Related Experiment Video
Updated: Apr 15, 2026
09:37
Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
10.3K
Ordered and reversible hydrogenation of silicene
Jinglan Qiu1, Huixia Fu1, Yang Xu1,2
1Institute of Physics, Chinese Academy of Science, Beijing 100190, China.
Physical Review Letters
|April 11, 2015
Summary
Hydrogenation of silicene on silver surfaces creates an ordered structure. This reversible process allows for tunable properties and potential hydrogen storage applications.
Area of Science:
- Surface Science
- Materials Science
- Nanotechnology
Background:
- Silicene, a silicon allotrope, exhibits unique electronic properties.
- Controlling silicene's structure is key to harnessing its potential.
- Hydrogenation is a method to modify 2D material properties.
Purpose of the Study:
- To investigate the hydrogenation of silicene on a silver(111) surface.
- To understand the resulting structural changes and reversibility.
- To explore potential applications in material property tuning and hydrogen storage.
Main Methods:
- Scanning Tunneling Microscopy (STM) for atomic-level surface imaging.
- Density Functional Theory (DFT) calculations for theoretical modeling.
- Controlled annealing for studying dehydrogenation processes.
Main Results:
- Room temperature hydrogenation yields a well-ordered gamma-(3x3) silicene superstructure.
- A theoretical model with seven hydrogen atoms and silicon atom buckling accurately explains the experimental observations.
- Annealing at 450 K leads to complete dehydrogenation and recovery of the clean silicene surface.
Conclusions:
- Uniformly ordered and reversible hydrogenation of silicene is achievable.
- This process offers a pathway for tuning silicene's electronic and physical properties.
- The reversible hydrogenation demonstrates potential for controllable hydrogen storage applications.
Related Concept Videos
02:13Reduction of Alkenes: Catalytic Hydrogenation
15.1K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
15.1K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
4.1K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
4.1K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.6K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
9.6K
01:28Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
6.6K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
6.6K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
13.7K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
13.7K
02:26Preparation and Reactions of Sulfides
6.0K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
6.0K