Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection
In the present study, Au-surfactant core-shell colloidal nanoparticles (NPs) with controlled dimension and composition were synthesized by sacrificial anode electrolysis. Transmission electron microscopy (TEM) revealed that Au NPs core diameter is between 8 and 12 nm, as a function of the electrosy...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2014-10-01
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| Series: | Journal of Sensors and Sensor Systems |
| Online Access: | http://www.j-sens-sens-syst.net/3/245/2014/jsss-3-245-2014.pdf |
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| author | E. Dilonardo M. Penza M. Alvisi C. Di Franco D. Suriano R. Rossi F. Palmisano L. Torsi N. Cioffi |
| author_facet | E. Dilonardo M. Penza M. Alvisi C. Di Franco D. Suriano R. Rossi F. Palmisano L. Torsi N. Cioffi |
| author_sort | E. Dilonardo |
| collection | DOAJ |
| description | In the present study, Au-surfactant core-shell colloidal nanoparticles (NPs)
with controlled dimension and composition were synthesized by sacrificial
anode electrolysis. Transmission electron microscopy (TEM) revealed that Au NPs
core diameter is between 8 and 12 nm, as a function of the
electrosynthesis conditions. Moreover, surface spectroscopic
characterization by X-ray photoelectron spectroscopy (XPS) analysis confirmed the presence of nanosized gold
phase. Controlled amounts of Au NPs were then deposited electrophoretically
on carbon nanotube (CNT) networked films. The resulting hybrid materials
were morphologically and chemically characterized using TEM, SEM (scanning electron microscopy) and XPS
analyses, which revealed the presence of nanoscale gold, and its successful
deposition on CNTs. Au NP/CNT networked films were tested as active layers
in a two-pole resistive NO<sub>2</sub> sensor for sub-ppm detection in the
temperature range of 100–200 °C. Au NP/CNT exhibited a p-type
response with a decrease in the electrical resistance upon exposure to
oxidizing NO<sub>2</sub> gas and an increase in resistance upon exposure to
reducing gases (e.g. NH<sub>3</sub>). It was also demonstrated that the
sensitivity of the Au NP/CNT-based sensors depends on Au loading; therefore,
the impact of the Au loading on gas sensing performance was investigated as
a function of the working temperature, gas concentration and interfering
gases. |
| first_indexed | 2024-04-14T05:50:22Z |
| format | Article |
| id | doaj.art-6163d79f19bb4453bd73a360c9dd9011 |
| institution | Directory Open Access Journal |
| issn | 2194-8771 2194-878X |
| language | English |
| last_indexed | 2024-04-14T05:50:22Z |
| publishDate | 2014-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Journal of Sensors and Sensor Systems |
| spelling | doaj.art-6163d79f19bb4453bd73a360c9dd90112022-12-22T02:09:08ZengCopernicus PublicationsJournal of Sensors and Sensor Systems2194-87712194-878X2014-10-013224525210.5194/jsss-3-245-2014Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detectionE. Dilonardo0M. Penza1M. Alvisi2C. Di Franco3D. Suriano4R. Rossi5F. Palmisano6L. Torsi7N. Cioffi8Department of Chemistry, Università degli Studi di Bari Aldo Moro, Bari, ItalyENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Technical Unit for Materials Technologies – Brindisi Research Center, Brindisi, ItalyENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Technical Unit for Materials Technologies – Brindisi Research Center, Brindisi, ItalyCNR-IFN Bari, Bari, ItalyENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Technical Unit for Materials Technologies – Brindisi Research Center, Brindisi, ItalyENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Technical Unit for Materials Technologies – Brindisi Research Center, Brindisi, ItalyDepartment of Chemistry, Università degli Studi di Bari Aldo Moro, Bari, ItalyDepartment of Chemistry, Università degli Studi di Bari Aldo Moro, Bari, ItalyDepartment of Chemistry, Università degli Studi di Bari Aldo Moro, Bari, ItalyIn the present study, Au-surfactant core-shell colloidal nanoparticles (NPs) with controlled dimension and composition were synthesized by sacrificial anode electrolysis. Transmission electron microscopy (TEM) revealed that Au NPs core diameter is between 8 and 12 nm, as a function of the electrosynthesis conditions. Moreover, surface spectroscopic characterization by X-ray photoelectron spectroscopy (XPS) analysis confirmed the presence of nanosized gold phase. Controlled amounts of Au NPs were then deposited electrophoretically on carbon nanotube (CNT) networked films. The resulting hybrid materials were morphologically and chemically characterized using TEM, SEM (scanning electron microscopy) and XPS analyses, which revealed the presence of nanoscale gold, and its successful deposition on CNTs. Au NP/CNT networked films were tested as active layers in a two-pole resistive NO<sub>2</sub> sensor for sub-ppm detection in the temperature range of 100–200 °C. Au NP/CNT exhibited a p-type response with a decrease in the electrical resistance upon exposure to oxidizing NO<sub>2</sub> gas and an increase in resistance upon exposure to reducing gases (e.g. NH<sub>3</sub>). It was also demonstrated that the sensitivity of the Au NP/CNT-based sensors depends on Au loading; therefore, the impact of the Au loading on gas sensing performance was investigated as a function of the working temperature, gas concentration and interfering gases.http://www.j-sens-sens-syst.net/3/245/2014/jsss-3-245-2014.pdf |
| spellingShingle | E. Dilonardo M. Penza M. Alvisi C. Di Franco D. Suriano R. Rossi F. Palmisano L. Torsi N. Cioffi Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection Journal of Sensors and Sensor Systems |
| title | Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection |
| title_full | Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection |
| title_fullStr | Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection |
| title_full_unstemmed | Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection |
| title_short | Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection |
| title_sort | electrophoretic deposition of au nps on cnt networks for sensitive no sub 2 sub detection |
| url | http://www.j-sens-sens-syst.net/3/245/2014/jsss-3-245-2014.pdf |
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