Structural, Optical and Electrical Properties of rGO@SnO2 Nanopowder Obtained via Chemical Co-precipitation Method

Authors Jagat Pal Singh1, G.C. Joshi2

1Department of Physics, G.B Pant University of Agri. & Tech., Pantnagar-263145, India

2RITL, G.B Pant University of Agri. & Tech., Pantnagar-263145, India

Issue Volume 14, Year 2022, Number 1
Dates Received 04 February 2022; revised manuscript received 21 February 2022; published online 28 February 2022
Citation Jagat Pal Singh, G.C. Joshi, J. Nano- Electron. Phys. 14 No 1, 01028 (2022)
PACS Number(s) 81.07.Wx
Keywords Metal oxide (4) , rGO (2) , FESEM (5) , XRD (76) , Tin oxide (8) , Band gap (29) .

The chemical co-precipitation technique is used to synthesize rGO@SnO2 nanopowder. Among a variety of metal oxides, SnO2 is an n-type semiconductor with a broad band gap of 3.64 eV at room temperature, which is widely used in different applications such as sensors, transparent conducting electrodes, optoelectronic devices, photocatalysts, lithium-ion batteries, and solar cells. When analyzing the X-ray diffraction (XRD) spectra, the crystallite size of nanoparticles is 2.15 nm. Fourier transform infrared spectroscopy (FTIR) shows the stretching and vibrational modes of the metal-oxygen bond at 662 cm – 1, confirms the presence of antisymmetric O–Sn–O bridge and the appearance of peaks at 1387 cm – 1 and 1635 cm – 1 due to C–H and CC bonds, respectively. Field emission scanning electron microscopy (FESEM) image shows that the size of nanocrystallites is less than 10 nm. The optical band gap (OBG) of rGO@SnO2 nanopowder is calculated using Tauc plot analysis and is 3.53 eV, which is less than OBG of pure SnO2. Conductivity and resistivity of rGO@SnO2 nanopowder are calculated from the I-V characteristics.

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