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Title: Electrochemical characterization of organosilane-functionalized nanostructured ITO surfaces

Abstract

The electroactivity of nanostructured indium tin oxide (ITO) has been investigated for its further use in applications such as sensing biological compounds by the analysis of redox active molecules. ITO films were fabricated by using electron beam evaporation at different substrate temperatures and subsequently annealed for promoting their crystallization. The morphology of the deposited material was monitored by scanning electron microscopy, confirming the deposition of either thin films or nanowires, depending on the substrate temperature. Electrochemical surface characterization revealed a 45 % increase in the electroactive surface area of nanostructured ITO with respect to thin films, one third lower than the geometrical surface area variation determined by atomic force microscopy. ITO surfaces were functionalized with a model organic molecule known as 6-(ferrocenyl)hexanethiol. The chemical attachment was done by means of a glycidoxy compound containing a reactive epoxy group, the so-called 3-glycidoxypropyltrimethoxy-silane. ITO functionalization was useful for determining the benefits of nanostructuration on the surface coverage of active molecules. Compared to ITO thin films, an increase in the total peak height of 140 % was observed for as-deposited nanostructured electrodes, whereas the same measurement for annealed electrodes resulted in an increase of more than 400 %. These preliminary results demonstrate the ability of nanostructuredmore » ITO to increase the surface-to-volume ratio, conductivity and surface area functionalization, features that highly benefit the performance of biosensors.« less

Authors:
; ;  [1];  [2];  [2];  [3]; ; ;  [4]
  1. SIC, Departament d'Enginyeries: Electrònica, Universitat de Barcelona, C/ Martí i Franquès 1, E-08028 Barcelona (Spain)
  2. Nanobioengineering Group, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 15-21, E-08028 Barcelona (Spain)
  3. (CIBER-BBN), Monforte de Lemos 3-5 Pabellón 11, E-28029 Madrid (Spain)
  4. MIND-IN"2UB, Departament d'Enginyeries: Electrònica, Universitat de Barcelona, C/ Martí i Franquès 1, E-08028 Barcelona (Spain)
Publication Date:
OSTI Identifier:
22594361
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 109; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; ATOMIC FORCE MICROSCOPY; COMPARATIVE EVALUATIONS; CRYSTALLIZATION; DEPOSITS; ELECTROCHEMISTRY; ELECTRODES; ELECTRON BEAMS; ELECTRONS; EPOXIDES; INDIUM OXIDES; MOLECULES; MORPHOLOGY; NANOWIRES; SCANNING ELECTRON MICROSCOPY; SILANES; SURFACE AREA; SURFACES; THIN FILMS; TIN OXIDES

Citation Formats

Pruna, R., E-mail: rpruna@el.ub.edu, Palacio, F., López, M., Pérez, J., Mir, M., Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina, Blázquez, O., Hernández, S., and Garrido, B.. Electrochemical characterization of organosilane-functionalized nanostructured ITO surfaces. United States: N. p., 2016. Web. doi:10.1063/1.4960734.
Pruna, R., E-mail: rpruna@el.ub.edu, Palacio, F., López, M., Pérez, J., Mir, M., Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina, Blázquez, O., Hernández, S., & Garrido, B.. Electrochemical characterization of organosilane-functionalized nanostructured ITO surfaces. United States. doi:10.1063/1.4960734.
Pruna, R., E-mail: rpruna@el.ub.edu, Palacio, F., López, M., Pérez, J., Mir, M., Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina, Blázquez, O., Hernández, S., and Garrido, B.. Mon . "Electrochemical characterization of organosilane-functionalized nanostructured ITO surfaces". United States. doi:10.1063/1.4960734.
@article{osti_22594361,
title = {Electrochemical characterization of organosilane-functionalized nanostructured ITO surfaces},
author = {Pruna, R., E-mail: rpruna@el.ub.edu and Palacio, F. and López, M. and Pérez, J. and Mir, M. and Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina and Blázquez, O. and Hernández, S. and Garrido, B.},
abstractNote = {The electroactivity of nanostructured indium tin oxide (ITO) has been investigated for its further use in applications such as sensing biological compounds by the analysis of redox active molecules. ITO films were fabricated by using electron beam evaporation at different substrate temperatures and subsequently annealed for promoting their crystallization. The morphology of the deposited material was monitored by scanning electron microscopy, confirming the deposition of either thin films or nanowires, depending on the substrate temperature. Electrochemical surface characterization revealed a 45 % increase in the electroactive surface area of nanostructured ITO with respect to thin films, one third lower than the geometrical surface area variation determined by atomic force microscopy. ITO surfaces were functionalized with a model organic molecule known as 6-(ferrocenyl)hexanethiol. The chemical attachment was done by means of a glycidoxy compound containing a reactive epoxy group, the so-called 3-glycidoxypropyltrimethoxy-silane. ITO functionalization was useful for determining the benefits of nanostructuration on the surface coverage of active molecules. Compared to ITO thin films, an increase in the total peak height of 140 % was observed for as-deposited nanostructured electrodes, whereas the same measurement for annealed electrodes resulted in an increase of more than 400 %. These preliminary results demonstrate the ability of nanostructured ITO to increase the surface-to-volume ratio, conductivity and surface area functionalization, features that highly benefit the performance of biosensors.},
doi = {10.1063/1.4960734},
journal = {Applied Physics Letters},
number = 6,
volume = 109,
place = {United States},
year = {Mon Aug 08 00:00:00 EDT 2016},
month = {Mon Aug 08 00:00:00 EDT 2016}
}