Growth and characterization of micro and nanostructures of lead telluride (PbTe) by thermal evaporationmethod
Growth and characterization of micro and nanostructures of lead telluride (PbTe) by thermal evaporationmethod
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DOI：
10.1016/j.matlet.2013.01.053
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发表时间：
2013-04
影响因子：
3
通讯作者：
V. Tamilselvan;R. R. Kumar-R.;K. N. Rao
中科院分区：
文献类型：
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作者：
V. Tamilselvan;R. R. Kumar-R.;K. N. Rao
在3×10− 5 mbar的高真空中，通过简单的热蒸发PbTe，在硅和玻璃衬底上生长了碲化铅的微米和纳米结构。在蒸发源和衬底之间的两个不同距离下进行生长。合成的产物由纳米棒和微塔组成，蒸发源与衬底之间的距离分别为2.4cm和3.4cm。X射线衍射和透射电子显微镜研究证实了纳米棒和微塔的结晶性质。纳米棒的生长采用气固相反应机理。每个微塔由纳米片晶组成，并在其末端覆盖有球形催化剂颗粒，表明生长通过气-液-固（VLS）机制进行。在微塔的尖端上记录的EDS光谱显示了Pb和Te的存在，证实了微塔的自催化VLS生长。这些结果为PbTe纳米和微米结构的各种应用开辟了新的合成方法。
Lead telluride micro and nanostructures have been grown on silicon and glass substrates by a simple thermal evaporation of PbTe in high vacuum of 3×10−5mbar. Growth was carried out for two different distances between the evaporation source and the substrates. Synthesized products consist of nanorods and micro towers for 2.4cm and 3.4cm of distance between the evaporation source and the substrates respectively. X-ray diffraction and transmission electron microscopy studies confirmed crystalline nature of the nanorods and micro towers. Nanorods were grown by vapor solid mechanism. Each micro tower consists of nano platelets and is capped with spherical catalyst particle at their end, suggesting that the growth proceeds via vapor–liquid–solid (VLS) mechanism. EDS spectrum recorded on the tip of the micro tower has shown the presence of Pb and Te confirming the self catalytic VLS growth of the micro towers. These results open up novel synthesis methods for PbTe nano and microstructures for various applications.