Stress and interfacial/surface synergistically modulated charge transfer mechanism and nonlinear absorption properties in Ti3C2(-O)/MoS2 heterostructure

In this work, two design strategies and two-steps synthesis process based on the hydrothermal (HT)/HT and HT/magnetron sputtering (MS) were adopted to control the growth of Ti3C2(-O)/MoS2. The interlayer MoS2 interconnection in Ti3C2(-O) and vertical/lateral contact MoS2 modes were visualizing orientation-controlled for analyzing the interface properties and light-matter coupling effect. On the basis of the strain and interfacial/surface engineering synergistical modulation of the electron transfer mechanism, the electron excitation-relaxation of Ti3C2(-O)/MoS2 heterostructure was investigated. The studies have revealed a correlation between surface terminations and the nonlinear optical (NLO) properties in Ti3C2-(O), which supplied a general method to change the NLO response of emerging 2D materials by adjusting the heterostructure interface. The effects of interface effects on the synthesis of Ti3C2(-O)/MoS2 heterostructure, as well as the ultrafast nonlinear optical properties have been discussed. The charge transfer and orbital contribution of Ti3C2(-O)/MoS2 heterostructure were explained by density functional theory. Ti3C2(-O)/MoS2 heterostructure have been demonstrated with the unique for charge transfer pathways at photon-electron coupling. It provides a basic understanding of emerging heterostructure and reveals the potential prospects of such heterostructure in optoelectronic devices and energy environment field. [Display omitted] •Two design strategies were used to firstly synthesize Ti3C2-(O)/MoS2 heterostructure.•The stress and interfacial/surface synergistically modulated electron transfer mechanism and nonlinear absorption properties of Ti3C2-(O)/MoS2 were analyzed.•DFT investigated the charge transfer and orbital contribution of Ti3C2-(O)/MoS2 heterostructure.•The nonlinear absorption and transient absorption properties of Ti3C2-(O)/MoS2 heterostructure. Here, Ti3C2(-O)/MoS2 with two interface contacts were obtained by two-steps of hydrothermal (HT)/HT and HT/magnetron sputtering (MS) technique. The visualizing orientation-controlled interlayer interconnection and vertical/lateral contact modes for interface properties and light-matter coupling effect have been analyzed. The Raman spectra of Ti3C2(-O)/MoS2(HT) verified that the redshift of characteristic peak for Ti3C2(-O) was dominated by interfacial stress. The results of Ti3C2(-O)/MoS2(MS) revealed that the overall blue shift of the characteristic peak for Ti3C2(-O) and the redshift of th