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New insight into the concept of carbonization degree in synthesis of carbon dots to achieve facile smartphone based sensing platform
, Article Scientific Reports ; Volume 7, Issue 1 , 2017 ; 20452322 (ISSN) ; Ehtesabi, H ; Rahmandoust, M ; Ahadian, M. M ; Hallaji, Z ; Eskandari, F ; Jokar, E ; Sharif University of Technology
Abstract
Direct pyrolysis of citric acid (CA) has been proved to be a facile bottom-up technique for making pristine carbon dots (CD) with homogenous size distribution. However, limited reports are available on systematic optimization of carbonization degree. In this investigation, pyrolysis temperatures between 160 °C and 220 °C were studied, based on CA thermal decomposition path, using various heating durations. The effect of the formation of more carbonized carbon particles (MCCPs), as the major byproduct of this method, on photoluminescence properties of CDs was also considered. The NaOH amount that neutralizes the solution and the effect of dilution on the emission intensity, were introduced as...