纳米SnO2和分子筛封装纳米SnO2簇的制备

采用改良的液相法制备出纳米ＳｎＯ２超微粒，以及在分子筛的笼穴之中合成出纳米ＳｎＯ２簇．利用ＸＲＤ，ＴＥＭ和Ｍｏｓｓｂａｕｅｒ谱（穆谱）对２种纳米粒子的微观结构状态进行了表征．ＸＲＤ和ＴＥＭ测得液相法制备的ＳｎＯ２超微粒晶粒度为１０ｎｍ左右．穆谱研究表明２种纳米ＳｎＯ２微晶的穆谱均由体相原子和界面相原子２套子谱所组成．穆谱研究还证实了分子筛封装纳米ＳｎＯ２簇微粒的分布均匀程度明显高于液相法制得的纳米ＳｎＯ２．

Prepration and Characterization of nm SnO 2 Ultrafines and Zeolite Entrapped nm SnO 2 Clusters

The nm SnO 2 ultrafines are prepared by improved liquid phase method and the nm SnO 2 clusters are systhesised in the cage of zeolite.The structure of nm SnO 2 ultrafines and nm SnO 2 clusters is characterized by XRD,TEM and Mssbauer spectroscopy.It's found that the crystal size of the nm SnO 2 ultrafines is about 10 nm.The Mssbauer spectroscopy show that nm SnO 2 ultrafines and nm SnO 2 clusters both consist of two doublets:one doublet corresponds to bulk atoms and another is suggested to originate from the atoms in the grain boundaries.Moreover,Mssbauer spectroscopy also show that the grain distribution of nm SnO 2 cluster is more homogenous than that of nm SnO 2 untrafines.