Influence of (PEO)128-(PPO)54-(PEO)128 triblock copolymer on ZnO morphological control and its optical properties
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ZnO nanoparticles were synthesized in the presence of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) ((PEO)128-(PPO)54-(PEO)128) triblock copolymer, through a precipitation and sol-gel method using Zn(CH3COO)2.2H2O as the zinc source with NaOH or Na2CO3 as a precipitating agent, respectively. The change of particle shape was dependent on the use of NaOH or Na2CO3. The crystallite size diminished when the concentration of (PEO)128-(PPO)54-(PEO)128 was increased. The energy gap varied in the range of 3.216-3.225 eV and 3.202-3.222 eV when NaOH and Na2CO3 were used, respectively. The dependence of the energy gap on the defect concentration and strain was explained.
Abstract
ZnO nanoparticles were synthesized in the presence of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) ((PEO)128-(PPO)54-(PEO)128) triblock copolymer, through a precipitation and sol-gel method using Zn(CH3COO)2.2H2O as the zinc source with NaOH or Na2CO3 as a precipitating agent, respectively. The change of particle shape was dependent on the use of NaOH or Na2CO3. The crystallite size diminished when the concentration of (PEO)128-(PPO)54-(PEO)128 was increased. The energy gap varied in the range of 3.216-3.225 eV and 3.202-3.222 eV when NaOH and Na2CO3 were used, respectively. The dependence of the energy gap on the defect concentration and strain was explained.
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