In-Situ Sensor Response of Copper Oxide Urchin-like Structures

• Autor(a) principal: Orlandi, M. O. [UNESP]
• Data de Publicação: 2016
• Outros Autores: Felix, A. A. [UNESP], Suman, P. H. [UNESP], Varela, J. A. [UNESP], Volanti, D. P. [UNESP], IEEE
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/162710
• topic: Sensors; copper oxide; nanomaterials

In this work we report an advanced study of gas sensor performance of copper oxide (CuO) urchin-like structures synthesized by microwave assisted hydrothermal method. Copper oxide in an interesting p-type semiconductor in order to study the mechanisms related to the sensor response of CuO structures, we developed a special sample holder which enables the simultaneous characterization of materials by X-ray absorption near edge structure (XANES) and electrical measurements. Quantitative XANES analyses showed that the CuO material can have its surface completely reduced when exposed to H-2 in N-2 baseline and electrical measurements confirm the abrupt decrease in the material resistance. This superficial reduction is reversible after exposition of sample to a synthetic air atmosphere. Sensor response models for CuO material based on these findings were proposed.