Graphene electronic tattoo (GET)Sensors

GET is an ultra thin and ultra soft electronics made of a single to  few  layers of carbon atoms, know as graphene. The GET overall  thickness is less than 500 nm. This electronic tattoo sensors are fabricated using a time and cost effective method, and it can be transferred on  the skin  just like as temporary tattoo. The video shows the chemical free lamination of  GET on the skin, just by applying water on the  backside of tattoo paper.

We demonstrated the application of the GET for  recording  electrophysiological signals such as electroencephalography  (EEG), electrocardiography (ECG), Electromyography (EMG), electrooculography (EOG), sensing skin temperature and  hydration level, human machine interface and internet of things  (IoTs). 

Deformation of Graphene Electronic Tattoo (GET) sensors on skin  

Due to ultra-thinness and ultra-softness of the GET, It forms conformal contact to the microscopic features of skin. There is no need of adhesive or tape  to keep the GET on skin. The main mechanism of adhesion of GET is van der Waals force. 

The video shows the deformation of GET on skin. GET stays attached to the skin even during large skin deformations. 

Application of Graphene Electronic    Tattoo (GET) in Internet of things   

Video shows the demonstration of GET application in IoTs. The  electrical signals from heart (electrocardiography) are recorded using GET   and sent wirelessly to  a tablet. These recorded signals then can be sent to a medical center through internet, if it is required. GET  is not  susceptible to motions as it form conformal contact to skin and does not move with respect to skin.   

GET & Human-machine interfaces 

Video shows the demonstration of GET application in human-machine interfaces. GET sensors laminated on the skin around eyes capture the electrical potentials of retina and cornea during eye movements. The recorded signals from eyes (electrooculography) is then used to control the movements of a quadcopter in real time. 

Video shows that when the subject looks upward quadcopter move up, when he looks downward quadcopter move down and similarly it moves to the right and left with looking towards the corresponding directions. 

three dimensional graphene as a scaffold for growth of HL-1 cell line

HL-1 cells, are derived from mouse atrial tumor. These cells are contractile after they form a confluent layer. Our study shows that 3D graphene can be used as a scaffold for growth and real-time electrical recording of  HL-1 cell line contractions. Video shows the beating of HL-1 cells grown on 3D graphene. 

In the presence of  non-uniform AC electric field , dielectric particles experience either attraction or repulsion force toward or from the maxima of electric field. Dielectric force depends on electric field strength, particle radius, the dielectric constant of particle and the dielectric constant of background media.

Photos shows microwell arrays with the different percentages of  wells filled with cells. The bottom right photo shows the wells after cells lysis by applying DC field. 

Dieletrophoretic Cell trapping and cell lysis in microwell arrays