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Structural and electronic properties of single-walled carbon nanotubes adsorbed with 1-pyrenebutanoic acid,succinimidyl ester

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science china Chemistry 2008年第12期51卷 1203-1210页

作者： fan wenjie & zhang ruiqin centre of super-diamond and advanced films (COSDAF) and department of physics and materials science, city university of hong kong, hong kong sar, china centre of super-diamond and advanced films (COSDAF) and department of physics and materials science City University of Hong Kong Hong Kong SAR China

The adsorption of a 1-pyrenebutanoic acid, succinimidyl ester (PSE) interacting with metallic armchair (n, n) carbon nanotubes (CNTs) (n= 3-13) was investigated by using a density-functional tight-binding method with an empirical van der Waals force correction. In this study of large systems involving weak interactions, our calculations showed that the pyrene ring of PSE could be spontaneously absorbed onto the CNTs surface through π-π stacking at the physisorption distances. Increasing of the CNTs diameter leads to a higher adsorption energy. After adsorption of PSE on its sidewall, the geometric and electronic structures of CNTs are basically undamaged. CNTs contribute to the main peak of the electron excitation procedure in the UV/vis spectrum, with a slight red shift after adsorption of PSE.

关键词： SWNTs PSE π-π stacking density-functional tight-binding method

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Vapor phase epitaxy of PbS single-crystal films on water-soluble substrates and application to photodetectors

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Nano Research 2022年第6期15卷 5402-5409页

作者： Yifan Wang Jing Xia Xuanze Li fan Ru Xue Chen Ze Hua Ruiwen Shao Xuecong Wang Wenjun zhang Chun-Sing Lee Xiangmin Meng Key Laboratory of Photochemical Conversion and Optoelectronic materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China centre of Material science and Optoelectronic Engineering University of Chinese Academy of SciencesBeijing 10049China Engineering Research Center for Semiconductor Integrated Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Analysis&Testing Center Beijing Institute of TechnologyBeijing 102488China Beijing advanced Innovation Center for Intelligent Robots and Systems and Institute of Convergence in Medicine and Engineering Beijing Institute of TechnologyBeijing 100081China Center of super-diamond and advanced films(COSADF)and department of materials science and Engineering City University of Hong KongHong KongChina Center of super-diamond and advanced films(COSDAF)and department of Chemistry City University of Hong KongHong KongChina

Lead sulfide(PbS),a typical functional semiconductor material,has attracted serious attention due to its great potential in optoelectronics ***,controllable growth of PbS single-crystal film still remains a great ***,we report heteroepitaxial growth of large-scale highly crystalline PbS films on alkali salt(NaCl and KCl)substrates via chemical vapor deposition(CVD).Structural characterizations demonstrate that the as-grown PbS films exhibit an atomically sharp interface with the underlying *** epitaxial relationships between the epilayers and substrates were determined to be PbS(100)//NaCl(100)or KCl(100),PbS[010]//NaCl[010]or KCl[010].Owing to the high solubility of alkali salt,the epitaxial PbS films can be rapidly released from the underlying substrates and transferred to other substrates of interest while maintaining good integrity and crystallinity,the process of which is particularly attractive in the fields of electronics and ***,photodetectors based on the transferred PbS films were fabricated,exhibiting a high photoresponsivity of 7.5 A/W,a detectivity of 1.44×10^(12)Jones,and a rapid response time of approximately 0.25 *** work sheds light on the batch production,green transfer,and optoelectronic application of PbS films.

关键词： heteroepitaxial growth lead sulfide(PbS) single-crystal film photodetector transferable

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