| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 101 === In order to improve the dispersibility of graphene, we functionalize the
graphite with oxidize agent by Hummer’s method .Due to the strong
hydrophilic property of Graphene Oxide(GO), we add cationic
surfactant(DDAB) to stabilize Graphene oxide at air/water interface. We study
the behavior of GO/DDAB mixed monolayer on the air/water interface by
using the pressure-area (π-A) isotherm. Then we transfer the GO/DDAB mix
monolayer Langmuir-Blodgett film onto the substrate, and obeserve film
surface morphology by TEM and AFM. In order to regain the film conductivity,
we expose the GO/DDAB mix Langmuir-Blodgett film under UV light to form
Reduce Graphene Oxide(rGO), then we observe the electrochemical property
of LB film by cyclic Voltammetry , electrochemical impedance sepectroscopy,
we also fabricate hydrogen peroxide sensor to get the sensor sensibility.
According to experiment results, by controlling the ratio of GO and
DDAB, well-dispersed GO thin film is fabricated. The edge plane structure
will increase while the film dispersibility is improved, which may improve the
film electrochemical property and sensing result. The sensor exhibits the
highest current sensitivity (0.269μA/cm2.M) and the lowest the slope of current
change (0.15μA/cm2.s).
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