Physical mechanisms of contact-electrification induced photon emission spectroscopy from interfaces  

作　　者：Yang Nan Jiajia Shao Ding Li Xin Guo Morten Willatzen Zhong Lin Wang 

机构地区：[1]Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Sciences,Beijing 101400,China [2]School of Nanoscience and Technology,University of Chinese Academy of Sciences,Beijing 100049,China [3]Georgia Institute of Technology,Atlanta,GA 30332,USA

出　　处：《Nano Research》2023年第9期11545-11555,共11页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62001031,52192610,51702018,and 51432005);the Youth Innovation Promotion Association,CAS,the Fundamental Research Funds for the Central Universities(No.E0E48957);the National Key R&D Program from Minister of Science and Technology(No.2016YFA0202704).

摘　　要：Photon emission during contact electrification(CE)has recently been observed,which is called as CE-induced interface photon emission spectroscopy(CEIIPES).Physical mechanisms of CEIIPES are essential for interpreting the structure and electronic interactions of a contacted interface.Using the methods of density functional theory(DFT)and time-dependent DFT(TDDFT),it is confirmed theoretically that the spectrum of emitted photons is contributed from electron transfer and transition during CE.Specifically,the excited electrons from higher energy state in one material may transfer to a lower energy state of another material followed by a transition;and/or some unstable excited electrons at a higher energy level of one material may transit to a lower energy state of itself,both of which result in CEIIPES.Furthermore,the CE-induced interface absorption spectrum(CEIIAS)has been demonstrated,due to the intermolecular electron transfer excitation.

关 键 词：SPECTROSCOPY contact electrification(CE) time-dependent density functional theory(TDDFT) CE-induced interface photon emission spectroscopy(CEIIPES) CE-induced interface absorption spectrum(CEIIAS) polymers 

分 类 号：O57[理学—粒子物理与原子核物理]