Figure 51 The preparation process of blue-emitting reduced graphene oxide quantum dot (rGOQD)-based light emitting diodes (LEDs).[188]
Oxygen-containing functional groups of graphene oxide (GO), which destroy the path of electron movement, result in the conductivity of GO being far lower than that of graphene, which seriously restricts its application. Our group designed a kind of conductive patterned film with high resolution comprised of reduced graphene oxide (RGO) which prepared by the ultraviolet photolithography technique.[189] This work developed a strategy of introducing GO into the photocuring formula and used UV photolithography technology to create conductive patterned polymer films in one step with high efficiency. BAPO not only acts as a PI to promote the photopolymerization of films under UV irradiation but also serves as a reductant to reduce GO. The mechanism for reducing GO in the composites by a simple and efficient photoreduction method is shown in Figure 52. Consequently, the maximum conductivity of photoresist/RGO films is 9.90 S cm−1 when the GO content is 10.7 wt%, BAPO content is 3 times that of GO and the exposure time is 15 min. Furthermore, conductive micropatterns can be obtained on diverse substrates such as PET films, silicon wafers and glasses substrates by photolithography techniques with a high conductivity of 0.98 S cm−1, and the micropatterns demonstrate excellent flexibility and stability. This study suggests an approach to fabricate conductive polymer films and micropatterns with promising potential in the field of flexible electronic devices.