Citation: WU Jian, WANG Yu, HUANG Feng, YANG Yang, MENG Chang- ng. Thermal Diffusion Synthesis and Characterization of SnO2 Clusters within ZSM-5 Crystals[J]. Acta Physico-Chimica Sinica, 2010, 26(06): 1705-1710. doi: 10.3866/PKU.WHXB20100611
ZSM-5晶体内SnO2团簇的热扩散法合成及表征
以ZSM-5晶体作为主体材料, 采用热扩散方法于750和850 ℃在空气中分别制备了SnO2/ZSM-5主客体材料, 通过一系列方法考察了该材料的化学组成、晶体形貌、晶相、光致发光等物理化学性质. 采用基于密度泛函理论(DFT)的微孔吸附分析方法对该材料的孔结构进行详细研究, 推断了该材料中SnO2的分布方式. 结果表明: 二氧化锡团簇负载到了分子筛孔道中而非分布在晶体表面, 而且随着热扩散温度升高, 样品中SnO2的含量增多; 进入分子筛中的二氧化锡团簇主要分布在ZSM-5分子筛的微孔中; 负载后的分子筛晶体在热扩散温度为750 ℃时保持了较好的晶体形貌而且具有较好的可见光通透性和良好的荧光发光性能, 具有较大后续的器件化和功能化应用潜力.
English
Thermal Diffusion Synthesis and Characterization of SnO2 Clusters within ZSM-5 Crystals
We used thermal diffusion to load SnO2 into ZSM-5 crystals as it is regarded as a od host material for semiconductor guest encapsulation. The experiments were carried out at 750 and 850 ℃in air. A series of tests were conducted to investigate the basic physical chemistry properties such as chemical composition, crystal images, crystal phase and photoluminescence. An intense porosity analysis based on density functional theory was used to investigate the pore texture of the SnO2-loaded samples. We demonstrate that the SnO2 clusters are located within ZSM-5 instead of on the surface of the crystals. The SnO2 content increases as the thermal diffusion temperature rises. The SnO2 clusters are mainly distributed within the ZSM-5 channels. The sample with a low SnO2 content at 750 ℃ possesses od visible light transmittance and displays od photoluminescence behavior, which makes it a promising material for functionalization and for device-based applications.
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Key words:
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Pore size distribution
- / ZSM-5 crystal
- / Tin dioxide
- / N2 adsorption isotherm
- / Photoluminescence spectrum
- / DFT method
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