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SUMMARY:Inflight printing of micro/nano fibres: from harvesting acoustic e
 nergy to detecting cell movement - Andy Wenyu Wang\, CUED
DTSTART:20210430T133000Z
DTEND:20210430T140000Z
UID:TALK155026@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Micro/nano fibres usually have high aspect ratio\, low bending
  stiffness and high transparency at an individual string level\; these uni
 que physical properties intrinsically endow micro/nano fibre textiles with
  favourable performances at a macroscale level\, such as flexibility\, per
 meability and transparency. The idea to synthesis micro/nano fibres with e
 lectronic-functional materials and efficiently assemble them into fibre-ba
 sed devices and architectures has opened up new possibilities ranging from
  transparent textile-based sensors to biointerfacing electronics. However\
 , current fibre fabrication approaches do not readily allow efficient elec
 tronic-functional micro/nano fibre printing leading to fibre-based device 
 integration.\nHerein\, I present two original micro/nano fibre printing te
 chniques\, which are especially developed to efficiently print substrate-f
 ree electronic-functional fibres with various fibre designs and applicatio
 ns. First\, the inflight fibre printing\, which integrates conducting fibr
 e production and fibre-to-circuit connection in a single step\, is develop
 ed to produce metallic (silver) or organic (PEDOT:PSS) fibres with 1-3 μm
  diameter. Using PEDOT:PSS fibres as a cell-interfaced impedimetric sensor
  and a moisture sensor\, I demonstrate that even a single fibre component 
 can achieve complex functions or outperform conventional film-based device
 s. The capability to design suspended fibres and networks of homo-\, heter
 o- cross-junctions\, paves the way to applications including flow-permissi
 ve devices\, and 3D optoelectronic and sensor architectures. Second\, dyna
 mic near‐field electrospinning is developed to fabricate in-situ poled p
 iezoelectric nanofiber mesh\, with high visible light transparency (> 97%)
  and air permissiveness. Such suspended nanofibre mesh harnesses the physi
 cal merits of spider web in its high acoustic sensing ability and broad ac
 tive bandwidth. Combined with piezoelectric polymers\, such spider-web ins
 pired acoustic sensor has a broad sensitivity bandwidth covering 200–500
 0 Hz at hearing‐safe sound pressure levels. Overall\, I demonstrate the 
 versatility and scalability of fibre printing methods that could pave way 
 for the next-generation fibre-based devices.
LOCATION:Zoom Meeting ID: 867 5602 4340
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