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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Investigation of electronic and chemical sensitization effects promoted by Pt and Pd nanoparticles on single-crystalline SnO nanobelt-based gas sensors

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Barbosa, Martin S. [1] ; Suman, Pedro H. [2, 1] ; Kim, Jae J. [2] ; Tuller, Harry L. [2] ; Orlandi, Marcelo O. [1]
Total Authors: 5
[1] Sao Paulo State Univ, Dept Phys Chem, BR-14800900 Araraquara, SP - Brazil
[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 - USA
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 3

This work reports on the gas sensor response of undecorated 1D stannous oxide nanobelts and those decorated with Pt and Pd nanoparticles. The sensor device responses to H-2, CO and NO2 were measured in dry air baseline atmosphere as functions of the analyte concentration (1-1000 ppm) and temperature (100-350 degrees C). Noble metal decorated SnO devices exhibited enhanced chemical sensitization, resulting in increased sensitivity upon exposure to reducing gases at different working temperatures. Differences in enhancement levels are attributed to strong electronic sensitization effects that are dependent on the respective Pt and Pd work functions and the unique SnO band structure, characterized by a small band gap. Gas sensing results also showed superior selectivity to H-2 for metal-decorated nanobelts. Based on the findings in this work, we propose an array based on SnO structures capable of detecting and distinguishing reducing and oxidizing gases. (AU)

FAPESP's process: 12/51195-3 - Modeling effects of sensor response of semiconducting oxide with functionalized nanoparticles
Grantee:José Arana Varela
Support type: Regular Research Grants
FAPESP's process: 13/18511-1 - Chemical sensor characterization of pure and hybrid nanostructured materials based on tin oxide
Grantee:Pedro Henrique Suman
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 13/08734-3 - Study of modified tin oxide based structures as gas sensors.
Grantee:Martin Schwellberger Barbosa
Support type: Scholarships in Brazil - Master
FAPESP's process: 14/50725-4 - Gas sensor response of thin films: impact of p-n junctions
Grantee:José Arana Varela
Support type: Regular Research Grants