investigation of hydrothermal process time on the size of carbon micro- and nano-spheres

In this study, carbon nano-micro spheres with tightly controllable size, regular and perfect shape, high yields and narrow size distribution were prepared simply from glucose and di water as precursors using a hydrothermal method. by setting the initial concentration of glucose solution and changing the hydrothermal process time at a constant temperature of 160 °c, carbon spheres with various sizes were synthesized in a sealed autoclave. the relationship between the average carbon sphere size and hydrothermal process time has been discussed. by increasing the hydrothermal process time at a constant temperature (160 ° c) and a constant concentration of glucose solution (0.75 molar), carbon nano-micro spheres were obtained. the diameters of carbon nano-micro spheres synthesized in this study ranged from 90 nm to 4.5 μm. the obtained carbon nano-micro spheres were analyzed by different techniques including scanning electron microscopy (sem), x-ray diffraction patterns (xrd), energy dispersive spectrometry (eds) and raman analysis. in addition, the existence of surface functional groups on carbon nano/micro spheres was characterized by fourier transform infrared (ftir) measurements.