Role of surface trapping state in the charge exchange characteristics of CdSe nanorod

The charge exchange (CE) characteristics of CdSe nanorod would be manipulated by the TBP and Li+. We employ electrochemical impedance spectroscopy (EIS) and cyclic voltammogram (CV) to scan the CE mechanism of CdSe nanorod. The EIS data shows that TBP would restrict the CE process and the Li+ would show the opposite role. The CV data confirms that the restriction behavior of CE affected by TBP is originated from the filling surface trapping state. Meanwhile, the facilitation of CE process manipulated by Li+ is coming from the creation of new trapping state and the deepening of trapping state. In comparison with TBP, Li+ would exhibit much extensive function in affecting the trapping state. Finally, the results help people to further understand the characteristics of trapping state in the charge property of nanocrystals.