Autor(es)

Zito, C. A. ; Volanti, D. P. ; Kriven, WM ; Wang, J ; Zhou, Y ; Zhu, D ; Costa, G

• Tipo de documento: Artigo Científico
• Fonte: DEVELOPMENTS IN STRATEGIC CERAMIC MATERIALS II; v. N/A, p. 7-pg., 2017-01-01.

Resumo

Nanocomposites based on metal oxide semiconductors and reduced graphene oxide (RGO) have been proposed as gas sensors to respond at room temperature. In this work, we prepared SnO2-RGO nanocomposite by microwave-assisted hydrothermal (MAH) method in one-step. The combined characterization techniques including X-ray diffraction (XRD), Fourier-transform infrared (MIR) spectroscopy, field emission-scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM) confirm the formation of SnO2-RGO nanocomposite, and the distribution of SnO2 nanoparticles on RGO surface. The gas sensing performance of SnO2-RGO was evaluated by ethanol exposure at room temperature (21 degrees C). The results of gas sensing performance reveal that SnO2-RGO sensor has a great response to ethanol at room temperature, with a response time of about 100 seconds for the highest concentration of the gas (1,500 ppm). Moreover, it was found that the sensor has a higher selectivity for ethanol than for methanol. It is considered that RGO plays an important role in the gas sensing response. (AU)

• Processo FAPESP: 14/17343-0 - Efeito de metais catalisadores ou óxido de grafeno reduzido em óxidos metálicos semicondutores para detecção de compostos orgânicos voláteis
• Beneficiário: Diogo Paschoalini Volanti
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/05916-9 - Sinergia entre Pd-SnO2 ou óxido de grafeno reduzido-SnO2 para detecção de compostos orgânicos voláteis na presença de umidade
• Beneficiário: Cecilia de Almeida Zito
• Modalidade de apoio: Bolsas no Brasil - Mestrado