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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.)

The Role of Hierarchical Morphologies in the Superior Gas Sensing Performance of CuO-Based Chemiresistors

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Author(s):
Volanti, Diogo P. [1] ; Felix, Anderson A. [2, 1] ; Orlandi, Marcelo O. [1] ; Whitfield, George [2] ; Yang, Dae-Jin [2] ; Longo, Elson [1] ; Tuller, Harry L. [2] ; Varela, Jose A. [1]
Total Authors: 8
Affiliation:
[1] Univ Estadual Paulista UNESP, Inst Quim, Dept Quim Fis, BR-14800900 Araraquara, SP - Brazil
[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 - USA
Total Affiliations: 2
Document type: Journal article
Source: ADVANCED FUNCTIONAL MATERIALS; v. 23, n. 14, p. 1759-1766, APR 12 2013.
Web of Science Citations: 145
Abstract

The development of gas sensors with innovative designs and advanced functional materials has attracted considerable scientific interest given their potential for addressing important technological challenges. This work presents new insight towards the development of high-performance p-type semiconductor gas sensors. Gas sensor test devices, based on copper (II) oxide (CuO) with innovative and unique designs (urchin-like, fiber-like, and nanorods), are prepared by a microwave-assisted synthesis method. The crystalline composition, surface area, porosity, and morphological characteristics are studied by X-ray powder diffraction, nitrogen adsorption isotherms, field-emission scanning electron microscopy and high-resolution transmission electron microscopy. Gas sensor measurements, performed simultaneously on multiple samples, show that morphology can have a substantial influence on gas sensor performance. An assembly of urchin-like structures is found to be most effective for hydrogen detection in the range of parts-per-million at 200 degrees C with 300-fold larger response than the previously best reported values for semiconducting CuO hydrogen gas sensors. These results show that morphology plays an important role in the gas sensing performance of CuO and can be effectively applied in the further development of gas sensors based on p-type semiconductors. (AU)

FAPESP's process: 11/02408-1 - Morphological Control of Nanostructured Copper (II) Oxide and Zinc Oxide Applied in Gas Sensors
Grantee:Diogo Paschoalini Volanti
Support Opportunities: Scholarships in Brazil - Post-Doctoral