Modulating Electronic Properties of Monolayer MoS₂ via Electron-Withdrawing Functional Groups of Graphene Oxide

Abstract

Modulation of the carrier concentration and electronic type of monolayer (1L) MoS is highly important for applications in logic circuits, solar cells, and light-emitting diodes. Here, we demonstrate the tuning of the electronic properties of large-area 1L-MoS using graphene oxide (GO). GO sheets are well-known as hole injection layers since they contain electron-withdrawing groups such as carboxyl, hydroxyl, and epoxy. The optical and electronic properties of GO-treated 1L-MoS are dramatically changed. The photoluminescence intensity of GO-treated 1L-MoS is increases by more than 470% compared to the pristine sample because of the increase in neutral exciton contribution. In addition, the A peak in Raman spectra shifts considerably, revealing that GO treatment led to the formation of p-type doped 1L-MoS. Moreover, the current vs voltage (I-V) curves of GO-coated 1L-MoS field effect transistors show that the electron concentration of 1L-MoS is significantly lower in comparison with pristine 1L-MoS. Current rectification is also observed from the I-V curve of the lateral diode structure with 1L-MoS and 1L-MoS/GO, indicating that the electronic structure of MoS is significantly modulated by the electron-withdrawing functional group of GO.

Optical and Electrical Enhancement of Hydrogen Evolution by MoS2@MoO3 Core–Shell Nanowires with Designed Tunable Plasmon Resonance

“…The most efficient transfer of charge carriers of the MoS 2 @MoO 3 ‐H 2 ‐3h sample is further verified by PL analysis, which is often used to study surface processes involving photoexcited energy and electron transfer and recombination. As shown in Figure f, obvious emission peaks are observed at 670 and 446 nm, consistent with the MoS 2 and MoO 3 data in literature . Interestingly, after the hydrogenation process, the intensity of the peak at 670 nm is suppressed because of improved photoinduced electron transfer ability from the improved conductivity of MoO 3 after doping.…”

Recent Advances in Metal‐Organic Frameworks and Their Derived Materials for Electrocatalytic Water Splitting

“…These exposed surfaces can be modified to possess better the catalytic activity. Moreover, the electronic structure of TMDCs can be optimized by constructing defect, doping or introducing functional groups to obtain more suitable adsorption energy of reaction intermediates, which mean better electrocatalytic activity. MoS 2 is a promising HER electrocatalyst.…”

Surface group-modified MXene nano-flake doping of monolayer tungsten disulfides

“…The decreased PL enhancement of 1L WS 2 /N-Ti 3 C 2 T x could be attributed to the decreased charge transfer from 1L WS 2 to N-Ti 3 C 2 T x owing to the elimination of a strong electronwithdrawing functional group of F and adsorbed H 2 O. 17,45…”