▎ 摘　　要

This study reports the characterization and gas sensing applications of graphene by using UV-visible spectroscopy, Quartz Crystal Microbalance (QCM) and Langmuir-Blodgett (LB) thin film deposition techniques. The graphene LB thin films are characterized by using UV-visible spectroscopy and QCM system. The transfer ratio values are found to be over 0.95 for quartz glass or quartz crystal substrates. The typical frequency shift per layer is obtained as 53.65 Hz/layer and the deposited mass onto quartz crystal is calculated as 988.02 ng/layer. The swelling behaviours of the graphene LB films are also investigated with respect to volatile organic compounds (VOCs) at room temperature by using the early-time Fick's law of diffusion. It is observed that the diffusion coefficients (D) for swelling obeyed the tin law and are correlated with the VOCs used. The diffusion coefficients are found to be 29.18 x 10(-16), 21.76 x 10(-16), 2.10 x 10(-16) and 1.49 x 10(-16) cm(2) s(-1) for dichloromethane, chloroform, benzene and carbontetrachloride, respectively. The response of the graphene films to the selected VOCs has been investigated in the conditions of the physical properties of the solvents, and the films are obtained to be largely sensitive to dichloromethane and chloroform vapors compared to the other studied vapors.