Macroporous indium tin oxide electrode layers as conducting substrates for immobilization of bulky electroactive guests

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F14%3A00506901" target="_blank" >RIV/61388955:_____/14:00506901 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0298039" target="_blank" >http://hdl.handle.net/11104/0298039</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.electacta.2014.05.046" target="_blank" >10.1016/j.electacta.2014.05.046</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Macroporous indium tin oxide electrode layers as conducting substrates for immobilization of bulky electroactive guests

Popis výsledku v původním jazyce

Macroporous indium tin oxide (ITO) electrodes with a defined uniform pore size were prepared via direct co-assembly of ultra-small indium tin hydroxide (nano-ITOH) nanoparticles and poly(methyl methacrylate) (PMMA) beads. The use of nano-ITOH nanoparticles enables a facile large-scale fabrication of homogeneous crack-free coatings with good adhesion to the substrate, good optical quality and tunable thickness, which easily transform at 400 degrees C into crystalline ITO with similar morphology. Macroporous ITO films exhibit reasonably high electric conductivity of 4.0 +/- 0.3 S cm(-1) and open interconnected pores with a uniform size of ca. 300 nm, which makes them suitable conducting platforms for immobilization of bulky redox species or for deposition of functional electroactive layers. Deposition of functional semiconducting layers on the walls of the porous ITO scaffold was shown for titanium dioxide, which penetrates the ITO framework as shown by transmission electron microscopy (TEM) analysis of a cross-section. The obtained layers were used as conducting substrates for the immobilization of the heme proteins cytochrome c and hemoglobin, which demonstrate a direct electron transfer to the macroporous ITO electrode. Surface coverage of cytochrome c adsorbed on the macroporous ITO electrode is more than 12 times higher than on a planar one, reaching 400 pmol cm(-2) for a film of ca. 360 nm in thickness. Hemoglobin adsorbed on the macroporous ITO electrodes also demonstrates a noticeably high surface coverage of ca. 160 +/- 20 pmol cm(-2), which is roughly 7-10 times higher than the theoretical value for monolayer coverage. (C) 2014 Elsevier Ltd. All rights reserved.

Název v anglickém jazyce

Macroporous indium tin oxide electrode layers as conducting substrates for immobilization of bulky electroactive guests

Popis výsledku anglicky

Macroporous indium tin oxide (ITO) electrodes with a defined uniform pore size were prepared via direct co-assembly of ultra-small indium tin hydroxide (nano-ITOH) nanoparticles and poly(methyl methacrylate) (PMMA) beads. The use of nano-ITOH nanoparticles enables a facile large-scale fabrication of homogeneous crack-free coatings with good adhesion to the substrate, good optical quality and tunable thickness, which easily transform at 400 degrees C into crystalline ITO with similar morphology. Macroporous ITO films exhibit reasonably high electric conductivity of 4.0 +/- 0.3 S cm(-1) and open interconnected pores with a uniform size of ca. 300 nm, which makes them suitable conducting platforms for immobilization of bulky redox species or for deposition of functional electroactive layers. Deposition of functional semiconducting layers on the walls of the porous ITO scaffold was shown for titanium dioxide, which penetrates the ITO framework as shown by transmission electron microscopy (TEM) analysis of a cross-section. The obtained layers were used as conducting substrates for the immobilization of the heme proteins cytochrome c and hemoglobin, which demonstrate a direct electron transfer to the macroporous ITO electrode. Surface coverage of cytochrome c adsorbed on the macroporous ITO electrode is more than 12 times higher than on a planar one, reaching 400 pmol cm(-2) for a film of ca. 360 nm in thickness. Hemoglobin adsorbed on the macroporous ITO electrodes also demonstrates a noticeably high surface coverage of ca. 160 +/- 20 pmol cm(-2), which is roughly 7-10 times higher than the theoretical value for monolayer coverage. (C) 2014 Elsevier Ltd. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Electrochimica acta

ISSN

0013-4686

e-ISSN

—

Svazek periodika

140

Číslo periodika v rámci svazku

SEP 2014

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

108-115

Kód UT WoS článku

000342528600016

EID výsledku v databázi Scopus

2-s2.0-84907968566