Manufacturing of direct exfoliation graphene-based transparent conducting Langmuir - Blodgett films
In the present study a process for manufacturing graphene-based transparent conducting ilms, whereas graphene is obtained via ultrasonic-assisted liquid-phase exfoliation of natural graphite. The use of Langmuir - Blodgett technique is irst reported to be utilized for the formation of directly exfoliated graphene-based thin conducting ilms deposited on dielectric substrates (glass, lithium niobate). It is shown that centrifugation of graphene suspensions before ilm deposition leads to the formation of highly transparent conducting ilms. Crucial properties of the ilms (surface resistance, optical transparency) were investigated; it was shown that achieved level of properties (surface resistance 143 Ω/□ at optical transparency ~ 90 % and weak dependence on the wavelength) make these ilms attractive as transparent electrodes for photovoltaics, light emitting diodes, and prospective sensor technologies. Samples of graphene-based ilms deposited onto transparent piezoelectric substrate (lithium niobate) showed promise as transparent electrodes for piezosensors and actuators for electronics and sensorics as a possible substitute for indium-tin oxide-based ceramics.