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From

Biosynthesis of Zn5(CO3)2(OH)6 from Arachis Hypogaea Shell (Peanut Shell) and Its Conversion to ZnO Nanoparticles

M.T. Dieng, B.D. Ngom, P.D. Tall, M. Maaza

American Journal of Nanomaterials. 2019, 7(1), 1-9 doi:10.12691/ajn-7-1-1
  • Figure 1. XRD patterns curves of ZnO nanopowders (a) Sample P1: not annealed and (b) Sample P2: Annealed at 500 oC for 3h in air (c) Sample P3: Annealed at 500°C for 4h in air
  • Figure 2. SEM images of ZnO nanopowders; Sample P2: annealed at 500°C for 3h with various magnifications: (a) showing formation of nanodiscs (b) Polished surface with hexagonal nanochip shape (c) Policrystallization during growth (d) ZnO growth mode (e) and Sample P#: ZnO nanoparticles obtained after annealing at 500 oC for 4h in air
  • Figure 3. (a) Raman spectrum of Sample P1: non-annealing ZnO nanopowders (b) Raman spectrum of Sample P2: ZnO nanoparticles at 500°C for 3h in air (c) Sample P3: ZnO nanoparticles obtained after annealing at 500°C for 4h in air
  • Figure 4. FTIR of ZnO nanopowders (a) Sample P1: not annealed and (b) Sample P2: Annealed at 500°C for 3h in air, (c) Sample P3: ZnO nanoparticles obtained after annealing at 500°C for 4h in air
  • Figure 5. TG-DTG and DTA curves of ZnO nanopowders (a) Sample P1: not annealed and (b) Sample P2: Annealed at 500°C for 3h