Layered alpha-MoO3 nanoplates for gas sensing applications

Autor(es)

Felix, A. A. ^[1] ; Silva, R. A. ^[1] ; Orlandi, M. O. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Dept Engn Phys & Math, Chem Inst, Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CrystEngComm; v. 22, n. 27, p. 4640-4649, JUL 21 2020.
• Citações Web of Science: 0

Resumo

The synthesis of alpha-MoO(3)nanoplates with a unique well-faceted rectangular morphology produced by a polymeric solution route is presented. This versatile chemical route allowed the growth of layered nanoplates on different crystalline substrates to manufacture electronic/optoelectronic nanodevices. The alpha-MoO3 crystalline phase was identified by both X-ray diffraction (XRD) and Raman spectroscopy. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) showed that the well-faceted rectangular layered nanoplates can be obtained depending on the fine control of the synthesis parameters due to the MoO3 sublimation. Gas sensing measurements revealed that the alpha-MoO3 nanoplates exhibit an enhanced response to NO2, with sensor signals up to 50, combined with a low optimum operating temperature. In addition, the devices exhibited the highest selectivity to NO2 relative to H-2, CO, and CH4, which can be a consequence of the specific exposed surface plane. These results reveal that layered alpha-MoO3 nanoplates are promising for use in the manufacturing of high-performance NO2 gas sensor nanodevices. (AU)

• Processo FAPESP: 17/26219-0 - Estudo de Sensores Químicos de Elemento Único a base de semicondutores de óxidos metálicos
• Beneficiário: Marcelo Ornaghi Orlandi
• Modalidade de apoio: Auxílio à Pesquisa - Regular