As mentioned above, the hybridization of 2D materials
with other functional species has led to the enhanced
performance in various applications. As a
proof-of-concept demonstration, the electronic property
and switching effect of MoS2@ZIF-8 based flexible
memory device with the configuration of poly-
(ethylene terephthalate) (PET)/rGO/MoS2@ZIF-8/rGO
was investigated by currentvoltage (IV) characteristics
(see Methods and Materials for the detailed fabrication
process of the device). As shown in Figure 4a,
the MoS2@ZIF-8 based device exhibited bistable electrical
behavior. Starting with the low conductivity state
(OFF state) in the device, the current state increased
abruptly from 7.0 1010 to 5.0 105 A with the
applied negative voltage increased to þ3.3 V, indicating
that the electrical property transformed to a high
current state (ON state). The transition from the OFF
state to the ON state serves as the “writing” process. In
the subsequent positive sweep (stage 2), the device