Showing papers by "Dong Wang published in 2003"
TL;DR: In this paper, the adsorption of enantiomers and a racemic mixture of tyrosine (tyr) on Cu(111) has been investigated by cyclic voltammetry and electrochemical scanning tunneling microscopy.
Abstract: The adsorption of enantiomers and a racemic mixture of tyrosine (tyr) on Cu(111) has been investigated by cyclic voltammetry and electrochemical scanning tunneling microscopy. D-tyr and L-tyr molecules adsorb on Cu(111) and show a (4 x 4) structure. The mirror symmetry between two adlayers is demonstrated by high-resolution scanning tunneling microscope images. The spontaneous separation of racemate into homochiral domains is observed. The result presented here is hoped to supply direct evidence for the chiral adlayer ordering at the solid/liquid interface.
18 citations
TL;DR: In-situ scanning tunneling microscopy (STM) and cyclic voltammetry have been employed to investigate conformation-related adlayer structures of four calixarenes, three calix[4]arenes with specific...
Abstract: In-situ scanning tunneling microscopy (STM) and cyclic voltammetry have been employed to investigate conformation-related adlayer structures of four calixarenes, three calix[4]arenes with specific ...
17 citations
TL;DR: In this paper, the adsorption of three amino acids, l-valine (Val), l-leucine (Leu), and l-phenylalanine (Phe), bearing different substituted groups was investigated on a Cu(111) electrode by in situ electrochemical scanning tunneling microscopy (ECSTM).
Abstract: The adsorption of three amino acids, l-valine (Val), l-leucine (Leu), and l-phenylalanine (Phe), bearing different substituted groups was investigated on a Cu(111) electrode by in situ electrochemical scanning tunneling microscopy (ECSTM). All three molecules are found to form well-ordered adlayers on the surface. Two stable adlayers of l-Val with the symmetry of (3 × 3) and (2 × √3) were found at the investigated potential range, while l-Leu and l-Phe form similar (4 × 4) adlayer structures. With high-resolution STM images, the internal structural information of adlayers was obtained and the structural models for the three adlayers were proposed.
17 citations
TL;DR: In this article, a review of the development of electrochemical scanning tunneling microscopy (STM) was briefly reviewed and the progress of the study on the adsorption of aromatic compounds and their derivations on electrode surface was introduced.
Abstract: The adsorption of aromatic molecules at solid/liquid interface represents one important topic in surface science because of its close relationship with the surface catalysis, molecular-based nanostructure and nanodevices, and other surface physical chemistry phenomena. With the high-resolution images of molecular adlayer obtained by electrochemical scanning tunneling microscopy (STM), the abundant information about the adsorption structure and dynamics of aromatic molecules on electrode surfaces was obtained. The results are important to the understanding of the intermolecular and molecular-substrate interactions which govern the formation of adlayers. In the present review, the development of electrochemical STM was briefly reviewed and the progress of the study on the adsorption of aromatic compounds and their derivations on electrode surface was introduced. In particular, the attention is paid on the adsorption of hetero-cyclic aromatic compounds and other derivatives to elucidate the interaction of different functional groups with the substrate and the effect of molecule symmetry, electronic structure on the adsorption process.