װ ȭа ΰ

Content on this page requires a newer version of Adobe Flash Player.

Get Adobe Flash player

 
ۼ : 17-11-08 15:32
[2017.11] Interface-Confined Doubly Anisotropic Oxidation of Two-Dimensional MoS2
-
 ۾ :
ȸ : 265  

Interface-Confined Doubly Anisotropic Oxidation of Two-Dimensional MoS2



Yejin Ryu, Wontaek Kim, Seonghyun Koo, Haneul Kang, Kenji Watanabe, Takashi Taniguchi, and Sunmin Ryu*



Despite their importance, chemical reactions confined in a low dimensional space are elusive and experimentally intractable. In this work, we report doubly anisotropic, in-plane and out-of-plane, oxidation reactions of two-dimensional crystals, by resolving interface-confined thermal oxidation of a single and multilayer MoS2 supported on silica substrates from their conventional surface reaction. Using optical second-harmonic generation spectroscopy of artificially stacked multilayers, we directly proved that crystallographically oriented triangular oxides (TOs) were formed in the bottommost layer while triangular etch pits (TEs) were generated in the topmost layer and that both structures were terminated with zigzag edges. The formation of the Mo oxide layer at the interface demonstrates that O2 diffuses efficiently through the van der Waals (vdW) gap but not MoO3, which would otherwise sublime. The fact that TOs are several times larger than TEs indicates that oxidation is greatly enhanced when MoS2 is in direct contact with silica substrates, which suggests a catalytic effect. This study indicates that the vdW-bonded interfaces are essentially open to mass transport and can serve as a model system for investigating chemistry in low dimensional spaces.


ǥ ȭ ϴ Ǵ Ӹ ƴ϶ پ ؼ ʼ ̴. б AFM imaging ̿Ͽ ݵü MoS2 ȭ Ͽ. Optical second-harmonic generation (SHG) б ̿ ⿡ Ÿ ӵ 漺 ʷ ߰Ͽ. ̸ ϱ SiO2 ǰ ȣۿ Ͽ, ˷ Ͱ ޸ ڵ van der Waals Ȱϰ Ȯ Ͽ. 2017 10 30 Nano Letters Ǿ.


 
 

Total 78
ȣ     ۾ ¥ ȸ
78 [2017.11] ܹ ȣۿ 11-29 173
77 [2017.11] Triazenyl Radicals Stabilized by N-Heterocyclic Carbenes 11-21 230
76 [2017.11] Interface-Confined Doubly Anisotropic Oxidation of Two-Dimensional MoS2 11-08 266
75 [2017.11] Structural and Optical Properties of Single- and Few-Layer Magnetic Semiconductor CrPS4 11-01 269
74 [2017.10] Therapeutic gas responsive hydrogel 10-16 207
73 [2017.08] 輺 Light-Induced Fluorescence Modulation of Quantum Dot-Crystal Violet Conjugates: Stochastic Off–On–Off Cycles for Multicolor Patterning and Super-Resolution 08-29 340
72 [2017.07]ȯ Diastereo- and Enantioselective Synthesis of -Aminoboronate Esters by Copper(I)-Catalyzed 1,2-Addition of 1,1-Bis[(pinacolato)boryl]alkanes to Imines 07-20 425
71 [2017.06]ڹ Tattooing Dye as a Green Electrode Material for Lithium Batteries 07-03 414
70 [2017.04]輺 Cancer-Microenvironment-Sensitive Activatable Quantum Dot Probe in the Second Near-Infrared Window 04-20 701
69 [2017.01]ȯ Chemoselective Coupling of 1,1-Bis[(pinacolato)boryl]alkanes for the Transition-Metal-Free Borylation of Aryl and Vinyl Halides: A Combined Experimental and Theoretical Invesitigation 01-02 1269
68 [2016.11]ڹ 1 Volt-Driven Superfast Polymer Actuators Based on Single Ion Conductors 11-16 1197
67 [2016.09]α Ultrathin and Flat Layer Black Phosphorus Fabricated by Reactive Oxygen and Water Rinse 09-22 1165
66 [2016.08]ö Unique Crystallization of Fullerenes: Fullerene Flowers 08-30 716
65 [2016.08]ö Nanocomb Architecture Design Using Germanium Selenide as High Performance Lithium Storage Material 08-29 1016
64 [2016.08]ؿ Visualization and Quantification of MicroRNA in a Single Cell Using Atomic Force Microscopy 08-17 940
 1  2  3  4  5  6  

Content on this page requires a newer version of Adobe Flash Player.

Get Adobe Flash player