Publication date: 28th June 2024
Inkjet printing technology has emerged as a promising tool for fabricating bioelectronic devices, offering scalability and accessibility in device manufacturing processes. In this study, we explore the application of inkjet-printed Nafion-gated graphene field-effect transistors (NF-GFETs) for bioelectronics applications. With the exceptional conductivity and biocompatibility of Nafion, NF-GFETs serve as ion-to-electron transducers, enabling precise control over electronic signals and ion transport. We extend our investigation to encompass varying relative humidity levels, mirroring biological conditions, and demonstrate enhanced device performance under humid environments. Inkjet printed Nafion gate exhibits much more gate response compared to the back gate thanks to the large capacitance of the Nafion gate dielectrics. To be more specific, the transconductance of transistors using the Nafion gate is approximately 20 times higher than that of the back gate. The performance of Nafion-gated graphene transistors operating at different RH conditions is compared to vacuum conditions. The results show that under vacuum conditions, the gate response is ineffective. In addition, we can see the shift of the Dirac point to the negative gate voltage direction and reduced hysteresis with increasing RH levels. We then perform the fast measurements (Id response at different frequencies with an applied square waved gate voltage) to simulate physiological signals. Initial tests, conducted with spin-coated Nafion graphene transistors due to equipment limitations, show a good square-wave fidelity up to 100 Hz. We are currently optimizing the device geometry of inkjet-printed Nafion graphene transistors for similar fast measurements.
Acknowledgement: Ky Van Nguyen acknowledges the funding support from a Brain Pool fellowship from the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. 2022H1D3A2A02063358).
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.