A carregar...
Publicação
Laser induced electrodes towards low cost flexible electronics and its applications in a UV sensor
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 20.93 MB | Adobe PDF |
Autores
Orientador(es)
Resumo(s)
Flexible electronics is a branch of electric fabrication that allows increasingly smaller and
ergonomic devices. However, its production is still a multi-step process, expensive and
time consuming.
Laser direct writing (LDW) is a clean and low cost alternative technique to produce
electrodes on flexible substrates that allows high resolution, without the need of masks
or direct contact of the system with the device. Moreover, to produce graphene based
flexible devices is required the use of expensive techniques, controlled environments and
long production times. Laser induced graphene (LIG) emerges thus as a rising substitute
to produce such devices. LIG has as an essential feature the CO2 infrared laser locally
irradiation of polyimide (PI) or polyetherimide (PEI) films where the product is mainly
graphene stacked structures.
This work consisted in the development and optimization of flexible UV sensors that
uses zinc oxide nanorods as the active layer for the detection, PI or PEI as the substrates
and its respective LIG as electrodes. The nanorods with higher area-volume ratio, synthesized
through a microwave assisted hydrothermal method, were selected and deposited
by drop casting onto the electrodes that in turn were optimized to enhance electrical
properties by varying the laser parameters.
The assembled sensors were able to successfully detect the UV radiation with a responsivity
of 92 and 2 nA/W for 1 V bias for the PI and PEI substrates, respectively. In
addition the PI sensor shown to be capable of working under strain and to be stable after
several hours of constant operation.
Moreover to complement the LDW study it was produced laser induced silver and
copper electrodes on paper subtracts with promising but still preliminary outcomes.
Descrição
Palavras-chave
Laser direct writing Laser induced graphene Graphene stacked structures Zinc oxide nanorods UV sensor flexible electronics