Performance Improvement by Ozone Treatment of 2D PdSe2.
Qijie LiangQian ZhangJian GouTingting SongArramel ArramelHao ChenMing LinSharon Xiaodai LimQixing WangRui ZhuNikolai YakovlevSwee Ching TanWenjing ZhangKostya S NovoselovAndrew Thye Shen WeePublished in: ACS nano (2020)
Atomic-scale defects in two-dimensional transition metal dichalcogenides (TMDs) often dominate their physical and chemical properties. Introducing defects in a controllable manner can tailor properties of TMDs. For example, chalcogen atom defects in TMDs were reported to trigger phase transition, induce ferromagnetism, and drive superconductivity. However, reported strategies to induce chalcogen atom defects including postgrowth annealing, laser irradiation, or plasma usually require high temperature (such as 500 °C) or cause unwanted structural damage. Here, we demonstrate low-temperature (60 °C) partial surface oxidation in 2D PdSe2 with low disorder and good stability. The combination of scanning tunneling microscopy, X-ray photoelectron spectroscopy, and density functional theory calculations provide evidence of atomic-scale partial oxidation with both atomic resolution and chemical sensitivity. We also experimentally demonstrate that this controllable oxygen incorporation effectively tailors the electronic, optoelectronic, and catalytic activity of PdSe2. This work provides a pathway toward fine-tuning the physical and chemical properties of 2D TMDs and their applications in nanoelectronics, optoelectronics, and electrocatalysis.
Keyphrases
- density functional theory
- molecular dynamics
- high resolution
- electron microscopy
- single molecule
- hydrogen peroxide
- high temperature
- transition metal
- physical activity
- mental health
- electron transfer
- room temperature
- oxidative stress
- high speed
- magnetic resonance imaging
- air pollution
- high throughput
- particulate matter
- radiation therapy
- molecular dynamics simulations
- magnetic resonance
- mass spectrometry
- nitric oxide
- dual energy
- optical coherence tomography
- ionic liquid