Applications
in the field of portable and wearable electronics
are becoming multifunctional, and the achievement of transparent electronics
extensively expands the applications into devices such as wearable
flexible displays or skin-attachable mobile computers. Moreover, the
self-charging power system (SCPS) is the core technique for realizing
portable and wearable electronics. Here, we propose a transparent
and flexible multifunctional electronic system in which both an all-in-one
SCPS and a touch sensor are combined. A single-layer graphene (SLG)
film was adapted as an electrode for the supercapacitor, touch sensor,
and a triboelectric nanogenerator (TENG), thus making an electronic
system that is ultrathin, lightweight, transparent, and flexible.
Capacitive-type transparent and flexible electronic devices can be
simultaneously used as an electrochemical double-layer capacitance-based
supercapacitor and as a sensitive, fast-responding touch sensor in
a single-device architecture by inserting a separator of polyvinyl
alcohol–lithium chloride-soaked polyacrylonitrile electrospun
mat on polyethylene naphthalate between two symmetric SLG film electrodes.
Furthermore, a transparent all-in-one SCPS was fabricated by laminating
a TENG device with a supercapacitor, and high-performance electric
power generation/storage capability is demonstrated.
We report the effect of the interfacial conductivity on the e-beam-induced crystallization of an oxide a-LaAlO3thin film on the SrTiO3substrate and the kinetics can be controlled by the electrical conductivity of the interface and the dose rate.
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