Research Output per year
In this work, we show our recent research on e-skin (Figure 1) addressing above challenges through the development of a nanowire (NW) based neural field effect transistor (nu-NWFET) as a basic building block for neural-mimicking data processing (Figure 1(a)) and an energy-autonomous e-skin achieved by integrating graphene based transparent touch sensors to photovoltaic cells (Figure 1(d)). The heterogeneous integration of various materials led to achieving such functionalities. Nanomaterials such as graphene and Si NWs are considered as good candidates for flexible electronics due to their excellent mechanical flexibility, printability in large-area as well as outstanding electrical performance. Here, we present a low-cost method to transfer and pattern single layer graphene on large-area flexible and transparent substrates, resulting in a co-planar interdigitated capacitive structure. In terms of the sensing performance, our sensors can detect minimum pressures down to 0.11 kPa with a uniform sensitivity of 4.3 Pa-1 along a broad pressure range. Thanks to the transparency of graphene, the integration of touch sensors atop a photovoltaic cell is possible, which paves a new way for energy-autonomous, flexible, and tactile e-skin (Figure 1(d)).
Using nu-NWFET to realize hardware neural network is an interesting approach as by printing NWs on large area flexible substrates it will be possible to develop a flexible tactile e-skin with distributed neural elements (for local data processing, as in biological skin) in the backplane. Given the previously demonstrated metalassisted chemical etching NW synthesis method and contact printing for large-area assembling of NWs, the nu-NWFET presented here is promising for large-area and low-cost flexible electronics. Modeling, simulation and fabrication of nu-NWFET shows that the overlapping areas between individual gates and the floating gate determines the initial synaptic weights of the neural network. Further, proof-of-concept is shown by interfacing it with a transparent tactile e-skin prototype integrated on the palm of a 3D printed robotic hand and performing coding of touch gesture.
The research finds place in numerous futuristic applications such as prosthetics, robotics and electroceuticals, and this presentation will show the interesting progress made in this direction.
|Publication status||Published - 23 Jan 2018|
|Event||4th Annual Innovations in Large Area Electronics Conference - Wellcome Genome Campus Conference Centre, Cambridge, United Kingdom|
Duration: 23 Jan 2018 → 24 Jan 2018
|Conference||4th Annual Innovations in Large Area Electronics Conference|
|Abbreviated title||innoLAE 2018|
|Period||23/01/18 → 24/01/18|
Research output: Contribution to journal › Review article
Research output: Chapter in Book/Report/Conference proceeding › Conference contribution