Optically Induced Switching of Azobenzene Containing Self Assembling Monolayers Investigated by Kelvin Probe and Scanning Force Microscopy
摘要:
The light induced switching of self-assembled monolayers containing azobenzenes is observed in situ by the Kelvin probe method. The switching process is optimized by preparing monolayers from mixed solutions of azobenzene thiols and n- alkylene thiols. In a film the efficiency of the E/Z-isomerization depends on both the spacer length between azobenzene group and gold surface as well as the free volume in the film, tuned by the n-alkylene thiol fraction in the mixture. An optimum was found in a mixed self-assembling film containing 33% 4-fluoromethyl-3'-(10-carboxy-decyloxy) azobenzene in a dodecane thiol matrix. The structure of the films were characterized by FTIR and AFM.
Optically Induced Switching of Azobenzene Containing Self Assembling Monolayers Investigated by Kelvin Probe and Scanning Force Microscopy
摘要:
The light induced switching of self-assembled monolayers containing azobenzenes is observed in situ by the Kelvin probe method. The switching process is optimized by preparing monolayers from mixed solutions of azobenzene thiols and n- alkylene thiols. In a film the efficiency of the E/Z-isomerization depends on both the spacer length between azobenzene group and gold surface as well as the free volume in the film, tuned by the n-alkylene thiol fraction in the mixture. An optimum was found in a mixed self-assembling film containing 33% 4-fluoromethyl-3'-(10-carboxy-decyloxy) azobenzene in a dodecane thiol matrix. The structure of the films were characterized by FTIR and AFM.
The light induced switching of self-assembled monolayers containing azobenzenes is observed in situ by the Kelvin probe method. The switching process is optimized by preparing monolayers from mixed solutions of azobenzene thiols and n- alkylene thiols. In a film the efficiency of the E/Z-isomerization depends on both the spacer length between azobenzene group and gold surface as well as the free volume in the film, tuned by the n-alkylene thiol fraction in the mixture. An optimum was found in a mixed self-assembling film containing 33% 4-fluoromethyl-3'-(10-carboxy-decyloxy) azobenzene in a dodecane thiol matrix. The structure of the films were characterized by FTIR and AFM.