Monday, 23 December 2019

Synthesis of Graphene Quantum Dots (GQDs) from Azadirachta Indica (Neem) Leaves

Synthesis of Graphene Quantum Dots (GQDs) from Azadirachta Indica (Neem) Leaves
  1. CHECK LIST
    Neem Leaves, Deionized Water, Beaek, Magnetic Stirrer with Temperature option, FIlter Paper
  2. STEP 1.
    Take fresh Neam leaves, wash properly and dry at 60-80°C for some time until all the water content in the leaves evaporates. Crush the dried Neam leaves to form the fine powder.
  3. STEP 2.
    Take Neam leaves fine powder, and Pyrolysis it at 1000°C for 5 hours under inert gas to from Black colored Carbon powder.
  4. STEP 3.
    Take Black colored Carbon powder in RB flask. Add Sulfuric Acid (H2SO4) and Nitric Acid (HNO3) in 3:1 ratio respectively, and setup reflux at 80°C for 5 hours.
  5. STEP 4.
    More water was added to dilute the synthesized GQDs. Brow colored solution containing GQDs was filtered out to separate out unreacted content.
  6. RESULTS
    Graphene Quantum Dots (GQDs) color would be Brown; Fluorescence of GQDs found to be Green color, when excited in UV radiations. UV-VIs spectroscopy absorbance peak would be obtained around 280nm; Raman spectroscopy D band and G band would be obtained at around 1300cm-1 and 1550cm-1 respectively.
  7. NOTE: All the experiments should be done under the guidance of lab Incharge; and proper lab safety instructions.