研究论文

硫化锌与硫化锌/氧化锌异质结纳米线的化学气相沉积法制备与表征

  • 谢云龙 ,
  • 钟国 ,
  • 杜高辉
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  • 浙江师范大学物理化学研究所 先进催化材料省部共建教育部重点实验室 金华 321004

收稿日期: 2012-03-17

  修回日期: 2012-05-01

  网络出版日期: 2012-05-07

基金资助

国家自然科学基金(No. 10904129)和教育部新世纪优秀人才支持计划(NCET-11-1081)资助项目.

Preparation and Characterization of ZnS and ZnS/ZnO Heterostructure Nanowire by Chemical Vapor Deposition

  • Xie Yunlong ,
  • Zhong Guo ,
  • Du Gaohui
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  • Key laboratory of the Ministry of Education for Advanced Catalysis Material, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004

Received date: 2012-03-17

  Revised date: 2012-05-01

  Online published: 2012-05-07

Supported by

This work was supported by the National Natural Science Foundation of China (No. 10904129) and the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-11-1081).

摘要

介绍一种利用石墨还原快速制备大量硫化锌纳米线的方法,并分别合成了超晶格型、双轴型、核/壳型的硫化锌/氧化锌异质结纳米线。所合成的硫化锌纳米线存在六方纤锌矿和立方闪锌矿两种晶型,纳米线长度达几十微米,直径在20-50 nm,直径均匀且产量很高。在具有双轴型的硫化锌/氧化锌异质结中,首次发现具有超结构特征的氧化锌。HRTEM分析表明,硫化锌/氧化锌超晶格异质结界面为ZB-ZnS(111)∥ZnO(0001),而核/壳型异质结界面为W-ZnS(0001)∥ZnO(0001),这三个晶面分别为各自晶体的极性面,即所合成的硫化锌/氧化锌异质结中极性面相互平行。对ZnS 和ZnS/ZnO 异质结的生长机制进行了探讨,并对硫化锌纳米线与硫化锌/氧化锌异质结的光学性质进行了分析。

本文引用格式

谢云龙 , 钟国 , 杜高辉 . 硫化锌与硫化锌/氧化锌异质结纳米线的化学气相沉积法制备与表征[J]. 化学学报, 2012 , 70(10) : 1221 -1226 . DOI: 10.6023/A12030013

Abstract

This paper presents a rapid preparation of large amounts of ZnS nanowires and ZnS/ZnO heterostructure nanowires by chemical vapor deposition based on graphite reduction. The mixtures of ZnS and graphite powder with weight ratio of 3:1 were placed in a quartz boat, and the quartz boat was positioned at the center of a quartz tube furnace. A Si substrate coated with gold nanoparticles was placed at 5 cm downstream of carrying gas flow from ZnS source. Under a constant nitrogen flow rate of 100 sccm, the furnace was elevated to 870-935 °C at a pressure of 15-20 Torr. After reaction for 5-30 min, the Si substrate was taken out of the furnace after it was cooled down to room temperature, and the ZnS nanowires were grown on the substrate. Moreover, the superlattice and biaxial ZnS/ZnO heterostructure nanowires can be produced using the mixtures of ZnS, ZnO, and graphite with weight ratio of 1.5:1.5:1 as raw materials with a reaction temperature of 935-970 °C. The cable-like ZnS/ZnO heterostructure nanowires can be obtained by annealing the obtained ZnS nanowires in nitrogen at 700 °C for 2 h. The as-grown products have been characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and photoluminescence. The as-grown ZnS nanowires contain Wurtzite and Zinc blende structures, and the nanowires are tens of micrometers in length and 20-50 nm in diameter with high yield. To the best of our knowledge, it is the first report concerning the ZnO superstructure found in the as-gown biaxial ZnS/ZnO heterostructures. The HRTEM analysis shows ZB-ZnS(111) // ZnO(0001) in the superlattice heterojunctions and W-ZnS(0001) // ZnO(0001) in the cable-like heterojunctions. The three crystal planes are all polar planes, and they are parallel to each other in the ZnS/ZnO heterojunctions. The growth mechanism of ZnS and ZnS/ZnO heterostructure nanowires has been discussed. Their photoluminescence properties have been analyzed, and they all show broad green emission band.

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