2,3,5,6-Tetrachloride-quinone was anchored to a gold surfare through the self-assem-bled monolayers of dithiol [DT HS-(CH2).-SH n=2,4,6,8,10]. The surface coverage of the anchoredTQ was esteminated to be 4.0 ×10-...2,3,5,6-Tetrachloride-quinone was anchored to a gold surfare through the self-assem-bled monolayers of dithiol [DT HS-(CH2).-SH n=2,4,6,8,10]. The surface coverage of the anchoredTQ was esteminated to be 4.0 ×10-11 mol’cm-2. The electron transfer rate constant Ket associatedwith the redox process of anchored film decreased from 6.75 s-1 at n=2 to 0.169 s-1 at n=10 withincreasing the chain length of the DT SAMs througth the redox potential of TQ. The turnningbarrier conefficient.(β) of the electron transfer was estimated to be 0.82A-1 from the observed linearrelationship between the Ket and the monolayer chain length.展开更多
AFM was employed for fabricating positive organic pattern on gold surface. In this procedure, 1-octadecanethiol was adsorbed onto AFM tip firstly and then transported to gold surface during the scanning process. The t...AFM was employed for fabricating positive organic pattern on gold surface. In this procedure, 1-octadecanethiol was adsorbed onto AFM tip firstly and then transported to gold surface during the scanning process. The transported molecules could spontaneously adsorbed onto gold surface to form a monolayer. The selective transport was controlled by the scanning parameter, such as scanning speed and tip-substrate interaction. It was found that the relative humidity plays very important roles on the deposition process, the higher the humidity, the higher the possibility that deposition happens. The dependence of deposition on the humidity suggests that the 1-octadecanethiol molecule is transported through the water layer on the gold surface. Meanwhile, the optimal deposition condition also depends on the characteristics of AFM tip.展开更多
文摘2,3,5,6-Tetrachloride-quinone was anchored to a gold surfare through the self-assem-bled monolayers of dithiol [DT HS-(CH2).-SH n=2,4,6,8,10]. The surface coverage of the anchoredTQ was esteminated to be 4.0 ×10-11 mol’cm-2. The electron transfer rate constant Ket associatedwith the redox process of anchored film decreased from 6.75 s-1 at n=2 to 0.169 s-1 at n=10 withincreasing the chain length of the DT SAMs througth the redox potential of TQ. The turnningbarrier conefficient.(β) of the electron transfer was estimated to be 0.82A-1 from the observed linearrelationship between the Ket and the monolayer chain length.
文摘AFM was employed for fabricating positive organic pattern on gold surface. In this procedure, 1-octadecanethiol was adsorbed onto AFM tip firstly and then transported to gold surface during the scanning process. The transported molecules could spontaneously adsorbed onto gold surface to form a monolayer. The selective transport was controlled by the scanning parameter, such as scanning speed and tip-substrate interaction. It was found that the relative humidity plays very important roles on the deposition process, the higher the humidity, the higher the possibility that deposition happens. The dependence of deposition on the humidity suggests that the 1-octadecanethiol molecule is transported through the water layer on the gold surface. Meanwhile, the optimal deposition condition also depends on the characteristics of AFM tip.
