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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.)

UV-assisted chemiresistors made with gold-modified ZnO nanorods to detect ozone gas at room temperature

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Author(s):
Joshi, Nirav [1, 2] ; da Silva, Luis F. [3] ; Shimizu, Flavio M. [1, 4] ; Mastelaro, Valmor R. [1] ; M'Peko, Jean-Claude [1] ; Lin, Liwei [2] ; Oliveira, Jr., Osvaldo N. [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 - USA
[3] Univ Fed Sao Carlos, Dept Phys, Rodovia Washington Luis Km 235, BR-13565905 Sao Carlos, SP - Brazil
[4] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Microchimica Acta; v. 186, n. 7 JUL 2019.
Web of Science Citations: 2
Abstract

Two kinds of flexible ozone (O-3) sensors were obtained by placing pristine ZnO nanorods and gold-modified ZnO nanorods (NRs) on a bi-axially oriented poly(ethylene terephthalate) substrate. The chemiresistive sensor is operated at typically 1V at room temperature under the UV-light illumination. The ZnO nanorods were prepared via a hydrothermal route and have a highly crystalline wurtzite structure, with diameters ranging between 70 and 300nm and a length varying from 1 to 3m. The ZnO NRs were then coated with a ca. 10nm gold layer whose presence was confirmed with microscopy analysis. This sensor is found to be superior to detect ozone at a room temperature. Typical figures of merit include (a) a sensor response of 108 at 30ppb ozone for gold-modified ZnO NRs, and (b) a linear range that extends from 30 to 570ppb. The sensor is stable, reproducible and selective for O-3 compared to other oxidizing and reducing gases. The enhanced performance induced by the modification of ZnO nanorods with thin layer of gold is attributed to the increased reaction kinetics compared to pristine ZnO NRs. The sensing mechanism is assumed to be based on the formation of a nano-Schottky type barrier junction at the interface between gold and ZnO. (AU)

FAPESP's process: 13/14262-7 - Nanostructured films from biologically-relevant materials
Grantee:Osvaldo Novais de Oliveira Junior
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 16/23474-6 - Nanomaterial-based heterostructures: synthesis and their gas sensing properties
Grantee:Niravkumar Jitendrabhai Joshi
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 14/23546-1 - Enhanced sensitive and selective sensors made with p-NiO nanowire/n-ZnO Nanowire heterostructures
Grantee:Niravkumar Jitendrabhai Joshi
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 12/15543-7 - Biosensors to detect Escherichia coli using the concept of an extended electronic tongue
Grantee:Flavio Makoto Shimizu
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 17/12437-5 - Preparation and characterization of semiconductor nanoheterojunctions applied in photoactived gas sensors
Grantee:Luís Fernando da Silva
Support Opportunities: Regular Research Grants