量子尺寸氧化锌颗粒的表面光电压谱研究

氧化锌是极少数几个可以实现量子尺寸效应的氧化物半导体材料1 ] .传统上 ,这种材料广泛用于陶瓷、压电传感器、催化剂以及发光器件等领域 .随着量子尺寸氧化锌颗粒制备工艺日臻成熟 ,这类材料的应用进一步拓展到光电转换 2 ] 、光催化3] 以及化学传感器 4] 领域 .而在这些领域中的应用都与颗粒的表面性质密切相关 .本工作中制备了两种不同粒径的氧化锌纳米微粒 ,利用表面光电压谱以及电场诱导表面光电压谱对颗粒的表面性质进行了研究 ,并对颗粒的表面态进行了具体指认 .1　实验部分氧化锌纳米微粒参照文献 5 ,6 ]方法制备 .将 5 .49g…

Studies of Surface Photovoltage Spectroscopy on Quantum-Sized ZnO Nanoparticles

In the present work, we prepared two kinds of quantum sized ZnO particles whose size were 3 nm(P1) and 5 nm(P2), respectively, and studied their surface properties with surface photovoltage spectroscopy(SPS) and electric field induced surface photovoltage spectroscopy(EFISPS). The photovoltaic response of the two samples showed opposite dependence on external electric field. And when electric field was applied, the thresholds of photovoltaic response of the two samples were all red shifted. The results showed that the surface properties of P1 were different from those of P2, because of their different preparation process. We assigned that basic zinc acetate structure exist on the surface of P1 sample. While for P2 sample prepared by aging P1, that kind of surface structure disappeared, but the particles might be doped with lithium ions in the aging process.