Electrospining Machine: Flexible Capacitive Pressure Sensor Basedon Laser-nduced Graphene andPolydimethylsiloxane Foam

On May 15, 2021, the team of Professor Huang Lixiong/Wang Han published the latest research paper in the "IEEE SENSORS JOURNAL" (impact factor: 16.6), titled "Flexible Capacitive Pressure Sensor Based on Laser-Induced Graphene and Polydimethylsiloxane Foam". They have made significant progress in the field of flexible capacitive pressure sensors based on laser-induced graphene and polydimethylsiloxane foam. 

Characterization method

1. Characterize the morphology of LIG and determine the thickness of the LIG layer: Scanning Electron Microscope (SEM, TM3030, Hitachi, Japan)

2. Further characterize the atomic structure of LIG: Raman spectrometer (633 nm laser, LabRAM HR Evolution, HORIBA Jobin Yvon, Palaiseau, France), X-ray photoelectron spectrometer

3. Characterize the porous structure of PDMS foam: Dual-source X-ray 3D microscope (NanoVoxel 3000D, Sanying, Tianjin, China)

4. Test the response of FCPS: Material testing machine (CMT2000, SUST, Zhuhai, China) generates mechanical stimuli to test its response

5. LCR meter monitors the resistance or capacitance changes of FCPS and its array in real-time

6. 2D contour maps and 3D bar graphs: Represent the region of pressure concentration and spatial pressure distribution maps

Research highlights

Integrated Structure FCPS: 

Developed an FCPS based on LIG and PDMS foam with a plate-foam-plate integrated structure, eliminating the need for lamination processes.

(LIG was prepared by directly writing on PI Nanofiber Membrane with a laser wavelength of 10.6μm. CAM and PDMS were mixed together, and the mixture was poured into a mold containing two LIG/PI samples. The uncured PDMS was allowed to fully penetrate the 3D network of LIG under -0.08 MPa for 1 hour. After the PDMS cured, the PI Nanofiber Membrane was removed from the LIG/CAM/PDMS composite. The LIG/CAM/PDMS composite was immersed in sufficient ethanol and then stirred in an ultrasonic cleaner to remove CAM. Through this process, an FCPS with a plate-foam-plate integrated structure was prepared.) Can distinguish different mechanical stimuli: Under different external mechanical stimuli, the FCPS exhibits four different response patterns, corresponding to stretching, squeezing, bending, and twisting, respectively. The FCPS can distinguish different external mechanical stimuli through multiple responses, thus avoiding signal conflicts.

Can distinguish different mechanical stimuli:

Under different external mechanical stimuli, the FCPS exhibits four different response patterns, corresponding to stretching, squeezing, bending, and twisting, respectively. The FCPS can distinguish different external mechanical stimuli through multiple responses, thus avoiding signal conflicts.

Link：Flexible Capacitive Pressure Sensor Based on Laser–Induced Graphene and Polydimethylsiloxane Foam | IEEE Journals & Magazine | IEEE Xplore