization of graded-index thin films. Co-evaporated TiO2-SiO2 mixtures are studied for a large range of concentrations via UV-VIS, IR ellipsometry and XPS. An understanding of the nature of these mixtures and their air exposure stability is important for further applications. At low TiO2 concentrations, Ti4+ ions are inserted into the silica tetrahedral network, as shown by the IR peak at 945 cm-1. At higher concentrations, an evolution from TiO4 tetrahedra to TiO6 octahedra is presumed. The behavior of the O1s core level peak indicates that a least two phases coexist. Comparison between concentration determined using XPS and RBS shows a deficit in TiO2 at the surface of the films, especially at high TiO2 concentrations. The evolution of the mixtures optical constants will be presented in a large wavelength range, going from IR to UV. Particular attention will be paid to the variations with res...

Research paper thumbnail of Impact of the 2D-Structured Noise in the Post-Processing of Hybrid Optical-Digital Imaging Systems

International Optical Design, 2006

The effect of the 2D structured noise on the post-processing of images in hybrid optical-digital ... more The effect of the 2D structured noise on the post-processing of images in hybrid optical-digital imaging systems is studied on the basis of the Wiener restoration filter. 2D structured noise is modeled as an additive noise that has the same random value along a row or a column in the image. The restoration is carried out with the Wiener filter in an unsupervised way by the use of well established procedures to determine the filter constant as a function of the noise power. We show that the classical Wiener filter is not satisfactory for the case of systems affected by 2D noise and we conclude that this is caused by an overdetermantion of the 2D noise in the procedure to find the filter constant. From this conclusion we propose a new filter based on the separability of the Optical Transfer Function of the optical system that depends on two constants, one for each principal direction of the 2D noise. Furthermore, we define a procedure for the unsupervised determination of these constants and we evaluate the quality of the restoration obtained by this procedure. .