Plasmon-induced ultrafast charge transfer in single-particulate Cu1.94S-ZnS nanoheterostructures

Xueyi Guo; Sheng Liu; Weijia Wang; Chongyao Li; Ying Yang; Qinghua Tian; Yong Liu

doi:10.1039/d1na00037c

Plasmon-induced ultrafast charge transfer in single-particulate Cu_1.94S-ZnS nanoheterostructures

Nanoscale Adv. 2021 Mar 23;3(12):3481-3490. doi: 10.1039/d1na00037c. eCollection 2021 Jun 15.

Authors

Xueyi Guo^{1

2}, Sheng Liu^{1

2}, Weijia Wang^{3

2}, Chongyao Li^{1

2}, Ying Yang^{1

2}, Qinghua Tian^{1

2}, Yong Liu^{3

2}

Affiliations

¹ School of Metallurgy and Environment, Central South University Changsha 410083 China.
² Research Institute of Resource Recycling, Central South University Changsha 410083 China.
³ State Key Laboratory for Powder Metallurgy, Powder Metallurgy Research Institute, Central South University Changsha 410083 China wangweijia@csu.edu.cn.

Abstract

Recombination centers generated from structural and interfacial defects in nanoheterostructures (NHs) prevent effective photo-induced charge transfer and have blocked the advance of many photoresponsive applications. Strategies to construct high-quality interfaces in NHs are emerging but are limited in the release of interfacial strain and the integrality of the sublattice. Herein, we synthesize single-particulate Cu_1.94S-ZnS NHs with a continuous sublattice using a nanoscale cation exchange reaction (CE). Under near-infrared (NIR) radiation (λ = 1500 nm), femtosecond open-aperture (OA) Z-scan measurements are applied to investigate the nonlinear optical features of samples and verify the existence of plasma-induced charge transfer in the Cu_1.94S-ZnS NHs system. The resulting charge transfer time (τ _CT) of ∼0.091 picoseconds (ps) was confirmed by the femtosecond time-resolved pump-probe technique. Such an ultrafast charge transfer process has been rarely reported in semiconductor-semiconductor NHs. The results suggest that CE can be used as a promising tool to construct well-ordered interfacial structures, which are significant for the performance enhancement of NHs for photon utilization.