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.