无机材料学报 ›› 2018, Vol. 33 ›› Issue (10): 1083-1088.DOI: 10.15541/jim20180065

所属专题: 二维材料

• 研究论文 • 上一篇    下一篇

垂直排列ReS2(1-x)Se2x合金纳米片的控制合成及带隙调控

敖伟栋1,2, 刘妍2, 马青山2, 刘欢1, 周斌2, 郑霄家2, 于东麒1, 张文华2   

  1. 1.辽宁师范大学 物理与电子技术学院, 大连 116029;
    2.中国工程物理研究院 化工材料研究所 四川省新材料研究中心, 成都 610200
  • 收稿日期:2018-01-31 修回日期:2018-03-23 出版日期:2018-10-20 网络出版日期:2018-09-25
  • 作者简介:敖伟栋(1990-), 男, 硕士研究生. E-mail: 865592273@qq.com
  • 基金资助:
    四川省重点研究开发项目(2017GZ0052);博士后创新人才支持计划(BX201700214)

Controllable Synthesis of Vertically Aligned ReS2(1-x)Se2x Nanosheets with Tunable Chemical Compositions and Bandgaps

AO Wei-Dong1,2, LIU Yan2, MA Qing-Shan2, LIU Huan1, ZHOU Bin2, ZHENG Xiao-Jia2, YU Dong-Qi1, ZHANG Wen-Hua2   

  1. 1.School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China;
    2. Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics, Chengdu 610200, China
  • Received:2018-01-31 Revised:2018-03-23 Published:2018-10-20 Online:2018-09-25
  • About author:AO Wei-Dong. E-mail: 865592273@qq.com
  • Supported by:
    Key Research and Development Projects of Sichuan Province (2017GZ0052);National Postdoctoral Program for Innovative Talents (BX201700214)

摘要:

二维过渡金属硫属化合物具有优异的电学和光学特性, 形貌控制及带隙调控对于其在光电子学、光子学、纳米电子学领域中的应用至关重要。研究采用CVD技术在SiO2/Si衬底上生长了垂直排列ReS2纳米片材料, 硒化处理后得到ReS2(1-x)Se2x合金纳米片, 并研究了硒化温度(700、850 和 920℃)及硒化时间(0.5、1和1.5 h)对ReS2(1-x)Se2x合金纳米片形貌及组分的影响。XPS元素定量分析及紫外-可见-近红外吸收光谱研究表明ReS2(1-x)Se2x样品中Se含量可以在x=0(纯ReS2)到x=0.86之间调变, 相应材料的带隙可从1.55 eV (800 nm)调变到1.28 eV (969 nm)。SEM结果显示ReS2(1-x)Se2x纳米片的结构受到硒化温度和硒化时间的影响, 硒化温度升高和硒化时间延长会破坏纳米片的垂直结构。上述结果表明本研究成功合成了垂直排列ReS2(1-x)Se2x合金纳米片, 该材料在电化学催化、功能电子器件和光电子器件方面具有潜在应用价值。

 

关键词: ReS2(1-x)Se2x, ReS2, 硒化, 垂直排列, 带隙调控

Abstract:

2D transition metal dichalcogenides (TMDs) have been extensively studied in recent years because of their appealing electrical and optical properties. Both morphology control and bandgap modulation of TMD alloys are critical for their applications in optoelectronics, photonics and nanoelectronics. In this work, the synthesis of vertically aligned ReS2(1-x)Se2x alloy nanosheets with tunable compositions on SiO2/Si substrate was achieved via CVD technology. The resulting ReS2(1-x)Se2x nanosheets were obtained by selenizing the vertically aligned ReS2 nanosheets at various temperatures for different durations. The ReS2(1-x)Se2x samples were characterized by XRD, SEM, XPS, HRTEM, elemental mapping, Raman spectra, and UV-Vis-NIR absorption spectra. Experimental results showed that the Se contents in ReS2(1-x)Se2x nanosheets can be gradually tuned from x=0 (pure ReS2) to x=0.86, and the bandgaps of the products were correspondingly modulated from 1.55 eV (800 nm) to 1.28 eV (969 nm). Moreover, the temperature and duration of selenization have huge effect on the morphology of the resulting ReS2(1-x)Se2x alloyed nanosheets, as evidenced by SEM observation. The vertical ReS2(1-x)Se2x alloy nanosheets may have significant application potential, e. g. , in the electrochemical catalysis, functional electeonic and optoelectronic devices.

Key words: ReS2(1-x)Se2x, ReS2, selenizing, vertically aligned, bandgap modulation

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