Studying the structural and optical properties of carbon quantum dots prepared by electro-chemical method

There are many different applications for carbon quantum dots (CQDs), including environmental sensitizers. In this paper, carbon quantum dots prepared by electro-chemical method. X-ray diffraction was used to evaluate the nature and size of matter. The X-ray spectrum showed a distinct peak at 2θ = 31.8° with two other small peaks at 48° and 70°. Also, the FTIR transmittance spectrum was examined to find out the bonds formed for the carbon nanostructures. The primary peaks are the O–H stretching vibration band at 3390 cm−1 and 2924 cm−1, C–H at 2850 cm−1, C=C at 1570 cm−1, C–O–H at 1438 cm−1and 1373 cm−1, C=O at 1111 cm−1, and C–O at 1006 cm−1. In addition, optical properties of the UV–VIS absorption spectrum were investigated, where it has an absorption spectrum peak at 220 nm. The transmission electron microscopy technique results showed that the CQDs are almost spherical and have a limited size distribution of approximately 10 nm on average.