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学术报告:Fabrication and Applications of Mechanically-Exfoliated Single- and Few-Layer Transition-Metal Dichalcogenides Nanosheets

2015/09/18 | 【 【打印】【关闭】 | 访问次数:

报告题目:Fabrication and Applications of Mechanically-Exfoliated Single- and Few-Layer Transition-Metal Dichalcogenides Nanosheets

报 告 人:李海 教授 (南京工业大学先进材料研究院)

报告时间:2015年9月23日(周三)下午13:00

报告地点:嘉定园区学术活动中心307房间

报告简介:

Fabrication and Applications of Mechanically-Exfoliated Single- and Few-Layer Transition-Metal Dichalcogenides Nanosheets 
Hai Li

Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, P.R. China

Two-dimensional (2D) layered inorganic graphene analogues, such as transition-metal dichalcogenides (TMDs, e.g. MoS2, WS2, ZrS2, MoSe2, NbSe2, TiS2, TaS2, and WSe2) [1-7], have been extensively exploited in the fields of lubrication, catalysis, energy storage, electronics and sensors. It is well known that the physical and electronic properties of 2D layered nanomaterials are highly related to their thickness. Herein, single- and few-layer transition-metal dichalcogenides nanosheets, such as MoS2, WSe2, TaS2 and TaSe2, are prepared by the mechanical exfoliation method. By analysis of the optical contrast differences between the substrates and nanosheets, we developed a simple optical identification method to distinguish single- and multi-layer TMD nanosheets on Si substrate coated with 90 and 300 nm SiO2. Raman microscope is employed to characterize the single- to multi-layer MoS2 and WSe2 nanosheets. The Raman characterization of shear and breathing modes of single- and multi-layer MoS2 and WSe2 nanosheets in the low frequency range (< 50 cm-1) can be used to accurately identify the layer number of nanosheets. In the last part, I will briefly introduce the applications of single- and multi-layer MoS2 nanosheets in the fields of gas sensor and phototransistor.

Reference:

[1] Li, H.; Yin, Z. Y.; He, Q. Y.; Li, H.; Huang, X.; Lu, G.; Fam, D. W. H.; Tok, A. I. Y.; Zhang, Q.; Zhang, H. Small 2012, 8, 63-67.
[2] Yin, Z. Y.; Li, H.; Li, H.; Jiang, L.; Shi, Y. M.; Sun, Y. H.; Lu, G.; Zhang, Q.; Chen, X. D.; Zhang, H. ACS Nano 2012, 6, 74-80.
[3] Li, H.; Lu, G.; Yin, Z. Y.; He, Q. Y.; Li, H.; Zhang, Q.; Zhang, H. Small 2012, 8, 682-686.
[4] Zeng, Z. Y.; Yin, Z. Y.; Huang, X.; Li, H.; He, Q. Y.; Lu, G.; Boey, F.; Zhang, H. Angew. Chem. Int. Ed. 2011, 50, 11093-11097.
[5] Li, H.; Lu, G.; Wang, Y.; Yin, Z.; Cong, C.; He, Q.; Wang, L.; Ding, F.; Yu, T.; Zhang, H. Small 2013, 9, 1974-1981.
[6] Li, H.; Qi X. Y.; Wu J.; Zeng Z. Y.; Wei J.; Zhang H. ACS Nano 2013, 7, 2842-2849.
[7] Li, H.; Wu J.; Huang, X.; Lu, G.; Yang J.; Lu X.; Xiong Q. H.; Zhang H. ACS Nano 2013, 7, 10344–10353
[8] Wu J.; Li, H.; Yin, Z.; Li, H.; Liu J.; Cao X.; Zhang, Q.; Zhang, H. Small 2013, 9, 3314-3319.

报告人简介:

李 海

理学博士,教授

南京工业大学先进材料研究院

2001 年毕业于郑州大学化学系化学专业,获得学士学位。2007年7月于中国科学院上海应用物理研究所获得博士学位,随后留所从事博士后研究工作。2009年2 月至2014年7月在新加坡南洋理工大学材料科学与工程学院张华教授课题组继续从事博士后研究。2014年8月加入南京工业大学先进材料研究院。2015 年9月被遴选为第六批江苏省特聘教授,并获得重点资助。
研究方向
1、二维层状纳米材料的制备、表征及其应用。
2、无机、聚合物材料表面化学修饰及其应用。
3、微纳米图案的制备及其在生物分子固定和无机纳米材料生长方面的应用。
学术成绩
主要专注于功能纳米材料的研究,发表SCI 论文75篇。其中以第一作者身份在Accounts of Chemical Research、ACS Nano、Small、Chemical Communications、Langmuir、Journal of Physical Chemistry B等期刊发表19篇,单篇最高引用291次,总被引用次数超过4000次,h-index为28。
目前主持国家自然科学基金面上项目、教育部归国留学人员科研启动基金和江苏省高校自然科学基金面上项目各一项。