铁酸锌纳米晶体的制备及表面光伏特性研究  

Study on preparation and structural characteristics of ZnFe_2O_4 nanocrystalline

作　　者：曹锋[1] 李新勇[1] 曲振平[1] 金虹[1] 全燮[1] 陈国华[2] 

机构地区：[1]大连理工大学环境与生命学院工业生态与环境工程教育部重点实验室,辽宁大连116023 [2]香港科技大学化工系

出　　处：《功能材料》2007年第1期29-31,35,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(29977003)

摘　　要：采用偶合的共沉淀法和水热法相结合的方法,制备出ZnFe2O4纳米晶体,并利用DRS、XRD、FT-IR、TEM等技术对其结构和谱学特性进行了研究,并在其基础上利用表面光电压谱(SPS)深入探讨了所制样品的表面光伏特性,研究表明样品具有较窄的禁带宽度,晶型为正尖晶石型结构,大小均匀(7nm),无团聚,表面光伏特性研究显示ZnFe2O4纳米晶体具有明显的表面和量子限域效应,有一定的捕获电子能力,在外加电场下光伏响应变化明显,在正电场下有一个最佳响应值,而当负电场达到一定值时,外电场的光伏响应将占据主导地位。In this paper, zinc ferrite nanocrystallines are prepared by the coincided coprecipitation and the hydro- thermal method. XRD,DRS,FT-IR and TEM techniques have been used to characterize the structural and spectral features of the obtained samples, whereas surface photovoltage characteristics of the nanocrystallines are deeply investigated by the surface photovoltage spectroscopy （SPS）. The results show that the ZnFe2O4 nanocrystallines with spinel structure have a narrower energy-gap, and the particles are uniform with narrow size distribution. The SPS results indicate that the ZnFe2O4 nanocrystallines show obvious surface and quantum confined effect with a certain capability for capturing the electron, and the external electric field is proven to have a strong effect on the photovoltaic response while applying the external positive electric field. It is found that when a negative electric field reached a certain value, the external electric field of photovoltaic response will prevail.

关 键 词：铁酸锌 纳米晶体 表面光电压谱 光伏特性 

分 类 号：O649[理学—物理化学] O657.39[理学—化学]