Interfacial supramolecular self-assembled monolayers of C-60 by thiolated beta-cyclodextrin on gold surfaces via monoanionic C-60
Data(s) |
2007
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Resumo |
The supramolecular self-assembled monolayers (SAMs) of C-60 by thiolated beta-cyclodextrin (CD) on gold surfaces were constructed for the first time using C-60 monoanion. The results indicate that monoanionic C-60 plays a crucial role in the formation of the C-60-containing self-assembled monolayers. The generation of C-60 monoanion and the formation process of C-60 SAMs were monitored in-situ by UV-visible and near-IR spectroscopy. The resulting C-60 SAMs were fully characterized by spectroscopic ellipsometry (SE), cyclic voltammetry, X-ray photoelectron spectroscopy (XPS), and water contact angle measurements. After the immobilization of C-60 by the SAMs of thiolated beta-CD, the film thickness increased by approximately 1 nm from 0.8 to 1.8 nm as determined by SE, demonstrating the formation of the supramolecular self-assembled monolayers of thiolated beta-CD/C-60. The new C-60 SAMs exhibited one quasi-reversible redox couple at half wave potential of -0.57 V vs SCE in aqueous solution containing 0.1 M KCl. The surface coverage of C-60 on the gold surfaces was estimated to be 1.1 x 10(-10) mol cm(-2). The XPS showed the assembly of C-60 over the thiolated beta-CD SAMs. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Liu W;Zhang Y;Gao X.Interfacial supramolecular self-assembled monolayers of C-60 by thiolated beta-cyclodextrin on gold surfaces via monoanionic C-60,JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2007 ,129(16):4973-4980 |
Palavras-Chave | #EFFICIENT PHOTOCURRENT GENERATION #PHOTOINDUCED ELECTRON-TRANSFER #DONOR-ACCEPTOR HETEROJUNCTIONS #QUARTZ-CRYSTAL MICROBALANCE #HOST-GUEST INTERACTIONS #GAMMA-CYCLODEXTRIN #CHARGE-TRANSFER #THIN-FILMS #NONCOVALENT IMMOBILIZATION #2ND-HARMONIC GENERATION |
Tipo |
期刊论文 |