TEMPERATURE DEPENDENCE STUDY TO THE PHOTOLUMINESCENCE PROPERTIES OF CARBON NANODOTS BY MICROWAVE-ASSISTED ROUTE

• Main Author: NAKUL (NIM: 20214036), FITRIYANTI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22194
• Institution: Institut Teknologi Bandung

Carbon nanodots (CNDs) phosphors have a great potential due to their unique luminescence properties, low cytotoxicity, good biocompatible and easy to functionalized as optoelectronics device, sensor and bioimaging field. Here, we propose a fast and an energy efficiency synthesis process of CNDs by mixing urea and citric acid through a microwave-assisted reaction. The microwave’s apparatus was designed specifically thus allowing to monitor the sample’s temperature during radiation process. The emission wavelength of the CNDs sample varied depends on temperature of the samples. It was found that the optimum range of temperature (155-175oC) tended to increase luminescence intensity of CNDs samples. The changing of temperature is correlated to any formation of carbonyl and amide band structures as shown in FTIR spectra, which have an essential role in emitting single colour yellow light. Moreover, the presense of the red shift behaviour is found due to the electrons composition in the formed bonds. In addition, the required optimum reaction for provide the formation of highly fluorescent CNDs were also investigated by determined microwave’s duty cycle. Based on the results, it found that photoluminescence properties in CNDs structure depends on temperature and functional groups in the formed bonds during synthesis process by microwave radiation.