Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 113: Nanostructured Surfaces and Thin Films III: Dots, Particles, Clusters (joint session O/CPP)
CPP 113.8: Talk
Friday, March 20, 2020, 12:15–12:30, WIL B321
Cu2+ Detection by Carbon Quantum Dots Derived from Water Hyacinth (Eichhornia crassipes) — •Eduardo Magdaluyo Jr1, Gerald Mari Quiachon2, and Persia Ada de Yro2 — 1Department of Mining, Metallurgical and Materials Engineering, University of the Philippines, 1101 Diliman, Quezon City, Philippines — 2Materials Science Division, Industrial Technology Development Institute, Department of Science and Technology, Bicutan, Taguig, Metro Manila, Philippines
Preparation of carbon quantum dots (CQDs) was derived from water hyacinth (Eichhornia crassipes) leaves as a carbon source using facile approach of hydrothermal treatment in acidic medium. The as-synthesized CQDs exhibited coagulation in aqueous solution and a strong blue fluorescence under UV light at 365 nm. Infrared spectra analysis confirmed the presence of functional groups such as hydroxyl (OH), carboxyl (COO) and carbonyl (CO) on the surface of the CQDs. The functional groups were analyzed using zeta potential and was found to induce surface charges which allow the attraction of copper ions and bind with the CQDs. These surface charges were utilized in the application of the CQDs as a biosensor for the detection of Cu2+ ions based on ion-induced fluorescence quenching of CQDs. The photoluminescence spectra confirmed this process and it was found to have excellent affinity toward Cu2+ as the PL of CQD with copper solution was quenched relative to pure CQD solution. The highest quantum yield of the CQD sample being measured against deionized water was found to be at 6.48.