Facile one-pot synthesis of 3D graphite-SiO2 composite foam for negative resistance devices

作者：Wu, Ye; Fu, Hao; Roy, Amitava; Song, Pengfei; Lin, Yingcheng^*; Kizilkaya, Orhan^*; Xu, Jian^*

来源：RSC Advances, 2017, 7(66): 41812-41818.

DOI：10.1039/c7ra07465d

• X-RAY-ABSORPTION
• ELECTRICAL-CONDUCTIVITY
• CARBON NANOTUBES
• GRAPHENE
• SUPERCAPACITOR
• TEMPERATURE
• SPECTROSCOPY
• ELECTRODE
• FILMS
• SIO2

In this study, we successfully prepare a porous graphite-SiO2 composite foam via a facile glucose-foamingbased method. The foam was characterized by XRD, XPS, SEM, Raman, and soft X-ray absorption spectroscopy of the carbon and oxygen K-edges and by silicon K-edge X-ray absorption near edge structure (XANES) spectroscopy. The electrical properties of the sample were evaluated using current-voltage measurements. The synthesized graphite-SiO2 composite foam showed negative resistance effect, i.e. an increase in the applied voltage led to a decrease in current. This negative resistance effect can be explained by two possible mechanisms: (1) the existence of defect states and (2) a change in the charge shifting amount.

• 出版日期2017
• 单位重庆大学