SYNTHESIS AND FUNCTIONALIZATION OF CARBON-BASED NANOMATERIALS TOWARD TUNABLE OPTICAL PROPERTIES

• Main Author: Aulia Permatasari, Fitri
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68936
• Institution: Institut Teknologi Bandung

Carbon-based nanomaterials, emerging materials, exhibit versatile flexibility in their superior properties, such as their optical and electrical properties. Thus, the carbon-based nanomaterials are widely utilized in diverse applications including, optoelectronics, sensors, and catalysts. Rational design through a controllable synthesis and functionalization was considered the most effective way to tailor their superior properties, especially optical properties that included photoluminescence and absorption. However, the complexity of the synthesis and functionalization process, also the as-synthesized Carbon-based nanomaterials’ structure become a bottleneck issue for further development. Herein, a rational design of Carbon-based nanomaterials through a facile synthesis method and insitu functionalization successfully tailored the photoluminescence and absorption properties of Carbon-based nanomaterials. Also, the experimental and computational studies were integrated to elucidate the underlying role of nitrogen functionalization in the properties of Carbon-based nanomaterials. The results show that the emission of as-synthesized Carbon Nanoparticles (CNPs) was successfully tunning from 490-530 nm, exhibiting blue-yellow emission with maximum Fluorescence Quantum Yield of 14,5%. This tunable emission could be achieved by controlling their nitrogen concentration, that strongly depend on their final temperature during microwave irradiation. In addition, the absorption spectra of Carbon Dots (CDs) were also successfully tunning from UV to first NIR window region by controlling the C-N configuration type, concentration, and position of their nitrogen functionalization. The as-prepared CDs exhibit an additional absorption peak centered at 650 nm, that in the first NIR window region, a preferable region for biomedical application. Furthermore, a deep understanding of the nitrogen functionalization, i.e., pyrrolic-N, pyridinic-N, and Graphitic-N to the optical, electronic, and morphological of CDs were proposed systematically and comprehensively. This study facilitates the preparation strategy availability and a deep understanding of the nitrogen functionalization role in the entanglement of the optical, electronic, and morphological Carbon-based nanomaterials.